text: // SPDX-License-Identifier: GPL-2.0
  /*
   * V4L2 driver for the JPEG encoder/decoder from i.MX8QXP/i.MX8QM application
   * processors.
   *
   * The multi-planar buffers API is used.
   *
   * Baseline and extended sequential jpeg decoding is supported.
   * Progressive jpeg decoding is not supported by the IP.
   * Supports encode and decode of various formats:
   *     YUV444, YUV422, YUV420, RGB, ARGB, Gray
   * YUV420 is the only multi-planar format supported.
   * Minimum resolution is 64 x 64, maximum 8192 x 8192.
   * To achieve 8192 x 8192, modify in defconfig: CONFIG_CMA_SIZE_MBYTES=320
   * The alignment requirements for the resolution depend on the format,
   * multiple of 16 resolutions should work for all formats.
   * Special workarounds are made in the driver to support NV12 1080p.
   * When decoding, the driver detects image resolution and pixel format
   * from the jpeg stream, by parsing the jpeg markers.
   *
   * The IP has 4 slots available for context switching, but only slot 0
   * was fully tested to work. Context switching is not used by the driver.
   * Each driver instance (context) allocates a slot for itself, but this
   * is postponed until device_run, to allow unlimited opens.
   *
   * The driver submits jobs to the IP by setting up a descriptor for the
   * used slot, and then validating it. The encoder has an additional descriptor
   * for the configuration phase. The driver expects FRM_DONE interrupt from
   * IP to mark the job as finished.
   *
   * The decoder IP has some limitations regarding the component ID's,
   * but the driver works around this by replacing them in the jpeg stream.
   *
   * A module parameter is available for debug purpose (jpeg_tracing), to enable
   * it, enable dynamic debug for this module and:
   * echo 1 > /sys/module/mxc_jpeg_encdec/parameters/jpeg_tracing
   *
   * This is inspired by the drivers/media/platform/samsung/s5p-jpeg driver
   *
   * Copyright 2018-2019 NXP
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/io.h>
  #include <linux/clk.h>
  #include <linux/of_platform.h>
  #include <linux/platform_device.h>
  #include <linux/slab.h>
  #include <linux/irqreturn.h>
  #include <linux/interrupt.h>
  #include <linux/pm_runtime.h>
  #include <linux/pm_domain.h>
  #include <linux/string.h>
  
  #include <media/v4l2-jpeg.h>
  #include <media/v4l2-mem2mem.h>
  #include <media/v4l2-ioctl.h>
  #include <media/v4l2-common.h>
  #include <media/v4l2-event.h>
  #include <media/videobuf2-dma-contig.h>
  
  #include "mxc-jpeg-hw.h"
  #include "mxc-jpeg.h"
  
  static const struct mxc_jpeg_fmt mxc_formats[] = {
  	{
  		.name		= "JPEG",
  		.fourcc		= V4L2_PIX_FMT_JPEG,
  		.subsampling	= -1,
  		.nc		= -1,
  		.colplanes	= 1,
  		.flags		= MXC_JPEG_FMT_TYPE_ENC,
  	},
  	{
  		.name		= "RGB", /*RGBRGB packed format*/
  		.fourcc		= V4L2_PIX_FMT_RGB24,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  		.nc		= 3,
  		.depth		= 24,
  		.colplanes	= 1,
  		.h_align	= 3,
  		.v_align	= 3,
  		.flags		= MXC_JPEG_FMT_TYPE_RAW,
  	},
  	{
  		.name		= "ARGB", /* ARGBARGB packed format */
  		.fourcc		= V4L2_PIX_FMT_ARGB32,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  		.nc		= 4,
  		.depth		= 32,
  		.colplanes	= 1,
  		.h_align	= 3,
  		.v_align	= 3,
  		.flags		= MXC_JPEG_FMT_TYPE_RAW,
  	},
  	{
  		.name		= "YUV420", /* 1st plane = Y, 2nd plane = UV */
  		.fourcc		= V4L2_PIX_FMT_NV12M,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_420,
  		.nc		= 3,
  		.depth		= 12, /* 6 bytes (4Y + UV) for 4 pixels */
  		.colplanes	= 2, /* 1 plane Y, 1 plane UV interleaved */
  		.h_align	= 4,
  		.v_align	= 4,
  		.flags		= MXC_JPEG_FMT_TYPE_RAW,
  	},
  	{
  		.name		= "YUV422", /* YUYV */
  		.fourcc		= V4L2_PIX_FMT_YUYV,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_422,
  		.nc		= 3,
  		.depth		= 16,
  		.colplanes	= 1,
  		.h_align	= 4,
  		.v_align	= 3,
  		.flags		= MXC_JPEG_FMT_TYPE_RAW,
  	},
  	{
  		.name		= "YUV444", /* YUVYUV */
  		.fourcc		= V4L2_PIX_FMT_YUV24,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_444,
  		.nc		= 3,
  		.depth		= 24,
  		.colplanes	= 1,
  		.h_align	= 3,
  		.v_align	= 3,
  		.flags		= MXC_JPEG_FMT_TYPE_RAW,
  	},
  	{
  		.name		= "Gray", /* Gray (Y8/Y12) or Single Comp */
  		.fourcc		= V4L2_PIX_FMT_GREY,
  		.subsampling	= V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY,
  		.nc		= 1,
  		.depth		= 8,
  		.colplanes	= 1,
  		.h_align	= 3,
  		.v_align	= 3,
  		.flags		= MXC_JPEG_FMT_TYPE_RAW,
  	},
  };
  
  #define MXC_JPEG_NUM_FORMATS ARRAY_SIZE(mxc_formats)
  
  static const int mxc_decode_mode = MXC_JPEG_DECODE;
  static const int mxc_encode_mode = MXC_JPEG_ENCODE;
  
  static const struct of_device_id mxc_jpeg_match[] = {
  	{
  		.compatible = "nxp,imx8qxp-jpgdec",
  		.data       = &mxc_decode_mode,
  	},
  	{
  		.compatible = "nxp,imx8qxp-jpgenc",
  		.data       = &mxc_encode_mode,
  	},
  	{ },
  };
  
  /*
   * default configuration stream, 64x64 yuv422
   * split by JPEG marker, so it's easier to modify & use
   */
  static const unsigned char jpeg_soi[] = {
  	0xFF, 0xD8
  };
  
  static const unsigned char jpeg_app0[] = {
  	0xFF, 0xE0,
  	0x00, 0x10, 0x4A, 0x46, 0x49, 0x46, 0x00,
  	0x01, 0x01, 0x00, 0x00, 0x01, 0x00, 0x01,
  	0x00, 0x00
  };
  
  static const unsigned char jpeg_app14[] = {
  	0xFF, 0xEE,
  	0x00, 0x0E, 0x41, 0x64, 0x6F, 0x62, 0x65,
  	0x00, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00
  };
  
  static const unsigned char jpeg_dqt[] = {
  	0xFF, 0xDB,
  	0x00, 0x84, 0x00, 0x10, 0x0B, 0x0C, 0x0E,
  	0x0C, 0x0A, 0x10, 0x0E, 0x0D, 0x0E, 0x12,
  	0x11, 0x10, 0x13, 0x18, 0x28, 0x1A, 0x18,
  	0x16, 0x16, 0x18, 0x31, 0x23, 0x25, 0x1D,
  	0x28, 0x3A, 0x33, 0x3D, 0x3C, 0x39, 0x33,
  	0x38, 0x37, 0x40, 0x48, 0x5C, 0x4E, 0x40,
  	0x44, 0x57, 0x45, 0x37, 0x38, 0x50, 0x6D,
  	0x51, 0x57, 0x5F, 0x62, 0x67, 0x68, 0x67,
  	0x3E, 0x4D, 0x71, 0x79, 0x70, 0x64, 0x78,
  	0x5C, 0x65, 0x67, 0x63, 0x01, 0x11, 0x12,
  	0x12, 0x18, 0x15, 0x18, 0x2F, 0x1A, 0x1A,
  	0x2F, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
  	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
  	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
  	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
  	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
  	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
  	0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
  	0x63, 0x63, 0x63, 0x63, 0x63, 0x63
  };
  
  static const unsigned char jpeg_sof_maximal[] = {
  	0xFF, 0xC0,
  	0x00, 0x14, 0x08, 0x00, 0x40, 0x00, 0x40,
  	0x04, 0x01, 0x11, 0x00, 0x02, 0x11, 0x01,
  	0x03, 0x11, 0x01, 0x04, 0x11, 0x01
  };
  
  static const unsigned char jpeg_dht[] = {
  	0xFF, 0xC4,
  	0x01, 0xA2, 0x00, 0x00, 0x01, 0x05, 0x01,
  	0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,
  	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
  	0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
  	0x09, 0x0A, 0x0B, 0x10, 0x00, 0x02, 0x01,
  	0x03, 0x03, 0x02, 0x04, 0x03, 0x05, 0x05,
  	0x04, 0x04, 0x00, 0x00, 0x01, 0x7D, 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,
  	0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01,
  	0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,
  	0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03,
  	0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,
  	0x0B, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04,
  	0x04, 0x03, 0x04, 0x07, 0x05, 0x04, 0x04,
  	0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02,
  	0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06,
  	0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13,
  	0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
  	0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52,
  	0xF0, 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16,
  	0x24, 0x34, 0xE1, 0x25, 0xF1, 0x17, 0x18,
  	0x19, 0x1A, 0x26, 0x27, 0x28, 0x29, 0x2A,
  	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, 0x82, 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, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
  	0xE8, 0xE9, 0xEA, 0xF2, 0xF3, 0xF4, 0xF5,
  	0xF6, 0xF7, 0xF8, 0xF9, 0xFA
  };
  
  static const unsigned char jpeg_dri[] = {
  	0xFF, 0xDD,
  	0x00, 0x04, 0x00, 0x20
  };
  
  static const unsigned char jpeg_sos_maximal[] = {
  	0xFF, 0xDA,
  	0x00, 0x0C, 0x04, 0x01, 0x00, 0x02, 0x11, 0x03,
  	0x11, 0x04, 0x11, 0x00, 0x3F, 0x00
  };
  
  static const unsigned char jpeg_image_red[] = {
  	0xFC, 0x5F, 0xA2, 0xBF, 0xCA, 0x73, 0xFE, 0xFE,
  	0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00,
  	0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02,
  	0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28,
  	0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A,
  	0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0,
  	0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00,
  	0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02,
  	0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00, 0x28,
  	0xA0, 0x02, 0x8A, 0x00, 0x28, 0xA0, 0x02, 0x8A,
  	0x00, 0x28, 0xA0, 0x02, 0x8A, 0x00
  };
  
  static const unsigned char jpeg_eoi[] = {
  	0xFF, 0xD9
  };
  
  struct mxc_jpeg_src_buf {
  	/* common v4l buffer stuff -- must be first */
  	struct vb2_v4l2_buffer	b;
  	struct list_head	list;
  
