text: /* linux/drivers/media/platform/s5p-jpeg/jpeg-core.c
   *
   * Copyright (c) 2011-2014 Samsung Electronics Co., Ltd.
   *		http://www.samsung.com
   *
   * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
   * Author: Jacek Anaszewski <j.anaszewski@samsung.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/clk.h>
  #include <linux/err.h>
  #include <linux/gfp.h>
  #include <linux/interrupt.h>
  #include <linux/io.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/of.h>
  #include <linux/platform_device.h>
  #include <linux/pm_runtime.h>
  #include <linux/slab.h>
  #include <linux/spinlock.h>
  #include <linux/string.h>
  #include <media/v4l2-mem2mem.h>
  #include <media/v4l2-ioctl.h>
  #include <media/videobuf2-v4l2.h>
  #include <media/videobuf2-dma-contig.h>
  
  #include "jpeg-core.h"
  #include "jpeg-hw-s5p.h"
  #include "jpeg-hw-exynos4.h"
  #include "jpeg-hw-exynos3250.h"
  #include "jpeg-regs.h"
  
  static struct s5p_jpeg_fmt sjpeg_formats[] = {
  	{
  		.name		= "JPEG JFIF",
  		.fourcc		= V4L2_PIX_FMT_JPEG,
  		.flags		= SJPEG_FMT_FLAG_ENC_CAPTURE |
  				  SJPEG_FMT_FLAG_DEC_OUTPUT |
  				  SJPEG_FMT_FLAG_S5P |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_FLAG_EXYNOS4,
  	},
  	{
  		.name		= "YUV 4:2:2 packed, YCbYCr",
  		.fourcc		= V4L2_PIX_FMT_YUYV,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 4,
  		.v_align	= 3,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_S5P |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:2 packed, YCbYCr",
  		.fourcc		= V4L2_PIX_FMT_YUYV,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 1,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:2 packed, YCbYCr",
  		.fourcc		= V4L2_PIX_FMT_YUYV,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 2,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:2 packed, YCrYCb",
  		.fourcc		= V4L2_PIX_FMT_YVYU,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 1,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:2 packed, YCrYCb",
  		.fourcc		= V4L2_PIX_FMT_YVYU,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 2,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:2 packed, YCrYCb",
  		.fourcc		= V4L2_PIX_FMT_UYVY,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 2,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:2 packed, YCrYCb",
  		.fourcc		= V4L2_PIX_FMT_VYUY,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 2,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "RGB565",
  		.fourcc		= V4L2_PIX_FMT_RGB565,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 0,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "RGB565",
  		.fourcc		= V4L2_PIX_FMT_RGB565,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 2,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "RGB565X",
  		.fourcc		= V4L2_PIX_FMT_RGB565X,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 2,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "RGB565",
  		.fourcc		= V4L2_PIX_FMT_RGB565,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 0,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_S5P |
  				  SJPEG_FMT_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "ARGB8888, 32 bpp",
  		.fourcc		= V4L2_PIX_FMT_RGB32,
  		.depth		= 32,
  		.colplanes	= 1,
  		.h_align	= 0,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "ARGB8888, 32 bpp",
  		.fourcc		= V4L2_PIX_FMT_RGB32,
  		.depth		= 32,
  		.colplanes	= 1,
  		.h_align	= 2,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "YUV 4:4:4 planar, Y/CbCr",
  		.fourcc		= V4L2_PIX_FMT_NV24,
  		.depth		= 24,
  		.colplanes	= 2,
  		.h_align	= 0,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "YUV 4:4:4 planar, Y/CrCb",
  		.fourcc		= V4L2_PIX_FMT_NV42,
  		.depth		= 24,
  		.colplanes	= 2,
  		.h_align	= 0,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	},
  	{
  		.name		= "YUV 4:2:2 planar, Y/CrCb",
  		.fourcc		= V4L2_PIX_FMT_NV61,
  		.depth		= 16,
  		.colplanes	= 2,
  		.h_align	= 1,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:2 planar, Y/CbCr",
  		.fourcc		= V4L2_PIX_FMT_NV16,
  		.depth		= 16,
  		.colplanes	= 2,
  		.h_align	= 1,
  		.v_align	= 0,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	},
  	{
  		.name		= "YUV 4:2:0 planar, Y/CbCr",
  		.fourcc		= V4L2_PIX_FMT_NV12,
  		.depth		= 12,
  		.colplanes	= 2,
  		.h_align	= 1,
  		.v_align	= 1,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	},
  	{
  		.name		= "YUV 4:2:0 planar, Y/CbCr",
  		.fourcc		= V4L2_PIX_FMT_NV12,
  		.depth		= 12,
  		.colplanes	= 2,
  		.h_align	= 3,
  		.v_align	= 3,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	},
  	{
  		.name		= "YUV 4:2:0 planar, Y/CbCr",
  		.fourcc		= V4L2_PIX_FMT_NV12,
  		.depth		= 12,
  		.colplanes	= 2,
  		.h_align	= 4,
  		.v_align	= 4,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_S5P |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	},
  	{
  		.name		= "YUV 4:2:0 planar, Y/CrCb",
  		.fourcc		= V4L2_PIX_FMT_NV21,
  		.depth		= 12,
  		.colplanes	= 2,
  		.h_align	= 3,
  		.v_align	= 3,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	},
  	{
  		.name		= "YUV 4:2:0 planar, Y/CrCb",
  		.fourcc		= V4L2_PIX_FMT_NV21,
  		.depth		= 12,
  		.colplanes	= 2,
  		.h_align	= 1,
  		.v_align	= 1,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	},
  	{
  		.name		= "YUV 4:2:0 contiguous 3-planar, Y/Cb/Cr",
  		.fourcc		= V4L2_PIX_FMT_YUV420,
  		.depth		= 12,
  		.colplanes	= 3,
  		.h_align	= 1,
  		.v_align	= 1,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	},
  	{
  		.name		= "YUV 4:2:0 contiguous 3-planar, Y/Cb/Cr",
  		.fourcc		= V4L2_PIX_FMT_YUV420,
  		.depth		= 12,
  		.colplanes	= 3,
  		.h_align	= 4,
  		.v_align	= 4,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS3250 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	},
  	{
  		.name		= "Gray",
  		.fourcc		= V4L2_PIX_FMT_GREY,
  		.depth		= 8,
  		.colplanes	= 1,
  		.flags		= SJPEG_FMT_FLAG_ENC_OUTPUT |
  				  SJPEG_FMT_FLAG_DEC_CAPTURE |
  				  SJPEG_FMT_FLAG_EXYNOS4 |
  				  SJPEG_FMT_NON_RGB,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY,
  	},
  };
  #define SJPEG_NUM_FORMATS ARRAY_SIZE(sjpeg_formats)
  
  static const unsigned char qtbl_luminance[4][64] = {
  	{/*level 0 - high compression quality */
  		20, 16, 25, 39, 50, 46, 62, 68,
  		16, 18, 23, 38, 38, 53, 65, 68,
  		25, 23, 31, 38, 53, 65, 68, 68,
  		39, 38, 38, 53, 65, 68, 68, 68,
  		50, 38, 53, 65, 68, 68, 68, 68,
  		46, 53, 65, 68, 68, 68, 68, 68,
  		62, 65, 68, 68, 68, 68, 68, 68,
  		68, 68, 68, 68, 68, 68, 68, 68
  	},
  	{/* level 1 */
  		16, 11, 11, 16, 23, 27, 31, 30,
  		11, 12, 12, 15, 20, 23, 23, 30,
  		11, 12, 13, 16, 23, 26, 35, 47,
  		16, 15, 16, 23, 26, 37, 47, 64,
  		23, 20, 23, 26, 39, 51, 64, 64,
  		27, 23, 26, 37, 51, 64, 64, 64,
  		31, 23, 35, 47, 64, 64, 64, 64,
  		30, 30, 47, 64, 64, 64, 64, 64
  	},
  	{/* level 2 */
  		12,  8,  8, 12, 17, 21, 24, 23,
  		 8,  9,  9, 11, 15, 19, 18, 23,
  		 8,  9, 10, 12, 19, 20, 27, 36,
  		12, 11, 12, 21, 20, 28, 36, 53,
  		17, 15, 19, 20, 30, 39, 51, 59,
  		21, 19, 20, 28, 39, 51, 59, 59,
  		24, 18, 27, 36, 51, 59, 59, 59,
  		23, 23, 36, 53, 59, 59, 59, 59
  	},
  	{/* level 3 - low compression quality */
  		 8,  6,  6,  8, 12, 14, 16, 17,
  		 6,  6,  6,  8, 10, 13, 12, 15,
  		 6,  6,  7,  8, 13, 14, 18, 24,
  		 8,  8,  8, 14, 13, 19, 24, 35,
  		12, 10, 13, 13, 20, 26, 34, 39,
  		14, 13, 14, 19, 26, 34, 39, 39,
  		16, 12, 18, 24, 34, 39, 39, 39,
  		17, 15, 24, 35, 39, 39, 39, 39
  	}
  };
  
  static const unsigned char qtbl_chrominance[4][64] = {
  	{/*level 0 - high compression quality */
  		21, 25, 32, 38, 54, 68, 68, 68,
  		25, 28, 24, 38, 54, 68, 68, 68,
  		32, 24, 32, 43, 66, 68, 68, 68,
  		38, 38, 43, 53, 68, 68, 68, 68,
  		54, 54, 66, 68, 68, 68, 68, 68,
  		68, 68, 68, 68, 68, 68, 68, 68,
  		68, 68, 68, 68, 68, 68, 68, 68,
  		68, 68, 68, 68, 68, 68, 68, 68
  	},
  	{/* level 1 */
  		17, 15, 17, 21, 20, 26, 38, 48,
  		15, 19, 18, 17, 20, 26, 35, 43,
  		17, 18, 20, 22, 26, 30, 46, 53,
  		21, 17, 22, 28, 30, 39, 53, 64,
  		20, 20, 26, 30, 39, 48, 64, 64,
  		26, 26, 30, 39, 48, 63, 64, 64,
  		38, 35, 46, 53, 64, 64, 64, 64,
  		48, 43, 53, 64, 64, 64, 64, 64
  	},
  	{/* level 2 */
  		13, 11, 13, 16, 20, 20, 29, 37,
  		11, 14, 14, 14, 16, 20, 26, 32,
  		13, 14, 15, 17, 20, 23, 35, 40,
  		16, 14, 17, 21, 23, 30, 40, 50,
  		20, 16, 20, 23, 30, 37, 50, 59,
  		20, 20, 23, 30, 37, 48, 59, 59,
  		29, 26, 35, 40, 50, 59, 59, 59,
  		37, 32, 40, 50, 59, 59, 59, 59
  	},
  	{/* level 3 - low compression quality */
  		 9,  8,  9, 11, 14, 17, 19, 24,
  		 8, 10,  9, 11, 14, 13, 17, 22,
  		 9,  9, 13, 14, 13, 15, 23, 26,
  		11, 11, 14, 14, 15, 20, 26, 33,
  		14, 14, 13, 15, 20, 24, 33, 39,
  		17, 13, 15, 20, 24, 32, 39, 39,
  		19, 17, 23, 26, 33, 39, 39, 39,
  		24, 22, 26, 33, 39, 39, 39, 39
  	}
  };
  
  static const unsigned char hdctbl0[16] = {
  	0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0
  };
  
  static const unsigned char hdctblg0[12] = {
  	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb
  };
  static const unsigned char hactbl0[16] = {
  	0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d
  };
  static const unsigned char hactblg0[162] = {
  	0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
  	0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
  	0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
  	0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
  	0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
  	0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
  	0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
  	0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
  	0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
  	0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
  	0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
  	0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
  	0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
  	0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
  	0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
  	0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
  	0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
  	0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
  	0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
  	0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
  	0xf9, 0xfa
  };
  
  /*
   * Fourcc downgrade schema lookup tables for 422 and 420
   * chroma subsampling - fourcc on each position maps on the
   * fourcc from the table fourcc_to_dwngrd_schema_id which allows
   * to get the most suitable fourcc counterpart for the given
   * downgraded subsampling property.
   */
  static const u32 subs422_fourcc_dwngrd_schema[] = {
  	V4L2_PIX_FMT_NV16,
  	V4L2_PIX_FMT_NV61,
  };
  
  static const u32 subs420_fourcc_dwngrd_schema[] = {
  	V4L2_PIX_FMT_NV12,
  	V4L2_PIX_FMT_NV21,
  	V4L2_PIX_FMT_NV12,
  	V4L2_PIX_FMT_NV21,
  	V4L2_PIX_FMT_NV12,
  	V4L2_PIX_FMT_NV21,
  	V4L2_PIX_FMT_GREY,
  	V4L2_PIX_FMT_GREY,
  	V4L2_PIX_FMT_GREY,
  	V4L2_PIX_FMT_GREY,
  };
  
  /*
   * Lookup table for translation of a fourcc to the position
   * of its downgraded counterpart in the *fourcc_dwngrd_schema
   * tables.
   */
  static const u32 fourcc_to_dwngrd_schema_id[] = {
  	V4L2_PIX_FMT_NV24,
  	V4L2_PIX_FMT_NV42,
  	V4L2_PIX_FMT_NV16,
  	V4L2_PIX_FMT_NV61,
  	V4L2_PIX_FMT_YUYV,
  	V4L2_PIX_FMT_YVYU,
  	V4L2_PIX_FMT_NV12,
  	V4L2_PIX_FMT_NV21,
  	V4L2_PIX_FMT_YUV420,
  	V4L2_PIX_FMT_GREY,
  };
  
  static int s5p_jpeg_get_dwngrd_sch_id_by_fourcc(u32 fourcc)
  {
  	int i;
  
  	for (i = 0; i < ARRAY_SIZE(fourcc_to_dwngrd_schema_id); ++i) {
  		if (fourcc_to_dwngrd_schema_id[i] == fourcc)
  			return i;
  	}
  
  	return -EINVAL;
  }
  
  static int s5p_jpeg_adjust_fourcc_to_subsampling(
  					enum v4l2_jpeg_chroma_subsampling subs,
  					u32 in_fourcc,
  					u32 *out_fourcc,
  					struct s5p_jpeg_ctx *ctx)
  {
  	int dwngrd_sch_id;
  
  	if (ctx->subsampling != V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY) {
  		dwngrd_sch_id =
  			s5p_jpeg_get_dwngrd_sch_id_by_fourcc(in_fourcc);
  		if (dwngrd_sch_id < 0)
  			return -EINVAL;
  	}
  
  	switch (ctx->subsampling) {
  	case V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY:
  		*out_fourcc = V4L2_PIX_FMT_GREY;
  		break;
  	case V4L2_JPEG_CHROMA_SUBSAMPLING_420:
  		if (dwngrd_sch_id >
  				ARRAY_SIZE(subs420_fourcc_dwngrd_schema) - 1)
  			return -EINVAL;
  		*out_fourcc = subs420_fourcc_dwngrd_schema[dwngrd_sch_id];
  		break;
  	case V4L2_JPEG_CHROMA_SUBSAMPLING_422:
  		if (dwngrd_sch_id >
  				ARRAY_SIZE(subs422_fourcc_dwngrd_schema) - 1)
  			return -EINVAL;
  		*out_fourcc = subs422_fourcc_dwngrd_schema[dwngrd_sch_id];
  		break;
  	default:
  		*out_fourcc = V4L2_PIX_FMT_GREY;
  		break;
  	}
  
  	return 0;
  }
  
  static int exynos4x12_decoded_subsampling[] = {
  	V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY,
  	V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  };
  
  static int exynos3250_decoded_subsampling[] = {
  	V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  	V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  	V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  	V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY,
  	-1,
  	-1,
  	V4L2_JPEG_CHROMA_SUBSAMPLING_411,
  };
  
  static inline struct s5p_jpeg_ctx *ctrl_to_ctx(struct v4l2_ctrl *c)
  {
  	return container_of(c->handler, struct s5p_jpeg_ctx, ctrl_handler);
  }
  
  static inline struct s5p_jpeg_ctx *fh_to_ctx(struct v4l2_fh *fh)
  {
  	return container_of(fh, struct s5p_jpeg_ctx, fh);
  }
  
  static int s5p_jpeg_to_user_subsampling(struct s5p_jpeg_ctx *ctx)
  {
  	WARN_ON(ctx->subsampling > 3);
  
  	switch (ctx->jpeg->variant->version) {
  	case SJPEG_S5P:
  		if (ctx->subsampling > 2)
  			return V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY;
  		return ctx->subsampling;
  	case SJPEG_EXYNOS3250:
  	case SJPEG_EXYNOS5420:
  		if (ctx->subsampling > 3)
  			return V4L2_JPEG_CHROMA_SUBSAMPLING_411;
  		return exynos3250_decoded_subsampling[ctx->subsampling];
  	case SJPEG_EXYNOS4:
  	case SJPEG_EXYNOS5433:
  		if (ctx->subsampling > 2)
  			return V4L2_JPEG_CHROMA_SUBSAMPLING_420;
  		return exynos4x12_decoded_subsampling[ctx->subsampling];
  	default:
  		return V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY;
  	}
  }
  
  static inline void s5p_jpeg_set_qtbl(void __iomem *regs,
  				     const unsigned char *qtbl,
  				     unsigned long tab, int len)
  {
  	int i;
  
  	for (i = 0; i < len; i++)
  		writel((unsigned int)qtbl[i], regs + tab + (i * 0x04));
  }
  
  static inline void s5p_jpeg_set_qtbl_lum(void __iomem *regs, int quality)
  {
  	/* this driver fills quantisation table 0 with data for luma */
  	s5p_jpeg_set_qtbl(regs, qtbl_luminance[quality],
  			  S5P_JPG_QTBL_CONTENT(0),
  			  ARRAY_SIZE(qtbl_luminance[quality]));
  }
  
  static inline void s5p_jpeg_set_qtbl_chr(void __iomem *regs, int quality)
  {
  	/* this driver fills quantisation table 1 with data for chroma */
  	s5p_jpeg_set_qtbl(regs, qtbl_chrominance[quality],
  			  S5P_JPG_QTBL_CONTENT(1),
  			  ARRAY_SIZE(qtbl_chrominance[quality]));
  }
  
  static inline void s5p_jpeg_set_htbl(void __iomem *regs,
  				     const unsigned char *htbl,
  				     unsigned long tab, int len)
  {
  	int i;
  
  	for (i = 0; i < len; i++)
  		writel((unsigned int)htbl[i], regs + tab + (i * 0x04));
  }
  
  static inline void s5p_jpeg_set_hdctbl(void __iomem *regs)
  {
  	/* this driver fills table 0 for this component */
  	s5p_jpeg_set_htbl(regs, hdctbl0, S5P_JPG_HDCTBL(0),
  						ARRAY_SIZE(hdctbl0));
  }
  
  static inline void s5p_jpeg_set_hdctblg(void __iomem *regs)
  {
  	/* this driver fills table 0 for this component */
  	s5p_jpeg_set_htbl(regs, hdctblg0, S5P_JPG_HDCTBLG(0),
  						ARRAY_SIZE(hdctblg0));
  }
  
  static inline void s5p_jpeg_set_hactbl(void __iomem *regs)
  {
  	/* this driver fills table 0 for this component */
  	s5p_jpeg_set_htbl(regs, hactbl0, S5P_JPG_HACTBL(0),
  						ARRAY_SIZE(hactbl0));
  }
  
  static inline void s5p_jpeg_set_hactblg(void __iomem *regs)
  {
  	/* this driver fills table 0 for this component */
  	s5p_jpeg_set_htbl(regs, hactblg0, S5P_JPG_HACTBLG(0),
  						ARRAY_SIZE(hactblg0));
  }
  
  static inline void exynos4_jpeg_set_tbl(void __iomem *regs,
  					const unsigned char *tbl,
  					unsigned long tab, int len)
  {
  	int i;
  	unsigned int dword;
  
  	for (i = 0; i < len; i += 4) {
  		dword = tbl[i] |
  			(tbl[i + 1] << 8) |
  			(tbl[i + 2] << 16) |
  			(tbl[i + 3] << 24);
  		writel(dword, regs + tab + i);
  	}
  }
  
  static inline void exynos4_jpeg_set_qtbl_lum(void __iomem *regs, int quality)
  {
  	/* this driver fills quantisation table 0 with data for luma */
  	exynos4_jpeg_set_tbl(regs, qtbl_luminance[quality],
  			     EXYNOS4_QTBL_CONTENT(0),
  			     ARRAY_SIZE(qtbl_luminance[quality]));
  }
  
  static inline void exynos4_jpeg_set_qtbl_chr(void __iomem *regs, int quality)
  {
  	/* this driver fills quantisation table 1 with data for chroma */
  	exynos4_jpeg_set_tbl(regs, qtbl_chrominance[quality],
  			     EXYNOS4_QTBL_CONTENT(1),
  			     ARRAY_SIZE(qtbl_chrominance[quality]));
  }
  
  static void exynos4_jpeg_set_huff_tbl(void __iomem *base)
  {
  	exynos4_jpeg_set_tbl(base, hdctbl0, EXYNOS4_HUFF_TBL_HDCLL,
  							ARRAY_SIZE(hdctbl0));
  	exynos4_jpeg_set_tbl(base, hdctbl0, EXYNOS4_HUFF_TBL_HDCCL,
  							ARRAY_SIZE(hdctbl0));
  	exynos4_jpeg_set_tbl(base, hdctblg0, EXYNOS4_HUFF_TBL_HDCLV,
  							ARRAY_SIZE(hdctblg0));
  	exynos4_jpeg_set_tbl(base, hdctblg0, EXYNOS4_HUFF_TBL_HDCCV,
  							ARRAY_SIZE(hdctblg0));
  	exynos4_jpeg_set_tbl(base, hactbl0, EXYNOS4_HUFF_TBL_HACLL,
  							ARRAY_SIZE(hactbl0));
  	exynos4_jpeg_set_tbl(base, hactbl0, EXYNOS4_HUFF_TBL_HACCL,
  							ARRAY_SIZE(hactbl0));
  	exynos4_jpeg_set_tbl(base, hactblg0, EXYNOS4_HUFF_TBL_HACLV,
  							ARRAY_SIZE(hactblg0));
  	exynos4_jpeg_set_tbl(base, hactblg0, EXYNOS4_HUFF_TBL_HACCV,
  							ARRAY_SIZE(hactblg0));
  }
  
  static inline int __exynos4_huff_tbl(int class, int id, bool lenval)
  {
  	/*
  	 * class: 0 - DC, 1 - AC
  	 * id: 0 - Y, 1 - Cb/Cr
  	 */
  	if (class) {
  		if (id)
  			return lenval ? EXYNOS4_HUFF_TBL_HACCL :
  				EXYNOS4_HUFF_TBL_HACCV;
  		return lenval ? EXYNOS4_HUFF_TBL_HACLL : EXYNOS4_HUFF_TBL_HACLV;
  
  	}
  	/* class == 0 */
  	if (id)
  		return lenval ? EXYNOS4_HUFF_TBL_HDCCL : EXYNOS4_HUFF_TBL_HDCCV;
  
  	return lenval ? EXYNOS4_HUFF_TBL_HDCLL : EXYNOS4_HUFF_TBL_HDCLV;
  }
  
  static inline int exynos4_huff_tbl_len(int class, int id)
  {
  	return __exynos4_huff_tbl(class, id, true);
  }
  
  static inline int exynos4_huff_tbl_val(int class, int id)
  {
  	return __exynos4_huff_tbl(class, id, false);
  }
  
  static int get_byte(struct s5p_jpeg_buffer *buf);
  static int get_word_be(struct s5p_jpeg_buffer *buf, unsigned int *word);
  static void skip(struct s5p_jpeg_buffer *buf, long len);
  
  static void exynos4_jpeg_parse_decode_h_tbl(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct vb2_buffer *vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	struct s5p_jpeg_buffer jpeg_buffer;
  	unsigned int word;
  	int c, x, components;
  
  	jpeg_buffer.size = 2; /* Ls */
  	jpeg_buffer.data =
  		(unsigned long)vb2_plane_vaddr(vb, 0) + ctx->out_q.sos + 2;
  	jpeg_buffer.curr = 0;
  
  	word = 0;
  
  	if (get_word_be(&jpeg_buffer, &word))
  		return;
  	jpeg_buffer.size = (long)word - 2;
  	jpeg_buffer.data += 2;
  	jpeg_buffer.curr = 0;
  
  	components = get_byte(&jpeg_buffer);
  	if (components == -1)
  		return;
  	while (components--) {
  		c = get_byte(&jpeg_buffer);
  		if (c == -1)
  			return;
  		x = get_byte(&jpeg_buffer);
  		if (x == -1)
  			return;
  		exynos4_jpeg_select_dec_h_tbl(jpeg->regs, c,
  					(((x >> 4) & 0x1) << 1) | (x & 0x1));
  	}
  
  }
  
  static void exynos4_jpeg_parse_huff_tbl(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct vb2_buffer *vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	struct s5p_jpeg_buffer jpeg_buffer;
  	unsigned int word;
  	int c, i, n, j;
  
  	for (j = 0; j < ctx->out_q.dht.n; ++j) {
  		jpeg_buffer.size = ctx->out_q.dht.len[j];
  		jpeg_buffer.data = (unsigned long)vb2_plane_vaddr(vb, 0) +
  				   ctx->out_q.dht.marker[j];
  		jpeg_buffer.curr = 0;
  
  		word = 0;
  		while (jpeg_buffer.curr < jpeg_buffer.size) {
  			char id, class;
  
  			c = get_byte(&jpeg_buffer);
  			if (c == -1)
  				return;
  			id = c & 0xf;
  			class = (c >> 4) & 0xf;
  			n = 0;
  			for (i = 0; i < 16; ++i) {
  				c = get_byte(&jpeg_buffer);
  				if (c == -1)
  					return;
  				word |= c << ((i % 4) * 8);
  				if ((i + 1) % 4 == 0) {
  					writel(word, jpeg->regs +
  					exynos4_huff_tbl_len(class, id) +
  					(i / 4) * 4);
  					word = 0;
  				}
  				n += c;
  			}
  			word = 0;
  			for (i = 0; i < n; ++i) {
  				c = get_byte(&jpeg_buffer);
  				if (c == -1)
  					return;
  				word |= c << ((i % 4) * 8);
  				if ((i + 1) % 4 == 0) {
  					writel(word, jpeg->regs +
  					exynos4_huff_tbl_val(class, id) +
  					(i / 4) * 4);
  					word = 0;
  				}
  			}
  			if (i % 4) {
  				writel(word, jpeg->regs +
  				exynos4_huff_tbl_val(class, id) + (i / 4) * 4);
  			}
  			word = 0;
  		}
  	}
  }
  
  static void exynos4_jpeg_parse_decode_q_tbl(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct vb2_buffer *vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	struct s5p_jpeg_buffer jpeg_buffer;
  	int c, x, components;
  
  	jpeg_buffer.size = ctx->out_q.sof_len;
  	jpeg_buffer.data =
  		(unsigned long)vb2_plane_vaddr(vb, 0) + ctx->out_q.sof;
  	jpeg_buffer.curr = 0;
  
  	skip(&jpeg_buffer, 5); /* P, Y, X */
  	components = get_byte(&jpeg_buffer);
  	if (components == -1)
  		return;
  
  	exynos4_jpeg_set_dec_components(jpeg->regs, components);
  
  	while (components--) {
  		c = get_byte(&jpeg_buffer);
  		if (c == -1)
  			return;
  		skip(&jpeg_buffer, 1);
  		x = get_byte(&jpeg_buffer);
  		if (x == -1)
  			return;
  		exynos4_jpeg_select_dec_q_tbl(jpeg->regs, c, x);
  	}
  }
  
  static void exynos4_jpeg_parse_q_tbl(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct vb2_buffer *vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	struct s5p_jpeg_buffer jpeg_buffer;
  	unsigned int word;
  	int c, i, j;
  
  	for (j = 0; j < ctx->out_q.dqt.n; ++j) {
  		jpeg_buffer.size = ctx->out_q.dqt.len[j];
  		jpeg_buffer.data = (unsigned long)vb2_plane_vaddr(vb, 0) +
  				   ctx->out_q.dqt.marker[j];
  		jpeg_buffer.curr = 0;
  
  		word = 0;
  		while (jpeg_buffer.size - jpeg_buffer.curr >= 65) {
  			char id;
  
  			c = get_byte(&jpeg_buffer);
  			if (c == -1)
  				return;
  			id = c & 0xf;
  			/* nonzero means extended mode - not supported */
  			if ((c >> 4) & 0xf)
  				return;
  			for (i = 0; i < 64; ++i) {
  				c = get_byte(&jpeg_buffer);
  				if (c == -1)
  					return;
  				word |= c << ((i % 4) * 8);
  				if ((i + 1) % 4 == 0) {
  					writel(word, jpeg->regs +
  					EXYNOS4_QTBL_CONTENT(id) + (i / 4) * 4);
  					word = 0;
  				}
  			}
  			word = 0;
  		}
  	}
  }
  