  	/* mxc-jpeg specific */
  	bool			dht_needed;
  	bool			jpeg_parse_error;
  };
  
  static inline struct mxc_jpeg_src_buf *vb2_to_mxc_buf(struct vb2_buffer *vb)
  {
  	return container_of(to_vb2_v4l2_buffer(vb),
  			    struct mxc_jpeg_src_buf, b);
  }
  
  static unsigned int debug;
  module_param(debug, int, 0644);
  MODULE_PARM_DESC(debug, "Debug level (0-3)");
  
  static void _bswap16(u16 *a)
  {
  	*a = ((*a & 0x00FF) << 8) | ((*a & 0xFF00) >> 8);
  }
  
  static void print_mxc_buf(struct mxc_jpeg_dev *jpeg, struct vb2_buffer *buf,
  			  unsigned long len)
  {
  	unsigned int plane_no;
  	u32 dma_addr;
  	void *vaddr;
  	unsigned long payload;
  
  	if (debug < 3)
  		return;
  
  	for (plane_no = 0; plane_no < buf->num_planes; plane_no++) {
  		payload = vb2_get_plane_payload(buf, plane_no);
  		if (len == 0)
  			len = payload;
  		dma_addr = vb2_dma_contig_plane_dma_addr(buf, plane_no);
  		vaddr = vb2_plane_vaddr(buf, plane_no);
  		v4l2_dbg(3, debug, &jpeg->v4l2_dev,
  			 "plane %d (vaddr=%p dma_addr=%x payload=%ld):",
  			  plane_no, vaddr, dma_addr, payload);
  		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
  			       vaddr, len, false);
  	}
  }
  
  static inline struct mxc_jpeg_ctx *mxc_jpeg_fh_to_ctx(struct v4l2_fh *fh)
  {
  	return container_of(fh, struct mxc_jpeg_ctx, fh);
  }
  
  static int enum_fmt(const struct mxc_jpeg_fmt *mxc_formats, int n,
  		    struct v4l2_fmtdesc *f, u32 type)
  {
  	int i, num = 0;
  
  	for (i = 0; i < n; ++i) {
  		if (mxc_formats[i].flags == type) {
  			/* index-th format of searched 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;
  
  	strscpy(f->description, mxc_formats[i].name, sizeof(f->description));
  	f->pixelformat = mxc_formats[i].fourcc;
  
  	return 0;
  }
  
  static const struct mxc_jpeg_fmt *mxc_jpeg_find_format(struct mxc_jpeg_ctx *ctx,
  						       u32 pixelformat)
  {
  	unsigned int k;
  
  	for (k = 0; k < MXC_JPEG_NUM_FORMATS; k++) {
  		const struct mxc_jpeg_fmt *fmt = &mxc_formats[k];
  
  		if (fmt->fourcc == pixelformat)
  			return fmt;
  	}
  	return NULL;
  }
  
  static enum mxc_jpeg_image_format mxc_jpeg_fourcc_to_imgfmt(u32 fourcc)
  {
  	switch (fourcc) {
  	case V4L2_PIX_FMT_GREY:
  		return MXC_JPEG_GRAY;
  	case V4L2_PIX_FMT_YUYV:
  		return MXC_JPEG_YUV422;
  	case V4L2_PIX_FMT_NV12M:
  		return MXC_JPEG_YUV420;
  	case V4L2_PIX_FMT_YUV24:
  		return MXC_JPEG_YUV444;
  	case V4L2_PIX_FMT_RGB24:
  		return MXC_JPEG_RGB;
  	case V4L2_PIX_FMT_ARGB32:
  		return MXC_JPEG_ARGB;
  	default:
  		return MXC_JPEG_INVALID;
  	}
  }
  
  static struct mxc_jpeg_q_data *mxc_jpeg_get_q_data(struct mxc_jpeg_ctx *ctx,
  						   enum v4l2_buf_type type)
  {
  	if (V4L2_TYPE_IS_OUTPUT(type))
  		return &ctx->out_q;
  	return &ctx->cap_q;
  }
  
  static void mxc_jpeg_addrs(struct mxc_jpeg_desc *desc,
  			   struct vb2_buffer *raw_buf,
  			   struct vb2_buffer *jpeg_buf, int offset)
  {
  	int img_fmt = desc->stm_ctrl & STM_CTRL_IMAGE_FORMAT_MASK;
  
  	desc->buf_base0 = vb2_dma_contig_plane_dma_addr(raw_buf, 0);
  	desc->buf_base1 = 0;
  	if (img_fmt == STM_CTRL_IMAGE_FORMAT(MXC_JPEG_YUV420)) {
  		WARN_ON(raw_buf->num_planes < 2);
  		desc->buf_base1 = vb2_dma_contig_plane_dma_addr(raw_buf, 1);
  	}
  	desc->stm_bufbase = vb2_dma_contig_plane_dma_addr(jpeg_buf, 0) +
  		offset;
  }
  
  static void notify_eos(struct mxc_jpeg_ctx *ctx)
  {
  	const struct v4l2_event ev = {
  		.type = V4L2_EVENT_EOS
  	};
  
  	dev_dbg(ctx->mxc_jpeg->dev, "Notify app event EOS reached");
  	v4l2_event_queue_fh(&ctx->fh, &ev);
  }
  
  static void notify_src_chg(struct mxc_jpeg_ctx *ctx)
  {
  	const struct v4l2_event ev = {
  			.type = V4L2_EVENT_SOURCE_CHANGE,
  			.u.src_change.changes =
  			V4L2_EVENT_SRC_CH_RESOLUTION,
  		};
  
  	dev_dbg(ctx->mxc_jpeg->dev, "Notify app event SRC_CH_RESOLUTION");
  	v4l2_event_queue_fh(&ctx->fh, &ev);
  }
  
  static int mxc_get_free_slot(struct mxc_jpeg_slot_data slot_data[], int n)
  {
  	int free_slot = 0;
  
  	while (slot_data[free_slot].used && free_slot < n)
  		free_slot++;
  
  	return free_slot; /* >=n when there are no more free slots */
  }
  
  static bool mxc_jpeg_alloc_slot_data(struct mxc_jpeg_dev *jpeg,
  				     unsigned int slot)
  {
  	struct mxc_jpeg_desc *desc;
  	struct mxc_jpeg_desc *cfg_desc;
  	void *cfg_stm;
  
  	if (jpeg->slot_data[slot].desc)
  		goto skip_alloc; /* already allocated, reuse it */
  
  	/* allocate descriptor for decoding/encoding phase */
  	desc = dma_alloc_coherent(jpeg->dev,
  				  sizeof(struct mxc_jpeg_desc),
  				  &jpeg->slot_data[slot].desc_handle,
  				  GFP_ATOMIC);
  	if (!desc)
  		goto err;
  	jpeg->slot_data[slot].desc = desc;
  
  	/* allocate descriptor for configuration phase (encoder only) */
  	cfg_desc = dma_alloc_coherent(jpeg->dev,
  				      sizeof(struct mxc_jpeg_desc),
  				      &jpeg->slot_data[slot].cfg_desc_handle,
  				      GFP_ATOMIC);
  	if (!cfg_desc)
  		goto err;
  	jpeg->slot_data[slot].cfg_desc = cfg_desc;
  
  	/* allocate configuration stream */
  	cfg_stm = dma_alloc_coherent(jpeg->dev,
  				     MXC_JPEG_MAX_CFG_STREAM,
  				     &jpeg->slot_data[slot].cfg_stream_handle,
  				     GFP_ATOMIC);
  	if (!cfg_stm)
  		goto err;
  	jpeg->slot_data[slot].cfg_stream_vaddr = cfg_stm;
  
  skip_alloc:
  	jpeg->slot_data[slot].used = true;
  
  	return true;
  err:
  	dev_err(jpeg->dev, "Could not allocate descriptors for slot %d", slot);
  
  	return false;
  }
  
  static void mxc_jpeg_free_slot_data(struct mxc_jpeg_dev *jpeg,
  				    unsigned int slot)
  {
  	if (slot >= MXC_MAX_SLOTS) {
  		dev_err(jpeg->dev, "Invalid slot %d, nothing to free.", slot);
  		return;
  	}
  
  	/* free descriptor for decoding/encoding phase */
  	dma_free_coherent(jpeg->dev, sizeof(struct mxc_jpeg_desc),
  			  jpeg->slot_data[slot].desc,
  			  jpeg->slot_data[slot].desc_handle);
  
  	/* free descriptor for encoder configuration phase / decoder DHT */
  	dma_free_coherent(jpeg->dev, sizeof(struct mxc_jpeg_desc),
  			  jpeg->slot_data[slot].cfg_desc,
  			  jpeg->slot_data[slot].cfg_desc_handle);
  
  	/* free configuration stream */
  	dma_free_coherent(jpeg->dev, MXC_JPEG_MAX_CFG_STREAM,
  			  jpeg->slot_data[slot].cfg_stream_vaddr,
  			  jpeg->slot_data[slot].cfg_stream_handle);
  
  	jpeg->slot_data[slot].used = false;
  }
  
  static irqreturn_t mxc_jpeg_dec_irq(int irq, void *priv)
  {
  	struct mxc_jpeg_dev *jpeg = priv;
  	struct mxc_jpeg_ctx *ctx;
  	void __iomem *reg = jpeg->base_reg;
  	struct device *dev = jpeg->dev;
  	struct vb2_v4l2_buffer *src_buf, *dst_buf;
  	struct mxc_jpeg_src_buf *jpeg_src_buf;
  	enum vb2_buffer_state buf_state;
  	u32 dec_ret, com_status;
  	unsigned long payload;
  	struct mxc_jpeg_q_data *q_data;
  	enum v4l2_buf_type cap_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
  	unsigned int slot;
  
  	spin_lock(&jpeg->hw_lock);
  
  	com_status = readl(reg + COM_STATUS);
  	slot = COM_STATUS_CUR_SLOT(com_status);
  	dev_dbg(dev, "Irq %d on slot %d.\n", irq, slot);
  