  /*
   * ============================================================================
   * Device file operations
   * ============================================================================
   */
  
  static int queue_init(void *priv, struct vb2_queue *src_vq,
  		      struct vb2_queue *dst_vq);
  static struct s5p_jpeg_fmt *s5p_jpeg_find_format(struct s5p_jpeg_ctx *ctx,
  				__u32 pixelformat, unsigned int fmt_type);
  static int s5p_jpeg_controls_create(struct s5p_jpeg_ctx *ctx);
  
  static int s5p_jpeg_open(struct file *file)
  {
  	struct s5p_jpeg *jpeg = video_drvdata(file);
  	struct video_device *vfd = video_devdata(file);
  	struct s5p_jpeg_ctx *ctx;
  	struct s5p_jpeg_fmt *out_fmt, *cap_fmt;
  	int ret = 0;
  
  	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
  	if (!ctx)
  		return -ENOMEM;
  
  	if (mutex_lock_interruptible(&jpeg->lock)) {
  		ret = -ERESTARTSYS;
  		goto free;
  	}
  
  	v4l2_fh_init(&ctx->fh, vfd);
  	/* Use separate control handler per file handle */
  	ctx->fh.ctrl_handler = &ctx->ctrl_handler;
  	file->private_data = &ctx->fh;
  	v4l2_fh_add(&ctx->fh);
  
  	ctx->jpeg = jpeg;
  	if (vfd == jpeg->vfd_encoder) {
  		ctx->mode = S5P_JPEG_ENCODE;
  		out_fmt = s5p_jpeg_find_format(ctx, V4L2_PIX_FMT_RGB565,
  							FMT_TYPE_OUTPUT);
  		cap_fmt = s5p_jpeg_find_format(ctx, V4L2_PIX_FMT_JPEG,
  							FMT_TYPE_CAPTURE);
  	} else {
  		ctx->mode = S5P_JPEG_DECODE;
  		out_fmt = s5p_jpeg_find_format(ctx, V4L2_PIX_FMT_JPEG,
  							FMT_TYPE_OUTPUT);
  		cap_fmt = s5p_jpeg_find_format(ctx, V4L2_PIX_FMT_YUYV,
  							FMT_TYPE_CAPTURE);
  		ctx->scale_factor = EXYNOS3250_DEC_SCALE_FACTOR_8_8;
  	}
  
  	ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(jpeg->m2m_dev, ctx, queue_init);
  	if (IS_ERR(ctx->fh.m2m_ctx)) {
  		ret = PTR_ERR(ctx->fh.m2m_ctx);
  		goto error;
  	}
  
  	ctx->out_q.fmt = out_fmt;
  	ctx->cap_q.fmt = cap_fmt;
  
  	ret = s5p_jpeg_controls_create(ctx);
  	if (ret < 0)
  		goto error;
  
  	mutex_unlock(&jpeg->lock);
  	return 0;
  
  error:
  	v4l2_fh_del(&ctx->fh);
  	v4l2_fh_exit(&ctx->fh);
  	mutex_unlock(&jpeg->lock);
  free:
  	kfree(ctx);
  	return ret;
  }
  
  static int s5p_jpeg_release(struct file *file)
  {
  	struct s5p_jpeg *jpeg = video_drvdata(file);
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(file->private_data);
  
  	mutex_lock(&jpeg->lock);
  	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
  	v4l2_ctrl_handler_free(&ctx->ctrl_handler);
  	v4l2_fh_del(&ctx->fh);
  	v4l2_fh_exit(&ctx->fh);
  	kfree(ctx);
  	mutex_unlock(&jpeg->lock);
  
  	return 0;
  }
  
  static const struct v4l2_file_operations s5p_jpeg_fops = {
  	.owner		= THIS_MODULE,
  	.open		= s5p_jpeg_open,
  	.release	= s5p_jpeg_release,
  	.poll		= v4l2_m2m_fop_poll,
  	.unlocked_ioctl	= video_ioctl2,
  	.mmap		= v4l2_m2m_fop_mmap,
  };
  
  /*
   * ============================================================================
   * video ioctl operations
   * ============================================================================
   */
  
  static int get_byte(struct s5p_jpeg_buffer *buf)
  {
  	if (buf->curr >= buf->size)
  		return -1;
  
  	return ((unsigned char *)buf->data)[buf->curr++];
  }
  
  static int get_word_be(struct s5p_jpeg_buffer *buf, unsigned int *word)
  {
  	unsigned int temp;
  	int byte;
  
  	byte = get_byte(buf);
  	if (byte == -1)
  		return -1;
  	temp = byte << 8;
  	byte = get_byte(buf);
  	if (byte == -1)
  		return -1;
  	*word = (unsigned int)byte | temp;
  	return 0;
  }
  
  static void skip(struct s5p_jpeg_buffer *buf, long len)
  {
  	if (len <= 0)
  		return;
  
  	while (len--)
  		get_byte(buf);
  }
  
  static bool s5p_jpeg_parse_hdr(struct s5p_jpeg_q_data *result,
  			       unsigned long buffer, unsigned long size,
  			       struct s5p_jpeg_ctx *ctx)
  {
  	int c, components = 0, notfound, n_dht = 0, n_dqt = 0;
  	unsigned int height = 0, width = 0, word, subsampling = 0;
  	unsigned int sos = 0, sof = 0, sof_len = 0;
  	unsigned int dht[S5P_JPEG_MAX_MARKER], dht_len[S5P_JPEG_MAX_MARKER];
  	unsigned int dqt[S5P_JPEG_MAX_MARKER], dqt_len[S5P_JPEG_MAX_MARKER];
  	long length;
  	struct s5p_jpeg_buffer jpeg_buffer;
  
  	jpeg_buffer.size = size;
  	jpeg_buffer.data = buffer;
  	jpeg_buffer.curr = 0;
  
  	notfound = 1;
  	while (notfound || !sos) {
  		c = get_byte(&jpeg_buffer);
  		if (c == -1)
  			return false;
  		if (c != 0xff)
  			continue;
  		do
  			c = get_byte(&jpeg_buffer);
  		while (c == 0xff);
  		if (c == -1)
  			return false;
  		if (c == 0)
  			continue;
  		length = 0;
  		switch (c) {
  		/* SOF0: baseline JPEG */
  		case SOF0:
  			if (get_word_be(&jpeg_buffer, &word))
  				break;
  			length = (long)word - 2;
  			if (!length)
  				return false;
  			sof = jpeg_buffer.curr; /* after 0xffc0 */
  			sof_len = length;
  			if (get_byte(&jpeg_buffer) == -1)
  				break;
  			if (get_word_be(&jpeg_buffer, &height))
  				break;
  			if (get_word_be(&jpeg_buffer, &width))
  				break;
  			components = get_byte(&jpeg_buffer);
  			if (components == -1)
  				break;
  
  			if (components == 1) {
  				subsampling = 0x33;
  			} else {
  				skip(&jpeg_buffer, 1);
  				subsampling = get_byte(&jpeg_buffer);
  				skip(&jpeg_buffer, 1);
  			}
  			if (components > 3)
  				return false;
  			skip(&jpeg_buffer, components * 2);
  			notfound = 0;
  			break;
  
  		case DQT:
  			if (get_word_be(&jpeg_buffer, &word))
  				break;
  			length = (long)word - 2;
  			if (!length)
  				return false;
  			if (n_dqt >= S5P_JPEG_MAX_MARKER)
  				return false;
  			dqt[n_dqt] = jpeg_buffer.curr; /* after 0xffdb */
  			dqt_len[n_dqt++] = length;
  			skip(&jpeg_buffer, length);
  			break;
  
  		case DHT:
  			if (get_word_be(&jpeg_buffer, &word))
  				break;
  			length = (long)word - 2;
  			if (!length)
  				return false;
  			if (n_dht >= S5P_JPEG_MAX_MARKER)
  				return false;
  			dht[n_dht] = jpeg_buffer.curr; /* after 0xffc4 */
  			dht_len[n_dht++] = length;
  			skip(&jpeg_buffer, length);
  			break;
  
  		case SOS:
  			sos = jpeg_buffer.curr - 2; /* 0xffda */
  			break;
  
  		/* skip payload-less markers */
  		case RST ... RST + 7:
  		case SOI:
  		case EOI:
  		case TEM:
  			break;
  
  		/* skip uninteresting payload markers */
  		default:
  			if (get_word_be(&jpeg_buffer, &word))
  				break;
  			length = (long)word - 2;
  			skip(&jpeg_buffer, length);
  			break;
  		}
  	}
  	result->w = width;
  	result->h = height;
  	result->sos = sos;
  	result->dht.n = n_dht;
  	while (n_dht--) {
  		result->dht.marker[n_dht] = dht[n_dht];
  		result->dht.len[n_dht] = dht_len[n_dht];
  	}
  	result->dqt.n = n_dqt;
  	while (n_dqt--) {
  		result->dqt.marker[n_dqt] = dqt[n_dqt];
  		result->dqt.len[n_dqt] = dqt_len[n_dqt];
  	}
  	result->sof = sof;
  	result->sof_len = sof_len;
  	result->size = result->components = components;
  
  	switch (subsampling) {
  	case 0x11:
  		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_444;
  		break;
  	case 0x21:
  		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_422;
  		break;
  	case 0x22:
  		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_420;
  		break;
  	case 0x33:
  		ctx->subsampling = V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY;
  		break;
  	default:
  		return false;
  	}
  
  	return !notfound && sos;
  }
  
  static int s5p_jpeg_querycap(struct file *file, void *priv,
  			   struct v4l2_capability *cap)
  {
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(priv);
  
  	if (ctx->mode == S5P_JPEG_ENCODE) {
  		strlcpy(cap->driver, S5P_JPEG_M2M_NAME,
  			sizeof(cap->driver));
  		strlcpy(cap->card, S5P_JPEG_M2M_NAME " encoder",
  			sizeof(cap->card));
  	} else {
  		strlcpy(cap->driver, S5P_JPEG_M2M_NAME,
  			sizeof(cap->driver));
  		strlcpy(cap->card, S5P_JPEG_M2M_NAME " decoder",
  			sizeof(cap->card));
  	}
  	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
  		 dev_name(ctx->jpeg->dev));
  	cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M;
  	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
  	return 0;
  }
  
  static int enum_fmt(struct s5p_jpeg_fmt *sjpeg_formats, int n,
  		    struct v4l2_fmtdesc *f, u32 type)
  {
  	int i, num = 0;
  
  	for (i = 0; i < n; ++i) {
  		if (sjpeg_formats[i].flags & type) {
  			/* index-th format of type type found ? */
  			if (num == f->index)
  				break;
  			/* Correct type but haven't reached our index yet,
  			 * just increment per-type index
  			 */
  			++num;
  		}
  	}
  
  	/* Format not found */
  	if (i >= n)
  		return -EINVAL;
  
  	strlcpy(f->description, sjpeg_formats[i].name, sizeof(f->description));
  	f->pixelformat = sjpeg_formats[i].fourcc;
  
  	return 0;
  }
  
  static int s5p_jpeg_enum_fmt_vid_cap(struct file *file, void *priv,
  				   struct v4l2_fmtdesc *f)
  {
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(priv);
  
  	if (ctx->mode == S5P_JPEG_ENCODE)
  		return enum_fmt(sjpeg_formats, SJPEG_NUM_FORMATS, f,
  				SJPEG_FMT_FLAG_ENC_CAPTURE);
  
  	return enum_fmt(sjpeg_formats, SJPEG_NUM_FORMATS, f,
  					SJPEG_FMT_FLAG_DEC_CAPTURE);
  }
  
  static int s5p_jpeg_enum_fmt_vid_out(struct file *file, void *priv,
  				   struct v4l2_fmtdesc *f)
  {
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(priv);
  
  	if (ctx->mode == S5P_JPEG_ENCODE)
  		return enum_fmt(sjpeg_formats, SJPEG_NUM_FORMATS, f,
  				SJPEG_FMT_FLAG_ENC_OUTPUT);
  
  	return enum_fmt(sjpeg_formats, SJPEG_NUM_FORMATS, f,
  					SJPEG_FMT_FLAG_DEC_OUTPUT);
  }
  
  static struct s5p_jpeg_q_data *get_q_data(struct s5p_jpeg_ctx *ctx,
  					  enum v4l2_buf_type type)
  {
  	if (type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
  		return &ctx->out_q;
  	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
  		return &ctx->cap_q;
  
  	return NULL;
  }
  
  static int s5p_jpeg_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
  {
  	struct vb2_queue *vq;
  	struct s5p_jpeg_q_data *q_data = NULL;
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  	struct s5p_jpeg_ctx *ct = fh_to_ctx(priv);
  
  	vq = v4l2_m2m_get_vq(ct->fh.m2m_ctx, f->type);
  	if (!vq)
  		return -EINVAL;
  
  	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE &&
  	    ct->mode == S5P_JPEG_DECODE && !ct->hdr_parsed)
  		return -EINVAL;
  	q_data = get_q_data(ct, f->type);
  	BUG_ON(q_data == NULL);
  
  	pix->width = q_data->w;
  	pix->height = q_data->h;
  	pix->field = V4L2_FIELD_NONE;
  	pix->pixelformat = q_data->fmt->fourcc;
  	pix->bytesperline = 0;
  	if (q_data->fmt->fourcc != V4L2_PIX_FMT_JPEG) {
  		u32 bpl = q_data->w;
  
  		if (q_data->fmt->colplanes == 1)
  			bpl = (bpl * q_data->fmt->depth) >> 3;
  		pix->bytesperline = bpl;
  	}
  	pix->sizeimage = q_data->size;
  
  	return 0;
  }
  
  static struct s5p_jpeg_fmt *s5p_jpeg_find_format(struct s5p_jpeg_ctx *ctx,
  				u32 pixelformat, unsigned int fmt_type)
  {
  	unsigned int k, fmt_flag;
  
  	if (ctx->mode == S5P_JPEG_ENCODE)
  		fmt_flag = (fmt_type == FMT_TYPE_OUTPUT) ?
  				SJPEG_FMT_FLAG_ENC_OUTPUT :
  				SJPEG_FMT_FLAG_ENC_CAPTURE;
  	else
  		fmt_flag = (fmt_type == FMT_TYPE_OUTPUT) ?
  				SJPEG_FMT_FLAG_DEC_OUTPUT :
  				SJPEG_FMT_FLAG_DEC_CAPTURE;
  
  	for (k = 0; k < ARRAY_SIZE(sjpeg_formats); k++) {
  		struct s5p_jpeg_fmt *fmt = &sjpeg_formats[k];
  
  		if (fmt->fourcc == pixelformat &&
  		    fmt->flags & fmt_flag &&
  		    fmt->flags & ctx->jpeg->variant->fmt_ver_flag) {
  			return fmt;
  		}
  	}
  
  	return NULL;
  }
  
  static void jpeg_bound_align_image(struct s5p_jpeg_ctx *ctx,
  				   u32 *w, unsigned int wmin, unsigned int wmax,
  				   unsigned int walign,
  				   u32 *h, unsigned int hmin, unsigned int hmax,
  				   unsigned int halign)
  {
  	int width, height, w_step, h_step;
  
  	width = *w;
  	height = *h;
  
  	w_step = 1 << walign;
  	h_step = 1 << halign;
  
  	if (ctx->jpeg->variant->hw3250_compat) {
  		/*
  		 * Rightmost and bottommost pixels are cropped by the
  		 * Exynos3250/compatible JPEG IP for RGB formats, for the
  		 * specific width and height values respectively. This
  		 * assignment will result in v4l_bound_align_image returning
  		 * dimensions reduced by 1 for the aforementioned cases.
  		 */
  		if (w_step == 4 && ((width & 3) == 1)) {
  			wmax = width;
  			hmax = height;
  		}
  	}
  
  	v4l_bound_align_image(w, wmin, wmax, walign, h, hmin, hmax, halign, 0);
  
  	if (*w < width && (*w + w_step) < wmax)
  		*w += w_step;
  	if (*h < height && (*h + h_step) < hmax)
  		*h += h_step;
  }
  
  static int vidioc_try_fmt(struct v4l2_format *f, struct s5p_jpeg_fmt *fmt,
  			  struct s5p_jpeg_ctx *ctx, int q_type)
  {
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  
  	if (pix->field == V4L2_FIELD_ANY)
  		pix->field = V4L2_FIELD_NONE;
  	else if (pix->field != V4L2_FIELD_NONE)
  		return -EINVAL;
  
  	/* V4L2 specification suggests the driver corrects the format struct
  	 * if any of the dimensions is unsupported
  	 */
  	if (q_type == FMT_TYPE_OUTPUT)
  		jpeg_bound_align_image(ctx, &pix->width, S5P_JPEG_MIN_WIDTH,
  				       S5P_JPEG_MAX_WIDTH, 0,
  				       &pix->height, S5P_JPEG_MIN_HEIGHT,
  				       S5P_JPEG_MAX_HEIGHT, 0);
  	else
  		jpeg_bound_align_image(ctx, &pix->width, S5P_JPEG_MIN_WIDTH,
  				       S5P_JPEG_MAX_WIDTH, fmt->h_align,
  				       &pix->height, S5P_JPEG_MIN_HEIGHT,
  				       S5P_JPEG_MAX_HEIGHT, fmt->v_align);
  
  	if (fmt->fourcc == V4L2_PIX_FMT_JPEG) {
  		if (pix->sizeimage <= 0)
  			pix->sizeimage = PAGE_SIZE;
  		pix->bytesperline = 0;
  	} else {
  		u32 bpl = pix->bytesperline;
  
  		if (fmt->colplanes > 1 && bpl < pix->width)
  			bpl = pix->width; /* planar */
  
  		if (fmt->colplanes == 1 && /* packed */
  		    (bpl << 3) / fmt->depth < pix->width)
  			bpl = (pix->width * fmt->depth) >> 3;
  
  		pix->bytesperline = bpl;
  		pix->sizeimage = (pix->width * pix->height * fmt->depth) >> 3;
  	}
  
  	return 0;
  }
  
  static int s5p_jpeg_try_fmt_vid_cap(struct file *file, void *priv,
  				  struct v4l2_format *f)
  {
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(priv);
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  	struct s5p_jpeg_fmt *fmt;
  	int ret;
  
  	fmt = s5p_jpeg_find_format(ctx, f->fmt.pix.pixelformat,
  						FMT_TYPE_CAPTURE);
  	if (!fmt) {
  		v4l2_err(&ctx->jpeg->v4l2_dev,
  			 "Fourcc format (0x%08x) invalid.\n",
  			 f->fmt.pix.pixelformat);
  		return -EINVAL;
  	}
  
  	if (!ctx->jpeg->variant->hw_ex4_compat || ctx->mode != S5P_JPEG_DECODE)
  		goto exit;
  
  	/*
  	 * The exynos4x12 device requires resulting YUV image
  	 * subsampling not to be lower than the input jpeg subsampling.
  	 * If this requirement is not met then downgrade the requested
  	 * capture format to the one with subsampling equal to the input jpeg.
  	 */
  	if ((fmt->flags & SJPEG_FMT_NON_RGB) &&
  	    (fmt->subsampling < ctx->subsampling)) {
  		ret = s5p_jpeg_adjust_fourcc_to_subsampling(ctx->subsampling,
  							    fmt->fourcc,
  							    &pix->pixelformat,
  							    ctx);
  		if (ret < 0)
  			pix->pixelformat = V4L2_PIX_FMT_GREY;
  
  		fmt = s5p_jpeg_find_format(ctx, pix->pixelformat,
  							FMT_TYPE_CAPTURE);
  	}
  
  	/*
  	 * Decompression of a JPEG file with 4:2:0 subsampling and odd
  	 * width to the YUV 4:2:0 compliant formats produces a raw image
  	 * with broken luma component. Adjust capture format to RGB565
  	 * in such a case.
  	 */
  	if (ctx->subsampling == V4L2_JPEG_CHROMA_SUBSAMPLING_420 &&
  	    (ctx->out_q.w & 1) &&
  	    (pix->pixelformat == V4L2_PIX_FMT_NV12 ||
  	     pix->pixelformat == V4L2_PIX_FMT_NV21 ||
  	     pix->pixelformat == V4L2_PIX_FMT_YUV420)) {
  		pix->pixelformat = V4L2_PIX_FMT_RGB565;
  		fmt = s5p_jpeg_find_format(ctx, pix->pixelformat,
  							FMT_TYPE_CAPTURE);
  	}
  
  exit:
  	return vidioc_try_fmt(f, fmt, ctx, FMT_TYPE_CAPTURE);
  }
  
  static int s5p_jpeg_try_fmt_vid_out(struct file *file, void *priv,
  				  struct v4l2_format *f)
  {
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(priv);
  	struct s5p_jpeg_fmt *fmt;
  
  	fmt = s5p_jpeg_find_format(ctx, f->fmt.pix.pixelformat,
  						FMT_TYPE_OUTPUT);
  	if (!fmt) {
  		v4l2_err(&ctx->jpeg->v4l2_dev,
  			 "Fourcc format (0x%08x) invalid.\n",
  			 f->fmt.pix.pixelformat);
  		return -EINVAL;
  	}
  
  	return vidioc_try_fmt(f, fmt, ctx, FMT_TYPE_OUTPUT);
  }
  
  static int exynos4_jpeg_get_output_buffer_size(struct s5p_jpeg_ctx *ctx,
  						struct v4l2_format *f,
  						int fmt_depth)
  {
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  	u32 pix_fmt = f->fmt.pix.pixelformat;
  	int w = pix->width, h = pix->height, wh_align;
  	int padding = 0;
  
  	if (pix_fmt == V4L2_PIX_FMT_RGB32 ||
  	    pix_fmt == V4L2_PIX_FMT_RGB565 ||
  	    pix_fmt == V4L2_PIX_FMT_NV24 ||
  	    pix_fmt == V4L2_PIX_FMT_NV42 ||
  	    pix_fmt == V4L2_PIX_FMT_NV12 ||
  	    pix_fmt == V4L2_PIX_FMT_NV21 ||
  	    pix_fmt == V4L2_PIX_FMT_YUV420)
  		wh_align = 4;
  	else
  		wh_align = 1;
  
  	jpeg_bound_align_image(ctx, &w, S5P_JPEG_MIN_WIDTH,
  			       S5P_JPEG_MAX_WIDTH, wh_align,
  			       &h, S5P_JPEG_MIN_HEIGHT,
  			       S5P_JPEG_MAX_HEIGHT, wh_align);
  
  	if (ctx->jpeg->variant->version == SJPEG_EXYNOS4)
  		padding = PAGE_SIZE;
  
  	return (w * h * fmt_depth >> 3) + padding;
  }
  
  static int exynos3250_jpeg_try_downscale(struct s5p_jpeg_ctx *ctx,
  				   struct v4l2_rect *r);
  
  static int s5p_jpeg_s_fmt(struct s5p_jpeg_ctx *ct, struct v4l2_format *f)
  {
  	struct vb2_queue *vq;
  	struct s5p_jpeg_q_data *q_data = NULL;
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  	struct v4l2_ctrl *ctrl_subs;
  	struct v4l2_rect scale_rect;
  	unsigned int f_type;
  
  	vq = v4l2_m2m_get_vq(ct->fh.m2m_ctx, f->type);
  	if (!vq)
  		return -EINVAL;
  
  	q_data = get_q_data(ct, f->type);
  	BUG_ON(q_data == NULL);
  
  	if (vb2_is_busy(vq)) {
  		v4l2_err(&ct->jpeg->v4l2_dev, "%s queue busy\n", __func__);
  		return -EBUSY;
  	}
  
  	f_type = V4L2_TYPE_IS_OUTPUT(f->type) ?
  			FMT_TYPE_OUTPUT : FMT_TYPE_CAPTURE;
  
  	q_data->fmt = s5p_jpeg_find_format(ct, pix->pixelformat, f_type);
  	q_data->w = pix->width;
  	q_data->h = pix->height;
  	if (q_data->fmt->fourcc != V4L2_PIX_FMT_JPEG) {
  		/*
  		 * During encoding Exynos4x12 SoCs access wider memory area
  		 * than it results from Image_x and Image_y values written to
  		 * the JPEG_IMAGE_SIZE register. In order to avoid sysmmu
  		 * page fault calculate proper buffer size in such a case.
  		 */
  		if (ct->jpeg->variant->hw_ex4_compat &&
  		    f_type == FMT_TYPE_OUTPUT && ct->mode == S5P_JPEG_ENCODE)
  			q_data->size = exynos4_jpeg_get_output_buffer_size(ct,
  							f,
  							q_data->fmt->depth);
  		else
  			q_data->size = q_data->w * q_data->h *
  						q_data->fmt->depth >> 3;
  	} else {
  		q_data->size = pix->sizeimage;
  	}
  
  	if (f_type == FMT_TYPE_OUTPUT) {
  		ctrl_subs = v4l2_ctrl_find(&ct->ctrl_handler,
  					V4L2_CID_JPEG_CHROMA_SUBSAMPLING);
  		if (ctrl_subs)
  			v4l2_ctrl_s_ctrl(ctrl_subs, q_data->fmt->subsampling);
  		ct->crop_altered = false;
  	}
  
  	/*
  	 * For decoding init crop_rect with capture buffer dimmensions which
  	 * contain aligned dimensions of the input JPEG image and do it only
  	 * if crop rectangle hasn't been altered by the user space e.g. with
  	 * S_SELECTION ioctl. For encoding assign output buffer dimensions.
  	 */
  	if (!ct->crop_altered &&
  	    ((ct->mode == S5P_JPEG_DECODE && f_type == FMT_TYPE_CAPTURE) ||
  	     (ct->mode == S5P_JPEG_ENCODE && f_type == FMT_TYPE_OUTPUT))) {
  		ct->crop_rect.width = pix->width;
  		ct->crop_rect.height = pix->height;
  	}
  
  	/*
  	 * Prevent downscaling to YUV420 format by more than 2
  	 * for Exynos3250/compatible SoC as it produces broken raw image
  	 * in such cases.
  	 */
  	if (ct->mode == S5P_JPEG_DECODE &&
  	    f_type == FMT_TYPE_CAPTURE &&
  	    ct->jpeg->variant->hw3250_compat &&
  	    pix->pixelformat == V4L2_PIX_FMT_YUV420 &&
  	    ct->scale_factor > 2) {
  		scale_rect.width = ct->out_q.w / 2;
  		scale_rect.height = ct->out_q.h / 2;
  		exynos3250_jpeg_try_downscale(ct, &scale_rect);
  	}
  
  	return 0;
  }
  
  static int s5p_jpeg_s_fmt_vid_cap(struct file *file, void *priv,
  				struct v4l2_format *f)
  {
  	int ret;
  
  	ret = s5p_jpeg_try_fmt_vid_cap(file, priv, f);
  	if (ret)
  		return ret;
  
  	return s5p_jpeg_s_fmt(fh_to_ctx(priv), f);
  }
  
  static int s5p_jpeg_s_fmt_vid_out(struct file *file, void *priv,
  				struct v4l2_format *f)
  {
  	int ret;
  
  	ret = s5p_jpeg_try_fmt_vid_out(file, priv, f);
  	if (ret)
  		return ret;
  
  	return s5p_jpeg_s_fmt(fh_to_ctx(priv), f);
  }
  
  static int exynos3250_jpeg_try_downscale(struct s5p_jpeg_ctx *ctx,
  				   struct v4l2_rect *r)
  {
  	int w_ratio, h_ratio, scale_factor, cur_ratio, i;
  
  	w_ratio = ctx->out_q.w / r->width;
  	h_ratio = ctx->out_q.h / r->height;
  
  	scale_factor = w_ratio > h_ratio ? w_ratio : h_ratio;
  	scale_factor = clamp_val(scale_factor, 1, 8);
  