  	ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
  	if (!ctx) {
  		dev_err(dev,
  			"Instance released before the end of transaction.\n");
  		/* soft reset only resets internal state, not registers */
  		mxc_jpeg_sw_reset(reg);
  		/* clear all interrupts */
  		writel(0xFFFFFFFF, reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS));
  		goto job_unlock;
  	}
  
  	if (slot != ctx->slot) {
  		/* TODO investigate when adding multi-instance support */
  		dev_warn(dev, "IRQ slot %d != context slot %d.\n",
  			 slot, ctx->slot);
  		goto job_unlock;
  	}
  
  	dec_ret = readl(reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS));
  	writel(dec_ret, reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS)); /* w1c */
  
  	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	if (!dst_buf || !src_buf) {
  		dev_err(dev, "No source or destination buffer.\n");
  		goto job_unlock;
  	}
  	jpeg_src_buf = vb2_to_mxc_buf(&src_buf->vb2_buf);
  
  	if (dec_ret & SLOT_STATUS_ENC_CONFIG_ERR) {
  		u32 ret = readl(reg + CAST_STATUS12);
  
  		dev_err(dev, "Encoder/decoder error, status=0x%08x", ret);
  		mxc_jpeg_sw_reset(reg);
  		buf_state = VB2_BUF_STATE_ERROR;
  		goto buffers_done;
  	}
  
  	if (!(dec_ret & SLOT_STATUS_FRMDONE))
  		goto job_unlock;
  
  	if (jpeg->mode == MXC_JPEG_ENCODE &&
  	    ctx->enc_state == MXC_JPEG_ENC_CONF) {
  		ctx->enc_state = MXC_JPEG_ENCODING;
  		dev_dbg(dev, "Encoder config finished. Start encoding...\n");
  		mxc_jpeg_enc_mode_go(dev, reg);
  		goto job_unlock;
  	}
  	if (jpeg->mode == MXC_JPEG_DECODE && jpeg_src_buf->dht_needed) {
  		jpeg_src_buf->dht_needed = false;
  		dev_dbg(dev, "Decoder DHT cfg finished. Start decoding...\n");
  		goto job_unlock;
  	}
  	if (jpeg->mode == MXC_JPEG_ENCODE) {
  		payload = readl(reg + MXC_SLOT_OFFSET(slot, SLOT_BUF_PTR));
  		vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload);
  		dev_dbg(dev, "Encoding finished, payload size: %ld\n",
  			payload);
  	} else {
  		q_data = mxc_jpeg_get_q_data(ctx, cap_type);
  		payload = q_data->sizeimage[0];
  		vb2_set_plane_payload(&dst_buf->vb2_buf, 0, payload);
  		vb2_set_plane_payload(&dst_buf->vb2_buf, 1, 0);
  		if (q_data->fmt->colplanes == 2) {
  			payload = q_data->sizeimage[1];
  			vb2_set_plane_payload(&dst_buf->vb2_buf, 1, payload);
  		}
  		dev_dbg(dev, "Decoding finished, payload size: %ld + %ld\n",
  			vb2_get_plane_payload(&dst_buf->vb2_buf, 0),
  			vb2_get_plane_payload(&dst_buf->vb2_buf, 1));
  	}
  
  	/* short preview of the results */
  	dev_dbg(dev, "src_buf preview: ");
  	print_mxc_buf(jpeg, &src_buf->vb2_buf, 32);
  	dev_dbg(dev, "dst_buf preview: ");
  	print_mxc_buf(jpeg, &dst_buf->vb2_buf, 32);
  	buf_state = VB2_BUF_STATE_DONE;
  
  buffers_done:
  	jpeg->slot_data[slot].used = false; /* unused, but don't free */
  	v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
  	v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
  	v4l2_m2m_buf_done(src_buf, buf_state);
  	v4l2_m2m_buf_done(dst_buf, buf_state);
  	spin_unlock(&jpeg->hw_lock);
  	v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
  	return IRQ_HANDLED;
  job_unlock:
  	spin_unlock(&jpeg->hw_lock);
  	return IRQ_HANDLED;
  }
  
  static int mxc_jpeg_fixup_sof(struct mxc_jpeg_sof *sof,
  			      u32 fourcc,
  			      u16 w, u16 h)
  {
  	int sof_length;
  
  	sof->precision = 8; /* TODO allow 8/12 bit precision*/
  	sof->height = h;
  	_bswap16(&sof->height);
  	sof->width = w;
  	_bswap16(&sof->width);
  
  	switch (fourcc) {
  	case V4L2_PIX_FMT_NV12M:
  		sof->components_no = 3;
  		sof->comp[0].v = 0x2;
  		sof->comp[0].h = 0x2;
  		break;
  	case V4L2_PIX_FMT_YUYV:
  		sof->components_no = 3;
  		sof->comp[0].v = 0x1;
  		sof->comp[0].h = 0x2;
  		break;
  	case V4L2_PIX_FMT_YUV24:
  	case V4L2_PIX_FMT_RGB24:
  	default:
  		sof->components_no = 3;
  		break;
  	case V4L2_PIX_FMT_ARGB32:
  		sof->components_no = 4;
  		break;
  	case V4L2_PIX_FMT_GREY:
  		sof->components_no = 1;
  		break;
  	}
  	sof_length = 8 + 3 * sof->components_no;
  	sof->length = sof_length;
  	_bswap16(&sof->length);
  
  	return sof_length; /* not swaped */
  }
  
  static int mxc_jpeg_fixup_sos(struct mxc_jpeg_sos *sos,
  			      u32 fourcc)
  {
  	int sos_length;
  	u8 *sof_u8 = (u8 *)sos;
  
  	switch (fourcc) {
  	case V4L2_PIX_FMT_NV12M:
  		sos->components_no = 3;
  		break;
  	case V4L2_PIX_FMT_YUYV:
  		sos->components_no = 3;
  		break;
  	case V4L2_PIX_FMT_YUV24:
  	case V4L2_PIX_FMT_RGB24:
  	default:
  		sos->components_no = 3;
  		break;
  	case V4L2_PIX_FMT_ARGB32:
  		sos->components_no = 4;
  		break;
  	case V4L2_PIX_FMT_GREY:
  		sos->components_no = 1;
  		break;
  	}
  	sos_length = 6 + 2 * sos->components_no;
  	sos->length = sos_length;
  	_bswap16(&sos->length);
  
  	/* SOS ignorable bytes, not so ignorable after all */
  	sof_u8[sos_length - 1] = 0x0;
  	sof_u8[sos_length - 2] = 0x3f;
  	sof_u8[sos_length - 3] = 0x0;
  
  	return sos_length; /* not swaped */
  }
  
  static unsigned int mxc_jpeg_setup_cfg_stream(void *cfg_stream_vaddr,
  					      u32 fourcc,
  					      u16 w, u16 h)
  {
  	unsigned int offset = 0;
  	u8 *cfg = (u8 *)cfg_stream_vaddr;
  	struct mxc_jpeg_sof *sof;
  	struct mxc_jpeg_sos *sos;
  
  	memcpy(cfg + offset, jpeg_soi, ARRAY_SIZE(jpeg_soi));
  	offset += ARRAY_SIZE(jpeg_soi);
  
  	if (fourcc == V4L2_PIX_FMT_RGB24 ||
  	    fourcc == V4L2_PIX_FMT_ARGB32) {
  		memcpy(cfg + offset, jpeg_app14, sizeof(jpeg_app14));
  		offset += sizeof(jpeg_app14);
  	} else {
  		memcpy(cfg + offset, jpeg_app0, sizeof(jpeg_app0));
  		offset += sizeof(jpeg_app0);
  	}
  
  	memcpy(cfg + offset, jpeg_dqt, sizeof(jpeg_dqt));
  	offset += sizeof(jpeg_dqt);
  
  	memcpy(cfg + offset, jpeg_sof_maximal, sizeof(jpeg_sof_maximal));
  	offset += 2; /* skip marker ID */
  	sof = (struct mxc_jpeg_sof *)(cfg + offset);
  	offset += mxc_jpeg_fixup_sof(sof, fourcc, w, h);
  
  	memcpy(cfg + offset, jpeg_dht, sizeof(jpeg_dht));
  	offset += sizeof(jpeg_dht);
  
  	memcpy(cfg + offset, jpeg_dri, sizeof(jpeg_dri));
  	offset += sizeof(jpeg_dri);
  
  	memcpy(cfg + offset, jpeg_sos_maximal, sizeof(jpeg_sos_maximal));
  	offset += 2; /* skip marker ID */
  	sos = (struct mxc_jpeg_sos *)(cfg + offset);
  	offset += mxc_jpeg_fixup_sos(sos, fourcc);
  
  	memcpy(cfg + offset, jpeg_image_red, sizeof(jpeg_image_red));
  	offset += sizeof(jpeg_image_red);
  
  	memcpy(cfg + offset, jpeg_eoi, sizeof(jpeg_eoi));
  	offset += sizeof(jpeg_eoi);
  
  	return offset;
  }
  
  static void mxc_jpeg_config_dec_desc(struct vb2_buffer *out_buf,
  				     struct mxc_jpeg_ctx *ctx,
  				     struct vb2_buffer *src_buf,
  				     struct vb2_buffer *dst_buf)
  {
  	enum v4l2_buf_type cap_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
  	struct mxc_jpeg_q_data *q_data_cap;
  	enum mxc_jpeg_image_format img_fmt;
  	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
  	void __iomem *reg = jpeg->base_reg;
  	unsigned int slot = ctx->slot;
  	struct mxc_jpeg_desc *desc = jpeg->slot_data[slot].desc;
  	struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data[slot].cfg_desc;
  	dma_addr_t desc_handle = jpeg->slot_data[slot].desc_handle;
  	dma_addr_t cfg_desc_handle = jpeg->slot_data[slot].cfg_desc_handle;
  	dma_addr_t cfg_stream_handle = jpeg->slot_data[slot].cfg_stream_handle;
  	unsigned int *cfg_size = &jpeg->slot_data[slot].cfg_stream_size;
  	void *cfg_stream_vaddr = jpeg->slot_data[slot].cfg_stream_vaddr;
  	struct mxc_jpeg_src_buf *jpeg_src_buf;
  
  	jpeg_src_buf = vb2_to_mxc_buf(src_buf);
  
  	/* setup the decoding descriptor */
  	desc->next_descpt_ptr = 0; /* end of chain */
  	q_data_cap = mxc_jpeg_get_q_data(ctx, cap_type);
  	desc->imgsize = q_data_cap->w_adjusted << 16 | q_data_cap->h_adjusted;
  	img_fmt = mxc_jpeg_fourcc_to_imgfmt(q_data_cap->fmt->fourcc);
  	desc->stm_ctrl &= ~STM_CTRL_IMAGE_FORMAT(0xF); /* clear image format */
  	desc->stm_ctrl |= STM_CTRL_IMAGE_FORMAT(img_fmt);
  	desc->stm_ctrl |= STM_CTRL_BITBUF_PTR_CLR(1);
  	desc->line_pitch = q_data_cap->bytesperline[0];
  	mxc_jpeg_addrs(desc, dst_buf, src_buf, 0);
  	mxc_jpeg_set_bufsize(desc, ALIGN(vb2_plane_size(src_buf, 0), 1024));
  	print_descriptor_info(jpeg->dev, desc);
  
  	if (!jpeg_src_buf->dht_needed) {
  		/* validate the decoding descriptor */
  		mxc_jpeg_set_desc(desc_handle, reg, slot);
  		return;
  	}
  
  	/*
  	 * if a default huffman table is needed, use the config descriptor to
  	 * inject a DHT, by chaining it before the decoding descriptor
  	 */
  	*cfg_size = mxc_jpeg_setup_cfg_stream(cfg_stream_vaddr,
  					      V4L2_PIX_FMT_YUYV,
  					      MXC_JPEG_MIN_WIDTH,
  					      MXC_JPEG_MIN_HEIGHT);
  	cfg_desc->next_descpt_ptr = desc_handle | MXC_NXT_DESCPT_EN;
  	cfg_desc->buf_base0 = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
  	cfg_desc->buf_base1 = 0;
  	cfg_desc->imgsize = MXC_JPEG_MIN_WIDTH << 16;
  	cfg_desc->imgsize |= MXC_JPEG_MIN_HEIGHT;
  	cfg_desc->line_pitch = MXC_JPEG_MIN_WIDTH * 2;
  	cfg_desc->stm_ctrl = STM_CTRL_IMAGE_FORMAT(MXC_JPEG_YUV422);
  	cfg_desc->stm_ctrl |= STM_CTRL_BITBUF_PTR_CLR(1);
  	cfg_desc->stm_bufbase = cfg_stream_handle;
  	cfg_desc->stm_bufsize = ALIGN(*cfg_size, 1024);
  	print_descriptor_info(jpeg->dev, cfg_desc);
  
  	/* validate the configuration descriptor */
  	mxc_jpeg_set_desc(cfg_desc_handle, reg, slot);
  }
  
  static void mxc_jpeg_config_enc_desc(struct vb2_buffer *out_buf,
  				     struct mxc_jpeg_ctx *ctx,
  				     struct vb2_buffer *src_buf,
  				     struct vb2_buffer *dst_buf)
  {
  	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
  	void __iomem *reg = jpeg->base_reg;
  	unsigned int slot = ctx->slot;
  	struct mxc_jpeg_desc *desc = jpeg->slot_data[slot].desc;
  	struct mxc_jpeg_desc *cfg_desc = jpeg->slot_data[slot].cfg_desc;
  	dma_addr_t desc_handle = jpeg->slot_data[slot].desc_handle;
  	dma_addr_t cfg_desc_handle = jpeg->slot_data[slot].cfg_desc_handle;
  	void *cfg_stream_vaddr = jpeg->slot_data[slot].cfg_stream_vaddr;
  	struct mxc_jpeg_q_data *q_data;
  	enum mxc_jpeg_image_format img_fmt;
  	int w, h;
  
  	q_data = mxc_jpeg_get_q_data(ctx, src_buf->vb2_queue->type);
  
  	jpeg->slot_data[slot].cfg_stream_size =
  			mxc_jpeg_setup_cfg_stream(cfg_stream_vaddr,
  						  q_data->fmt->fourcc,
  						  q_data->w_adjusted,
  						  q_data->h_adjusted);
  
  	/* chain the config descriptor with the encoding descriptor */
  	cfg_desc->next_descpt_ptr = desc_handle | MXC_NXT_DESCPT_EN;
  
  	cfg_desc->buf_base0 = jpeg->slot_data[slot].cfg_stream_handle;
  	cfg_desc->buf_base1 = 0;
  	cfg_desc->line_pitch = 0;
  	cfg_desc->stm_bufbase = 0; /* no output expected */
  	cfg_desc->stm_bufsize = 0x0;
  	cfg_desc->imgsize = 0;
  	cfg_desc->stm_ctrl = STM_CTRL_CONFIG_MOD(1);
  	cfg_desc->stm_ctrl |= STM_CTRL_BITBUF_PTR_CLR(1);
  
  	desc->next_descpt_ptr = 0; /* end of chain */
  
  	/* use adjusted resolution for CAST IP job */
  	w = q_data->w_adjusted;
  	h = q_data->h_adjusted;
  	mxc_jpeg_set_res(desc, w, h);
  	mxc_jpeg_set_line_pitch(desc, w * (q_data->fmt->depth / 8));
  	mxc_jpeg_set_bufsize(desc, desc->line_pitch * h);
  	img_fmt = mxc_jpeg_fourcc_to_imgfmt(q_data->fmt->fourcc);
  	if (img_fmt == MXC_JPEG_INVALID)
  		dev_err(jpeg->dev, "No valid image format detected\n");
  	desc->stm_ctrl = STM_CTRL_CONFIG_MOD(0) |
  			 STM_CTRL_IMAGE_FORMAT(img_fmt);
  	desc->stm_ctrl |= STM_CTRL_BITBUF_PTR_CLR(1);
  	mxc_jpeg_addrs(desc, src_buf, dst_buf, 0);
  	dev_dbg(jpeg->dev, "cfg_desc:\n");
  	print_descriptor_info(jpeg->dev, cfg_desc);
  	dev_dbg(jpeg->dev, "enc desc:\n");
  	print_descriptor_info(jpeg->dev, desc);
  	print_wrapper_info(jpeg->dev, reg);
  	print_cast_status(jpeg->dev, reg, MXC_JPEG_ENCODE);
  
  	/* validate the configuration descriptor */
  	mxc_jpeg_set_desc(cfg_desc_handle, reg, slot);
  }
  
  static void mxc_jpeg_device_run(void *priv)
  {
  	struct mxc_jpeg_ctx *ctx = priv;
  	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
  	void __iomem *reg = jpeg->base_reg;
  	struct device *dev = jpeg->dev;
  	struct vb2_v4l2_buffer *src_buf, *dst_buf;
  	unsigned long flags;
  	struct mxc_jpeg_q_data *q_data_cap, *q_data_out;
  	struct mxc_jpeg_src_buf *jpeg_src_buf;
  
  	spin_lock_irqsave(&ctx->mxc_jpeg->hw_lock, flags);
  	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
  	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
  	if (!src_buf || !dst_buf) {
  		dev_err(dev, "Null src or dst buf\n");
  		goto end;
  	}
  
  	q_data_cap = mxc_jpeg_get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
  	if (!q_data_cap)
  		goto end;
  	q_data_out = mxc_jpeg_get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
  	if (!q_data_out)
  		goto end;
  	src_buf->sequence = q_data_out->sequence++;
  	dst_buf->sequence = q_data_cap->sequence++;
  
  	v4l2_m2m_buf_copy_metadata(src_buf, dst_buf, true);
  
  	jpeg_src_buf = vb2_to_mxc_buf(&src_buf->vb2_buf);
  	if (q_data_cap->fmt->colplanes != dst_buf->vb2_buf.num_planes) {
  		dev_err(dev, "Capture format %s has %d planes, but capture buffer has %d planes\n",
  			q_data_cap->fmt->name, q_data_cap->fmt->colplanes,
  			dst_buf->vb2_buf.num_planes);
  		jpeg_src_buf->jpeg_parse_error = true;
  	}
  	if (jpeg_src_buf->jpeg_parse_error) {
  		v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
  		v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
  		v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_ERROR);
  		v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_ERROR);
  		spin_unlock_irqrestore(&ctx->mxc_jpeg->hw_lock, flags);
  		v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
  
  		return;
  	}
  
  	mxc_jpeg_enable(reg);
  	mxc_jpeg_set_l_endian(reg, 1);
  
  	ctx->slot = mxc_get_free_slot(jpeg->slot_data, MXC_MAX_SLOTS);
  	if (ctx->slot >= MXC_MAX_SLOTS) {
  		dev_err(dev, "No more free slots\n");
  		goto end;
  	}
  	if (!mxc_jpeg_alloc_slot_data(jpeg, ctx->slot)) {
  		dev_err(dev, "Cannot allocate slot data\n");
  		goto end;
  	}
  
  	mxc_jpeg_enable_slot(reg, ctx->slot);
  	mxc_jpeg_enable_irq(reg, ctx->slot);
  
  	if (jpeg->mode == MXC_JPEG_ENCODE) {
  		dev_dbg(dev, "Encoding on slot %d\n", ctx->slot);
  		ctx->enc_state = MXC_JPEG_ENC_CONF;
  		mxc_jpeg_config_enc_desc(&dst_buf->vb2_buf, ctx,
  					 &src_buf->vb2_buf, &dst_buf->vb2_buf);
  		mxc_jpeg_enc_mode_conf(dev, reg); /* start config phase */
  	} else {
  		dev_dbg(dev, "Decoding on slot %d\n", ctx->slot);
  		print_mxc_buf(jpeg, &src_buf->vb2_buf, 0);
  		mxc_jpeg_config_dec_desc(&dst_buf->vb2_buf, ctx,
  					 &src_buf->vb2_buf, &dst_buf->vb2_buf);
  		mxc_jpeg_dec_mode_go(dev, reg);
  	}
  end:
  	spin_unlock_irqrestore(&ctx->mxc_jpeg->hw_lock, flags);
  }
  
  static void mxc_jpeg_set_last_buffer_dequeued(struct mxc_jpeg_ctx *ctx)
  {
  	struct vb2_queue *q;
  
  	ctx->stopped = 1;
  	q = v4l2_m2m_get_dst_vq(ctx->fh.m2m_ctx);
  	if (!list_empty(&q->done_list))
  		return;
  
  	q->last_buffer_dequeued = true;
  	wake_up(&q->done_wq);
  	ctx->stopped = 0;
  }
  
  static int mxc_jpeg_decoder_cmd(struct file *file, void *priv,
  				struct v4l2_decoder_cmd *cmd)
  {
  	struct v4l2_fh *fh = file->private_data;
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(fh);
  	struct device *dev = ctx->mxc_jpeg->dev;
  	int ret;
  
  	ret = v4l2_m2m_ioctl_try_decoder_cmd(file, fh, cmd);
  	if (ret < 0)
  		return ret;
  
  	if (cmd->cmd == V4L2_DEC_CMD_STOP) {
  		dev_dbg(dev, "Received V4L2_DEC_CMD_STOP");
  		if (v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx) == 0) {
  			/* No more src bufs, notify app EOS */
  			notify_eos(ctx);
  			mxc_jpeg_set_last_buffer_dequeued(ctx);
  		} else {
  			/* will send EOS later*/
  			ctx->stopping = 1;
  		}
  	}
  