  	/* Align scale ratio to the nearest power of 2 */
  	for (i = 0; i <= 3; ++i) {
  		cur_ratio = 1 << i;
  		if (scale_factor <= cur_ratio) {
  			ctx->scale_factor = cur_ratio;
  			break;
  		}
  	}
  
  	r->width = round_down(ctx->out_q.w / ctx->scale_factor, 2);
  	r->height = round_down(ctx->out_q.h / ctx->scale_factor, 2);
  
  	ctx->crop_rect.width = r->width;
  	ctx->crop_rect.height = r->height;
  	ctx->crop_rect.left = 0;
  	ctx->crop_rect.top = 0;
  
  	ctx->crop_altered = true;
  
  	return 0;
  }
  
  /* Return 1 if rectangle a is enclosed in rectangle b, or 0 otherwise. */
  static int enclosed_rectangle(struct v4l2_rect *a, struct v4l2_rect *b)
  {
  	if (a->left < b->left || a->top < b->top)
  		return 0;
  	if (a->left + a->width > b->left + b->width)
  		return 0;
  	if (a->top + a->height > b->top + b->height)
  		return 0;
  
  	return 1;
  }
  
  static int exynos3250_jpeg_try_crop(struct s5p_jpeg_ctx *ctx,
  				   struct v4l2_rect *r)
  {
  	struct v4l2_rect base_rect;
  	int w_step, h_step;
  
  	switch (ctx->cap_q.fmt->fourcc) {
  	case V4L2_PIX_FMT_NV12:
  	case V4L2_PIX_FMT_NV21:
  		w_step = 1;
  		h_step = 2;
  		break;
  	case V4L2_PIX_FMT_YUV420:
  		w_step = 2;
  		h_step = 2;
  		break;
  	default:
  		w_step = 1;
  		h_step = 1;
  		break;
  	}
  
  	base_rect.top = 0;
  	base_rect.left = 0;
  	base_rect.width = ctx->out_q.w;
  	base_rect.height = ctx->out_q.h;
  
  	r->width = round_down(r->width, w_step);
  	r->height = round_down(r->height, h_step);
  	r->left = round_down(r->left, 2);
  	r->top = round_down(r->top, 2);
  
  	if (!enclosed_rectangle(r, &base_rect))
  		return -EINVAL;
  
  	ctx->crop_rect.left = r->left;
  	ctx->crop_rect.top = r->top;
  	ctx->crop_rect.width = r->width;
  	ctx->crop_rect.height = r->height;
  
  	ctx->crop_altered = true;
  
  	return 0;
  }
  
  /*
   * V4L2 controls
   */
  
  static int s5p_jpeg_g_selection(struct file *file, void *priv,
  			 struct v4l2_selection *s)
  {
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(priv);
  
  	if (s->type != V4L2_BUF_TYPE_VIDEO_OUTPUT &&
  	    s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
  		return -EINVAL;
  
  	/* For JPEG blob active == default == bounds */
  	switch (s->target) {
  	case V4L2_SEL_TGT_CROP:
  	case V4L2_SEL_TGT_CROP_BOUNDS:
  	case V4L2_SEL_TGT_CROP_DEFAULT:
  	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
  		s->r.width = ctx->out_q.w;
  		s->r.height = ctx->out_q.h;
  		s->r.left = 0;
  		s->r.top = 0;
  		break;
  	case V4L2_SEL_TGT_COMPOSE:
  	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
  	case V4L2_SEL_TGT_COMPOSE_PADDED:
  		s->r.width = ctx->crop_rect.width;
  		s->r.height =  ctx->crop_rect.height;
  		s->r.left = ctx->crop_rect.left;
  		s->r.top = ctx->crop_rect.top;
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }
  
  /*
   * V4L2 controls
   */
  static int s5p_jpeg_s_selection(struct file *file, void *fh,
  				  struct v4l2_selection *s)
  {
  	struct s5p_jpeg_ctx *ctx = fh_to_ctx(file->private_data);
  	struct v4l2_rect *rect = &s->r;
  	int ret = -EINVAL;
  
  	if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
  		return -EINVAL;
  
  	if (s->target == V4L2_SEL_TGT_COMPOSE) {
  		if (ctx->mode != S5P_JPEG_DECODE)
  			return -EINVAL;
  		if (ctx->jpeg->variant->hw3250_compat)
  			ret = exynos3250_jpeg_try_downscale(ctx, rect);
  	} else if (s->target == V4L2_SEL_TGT_CROP) {
  		if (ctx->mode != S5P_JPEG_ENCODE)
  			return -EINVAL;
  		if (ctx->jpeg->variant->hw3250_compat)
  			ret = exynos3250_jpeg_try_crop(ctx, rect);
  	}
  
  	return ret;
  }
  
  static int s5p_jpeg_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
  {
  	struct s5p_jpeg_ctx *ctx = ctrl_to_ctx(ctrl);
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	unsigned long flags;
  
  	switch (ctrl->id) {
  	case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
  		spin_lock_irqsave(&jpeg->slock, flags);
  		ctrl->val = s5p_jpeg_to_user_subsampling(ctx);
  		spin_unlock_irqrestore(&jpeg->slock, flags);
  		break;
  	}
  
  	return 0;
  }
  
  static int s5p_jpeg_adjust_subs_ctrl(struct s5p_jpeg_ctx *ctx, int *ctrl_val)
  {
  	switch (ctx->jpeg->variant->version) {
  	case SJPEG_S5P:
  		return 0;
  	case SJPEG_EXYNOS3250:
  	case SJPEG_EXYNOS5420:
  		/*
  		 * The exynos3250/compatible device can produce JPEG image only
  		 * of 4:4:4 subsampling when given RGB32 source image.
  		 */
  		if (ctx->out_q.fmt->fourcc == V4L2_PIX_FMT_RGB32)
  			*ctrl_val = 0;
  		break;
  	case SJPEG_EXYNOS4:
  		/*
  		 * The exynos4x12 device requires input raw image fourcc
  		 * to be V4L2_PIX_FMT_GREY if gray jpeg format
  		 * is to be set.
  		 */
  		if (ctx->out_q.fmt->fourcc != V4L2_PIX_FMT_GREY &&
  		    *ctrl_val == V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY)
  			return -EINVAL;
  		break;
  	}
  
  	/*
  	 * The exynos4x12 and exynos3250/compatible devices require resulting
  	 * jpeg subsampling not to be lower than the input raw image
  	 * subsampling.
  	 */
  	if (ctx->out_q.fmt->subsampling > *ctrl_val)
  		*ctrl_val = ctx->out_q.fmt->subsampling;
  
  	return 0;
  }
  
  static int s5p_jpeg_try_ctrl(struct v4l2_ctrl *ctrl)
  {
  	struct s5p_jpeg_ctx *ctx = ctrl_to_ctx(ctrl);
  	unsigned long flags;
  	int ret = 0;
  
  	spin_lock_irqsave(&ctx->jpeg->slock, flags);
  
  	if (ctrl->id == V4L2_CID_JPEG_CHROMA_SUBSAMPLING)
  		ret = s5p_jpeg_adjust_subs_ctrl(ctx, &ctrl->val);
  
  	spin_unlock_irqrestore(&ctx->jpeg->slock, flags);
  	return ret;
  }
  
  static int s5p_jpeg_s_ctrl(struct v4l2_ctrl *ctrl)
  {
  	struct s5p_jpeg_ctx *ctx = ctrl_to_ctx(ctrl);
  	unsigned long flags;
  
  	spin_lock_irqsave(&ctx->jpeg->slock, flags);
  
  	switch (ctrl->id) {
  	case V4L2_CID_JPEG_COMPRESSION_QUALITY:
  		ctx->compr_quality = ctrl->val;
  		break;
  	case V4L2_CID_JPEG_RESTART_INTERVAL:
  		ctx->restart_interval = ctrl->val;
  		break;
  	case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
  		ctx->subsampling = ctrl->val;
  		break;
  	}
  
  	spin_unlock_irqrestore(&ctx->jpeg->slock, flags);
  	return 0;
  }
  
  static const struct v4l2_ctrl_ops s5p_jpeg_ctrl_ops = {
  	.g_volatile_ctrl	= s5p_jpeg_g_volatile_ctrl,
  	.try_ctrl		= s5p_jpeg_try_ctrl,
  	.s_ctrl			= s5p_jpeg_s_ctrl,
  };
  
  static int s5p_jpeg_controls_create(struct s5p_jpeg_ctx *ctx)
  {
  	unsigned int mask = ~0x27; /* 444, 422, 420, GRAY */
  	struct v4l2_ctrl *ctrl;
  	int ret;
  
  	v4l2_ctrl_handler_init(&ctx->ctrl_handler, 3);
  
  	if (ctx->mode == S5P_JPEG_ENCODE) {
  		v4l2_ctrl_new_std(&ctx->ctrl_handler, &s5p_jpeg_ctrl_ops,
  				  V4L2_CID_JPEG_COMPRESSION_QUALITY,
  				  0, 3, 1, S5P_JPEG_COMPR_QUAL_WORST);
  
  		v4l2_ctrl_new_std(&ctx->ctrl_handler, &s5p_jpeg_ctrl_ops,
  				  V4L2_CID_JPEG_RESTART_INTERVAL,
  				  0, 3, 0xffff, 0);
  		if (ctx->jpeg->variant->version == SJPEG_S5P)
  			mask = ~0x06; /* 422, 420 */
  	}
  
  	ctrl = v4l2_ctrl_new_std_menu(&ctx->ctrl_handler, &s5p_jpeg_ctrl_ops,
  				      V4L2_CID_JPEG_CHROMA_SUBSAMPLING,
  				      V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY, mask,
  				      V4L2_JPEG_CHROMA_SUBSAMPLING_422);
  
  	if (ctx->ctrl_handler.error) {
  		ret = ctx->ctrl_handler.error;
  		goto error_free;
  	}
  
  	if (ctx->mode == S5P_JPEG_DECODE)
  		ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE |
  			V4L2_CTRL_FLAG_READ_ONLY;
  
  	ret = v4l2_ctrl_handler_setup(&ctx->ctrl_handler);
  	if (ret < 0)
  		goto error_free;
  
  	return ret;
  
  error_free:
  	v4l2_ctrl_handler_free(&ctx->ctrl_handler);
  	return ret;
  }
  
  static const struct v4l2_ioctl_ops s5p_jpeg_ioctl_ops = {
  	.vidioc_querycap		= s5p_jpeg_querycap,
  
  	.vidioc_enum_fmt_vid_cap	= s5p_jpeg_enum_fmt_vid_cap,
  	.vidioc_enum_fmt_vid_out	= s5p_jpeg_enum_fmt_vid_out,
  
  	.vidioc_g_fmt_vid_cap		= s5p_jpeg_g_fmt,
  	.vidioc_g_fmt_vid_out		= s5p_jpeg_g_fmt,
  
  	.vidioc_try_fmt_vid_cap		= s5p_jpeg_try_fmt_vid_cap,
  	.vidioc_try_fmt_vid_out		= s5p_jpeg_try_fmt_vid_out,
  
  	.vidioc_s_fmt_vid_cap		= s5p_jpeg_s_fmt_vid_cap,
  	.vidioc_s_fmt_vid_out		= s5p_jpeg_s_fmt_vid_out,
  
  	.vidioc_reqbufs			= v4l2_m2m_ioctl_reqbufs,
  	.vidioc_querybuf		= v4l2_m2m_ioctl_querybuf,
  	.vidioc_qbuf			= v4l2_m2m_ioctl_qbuf,
  	.vidioc_dqbuf			= v4l2_m2m_ioctl_dqbuf,
  
  	.vidioc_streamon		= v4l2_m2m_ioctl_streamon,
  	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
  
  	.vidioc_g_selection		= s5p_jpeg_g_selection,
  	.vidioc_s_selection		= s5p_jpeg_s_selection,
  };
  
  /*
   * ============================================================================
   * mem2mem callbacks
   * ============================================================================
   */
  
  static void s5p_jpeg_device_run(void *priv)
  {
  	struct s5p_jpeg_ctx *ctx = priv;
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct vb2_buffer *src_buf, *dst_buf;
  	unsigned long src_addr, dst_addr, flags;
  
  	spin_lock_irqsave(&ctx->jpeg->slock, flags);
  
  	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  	src_addr = vb2_dma_contig_plane_dma_addr(src_buf, 0);
  	dst_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
  
  	s5p_jpeg_reset(jpeg->regs);
  	s5p_jpeg_poweron(jpeg->regs);
  	s5p_jpeg_proc_mode(jpeg->regs, ctx->mode);
  	if (ctx->mode == S5P_JPEG_ENCODE) {
  		if (ctx->out_q.fmt->fourcc == V4L2_PIX_FMT_RGB565)
  			s5p_jpeg_input_raw_mode(jpeg->regs,
  							S5P_JPEG_RAW_IN_565);
  		else
  			s5p_jpeg_input_raw_mode(jpeg->regs,
  							S5P_JPEG_RAW_IN_422);
  		s5p_jpeg_subsampling_mode(jpeg->regs, ctx->subsampling);
  		s5p_jpeg_dri(jpeg->regs, ctx->restart_interval);
  		s5p_jpeg_x(jpeg->regs, ctx->out_q.w);
  		s5p_jpeg_y(jpeg->regs, ctx->out_q.h);
  		s5p_jpeg_imgadr(jpeg->regs, src_addr);
  		s5p_jpeg_jpgadr(jpeg->regs, dst_addr);
  
  		/* ultimately comes from sizeimage from userspace */
  		s5p_jpeg_enc_stream_int(jpeg->regs, ctx->cap_q.size);
  
  		/* JPEG RGB to YCbCr conversion matrix */
  		s5p_jpeg_coef(jpeg->regs, 1, 1, S5P_JPEG_COEF11);
  		s5p_jpeg_coef(jpeg->regs, 1, 2, S5P_JPEG_COEF12);
  		s5p_jpeg_coef(jpeg->regs, 1, 3, S5P_JPEG_COEF13);
  		s5p_jpeg_coef(jpeg->regs, 2, 1, S5P_JPEG_COEF21);
  		s5p_jpeg_coef(jpeg->regs, 2, 2, S5P_JPEG_COEF22);
  		s5p_jpeg_coef(jpeg->regs, 2, 3, S5P_JPEG_COEF23);
  		s5p_jpeg_coef(jpeg->regs, 3, 1, S5P_JPEG_COEF31);
  		s5p_jpeg_coef(jpeg->regs, 3, 2, S5P_JPEG_COEF32);
  		s5p_jpeg_coef(jpeg->regs, 3, 3, S5P_JPEG_COEF33);
  
  		/*
  		 * JPEG IP allows storing 4 quantization tables
  		 * We fill table 0 for luma and table 1 for chroma
  		 */
  		s5p_jpeg_set_qtbl_lum(jpeg->regs, ctx->compr_quality);
  		s5p_jpeg_set_qtbl_chr(jpeg->regs, ctx->compr_quality);
  		/* use table 0 for Y */
  		s5p_jpeg_qtbl(jpeg->regs, 1, 0);
  		/* use table 1 for Cb and Cr*/
  		s5p_jpeg_qtbl(jpeg->regs, 2, 1);
  		s5p_jpeg_qtbl(jpeg->regs, 3, 1);
  