  	return 0;
  }
  
  static int mxc_jpeg_encoder_cmd(struct file *file, void *priv,
  				struct v4l2_encoder_cmd *cmd)
  {
  	struct v4l2_fh *fh = file->private_data;
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(fh);
  	struct device *dev = ctx->mxc_jpeg->dev;
  	int ret;
  
  	ret = v4l2_m2m_ioctl_try_encoder_cmd(file, fh, cmd);
  	if (ret < 0)
  		return ret;
  
  	if (cmd->cmd == V4L2_ENC_CMD_STOP) {
  		dev_dbg(dev, "Received V4L2_ENC_CMD_STOP");
  		if (v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx) == 0) {
  			/* No more src bufs, notify app EOS */
  			notify_eos(ctx);
  			mxc_jpeg_set_last_buffer_dequeued(ctx);
  		} else {
  			/* will send EOS later*/
  			ctx->stopping = 1;
  		}
  	}
  
  	return 0;
  }
  
  static int mxc_jpeg_queue_setup(struct vb2_queue *q,
  				unsigned int *nbuffers,
  				unsigned int *nplanes,
  				unsigned int sizes[],
  				struct device *alloc_ctxs[])
  {
  	struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(q);
  	struct mxc_jpeg_q_data *q_data = NULL;
  	int i;
  
  	q_data = mxc_jpeg_get_q_data(ctx, q->type);
  	if (!q_data)
  		return -EINVAL;
  
  	/* Handle CREATE_BUFS situation - *nplanes != 0 */
  	if (*nplanes) {
  		for (i = 0; i < *nplanes; i++) {
  			if (sizes[i] < q_data->sizeimage[i])
  				return -EINVAL;
  		}
  		return 0;
  	}
  
  	/* Handle REQBUFS situation */
  	*nplanes = q_data->fmt->colplanes;
  	for (i = 0; i < *nplanes; i++)
  		sizes[i] = q_data->sizeimage[i];
  
  	return 0;
  }
  
  static int mxc_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
  {
  	struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(q);
  	struct mxc_jpeg_q_data *q_data = mxc_jpeg_get_q_data(ctx, q->type);
  	int ret;
  
  	dev_dbg(ctx->mxc_jpeg->dev, "Start streaming ctx=%p", ctx);
  	q_data->sequence = 0;
  
  	ret = pm_runtime_resume_and_get(ctx->mxc_jpeg->dev);
  	if (ret < 0) {
  		dev_err(ctx->mxc_jpeg->dev, "Failed to power up jpeg\n");
  		return ret;
  	}
  
  	return 0;
  }
  
  static void mxc_jpeg_stop_streaming(struct vb2_queue *q)
  {
  	struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(q);
  	struct vb2_v4l2_buffer *vbuf;
  
  	dev_dbg(ctx->mxc_jpeg->dev, "Stop streaming ctx=%p", ctx);
  
  	/* Release all active buffers */
  	for (;;) {
  		if (V4L2_TYPE_IS_OUTPUT(q->type))
  			vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
  		else
  			vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
  		if (!vbuf)
  			break;
  		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
  	}
  	pm_runtime_put_sync(&ctx->mxc_jpeg->pdev->dev);
  	if (V4L2_TYPE_IS_OUTPUT(q->type)) {
  		ctx->stopping = 0;
  		ctx->stopped = 0;
  	}
  }
  
  static int mxc_jpeg_valid_comp_id(struct device *dev,
  				  struct mxc_jpeg_sof *sof,
  				  struct mxc_jpeg_sos *sos)
  {
  	int valid = 1;
  	int i;
  
  	/*
  	 * there's a limitation in the IP that the component IDs must be
  	 * between 0..4, if they are not, let's patch them
  	 */
  	for (i = 0; i < sof->components_no; i++)
  		if (sof->comp[i].id > MXC_JPEG_MAX_COMPONENTS) {
  			valid = 0;
  			dev_err(dev, "Component %d has invalid ID: %d",
  				i, sof->comp[i].id);
  		}
  	if (!valid)
  		/* patch all comp IDs if at least one is invalid */
  		for (i = 0; i < sof->components_no; i++) {
  			dev_warn(dev, "Component %d ID patched to: %d",
  				 i, i + 1);
  			sof->comp[i].id = i + 1;
  			sos->comp[i].id = i + 1;
  		}
  
  	return valid;
  }
  
  static u32 mxc_jpeg_get_image_format(struct device *dev,
  				     const struct v4l2_jpeg_header *header)
  {
  	int i;
  	u32 fourcc = 0;
  
  	for (i = 0; i < MXC_JPEG_NUM_FORMATS; i++)
  		if (mxc_formats[i].subsampling == header->frame.subsampling &&
  		    mxc_formats[i].nc == header->frame.num_components) {
  			fourcc = mxc_formats[i].fourcc;
  			break;
  		}
  	if (fourcc == 0) {
  		dev_err(dev, "Could not identify image format nc=%d, subsampling=%d\n",
  			header->frame.num_components,
  			header->frame.subsampling);
  		return fourcc;
  	}
  	/*
  	 * If the transform flag from APP14 marker is 0, images that are
  	 * encoded with 3 components have RGB colorspace, see Recommendation
  	 * ITU-T T.872 chapter 6.5.3 APP14 marker segment for colour encoding
  	 */
  	if (fourcc == V4L2_PIX_FMT_YUV24 || fourcc == V4L2_PIX_FMT_RGB24) {
  		if (header->app14_tf == V4L2_JPEG_APP14_TF_CMYK_RGB)
  			fourcc = V4L2_PIX_FMT_RGB24;
  		else
  			fourcc = V4L2_PIX_FMT_YUV24;
  	}
  
  	return fourcc;
  }
  
  static void mxc_jpeg_bytesperline(struct mxc_jpeg_q_data *q,
  				  u32 precision)
  {
  	/* Bytes distance between the leftmost pixels in two adjacent lines */
  	if (q->fmt->fourcc == V4L2_PIX_FMT_JPEG) {
  		/* bytesperline unused for compressed formats */
  		q->bytesperline[0] = 0;
  		q->bytesperline[1] = 0;
  	} else if (q->fmt->fourcc == V4L2_PIX_FMT_NV12M) {
  		/* When the image format is planar the bytesperline value
  		 * applies to the first plane and is divided by the same factor
  		 * as the width field for the other planes
  		 */
  		q->bytesperline[0] = q->w * (precision / 8) *
  				     (q->fmt->depth / 8);
  		q->bytesperline[1] = q->bytesperline[0];
  	} else {
  		/* single plane formats */
  		q->bytesperline[0] = q->w * (precision / 8) *
  				     (q->fmt->depth / 8);
  		q->bytesperline[1] = 0;
  	}
  }
  
  static void mxc_jpeg_sizeimage(struct mxc_jpeg_q_data *q)
  {
  	if (q->fmt->fourcc == V4L2_PIX_FMT_JPEG) {
  		/* if no sizeimage from user, assume worst jpeg compression */
  		if (!q->sizeimage[0])
  			q->sizeimage[0] = 6 * q->w * q->h;
  		q->sizeimage[1] = 0;
  
  		if (q->sizeimage[0] > MXC_JPEG_MAX_SIZEIMAGE)
  			q->sizeimage[0] = MXC_JPEG_MAX_SIZEIMAGE;
  
  		/* jpeg stream size must be multiple of 1K */
  		q->sizeimage[0] = ALIGN(q->sizeimage[0], 1024);
  	} else {
  		q->sizeimage[0] = q->bytesperline[0] * q->h;
  		q->sizeimage[1] = 0;
  		if (q->fmt->fourcc == V4L2_PIX_FMT_NV12M)
  			q->sizeimage[1] = q->sizeimage[0] / 2;
  	}
  }
  
  static int mxc_jpeg_parse(struct mxc_jpeg_ctx *ctx,
  			  u8 *src_addr, u32 size, bool *dht_needed)
  {
  	struct device *dev = ctx->mxc_jpeg->dev;
  	struct mxc_jpeg_q_data *q_data_out, *q_data_cap;
  	enum v4l2_buf_type cap_type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
  	bool src_chg = false;
  	u32 fourcc;
  	struct v4l2_jpeg_header header;
  	struct mxc_jpeg_sof *psof = NULL;
  	struct mxc_jpeg_sos *psos = NULL;
  	int ret;
  
  	memset(&header, 0, sizeof(header));
  	ret = v4l2_jpeg_parse_header((void *)src_addr, size, &header);
  	if (ret < 0) {
  		dev_err(dev, "Error parsing JPEG stream markers\n");
  		return ret;
  	}
  
  	/* if DHT marker present, no need to inject default one */
  	*dht_needed = (header.num_dht == 0);
  
  	q_data_out = mxc_jpeg_get_q_data(ctx,
  					 V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
  	if (q_data_out->w == 0 && q_data_out->h == 0) {
  		dev_warn(dev, "Invalid user resolution 0x0");
  		dev_warn(dev, "Keeping resolution from JPEG: %dx%d",
  			 header.frame.width, header.frame.height);
  		q_data_out->w = header.frame.width;
  		q_data_out->h = header.frame.height;
  	} else if (header.frame.width != q_data_out->w ||
  		   header.frame.height != q_data_out->h) {
  		dev_err(dev,
  			"Resolution mismatch: %dx%d (JPEG) versus %dx%d(user)",
  			header.frame.width, header.frame.height,
  			q_data_out->w, q_data_out->h);
  		return -EINVAL;
  	}
  	if (header.frame.width % 8 != 0 || header.frame.height % 8 != 0) {
  		dev_err(dev, "JPEG width or height not multiple of 8: %dx%d\n",
  			header.frame.width, header.frame.height);
  		return -EINVAL;
  	}
  	if (header.frame.width > MXC_JPEG_MAX_WIDTH ||
  	    header.frame.height > MXC_JPEG_MAX_HEIGHT) {
  		dev_err(dev, "JPEG width or height should be <= 8192: %dx%d\n",
  			header.frame.width, header.frame.height);
  		return -EINVAL;
  	}
  	if (header.frame.width < MXC_JPEG_MIN_WIDTH ||
  	    header.frame.height < MXC_JPEG_MIN_HEIGHT) {
  		dev_err(dev, "JPEG width or height should be > 64: %dx%d\n",
  			header.frame.width, header.frame.height);
  		return -EINVAL;
  	}
  	if (header.frame.num_components > V4L2_JPEG_MAX_COMPONENTS) {
  		dev_err(dev, "JPEG number of components should be <=%d",
  			V4L2_JPEG_MAX_COMPONENTS);
  		return -EINVAL;
  	}
  	/* check and, if necessary, patch component IDs*/
  	psof = (struct mxc_jpeg_sof *)header.sof.start;
  	psos = (struct mxc_jpeg_sos *)header.sos.start;
  	if (!mxc_jpeg_valid_comp_id(dev, psof, psos))
  		dev_warn(dev, "JPEG component ids should be 0-3 or 1-4");
  
  	fourcc = mxc_jpeg_get_image_format(dev, &header);
  	if (fourcc == 0)
  		return -EINVAL;
  
  	/*
  	 * set-up the capture queue with the pixelformat and resolution
  	 * detected from the jpeg output stream
  	 */
  	q_data_cap = mxc_jpeg_get_q_data(ctx, cap_type);
  	if (q_data_cap->w != header.frame.width ||
  	    q_data_cap->h != header.frame.height)
  		src_chg = true;
  	q_data_cap->w = header.frame.width;
  	q_data_cap->h = header.frame.height;
  	q_data_cap->fmt = mxc_jpeg_find_format(ctx, fourcc);
  	q_data_cap->w_adjusted = q_data_cap->w;
  	q_data_cap->h_adjusted = q_data_cap->h;
  	/*
  	 * align up the resolution for CAST IP,
  	 * but leave the buffer resolution unchanged
  	 */
  	v4l_bound_align_image(&q_data_cap->w_adjusted,
  			      q_data_cap->w_adjusted,  /* adjust up */
  			      MXC_JPEG_MAX_WIDTH,
  			      q_data_cap->fmt->h_align,
  			      &q_data_cap->h_adjusted,
  			      q_data_cap->h_adjusted, /* adjust up */
  			      MXC_JPEG_MAX_HEIGHT,
  			      q_data_cap->fmt->v_align,
  			      0);
  	dev_dbg(dev, "Detected jpeg res=(%dx%d)->(%dx%d), pixfmt=%c%c%c%c\n",
  		q_data_cap->w, q_data_cap->h,
  		q_data_cap->w_adjusted, q_data_cap->h_adjusted,
  		(fourcc & 0xff),
  		(fourcc >>  8) & 0xff,
  		(fourcc >> 16) & 0xff,
  		(fourcc >> 24) & 0xff);
  
  	/* setup bytesperline/sizeimage for capture queue */
  	mxc_jpeg_bytesperline(q_data_cap, header.frame.precision);
  	mxc_jpeg_sizeimage(q_data_cap);
  
  	/*
  	 * if the CAPTURE format was updated with new values, regardless of
  	 * whether they match the values set by the client or not, signal
  	 * a source change event
  	 */
  	if (src_chg)
  		notify_src_chg(ctx);
  
  	return 0;
  }
  
  static void mxc_jpeg_buf_queue(struct vb2_buffer *vb)
  {
  	int ret;
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  	struct mxc_jpeg_src_buf *jpeg_src_buf;
  
  	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
  		goto end;
  
  	/* for V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE */
  	if (ctx->mxc_jpeg->mode != MXC_JPEG_DECODE)
  		goto end;
  
  	jpeg_src_buf = vb2_to_mxc_buf(vb);
  	jpeg_src_buf->jpeg_parse_error = false;
  	ret = mxc_jpeg_parse(ctx,
  			     (u8 *)vb2_plane_vaddr(vb, 0),
  			     vb2_get_plane_payload(vb, 0),
  			     &jpeg_src_buf->dht_needed);
  	if (ret)
  		jpeg_src_buf->jpeg_parse_error = true;
  
  end:
  	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
  }
  
  static int mxc_jpeg_buf_out_validate(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  
  	vbuf->field = V4L2_FIELD_NONE;
  
  	return 0;
  }
  
  static int mxc_jpeg_buf_prepare(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  	struct mxc_jpeg_q_data *q_data = NULL;
  	struct device *dev = ctx->mxc_jpeg->dev;
  	unsigned long sizeimage;
  	int i;
  
  	vbuf->field = V4L2_FIELD_NONE;
  
  	q_data = mxc_jpeg_get_q_data(ctx, vb->vb2_queue->type);
  	if (!q_data)
  		return -EINVAL;
  	for (i = 0; i < q_data->fmt->colplanes; i++) {
  		sizeimage = q_data->sizeimage[i];
  		if (vb2_plane_size(vb, i) < sizeimage) {
  			dev_err(dev, "plane %d too small (%lu < %lu)",
  				i, vb2_plane_size(vb, i), sizeimage);
  			return -EINVAL;
  		}
  		vb2_set_plane_payload(vb, i, sizeimage);
  	}
  	return 0;
  }
  
  static void mxc_jpeg_buf_finish(struct vb2_buffer *vb)
  {
  	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
  	struct mxc_jpeg_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
  	struct vb2_queue *q = vb->vb2_queue;
  
  	if (V4L2_TYPE_IS_OUTPUT(vb->type))
  		return;
  	if (!ctx->stopped)
  		return;
  	if (list_empty(&q->done_list)) {
  		vbuf->flags |= V4L2_BUF_FLAG_LAST;
  		ctx->stopped = 0;
  	}
  }
  
  static const struct vb2_ops mxc_jpeg_qops = {
  	.queue_setup		= mxc_jpeg_queue_setup,
  	.wait_prepare		= vb2_ops_wait_prepare,
  	.wait_finish		= vb2_ops_wait_finish,
  	.buf_out_validate	= mxc_jpeg_buf_out_validate,
  	.buf_prepare		= mxc_jpeg_buf_prepare,
  	.buf_finish             = mxc_jpeg_buf_finish,
  	.start_streaming	= mxc_jpeg_start_streaming,
  	.stop_streaming		= mxc_jpeg_stop_streaming,
  	.buf_queue		= mxc_jpeg_buf_queue,
  };
  
  static int mxc_jpeg_queue_init(void *priv, struct vb2_queue *src_vq,
  			       struct vb2_queue *dst_vq)
  {
  	struct mxc_jpeg_ctx *ctx = priv;
  	int ret;
  
  	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
  	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
  	src_vq->drv_priv = ctx;
  	src_vq->buf_struct_size = sizeof(struct mxc_jpeg_src_buf);
  	src_vq->ops = &mxc_jpeg_qops;
  	src_vq->mem_ops = &vb2_dma_contig_memops;
  	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
  	src_vq->lock = &ctx->mxc_jpeg->lock;
  	src_vq->dev = ctx->mxc_jpeg->dev;
  	src_vq->allow_zero_bytesused = 1; /* keep old userspace apps working */
  
  	ret = vb2_queue_init(src_vq);
  	if (ret)
  		return ret;
  
  	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
  	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
  	dst_vq->drv_priv = ctx;
  	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
  	dst_vq->ops = &mxc_jpeg_qops;
  	dst_vq->mem_ops = &vb2_dma_contig_memops;
  	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
  	dst_vq->lock = &ctx->mxc_jpeg->lock;
  	dst_vq->dev = ctx->mxc_jpeg->dev;
  
  	ret = vb2_queue_init(dst_vq);
  	return ret;
  }
  
  static void mxc_jpeg_set_default_params(struct mxc_jpeg_ctx *ctx)
  {
  	struct mxc_jpeg_q_data *out_q = &ctx->out_q;
  	struct mxc_jpeg_q_data *cap_q = &ctx->cap_q;
  	struct mxc_jpeg_q_data *q[2] = {out_q, cap_q};
  	int i;
  
  	if (ctx->mxc_jpeg->mode == MXC_JPEG_ENCODE) {
  		out_q->fmt = mxc_jpeg_find_format(ctx, MXC_JPEG_DEFAULT_PFMT);
  		cap_q->fmt = mxc_jpeg_find_format(ctx, V4L2_PIX_FMT_JPEG);
  	} else {
  		out_q->fmt = mxc_jpeg_find_format(ctx, V4L2_PIX_FMT_JPEG);
  		cap_q->fmt = mxc_jpeg_find_format(ctx, MXC_JPEG_DEFAULT_PFMT);
  	}
  
  	for (i = 0; i < 2; i++) {
  		q[i]->w = MXC_JPEG_DEFAULT_WIDTH;
  		q[i]->h = MXC_JPEG_DEFAULT_HEIGHT;
  		q[i]->w_adjusted = MXC_JPEG_DEFAULT_WIDTH;
  		q[i]->h_adjusted = MXC_JPEG_DEFAULT_HEIGHT;
  		mxc_jpeg_bytesperline(q[i], 8);
  		mxc_jpeg_sizeimage(q[i]);
  	}
  }
  
  static int mxc_jpeg_open(struct file *file)
  {
  	struct mxc_jpeg_dev *mxc_jpeg = video_drvdata(file);
  	struct video_device *mxc_vfd = video_devdata(file);
  	struct device *dev = mxc_jpeg->dev;
  	struct mxc_jpeg_ctx *ctx;
  	int ret = 0;
  
  	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
  	if (!ctx)
  		return -ENOMEM;
  
  	if (mutex_lock_interruptible(&mxc_jpeg->lock)) {
  		ret = -ERESTARTSYS;
  		goto free;
  	}
  
  	v4l2_fh_init(&ctx->fh, mxc_vfd);
  	file->private_data = &ctx->fh;
  	v4l2_fh_add(&ctx->fh);
  
  	ctx->mxc_jpeg = mxc_jpeg;
  