  		/* Y, Cb, Cr use Huffman table 0 */
  		s5p_jpeg_htbl_ac(jpeg->regs, 1);
  		s5p_jpeg_htbl_dc(jpeg->regs, 1);
  		s5p_jpeg_htbl_ac(jpeg->regs, 2);
  		s5p_jpeg_htbl_dc(jpeg->regs, 2);
  		s5p_jpeg_htbl_ac(jpeg->regs, 3);
  		s5p_jpeg_htbl_dc(jpeg->regs, 3);
  	} else { /* S5P_JPEG_DECODE */
  		s5p_jpeg_rst_int_enable(jpeg->regs, true);
  		s5p_jpeg_data_num_int_enable(jpeg->regs, true);
  		s5p_jpeg_final_mcu_num_int_enable(jpeg->regs, true);
  		if (ctx->cap_q.fmt->fourcc == V4L2_PIX_FMT_YUYV)
  			s5p_jpeg_outform_raw(jpeg->regs, S5P_JPEG_RAW_OUT_422);
  		else
  			s5p_jpeg_outform_raw(jpeg->regs, S5P_JPEG_RAW_OUT_420);
  		s5p_jpeg_jpgadr(jpeg->regs, src_addr);
  		s5p_jpeg_imgadr(jpeg->regs, dst_addr);
  	}
  
  	s5p_jpeg_start(jpeg->regs);
  
  	spin_unlock_irqrestore(&ctx->jpeg->slock, flags);
  }
  
  static void exynos4_jpeg_set_img_addr(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct s5p_jpeg_fmt *fmt;
  	struct vb2_buffer *vb;
  	struct s5p_jpeg_addr jpeg_addr = {};
  	u32 pix_size, padding_bytes = 0;
  
  	jpeg_addr.cb = 0;
  	jpeg_addr.cr = 0;
  
  	pix_size = ctx->cap_q.w * ctx->cap_q.h;
  
  	if (ctx->mode == S5P_JPEG_ENCODE) {
  		vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  		fmt = ctx->out_q.fmt;
  		if (ctx->out_q.w % 2 && fmt->h_align > 0)
  			padding_bytes = ctx->out_q.h;
  	} else {
  		fmt = ctx->cap_q.fmt;
  		vb = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  	}
  
  	jpeg_addr.y = vb2_dma_contig_plane_dma_addr(vb, 0);
  
  	if (fmt->colplanes == 2) {
  		jpeg_addr.cb = jpeg_addr.y + pix_size - padding_bytes;
  	} else if (fmt->colplanes == 3) {
  		jpeg_addr.cb = jpeg_addr.y + pix_size;
  		if (fmt->fourcc == V4L2_PIX_FMT_YUV420)
  			jpeg_addr.cr = jpeg_addr.cb + pix_size / 4;
  		else
  			jpeg_addr.cr = jpeg_addr.cb + pix_size / 2;
  	}
  
  	exynos4_jpeg_set_frame_buf_address(jpeg->regs, &jpeg_addr);
  }
  
  static void exynos4_jpeg_set_jpeg_addr(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct vb2_buffer *vb;
  	unsigned int jpeg_addr = 0;
  
  	if (ctx->mode == S5P_JPEG_ENCODE)
  		vb = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  	else
  		vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  
  	jpeg_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
  	if (jpeg->variant->version == SJPEG_EXYNOS5433 &&
  	    ctx->mode == S5P_JPEG_DECODE)
  		jpeg_addr += ctx->out_q.sos;
  	exynos4_jpeg_set_stream_buf_address(jpeg->regs, jpeg_addr);
  }
  
  static inline void exynos4_jpeg_set_img_fmt(void __iomem *base,
  					    unsigned int img_fmt)
  {
  	__exynos4_jpeg_set_img_fmt(base, img_fmt, SJPEG_EXYNOS4);
  }
  
  static inline void exynos5433_jpeg_set_img_fmt(void __iomem *base,
  					       unsigned int img_fmt)
  {
  	__exynos4_jpeg_set_img_fmt(base, img_fmt, SJPEG_EXYNOS5433);
  }
  
  static inline void exynos4_jpeg_set_enc_out_fmt(void __iomem *base,
  						unsigned int out_fmt)
  {
  	__exynos4_jpeg_set_enc_out_fmt(base, out_fmt, SJPEG_EXYNOS4);
  }
  
  static inline void exynos5433_jpeg_set_enc_out_fmt(void __iomem *base,
  						   unsigned int out_fmt)
  {
  	__exynos4_jpeg_set_enc_out_fmt(base, out_fmt, SJPEG_EXYNOS5433);
  }
  
  static void exynos4_jpeg_device_run(void *priv)
  {
  	struct s5p_jpeg_ctx *ctx = priv;
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	unsigned int bitstream_size;
  	unsigned long flags;
  
  	spin_lock_irqsave(&jpeg->slock, flags);
  
  	if (ctx->mode == S5P_JPEG_ENCODE) {
  		exynos4_jpeg_sw_reset(jpeg->regs);
  		exynos4_jpeg_set_interrupt(jpeg->regs, jpeg->variant->version);
  		exynos4_jpeg_set_huf_table_enable(jpeg->regs, 1);
  
  		exynos4_jpeg_set_huff_tbl(jpeg->regs);
  
  		/*
  		 * JPEG IP allows storing 4 quantization tables
  		 * We fill table 0 for luma and table 1 for chroma
  		 */
  		exynos4_jpeg_set_qtbl_lum(jpeg->regs, ctx->compr_quality);
  		exynos4_jpeg_set_qtbl_chr(jpeg->regs, ctx->compr_quality);
  
  		exynos4_jpeg_set_encode_tbl_select(jpeg->regs,
  							ctx->compr_quality);
  		exynos4_jpeg_set_stream_size(jpeg->regs, ctx->cap_q.w,
  							ctx->cap_q.h);
  
  		if (ctx->jpeg->variant->version == SJPEG_EXYNOS4) {
  			exynos4_jpeg_set_enc_out_fmt(jpeg->regs,
  						     ctx->subsampling);
  			exynos4_jpeg_set_img_fmt(jpeg->regs,
  						 ctx->out_q.fmt->fourcc);
  		} else {
  			exynos5433_jpeg_set_enc_out_fmt(jpeg->regs,
  							ctx->subsampling);
  			exynos5433_jpeg_set_img_fmt(jpeg->regs,
  						    ctx->out_q.fmt->fourcc);
  		}
  		exynos4_jpeg_set_img_addr(ctx);
  		exynos4_jpeg_set_jpeg_addr(ctx);
  		exynos4_jpeg_set_encode_hoff_cnt(jpeg->regs,
  							ctx->out_q.fmt->fourcc);
  	} else {
  		exynos4_jpeg_sw_reset(jpeg->regs);
  		exynos4_jpeg_set_interrupt(jpeg->regs,
  					   jpeg->variant->version);
  		exynos4_jpeg_set_img_addr(ctx);
  		exynos4_jpeg_set_jpeg_addr(ctx);
  
  		if (jpeg->variant->version == SJPEG_EXYNOS5433) {
  			exynos4_jpeg_parse_huff_tbl(ctx);
  			exynos4_jpeg_parse_decode_h_tbl(ctx);
  
  			exynos4_jpeg_parse_q_tbl(ctx);
  			exynos4_jpeg_parse_decode_q_tbl(ctx);
  
  			exynos4_jpeg_set_huf_table_enable(jpeg->regs, 1);
  
  			exynos4_jpeg_set_stream_size(jpeg->regs, ctx->cap_q.w,
  					ctx->cap_q.h);
  			exynos5433_jpeg_set_enc_out_fmt(jpeg->regs,
  							ctx->subsampling);
  			exynos5433_jpeg_set_img_fmt(jpeg->regs,
  						    ctx->cap_q.fmt->fourcc);
  			bitstream_size = DIV_ROUND_UP(ctx->out_q.size, 16);
  		} else {
  			exynos4_jpeg_set_img_fmt(jpeg->regs,
  						 ctx->cap_q.fmt->fourcc);
  			bitstream_size = DIV_ROUND_UP(ctx->out_q.size, 32);
  		}
  
  		exynos4_jpeg_set_dec_bitstream_size(jpeg->regs, bitstream_size);
  	}
  
  	exynos4_jpeg_set_enc_dec_mode(jpeg->regs, ctx->mode);
  
  	spin_unlock_irqrestore(&jpeg->slock, flags);
  }
  
  static void exynos3250_jpeg_set_img_addr(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct s5p_jpeg_fmt *fmt;
  	struct vb2_buffer *vb;
  	struct s5p_jpeg_addr jpeg_addr = {};
  	u32 pix_size;
  
  	pix_size = ctx->cap_q.w * ctx->cap_q.h;
  
  	if (ctx->mode == S5P_JPEG_ENCODE) {
  		vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  		fmt = ctx->out_q.fmt;
  	} else {
  		vb = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  		fmt = ctx->cap_q.fmt;
  	}
  
  	jpeg_addr.y = vb2_dma_contig_plane_dma_addr(vb, 0);
  
  	if (fmt->colplanes == 2) {
  		jpeg_addr.cb = jpeg_addr.y + pix_size;
  	} else if (fmt->colplanes == 3) {
  		jpeg_addr.cb = jpeg_addr.y + pix_size;
  		if (fmt->fourcc == V4L2_PIX_FMT_YUV420)
  			jpeg_addr.cr = jpeg_addr.cb + pix_size / 4;
  		else
  			jpeg_addr.cr = jpeg_addr.cb + pix_size / 2;
  	}
  
  	exynos3250_jpeg_imgadr(jpeg->regs, &jpeg_addr);
  }
  
  static void exynos3250_jpeg_set_jpeg_addr(struct s5p_jpeg_ctx *ctx)
  {
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	struct vb2_buffer *vb;
  	unsigned int jpeg_addr = 0;
  
  	if (ctx->mode == S5P_JPEG_ENCODE)
  		vb = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  	else
  		vb = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  
  	jpeg_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
  	exynos3250_jpeg_jpgadr(jpeg->regs, jpeg_addr);
  }
  
  static void exynos3250_jpeg_device_run(void *priv)
  {
  	struct s5p_jpeg_ctx *ctx = priv;
  	struct s5p_jpeg *jpeg = ctx->jpeg;
  	unsigned long flags;
  
  	spin_lock_irqsave(&ctx->jpeg->slock, flags);
  
  	exynos3250_jpeg_reset(jpeg->regs);
  	exynos3250_jpeg_set_dma_num(jpeg->regs);
  	exynos3250_jpeg_poweron(jpeg->regs);
  	exynos3250_jpeg_clk_set(jpeg->regs);
  	exynos3250_jpeg_proc_mode(jpeg->regs, ctx->mode);
  
  	if (ctx->mode == S5P_JPEG_ENCODE) {
  		exynos3250_jpeg_input_raw_fmt(jpeg->regs,
  					      ctx->out_q.fmt->fourcc);
  		exynos3250_jpeg_dri(jpeg->regs, ctx->restart_interval);
  
  		/*
  		 * JPEG IP allows storing 4 quantization tables
  		 * We fill table 0 for luma and table 1 for chroma
  		 */
  		s5p_jpeg_set_qtbl_lum(jpeg->regs, ctx->compr_quality);
  		s5p_jpeg_set_qtbl_chr(jpeg->regs, ctx->compr_quality);
  		/* use table 0 for Y */
  		exynos3250_jpeg_qtbl(jpeg->regs, 1, 0);
  		/* use table 1 for Cb and Cr*/
  		exynos3250_jpeg_qtbl(jpeg->regs, 2, 1);
  		exynos3250_jpeg_qtbl(jpeg->regs, 3, 1);
  
  		/*
  		 * Some SoCs require setting Huffman tables before each run
  		 */
  		if (jpeg->variant->htbl_reinit) {
  			s5p_jpeg_set_hdctbl(jpeg->regs);
  			s5p_jpeg_set_hdctblg(jpeg->regs);
  			s5p_jpeg_set_hactbl(jpeg->regs);
  			s5p_jpeg_set_hactblg(jpeg->regs);
  		}
  
  		/* Y, Cb, Cr use Huffman table 0 */
  		exynos3250_jpeg_htbl_ac(jpeg->regs, 1);
  		exynos3250_jpeg_htbl_dc(jpeg->regs, 1);
  		exynos3250_jpeg_htbl_ac(jpeg->regs, 2);
  		exynos3250_jpeg_htbl_dc(jpeg->regs, 2);
  		exynos3250_jpeg_htbl_ac(jpeg->regs, 3);
  		exynos3250_jpeg_htbl_dc(jpeg->regs, 3);
  
  		exynos3250_jpeg_set_x(jpeg->regs, ctx->crop_rect.width);
  		exynos3250_jpeg_set_y(jpeg->regs, ctx->crop_rect.height);
  		exynos3250_jpeg_stride(jpeg->regs, ctx->out_q.fmt->fourcc,
  								ctx->out_q.w);
  		exynos3250_jpeg_offset(jpeg->regs, ctx->crop_rect.left,
  							ctx->crop_rect.top);
  		exynos3250_jpeg_set_img_addr(ctx);
  		exynos3250_jpeg_set_jpeg_addr(ctx);
  		exynos3250_jpeg_subsampling_mode(jpeg->regs, ctx->subsampling);
  
  		/* ultimately comes from sizeimage from userspace */
  		exynos3250_jpeg_enc_stream_bound(jpeg->regs, ctx->cap_q.size);
  
  		if (ctx->out_q.fmt->fourcc == V4L2_PIX_FMT_RGB565 ||
  		    ctx->out_q.fmt->fourcc == V4L2_PIX_FMT_RGB565X ||
  		    ctx->out_q.fmt->fourcc == V4L2_PIX_FMT_RGB32)
  			exynos3250_jpeg_set_y16(jpeg->regs, true);
  	} else {
  		exynos3250_jpeg_set_img_addr(ctx);
  		exynos3250_jpeg_set_jpeg_addr(ctx);
  		exynos3250_jpeg_stride(jpeg->regs, ctx->cap_q.fmt->fourcc,
  								ctx->cap_q.w);
  		exynos3250_jpeg_offset(jpeg->regs, 0, 0);
  		exynos3250_jpeg_dec_scaling_ratio(jpeg->regs,
  							ctx->scale_factor);
  		exynos3250_jpeg_dec_stream_size(jpeg->regs, ctx->out_q.size);
  		exynos3250_jpeg_output_raw_fmt(jpeg->regs,
  						ctx->cap_q.fmt->fourcc);
  	}
  
  	exynos3250_jpeg_interrupts_enable(jpeg->regs);
  
  	/* JPEG RGB to YCbCr conversion matrix */
  	exynos3250_jpeg_coef(jpeg->regs, ctx->mode);
  
  	exynos3250_jpeg_set_timer(jpeg->regs, EXYNOS3250_IRQ_TIMEOUT);
  	jpeg->irq_status = 0;
  	exynos3250_jpeg_start(jpeg->regs);
  
  	spin_unlock_irqrestore(&ctx->jpeg->slock, flags);
  }
  
  static int s5p_jpeg_job_ready(void *priv)
  {
  	struct s5p_jpeg_ctx *ctx = priv;
  
  	if (ctx->mode == S5P_JPEG_DECODE)
  		return ctx->hdr_parsed;
  	return 1;
  }
  
  static void s5p_jpeg_job_abort(void *priv)
  {
  }
  
  static struct v4l2_m2m_ops s5p_jpeg_m2m_ops = {
  	.device_run	= s5p_jpeg_device_run,
  	.job_ready	= s5p_jpeg_job_ready,
  	.job_abort	= s5p_jpeg_job_abort,
  };
  
  static struct v4l2_m2m_ops exynos3250_jpeg_m2m_ops = {
  	.device_run	= exynos3250_jpeg_device_run,
  	.job_ready	= s5p_jpeg_job_ready,
  	.job_abort	= s5p_jpeg_job_abort,
  };
  
  static struct v4l2_m2m_ops exynos4_jpeg_m2m_ops = {
  	.device_run	= exynos4_jpeg_device_run,
  	.job_ready	= s5p_jpeg_job_ready,
  	.job_abort	= s5p_jpeg_job_abort,
  };
  
  /*
   * ============================================================================
   * Queue operations
   * ============================================================================
   */
  
  static int s5p_jpeg_queue_setup(struct vb2_queue *vq,
  			   unsigned int *nbuffers, unsigned int *nplanes,
  			   unsigned int sizes[], struct device *alloc_devs[])
  {
  	struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(vq);
  	struct s5p_jpeg_q_data *q_data = NULL;
  	unsigned int size, count = *nbuffers;
  
  	q_data = get_q_data(ctx, vq->type);
  	BUG_ON(q_data == NULL);
  
  	size = q_data->size;
  
  	/*
  	 * header is parsed during decoding and parsed information stored
  	 * in the context so we do not allow another buffer to overwrite it
  	 */
  	if (ctx->mode == S5P_JPEG_DECODE)
  		count = 1;
  
  	*nbuffers = count;
  	*nplanes = 1;
  	sizes[0] = size;
  
  	return 0;
  }
  
  static int s5p_jpeg_buf_prepare(struct vb2_buffer *vb)
  {
  	struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  	struct s5p_jpeg_q_data *q_data = NULL;
  
  	q_data = get_q_data(ctx, vb->vb2_queue->type);
  	BUG_ON(q_data == NULL);
  
  	if (vb2_plane_size(vb, 0) < q_data->size) {
  		pr_err("%s data will not fit into plane (%lu < %lu)\n",
  				__func__, vb2_plane_size(vb, 0),
  				(long)q_data->size);
  		return -EINVAL;
  	}
  
  	vb2_set_plane_payload(vb, 0, q_data->size);
  
  	return 0;
  }
  
  static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  
  	if (ctx->mode == S5P_JPEG_DECODE &&
  	    vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
  		struct s5p_jpeg_q_data tmp, *q_data;
  
  		ctx->hdr_parsed = s5p_jpeg_parse_hdr(&tmp,
  		     (unsigned long)vb2_plane_vaddr(vb, 0),
  		     min((unsigned long)ctx->out_q.size,
  			 vb2_get_plane_payload(vb, 0)), ctx);
  		if (!ctx->hdr_parsed) {
  			vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
  			return;
  		}
  
  		q_data = &ctx->out_q;
  		q_data->w = tmp.w;
  		q_data->h = tmp.h;
  		q_data->sos = tmp.sos;
  		memcpy(q_data->dht.marker, tmp.dht.marker,
  		       sizeof(tmp.dht.marker));
  		memcpy(q_data->dht.len, tmp.dht.len, sizeof(tmp.dht.len));
  		q_data->dht.n = tmp.dht.n;
  		memcpy(q_data->dqt.marker, tmp.dqt.marker,
  		       sizeof(tmp.dqt.marker));
  		memcpy(q_data->dqt.len, tmp.dqt.len, sizeof(tmp.dqt.len));
  		q_data->dqt.n = tmp.dqt.n;
  		q_data->sof = tmp.sof;
  		q_data->sof_len = tmp.sof_len;
  
  		q_data = &ctx->cap_q;
  		q_data->w = tmp.w;
  		q_data->h = tmp.h;
  	}
  
  	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
  }
  
  static int s5p_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
  {
  	struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(q);
  	int ret;
  
  	ret = pm_runtime_get_sync(ctx->jpeg->dev);
  
  	return ret > 0 ? 0 : ret;
  }
  
  static void s5p_jpeg_stop_streaming(struct vb2_queue *q)
  {
  	struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(q);
  
  	pm_runtime_put(ctx->jpeg->dev);
  }
  
  static const struct vb2_ops s5p_jpeg_qops = {
  	.queue_setup		= s5p_jpeg_queue_setup,
  	.buf_prepare		= s5p_jpeg_buf_prepare,
  	.buf_queue		= s5p_jpeg_buf_queue,
  	.wait_prepare		= vb2_ops_wait_prepare,
  	.wait_finish		= vb2_ops_wait_finish,
  	.start_streaming	= s5p_jpeg_start_streaming,
  	.stop_streaming		= s5p_jpeg_stop_streaming,
  };
  
  static int queue_init(void *priv, struct vb2_queue *src_vq,
  		      struct vb2_queue *dst_vq)
  {
  	struct s5p_jpeg_ctx *ctx = priv;
  	int ret;
  
  	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
  	src_vq->io_modes = VB2_MMAP | VB2_USERPTR;
  	src_vq->drv_priv = ctx;
  	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
  	src_vq->ops = &s5p_jpeg_qops;
  	src_vq->mem_ops = &vb2_dma_contig_memops;
  	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
  	src_vq->lock = &ctx->jpeg->lock;
  	src_vq->dev = ctx->jpeg->dev;
  
  	ret = vb2_queue_init(src_vq);
  	if (ret)
  		return ret;
  
  	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  	dst_vq->io_modes = VB2_MMAP | VB2_USERPTR;
  	dst_vq->drv_priv = ctx;
  	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
  	dst_vq->ops = &s5p_jpeg_qops;
  	dst_vq->mem_ops = &vb2_dma_contig_memops;
  	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
  	dst_vq->lock = &ctx->jpeg->lock;
  	dst_vq->dev = ctx->jpeg->dev;
  
  	return vb2_queue_init(dst_vq);
  }
  
  /*
   * ============================================================================
   * ISR
   * ============================================================================
   */
  
  static irqreturn_t s5p_jpeg_irq(int irq, void *dev_id)
  {
  	struct s5p_jpeg *jpeg = dev_id;
  	struct s5p_jpeg_ctx *curr_ctx;
  	struct vb2_v4l2_buffer *src_buf, *dst_buf;
  	unsigned long payload_size = 0;
  	enum vb2_buffer_state state = VB2_BUF_STATE_DONE;
  	bool enc_jpeg_too_large = false;
  	bool timer_elapsed = false;
  	bool op_completed = false;
  
  	spin_lock(&jpeg->slock);
  
  	curr_ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
  
  	src_buf = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
  	dst_buf = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
  
  	if (curr_ctx->mode == S5P_JPEG_ENCODE)
  		enc_jpeg_too_large = s5p_jpeg_enc_stream_stat(jpeg->regs);
  	timer_elapsed = s5p_jpeg_timer_stat(jpeg->regs);
  	op_completed = s5p_jpeg_result_stat_ok(jpeg->regs);
  	if (curr_ctx->mode == S5P_JPEG_DECODE)
  		op_completed = op_completed &&
  					s5p_jpeg_stream_stat_ok(jpeg->regs);
  
  	if (enc_jpeg_too_large) {
  		state = VB2_BUF_STATE_ERROR;
  		s5p_jpeg_clear_enc_stream_stat(jpeg->regs);
  	} else if (timer_elapsed) {
  		state = VB2_BUF_STATE_ERROR;
  		s5p_jpeg_clear_timer_stat(jpeg->regs);
  	} else if (!op_completed) {
  		state = VB2_BUF_STATE_ERROR;
  	} else {
  		payload_size = s5p_jpeg_compressed_size(jpeg->regs);
  	}
  
  	dst_buf->timecode = src_buf->timecode;
  	dst_buf->vb2_buf.timestamp = src_buf->vb2_buf.timestamp;
  	dst_buf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
  	dst_buf->flags |=
  		src_buf->flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
  
  	v4l2_m2m_buf_done(src_buf, state);
  	if (curr_ctx->mode == S5P_JPEG_ENCODE)
  		vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload_size);
  	v4l2_m2m_buf_done(dst_buf, state);
  
  	curr_ctx->subsampling = s5p_jpeg_get_subsampling_mode(jpeg->regs);
  	spin_unlock(&jpeg->slock);
  
  	s5p_jpeg_clear_int(jpeg->regs);
  
  	v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
  	return IRQ_HANDLED;
  }
  
  static irqreturn_t exynos4_jpeg_irq(int irq, void *priv)
  {
  	unsigned int int_status;
  	struct vb2_v4l2_buffer *src_vb, *dst_vb;
  	struct s5p_jpeg *jpeg = priv;
  	struct s5p_jpeg_ctx *curr_ctx;
  	unsigned long payload_size = 0;
  
  	spin_lock(&jpeg->slock);
  
  	curr_ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
  
  	src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
  	dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
  
  	int_status = exynos4_jpeg_get_int_status(jpeg->regs);
  
  	if (int_status) {
  		switch (int_status & 0x1f) {
  		case 0x1:
  			jpeg->irq_ret = ERR_PROT;
  			break;
  		case 0x2:
  			jpeg->irq_ret = OK_ENC_OR_DEC;
  			break;
  		case 0x4:
  			jpeg->irq_ret = ERR_DEC_INVALID_FORMAT;
  			break;
  		case 0x8:
  			jpeg->irq_ret = ERR_MULTI_SCAN;
  			break;
  		case 0x10:
  			jpeg->irq_ret = ERR_FRAME;
  			break;
  		default:
  			jpeg->irq_ret = ERR_UNKNOWN;
  			break;
  		}
  	} else {
  		jpeg->irq_ret = ERR_UNKNOWN;
  	}
  
  	if (jpeg->irq_ret == OK_ENC_OR_DEC) {
  		if (curr_ctx->mode == S5P_JPEG_ENCODE) {
  			payload_size = exynos4_jpeg_get_stream_size(jpeg->regs);
  			vb2_set_plane_payload(&dst_vb->vb2_buf,
  					0, payload_size);
  		}
  		v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
  		v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
  	} else {
  		v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_ERROR);
  		v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_ERROR);
  	}
  
  	if (jpeg->variant->version == SJPEG_EXYNOS4)
  		curr_ctx->subsampling = exynos4_jpeg_get_frame_fmt(jpeg->regs);
  
  	spin_unlock(&jpeg->slock);
  
  	v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
  	return IRQ_HANDLED;
  }
  
  static irqreturn_t exynos3250_jpeg_irq(int irq, void *dev_id)
  {
  	struct s5p_jpeg *jpeg = dev_id;
  	struct s5p_jpeg_ctx *curr_ctx;
  	struct vb2_v4l2_buffer *src_buf, *dst_buf;
  	unsigned long payload_size = 0;
  	enum vb2_buffer_state state = VB2_BUF_STATE_DONE;
  	bool interrupt_timeout = false;
  	u32 irq_status;
  
  	spin_lock(&jpeg->slock);
  
  	irq_status = exynos3250_jpeg_get_timer_status(jpeg->regs);
  	if (irq_status & EXYNOS3250_TIMER_INT_STAT) {
  		exynos3250_jpeg_clear_timer_status(jpeg->regs);
  		interrupt_timeout = true;
  		dev_err(jpeg->dev, "Interrupt timeout occurred.\n");
  	}
  
  	irq_status = exynos3250_jpeg_get_int_status(jpeg->regs);
  	exynos3250_jpeg_clear_int_status(jpeg->regs, irq_status);
  
  	jpeg->irq_status |= irq_status;
  
  	curr_ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
  
  	if (!curr_ctx)
  		goto exit_unlock;
  
  	if ((irq_status & EXYNOS3250_HEADER_STAT) &&
  	    (curr_ctx->mode == S5P_JPEG_DECODE)) {
  		exynos3250_jpeg_rstart(jpeg->regs);
  		goto exit_unlock;
  	}
  
  	if (jpeg->irq_status & (EXYNOS3250_JPEG_DONE |
  				EXYNOS3250_WDMA_DONE |
  				EXYNOS3250_RDMA_DONE |
  				EXYNOS3250_RESULT_STAT))
  		payload_size = exynos3250_jpeg_compressed_size(jpeg->regs);
  	else if (interrupt_timeout)
  		state = VB2_BUF_STATE_ERROR;
  	else
  		goto exit_unlock;
  
  	src_buf = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
  	dst_buf = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
  
  	dst_buf->timecode = src_buf->timecode;
  	dst_buf->vb2_buf.timestamp = src_buf->vb2_buf.timestamp;
  
  	v4l2_m2m_buf_done(src_buf, state);
  	if (curr_ctx->mode == S5P_JPEG_ENCODE)
  		vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload_size);
  	v4l2_m2m_buf_done(dst_buf, state);
  
  	curr_ctx->subsampling =
  			exynos3250_jpeg_get_subsampling_mode(jpeg->regs);
  
  	spin_unlock(&jpeg->slock);
  
  	v4l2_m2m_job_finish(jpeg->m2m_dev, curr_ctx->fh.m2m_ctx);
  	return IRQ_HANDLED;
  
  exit_unlock:
  	spin_unlock(&jpeg->slock);
  	return IRQ_HANDLED;
  }
  
  static void *jpeg_get_drv_data(struct device *dev);
  