  	ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(mxc_jpeg->m2m_dev, ctx,
  					    mxc_jpeg_queue_init);
  
  	if (IS_ERR(ctx->fh.m2m_ctx)) {
  		ret = PTR_ERR(ctx->fh.m2m_ctx);
  		goto error;
  	}
  
  	mxc_jpeg_set_default_params(ctx);
  	ctx->slot = MXC_MAX_SLOTS; /* slot not allocated yet */
  
  	if (mxc_jpeg->mode == MXC_JPEG_DECODE)
  		dev_dbg(dev, "Opened JPEG decoder instance %p\n", ctx);
  	else
  		dev_dbg(dev, "Opened JPEG encoder instance %p\n", ctx);
  	mutex_unlock(&mxc_jpeg->lock);
  
  	return 0;
  
  error:
  	v4l2_fh_del(&ctx->fh);
  	v4l2_fh_exit(&ctx->fh);
  	mutex_unlock(&mxc_jpeg->lock);
  free:
  	kfree(ctx);
  	return ret;
  }
  
  static int mxc_jpeg_querycap(struct file *file, void *priv,
  			     struct v4l2_capability *cap)
  {
  	struct mxc_jpeg_dev *mxc_jpeg = video_drvdata(file);
  
  	strscpy(cap->driver, MXC_JPEG_NAME " codec", sizeof(cap->driver));
  	strscpy(cap->card, MXC_JPEG_NAME " codec", sizeof(cap->card));
  	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
  		 dev_name(mxc_jpeg->dev));
  	cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
  	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
  
  	return 0;
  }
  
  static int mxc_jpeg_enum_fmt_vid_cap(struct file *file, void *priv,
  				     struct v4l2_fmtdesc *f)
  {
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
  
  	if (ctx->mxc_jpeg->mode == MXC_JPEG_ENCODE)
  		return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
  			MXC_JPEG_FMT_TYPE_ENC);
  	else
  		return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
  			MXC_JPEG_FMT_TYPE_RAW);
  }
  
  static int mxc_jpeg_enum_fmt_vid_out(struct file *file, void *priv,
  				     struct v4l2_fmtdesc *f)
  {
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
  
  	if (ctx->mxc_jpeg->mode == MXC_JPEG_DECODE)
  		return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
  				MXC_JPEG_FMT_TYPE_ENC);
  	else
  		return enum_fmt(mxc_formats, MXC_JPEG_NUM_FORMATS, f,
  				MXC_JPEG_FMT_TYPE_RAW);
  }
  
  static int mxc_jpeg_try_fmt(struct v4l2_format *f, const struct mxc_jpeg_fmt *fmt,
  			    struct mxc_jpeg_ctx *ctx, int q_type)
  {
  	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
  	struct v4l2_plane_pix_format *pfmt;
  	u32 w = (pix_mp->width < MXC_JPEG_MAX_WIDTH) ?
  		 pix_mp->width : MXC_JPEG_MAX_WIDTH;
  	u32 h = (pix_mp->height < MXC_JPEG_MAX_HEIGHT) ?
  		 pix_mp->height : MXC_JPEG_MAX_HEIGHT;
  	int i;
  	struct mxc_jpeg_q_data tmp_q;
  
  	memset(pix_mp->reserved, 0, sizeof(pix_mp->reserved));
  	pix_mp->field = V4L2_FIELD_NONE;
  	pix_mp->num_planes = fmt->colplanes;
  	pix_mp->pixelformat = fmt->fourcc;
  
  	/*
  	 * use MXC_JPEG_H_ALIGN instead of fmt->v_align, for vertical
  	 * alignment, to loosen up the alignment to multiple of 8,
  	 * otherwise NV12-1080p fails as 1080 is not a multiple of 16
  	 */
  	v4l_bound_align_image(&w,
  			      MXC_JPEG_MIN_WIDTH,
  			      w, /* adjust downwards*/
  			      fmt->h_align,
  			      &h,
  			      MXC_JPEG_MIN_HEIGHT,
  			      h, /* adjust downwards*/
  			      MXC_JPEG_H_ALIGN,
  			      0);
  	pix_mp->width = w; /* negotiate the width */
  	pix_mp->height = h; /* negotiate the height */
  
  	/* get user input into the tmp_q */
  	tmp_q.w = w;
  	tmp_q.h = h;
  	tmp_q.fmt = fmt;
  	for (i = 0; i < pix_mp->num_planes; i++) {
  		pfmt = &pix_mp->plane_fmt[i];
  		tmp_q.bytesperline[i] = pfmt->bytesperline;
  		tmp_q.sizeimage[i] = pfmt->sizeimage;
  	}
  
  	/* calculate bytesperline & sizeimage into the tmp_q */
  	mxc_jpeg_bytesperline(&tmp_q, 8);
  	mxc_jpeg_sizeimage(&tmp_q);
  
  	/* adjust user format according to our calculations */
  	for (i = 0; i < pix_mp->num_planes; i++) {
  		pfmt = &pix_mp->plane_fmt[i];
  		memset(pfmt->reserved, 0, sizeof(pfmt->reserved));
  		pfmt->bytesperline = tmp_q.bytesperline[i];
  		pfmt->sizeimage = tmp_q.sizeimage[i];
  	}
  
  	/* fix colorspace information to sRGB for both output & capture */
  	pix_mp->colorspace = V4L2_COLORSPACE_SRGB;
  	pix_mp->ycbcr_enc = V4L2_YCBCR_ENC_601;
  	pix_mp->xfer_func = V4L2_XFER_FUNC_SRGB;
  	/*
  	 * this hardware does not change the range of the samples
  	 * but since inside JPEG the YUV quantization is full-range,
  	 * this driver will always use full-range for the raw frames, too
  	 */
  	pix_mp->quantization = V4L2_QUANTIZATION_FULL_RANGE;
  
  	return 0;
  }
  
  static int mxc_jpeg_try_fmt_vid_cap(struct file *file, void *priv,
  				    struct v4l2_format *f)
  {
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
  	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
  	struct device *dev = jpeg->dev;
  	const struct mxc_jpeg_fmt *fmt;
  	u32 fourcc = f->fmt.pix_mp.pixelformat;
  
  	int q_type = (jpeg->mode == MXC_JPEG_DECODE) ?
  		     MXC_JPEG_FMT_TYPE_RAW : MXC_JPEG_FMT_TYPE_ENC;
  
  	if (!V4L2_TYPE_IS_MULTIPLANAR(f->type)) {
  		dev_err(dev, "TRY_FMT with Invalid type: %d\n", f->type);
  		return -EINVAL;
  	}
  
  	fmt = mxc_jpeg_find_format(ctx, fourcc);
  	if (!fmt || fmt->flags != q_type) {
  		dev_warn(dev, "Format not supported: %c%c%c%c, use the default.\n",
  			 (fourcc & 0xff),
  			 (fourcc >>  8) & 0xff,
  			 (fourcc >> 16) & 0xff,
  			 (fourcc >> 24) & 0xff);
  		f->fmt.pix_mp.pixelformat = (jpeg->mode == MXC_JPEG_DECODE) ?
  				MXC_JPEG_DEFAULT_PFMT : V4L2_PIX_FMT_JPEG;
  		fmt = mxc_jpeg_find_format(ctx, f->fmt.pix_mp.pixelformat);
  	}
  	return mxc_jpeg_try_fmt(f, fmt, ctx, q_type);
  }
  
  static int mxc_jpeg_try_fmt_vid_out(struct file *file, void *priv,
  				    struct v4l2_format *f)
  {
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
  	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
  	struct device *dev = jpeg->dev;
  	const struct mxc_jpeg_fmt *fmt;
  	u32 fourcc = f->fmt.pix_mp.pixelformat;
  
  	int q_type = (jpeg->mode == MXC_JPEG_ENCODE) ?
  		     MXC_JPEG_FMT_TYPE_RAW : MXC_JPEG_FMT_TYPE_ENC;
  
  	if (!V4L2_TYPE_IS_MULTIPLANAR(f->type)) {
  		dev_err(dev, "TRY_FMT with Invalid type: %d\n", f->type);
  		return -EINVAL;
  	}
  
  	fmt = mxc_jpeg_find_format(ctx, fourcc);
  	if (!fmt || fmt->flags != q_type) {
  		dev_warn(dev, "Format not supported: %c%c%c%c, use the default.\n",
  			 (fourcc & 0xff),
  			 (fourcc >>  8) & 0xff,
  			 (fourcc >> 16) & 0xff,
  			 (fourcc >> 24) & 0xff);
  		f->fmt.pix_mp.pixelformat = (jpeg->mode == MXC_JPEG_ENCODE) ?
  				MXC_JPEG_DEFAULT_PFMT : V4L2_PIX_FMT_JPEG;
  		fmt = mxc_jpeg_find_format(ctx, f->fmt.pix_mp.pixelformat);
  	}
  	return mxc_jpeg_try_fmt(f, fmt, ctx, q_type);
  }
  
  static int mxc_jpeg_s_fmt(struct mxc_jpeg_ctx *ctx,
  			  struct v4l2_format *f)
  {
  	struct vb2_queue *vq;
  	struct mxc_jpeg_q_data *q_data = NULL;
  	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
  	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
  	int i;
  
  	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
  	if (!vq)
  		return -EINVAL;
  
  	q_data = mxc_jpeg_get_q_data(ctx, f->type);
  
  	if (vb2_is_busy(vq)) {
  		v4l2_err(&jpeg->v4l2_dev, "queue busy\n");
  		return -EBUSY;
  	}
  
  	q_data->fmt = mxc_jpeg_find_format(ctx, pix_mp->pixelformat);
  	q_data->w = pix_mp->width;
  	q_data->h = pix_mp->height;
  
  	q_data->w_adjusted = q_data->w;
  	q_data->h_adjusted = q_data->h;
  	if (jpeg->mode == MXC_JPEG_DECODE) {
  		/*
  		 * align up the resolution for CAST IP,
  		 * but leave the buffer resolution unchanged
  		 */
  		v4l_bound_align_image(&q_data->w_adjusted,
  				      q_data->w_adjusted,  /* adjust upwards */
  				      MXC_JPEG_MAX_WIDTH,
  				      q_data->fmt->h_align,
  				      &q_data->h_adjusted,
  				      q_data->h_adjusted, /* adjust upwards */
  				      MXC_JPEG_MAX_HEIGHT,
  				      q_data->fmt->v_align,
  				      0);
  	} else {
  		/*
  		 * align down the resolution for CAST IP,
  		 * but leave the buffer resolution unchanged
  		 */
  		v4l_bound_align_image(&q_data->w_adjusted,
  				      MXC_JPEG_MIN_WIDTH,
  				      q_data->w_adjusted, /* adjust downwards*/
  				      q_data->fmt->h_align,
  				      &q_data->h_adjusted,
  				      MXC_JPEG_MIN_HEIGHT,
  				      q_data->h_adjusted, /* adjust downwards*/
  				      q_data->fmt->v_align,
  				      0);
  	}
  
  	for (i = 0; i < pix_mp->num_planes; i++) {
  		q_data->bytesperline[i] = pix_mp->plane_fmt[i].bytesperline;
  		q_data->sizeimage[i] = pix_mp->plane_fmt[i].sizeimage;
  	}
  
  	return 0;
  }
  
  static int mxc_jpeg_s_fmt_vid_cap(struct file *file, void *priv,
  				  struct v4l2_format *f)
  {
  	int ret;
  
  	ret = mxc_jpeg_try_fmt_vid_cap(file, priv, f);
  	if (ret)
  		return ret;
  
  	return mxc_jpeg_s_fmt(mxc_jpeg_fh_to_ctx(priv), f);
  }
  
  static int mxc_jpeg_s_fmt_vid_out(struct file *file, void *priv,
  				  struct v4l2_format *f)
  {
  	int ret;
  
  	ret = mxc_jpeg_try_fmt_vid_out(file, priv, f);
  	if (ret)
  		return ret;
  
  	return mxc_jpeg_s_fmt(mxc_jpeg_fh_to_ctx(priv), f);
  }
  
  static int mxc_jpeg_g_fmt_vid(struct file *file, void *priv,
  			      struct v4l2_format *f)
  {
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
  	struct mxc_jpeg_dev *jpeg = ctx->mxc_jpeg;
  	struct device *dev = jpeg->dev;
  	struct v4l2_pix_format_mplane   *pix_mp = &f->fmt.pix_mp;
  	struct mxc_jpeg_q_data *q_data = mxc_jpeg_get_q_data(ctx, f->type);
  	int i;
  
  	if (!V4L2_TYPE_IS_MULTIPLANAR(f->type)) {
  		dev_err(dev, "G_FMT with Invalid type: %d\n", f->type);
  		return -EINVAL;
  	}
  
  	pix_mp->pixelformat = q_data->fmt->fourcc;
  	pix_mp->width = q_data->w;
  	pix_mp->height = q_data->h;
  	pix_mp->field = V4L2_FIELD_NONE;
  