  /*
   * ============================================================================
   * Driver basic infrastructure
   * ============================================================================
   */
  
  static int s5p_jpeg_probe(struct platform_device *pdev)
  {
  	struct s5p_jpeg *jpeg;
  	struct resource *res;
  	int i, ret;
  
  	/* JPEG IP abstraction struct */
  	jpeg = devm_kzalloc(&pdev->dev, sizeof(struct s5p_jpeg), GFP_KERNEL);
  	if (!jpeg)
  		return -ENOMEM;
  
  	jpeg->variant = jpeg_get_drv_data(&pdev->dev);
  
  	mutex_init(&jpeg->lock);
  	spin_lock_init(&jpeg->slock);
  	jpeg->dev = &pdev->dev;
  
  	/* memory-mapped registers */
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  
  	jpeg->regs = devm_ioremap_resource(&pdev->dev, res);
  	if (IS_ERR(jpeg->regs))
  		return PTR_ERR(jpeg->regs);
  
  	/* interrupt service routine registration */
  	jpeg->irq = ret = platform_get_irq(pdev, 0);
  	if (ret < 0) {
  		dev_err(&pdev->dev, "cannot find IRQ\n");
  		return ret;
  	}
  
  	ret = devm_request_irq(&pdev->dev, jpeg->irq, jpeg->variant->jpeg_irq,
  				0, dev_name(&pdev->dev), jpeg);
  	if (ret) {
  		dev_err(&pdev->dev, "cannot claim IRQ %d\n", jpeg->irq);
  		return ret;
  	}
  
  	/* clocks */
  	for (i = 0; i < jpeg->variant->num_clocks; i++) {
  		jpeg->clocks[i] = devm_clk_get(&pdev->dev,
  					      jpeg->variant->clk_names[i]);
  		if (IS_ERR(jpeg->clocks[i])) {
  			dev_err(&pdev->dev, "failed to get clock: %s\n",
  				jpeg->variant->clk_names[i]);
  			return PTR_ERR(jpeg->clocks[i]);
  		}
  	}
  
  	/* v4l2 device */
  	ret = v4l2_device_register(&pdev->dev, &jpeg->v4l2_dev);
  	if (ret) {
  		dev_err(&pdev->dev, "Failed to register v4l2 device\n");
  		return ret;
  	}
  
  	/* mem2mem device */
  	jpeg->m2m_dev = v4l2_m2m_init(jpeg->variant->m2m_ops);
  	if (IS_ERR(jpeg->m2m_dev)) {
  		v4l2_err(&jpeg->v4l2_dev, "Failed to init mem2mem device\n");
  		ret = PTR_ERR(jpeg->m2m_dev);
  		goto device_register_rollback;
  	}
  
  	vb2_dma_contig_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
  
  	/* JPEG encoder /dev/videoX node */
  	jpeg->vfd_encoder = video_device_alloc();
  	if (!jpeg->vfd_encoder) {
  		v4l2_err(&jpeg->v4l2_dev, "Failed to allocate video device\n");
  		ret = -ENOMEM;
  		goto m2m_init_rollback;
  	}
  	snprintf(jpeg->vfd_encoder->name, sizeof(jpeg->vfd_encoder->name),
  				"%s-enc", S5P_JPEG_M2M_NAME);
  	jpeg->vfd_encoder->fops		= &s5p_jpeg_fops;
  	jpeg->vfd_encoder->ioctl_ops	= &s5p_jpeg_ioctl_ops;
  	jpeg->vfd_encoder->minor	= -1;
  	jpeg->vfd_encoder->release	= video_device_release;
  	jpeg->vfd_encoder->lock		= &jpeg->lock;
  	jpeg->vfd_encoder->v4l2_dev	= &jpeg->v4l2_dev;
  	jpeg->vfd_encoder->vfl_dir	= VFL_DIR_M2M;
  
  	ret = video_register_device(jpeg->vfd_encoder, VFL_TYPE_GRABBER, -1);
  	if (ret) {
  		v4l2_err(&jpeg->v4l2_dev, "Failed to register video device\n");
  		video_device_release(jpeg->vfd_encoder);
  		goto m2m_init_rollback;
  	}
  
  	video_set_drvdata(jpeg->vfd_encoder, jpeg);
  	v4l2_info(&jpeg->v4l2_dev,
  		  "encoder device registered as /dev/video%d\n",
  		  jpeg->vfd_encoder->num);
  
  	/* JPEG decoder /dev/videoX node */
  	jpeg->vfd_decoder = video_device_alloc();
  	if (!jpeg->vfd_decoder) {
  		v4l2_err(&jpeg->v4l2_dev, "Failed to allocate video device\n");
  		ret = -ENOMEM;
  		goto enc_vdev_register_rollback;
  	}
  	snprintf(jpeg->vfd_decoder->name, sizeof(jpeg->vfd_decoder->name),
  				"%s-dec", S5P_JPEG_M2M_NAME);
  	jpeg->vfd_decoder->fops		= &s5p_jpeg_fops;
  	jpeg->vfd_decoder->ioctl_ops	= &s5p_jpeg_ioctl_ops;
  	jpeg->vfd_decoder->minor	= -1;
  	jpeg->vfd_decoder->release	= video_device_release;
  	jpeg->vfd_decoder->lock		= &jpeg->lock;
  	jpeg->vfd_decoder->v4l2_dev	= &jpeg->v4l2_dev;
  	jpeg->vfd_decoder->vfl_dir	= VFL_DIR_M2M;
  
  	ret = video_register_device(jpeg->vfd_decoder, VFL_TYPE_GRABBER, -1);
  	if (ret) {
  		v4l2_err(&jpeg->v4l2_dev, "Failed to register video device\n");
  		video_device_release(jpeg->vfd_decoder);
  		goto enc_vdev_register_rollback;
  	}
  
  	video_set_drvdata(jpeg->vfd_decoder, jpeg);
  	v4l2_info(&jpeg->v4l2_dev,
  		  "decoder device registered as /dev/video%d\n",
  		  jpeg->vfd_decoder->num);
  
  	/* final statements & power management */
  	platform_set_drvdata(pdev, jpeg);
  
  	pm_runtime_enable(&pdev->dev);
  
  	v4l2_info(&jpeg->v4l2_dev, "Samsung S5P JPEG codec\n");
  
  	return 0;
  
  enc_vdev_register_rollback:
  	video_unregister_device(jpeg->vfd_encoder);
  
  m2m_init_rollback:
  	v4l2_m2m_release(jpeg->m2m_dev);
  
  device_register_rollback:
  	v4l2_device_unregister(&jpeg->v4l2_dev);
  
  	return ret;
  }
  
  static int s5p_jpeg_remove(struct platform_device *pdev)
  {
  	struct s5p_jpeg *jpeg = platform_get_drvdata(pdev);
  	int i;
  
  	pm_runtime_disable(jpeg->dev);
  
  	video_unregister_device(jpeg->vfd_decoder);
  	video_unregister_device(jpeg->vfd_encoder);
  	vb2_dma_contig_clear_max_seg_size(&pdev->dev);
  	v4l2_m2m_release(jpeg->m2m_dev);
  	v4l2_device_unregister(&jpeg->v4l2_dev);
  
  	if (!pm_runtime_status_suspended(&pdev->dev)) {
  		for (i = jpeg->variant->num_clocks - 1; i >= 0; i--)
  			clk_disable_unprepare(jpeg->clocks[i]);
  	}
  
  	return 0;
  }
  
  #ifdef CONFIG_PM
  static int s5p_jpeg_runtime_suspend(struct device *dev)
  {
  	struct s5p_jpeg *jpeg = dev_get_drvdata(dev);
  	int i;
  
  	for (i = jpeg->variant->num_clocks - 1; i >= 0; i--)
  		clk_disable_unprepare(jpeg->clocks[i]);
  
  	return 0;
  }
  
  static int s5p_jpeg_runtime_resume(struct device *dev)
  {
  	struct s5p_jpeg *jpeg = dev_get_drvdata(dev);
  	unsigned long flags;
  	int i, ret;
  
  	for (i = 0; i < jpeg->variant->num_clocks; i++) {
  		ret = clk_prepare_enable(jpeg->clocks[i]);
  		if (ret) {
  			while (--i > 0)
  				clk_disable_unprepare(jpeg->clocks[i]);
  			return ret;
  		}
  	}
  
  	spin_lock_irqsave(&jpeg->slock, flags);
  
  	/*
  	 * JPEG IP allows storing two Huffman tables for each component.
  	 * We fill table 0 for each component and do this here only
  	 * for S5PC210 and Exynos3250 SoCs. Exynos4x12 and Exynos542x SoC
  	 * require programming their Huffman tables each time the encoding
  	 * process is initialized, and thus it is accomplished in the
  	 * device_run callback of m2m_ops.
  	 */
  	if (!jpeg->variant->htbl_reinit) {
  		s5p_jpeg_set_hdctbl(jpeg->regs);
  		s5p_jpeg_set_hdctblg(jpeg->regs);
  		s5p_jpeg_set_hactbl(jpeg->regs);
  		s5p_jpeg_set_hactblg(jpeg->regs);
  	}
  
  	spin_unlock_irqrestore(&jpeg->slock, flags);
  
  	return 0;
  }
  #endif /* CONFIG_PM */
  
  static const struct dev_pm_ops s5p_jpeg_pm_ops = {
  	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
  				pm_runtime_force_resume)
  	SET_RUNTIME_PM_OPS(s5p_jpeg_runtime_suspend, s5p_jpeg_runtime_resume,
  			   NULL)
  };
  
  static struct s5p_jpeg_variant s5p_jpeg_drvdata = {
  	.version	= SJPEG_S5P,
  	.jpeg_irq	= s5p_jpeg_irq,
  	.m2m_ops	= &s5p_jpeg_m2m_ops,
  	.fmt_ver_flag	= SJPEG_FMT_FLAG_S5P,
  	.clk_names	= {"jpeg"},
  	.num_clocks	= 1,
  };
  
  static struct s5p_jpeg_variant exynos3250_jpeg_drvdata = {
  	.version	= SJPEG_EXYNOS3250,
  	.jpeg_irq	= exynos3250_jpeg_irq,
  	.m2m_ops	= &exynos3250_jpeg_m2m_ops,
  	.fmt_ver_flag	= SJPEG_FMT_FLAG_EXYNOS3250,
  	.hw3250_compat	= 1,
  	.clk_names	= {"jpeg", "sclk"},
  	.num_clocks	= 2,
  };
  
  static struct s5p_jpeg_variant exynos4_jpeg_drvdata = {
  	.version	= SJPEG_EXYNOS4,
  	.jpeg_irq	= exynos4_jpeg_irq,
  	.m2m_ops	= &exynos4_jpeg_m2m_ops,
  	.fmt_ver_flag	= SJPEG_FMT_FLAG_EXYNOS4,
  	.htbl_reinit	= 1,
  	.clk_names	= {"jpeg"},
  	.num_clocks	= 1,
  	.hw_ex4_compat	= 1,
  };
  
  static struct s5p_jpeg_variant exynos5420_jpeg_drvdata = {
  	.version	= SJPEG_EXYNOS5420,
  	.jpeg_irq	= exynos3250_jpeg_irq,		/* intentionally 3250 */
  	.m2m_ops	= &exynos3250_jpeg_m2m_ops,	/* intentionally 3250 */
  	.fmt_ver_flag	= SJPEG_FMT_FLAG_EXYNOS3250,	/* intentionally 3250 */
  	.hw3250_compat	= 1,
  	.htbl_reinit	= 1,
  	.clk_names	= {"jpeg"},
  	.num_clocks	= 1,
  };
  
  static struct s5p_jpeg_variant exynos5433_jpeg_drvdata = {
  	.version	= SJPEG_EXYNOS5433,
  	.jpeg_irq	= exynos4_jpeg_irq,
  	.m2m_ops	= &exynos4_jpeg_m2m_ops,
  	.fmt_ver_flag	= SJPEG_FMT_FLAG_EXYNOS4,
  	.htbl_reinit	= 1,
  	.clk_names	= {"pclk", "aclk", "aclk_xiu", "sclk"},
  	.num_clocks	= 4,
  	.hw_ex4_compat	= 1,
  };
  
  static const struct of_device_id samsung_jpeg_match[] = {
  	{
  		.compatible = "samsung,s5pv210-jpeg",
  		.data = &s5p_jpeg_drvdata,
  	}, {
  		.compatible = "samsung,exynos3250-jpeg",
  		.data = &exynos3250_jpeg_drvdata,
  	}, {
  		.compatible = "samsung,exynos4210-jpeg",
  		.data = &exynos4_jpeg_drvdata,
  	}, {
  		.compatible = "samsung,exynos4212-jpeg",
  		.data = &exynos4_jpeg_drvdata,
  	}, {
  		.compatible = "samsung,exynos5420-jpeg",
  		.data = &exynos5420_jpeg_drvdata,
  	}, {
  		.compatible = "samsung,exynos5433-jpeg",
  		.data = &exynos5433_jpeg_drvdata,
  	},
  	{},
  };
  
  MODULE_DEVICE_TABLE(of, samsung_jpeg_match);
  
  static void *jpeg_get_drv_data(struct device *dev)
  {
  	struct s5p_jpeg_variant *driver_data = NULL;
  	const struct of_device_id *match;
  
  	if (!IS_ENABLED(CONFIG_OF) || !dev->of_node)
  		return &s5p_jpeg_drvdata;
  
  	match = of_match_node(samsung_jpeg_match, dev->of_node);
  
  	if (match)
  		driver_data = (struct s5p_jpeg_variant *)match->data;
  
  	return driver_data;
  }
  
  static struct platform_driver s5p_jpeg_driver = {
  	.probe = s5p_jpeg_probe,
  	.remove = s5p_jpeg_remove,
  	.driver = {
  		.of_match_table	= of_match_ptr(samsung_jpeg_match),
  		.name		= S5P_JPEG_M2M_NAME,
  		.pm		= &s5p_jpeg_pm_ops,
  	},
  };
  
  module_platform_driver(s5p_jpeg_driver);
  
  MODULE_AUTHOR("Andrzej Pietrasiewicz <andrzej.p@samsung.com>");
  MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
  MODULE_DESCRIPTION("Samsung JPEG codec driver");
  MODULE_LICENSE("GPL");
  