  	/* fix colorspace information to sRGB for both output & capture */
  	pix_mp->colorspace = V4L2_COLORSPACE_SRGB;
  	pix_mp->ycbcr_enc = V4L2_YCBCR_ENC_601;
  	pix_mp->xfer_func = V4L2_XFER_FUNC_SRGB;
  	pix_mp->quantization = V4L2_QUANTIZATION_FULL_RANGE;
  
  	pix_mp->num_planes = q_data->fmt->colplanes;
  	for (i = 0; i < pix_mp->num_planes; i++) {
  		pix_mp->plane_fmt[i].bytesperline = q_data->bytesperline[i];
  		pix_mp->plane_fmt[i].sizeimage = q_data->sizeimage[i];
  	}
  
  	return 0;
  }
  
  static int mxc_jpeg_subscribe_event(struct v4l2_fh *fh,
  				    const struct v4l2_event_subscription *sub)
  {
  	switch (sub->type) {
  	case V4L2_EVENT_EOS:
  		return v4l2_event_subscribe(fh, sub, 0, NULL);
  	case V4L2_EVENT_SOURCE_CHANGE:
  		return v4l2_src_change_event_subscribe(fh, sub);
  	default:
  		return -EINVAL;
  	}
  }
  
  static int mxc_jpeg_dqbuf(struct file *file, void *priv,
  			  struct v4l2_buffer *buf)
  {
  	struct v4l2_fh *fh = file->private_data;
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(priv);
  	struct device *dev = ctx->mxc_jpeg->dev;
  	int num_src_ready = v4l2_m2m_num_src_bufs_ready(fh->m2m_ctx);
  	int ret;
  
  	dev_dbg(dev, "DQBUF type=%d, index=%d", buf->type, buf->index);
  	if (ctx->stopping == 1 && num_src_ready == 0) {
  		/* No more src bufs, notify app EOS */
  		notify_eos(ctx);
  		ctx->stopping = 0;
  		mxc_jpeg_set_last_buffer_dequeued(ctx);
  	}
  
  	ret = v4l2_m2m_dqbuf(file, fh->m2m_ctx, buf);
  	return ret;
  }
  
  static const struct v4l2_ioctl_ops mxc_jpeg_ioctl_ops = {
  	.vidioc_querycap		= mxc_jpeg_querycap,
  	.vidioc_enum_fmt_vid_cap	= mxc_jpeg_enum_fmt_vid_cap,
  	.vidioc_enum_fmt_vid_out	= mxc_jpeg_enum_fmt_vid_out,
  
  	.vidioc_try_fmt_vid_cap_mplane	= mxc_jpeg_try_fmt_vid_cap,
  	.vidioc_try_fmt_vid_out_mplane	= mxc_jpeg_try_fmt_vid_out,
  
  	.vidioc_s_fmt_vid_cap_mplane	= mxc_jpeg_s_fmt_vid_cap,
  	.vidioc_s_fmt_vid_out_mplane	= mxc_jpeg_s_fmt_vid_out,
  
  	.vidioc_g_fmt_vid_cap_mplane	= mxc_jpeg_g_fmt_vid,
  	.vidioc_g_fmt_vid_out_mplane	= mxc_jpeg_g_fmt_vid,
  
  	.vidioc_subscribe_event		= mxc_jpeg_subscribe_event,
  	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
  
  	.vidioc_try_decoder_cmd		= v4l2_m2m_ioctl_try_decoder_cmd,
  	.vidioc_decoder_cmd		= mxc_jpeg_decoder_cmd,
  	.vidioc_try_encoder_cmd		= v4l2_m2m_ioctl_try_encoder_cmd,
  	.vidioc_encoder_cmd		= mxc_jpeg_encoder_cmd,
  
  	.vidioc_qbuf			= v4l2_m2m_ioctl_qbuf,
  	.vidioc_dqbuf			= mxc_jpeg_dqbuf,
  
  	.vidioc_create_bufs		= v4l2_m2m_ioctl_create_bufs,
  	.vidioc_prepare_buf		= v4l2_m2m_ioctl_prepare_buf,
  	.vidioc_reqbufs			= v4l2_m2m_ioctl_reqbufs,
  	.vidioc_querybuf		= v4l2_m2m_ioctl_querybuf,
  	.vidioc_expbuf			= v4l2_m2m_ioctl_expbuf,
  	.vidioc_streamon		= v4l2_m2m_ioctl_streamon,
  	.vidioc_streamoff		= v4l2_m2m_ioctl_streamoff,
  };
  
  static int mxc_jpeg_release(struct file *file)
  {
  	struct mxc_jpeg_dev *mxc_jpeg = video_drvdata(file);
  	struct mxc_jpeg_ctx *ctx = mxc_jpeg_fh_to_ctx(file->private_data);
  	struct device *dev = mxc_jpeg->dev;
  
  	mutex_lock(&mxc_jpeg->lock);
  	if (mxc_jpeg->mode == MXC_JPEG_DECODE)
  		dev_dbg(dev, "Release JPEG decoder instance on slot %d.",
  			ctx->slot);
  	else
  		dev_dbg(dev, "Release JPEG encoder instance on slot %d.",
  			ctx->slot);
  	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
  	v4l2_fh_del(&ctx->fh);
  	v4l2_fh_exit(&ctx->fh);
  	kfree(ctx);
  	mutex_unlock(&mxc_jpeg->lock);
  
  	return 0;
  }
  
  static const struct v4l2_file_operations mxc_jpeg_fops = {
  	.owner		= THIS_MODULE,
  	.open		= mxc_jpeg_open,
  	.release	= mxc_jpeg_release,
  	.poll		= v4l2_m2m_fop_poll,
  	.unlocked_ioctl	= video_ioctl2,
  	.mmap		= v4l2_m2m_fop_mmap,
  };
  
  static const struct v4l2_m2m_ops mxc_jpeg_m2m_ops = {
  	.device_run	= mxc_jpeg_device_run,
  };
  
  static void mxc_jpeg_detach_pm_domains(struct mxc_jpeg_dev *jpeg)
  {
  	int i;
  
  	for (i = 0; i < jpeg->num_domains; i++) {
  		if (jpeg->pd_link[i] && !IS_ERR(jpeg->pd_link[i]))
  			device_link_del(jpeg->pd_link[i]);
  		if (jpeg->pd_dev[i] && !IS_ERR(jpeg->pd_dev[i]))
  			dev_pm_domain_detach(jpeg->pd_dev[i], true);
  		jpeg->pd_dev[i] = NULL;
  		jpeg->pd_link[i] = NULL;
  	}
  }
  
  static int mxc_jpeg_attach_pm_domains(struct mxc_jpeg_dev *jpeg)
  {
  	struct device *dev = jpeg->dev;
  	struct device_node *np = jpeg->pdev->dev.of_node;
  	int i;
  	int ret;
  
  	jpeg->num_domains = of_count_phandle_with_args(np, "power-domains",
  						       "#power-domain-cells");
  	if (jpeg->num_domains < 0) {
  		dev_err(dev, "No power domains defined for jpeg node\n");
  		return jpeg->num_domains;
  	}
  
  	jpeg->pd_dev = devm_kmalloc_array(dev, jpeg->num_domains,
  					  sizeof(*jpeg->pd_dev), GFP_KERNEL);
  	if (!jpeg->pd_dev)
  		return -ENOMEM;
  
  	jpeg->pd_link = devm_kmalloc_array(dev, jpeg->num_domains,
  					   sizeof(*jpeg->pd_link), GFP_KERNEL);
  	if (!jpeg->pd_link)
  		return -ENOMEM;
  
  	for (i = 0; i < jpeg->num_domains; i++) {
  		jpeg->pd_dev[i] = dev_pm_domain_attach_by_id(dev, i);
  		if (IS_ERR(jpeg->pd_dev[i])) {
  			ret = PTR_ERR(jpeg->pd_dev[i]);
  			goto fail;
  		}
  
  		jpeg->pd_link[i] = device_link_add(dev, jpeg->pd_dev[i],
  						   DL_FLAG_STATELESS |
  						   DL_FLAG_PM_RUNTIME);
  		if (!jpeg->pd_link[i]) {
  			ret = -EINVAL;
  			goto fail;
  		}
  	}
  
  	return 0;
  fail:
  	mxc_jpeg_detach_pm_domains(jpeg);
  	return ret;
  }
  
  static int mxc_jpeg_probe(struct platform_device *pdev)
  {
  	struct mxc_jpeg_dev *jpeg;
  	struct device *dev = &pdev->dev;
  	int dec_irq;
  	int ret;
  	int mode;
  	const struct of_device_id *of_id;
  	unsigned int slot;
  
  	of_id = of_match_node(mxc_jpeg_match, dev->of_node);
  	mode = *(const int *)of_id->data;
  
  	jpeg = devm_kzalloc(dev, sizeof(struct mxc_jpeg_dev), GFP_KERNEL);
  	if (!jpeg)
  		return -ENOMEM;
  
  	mutex_init(&jpeg->lock);
  	spin_lock_init(&jpeg->hw_lock);
  
  	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
  	if (ret) {
  		dev_err(&pdev->dev, "No suitable DMA available.\n");
  		goto err_irq;
  	}
  
  	jpeg->base_reg = devm_platform_ioremap_resource(pdev, 0);
  	if (IS_ERR(jpeg->base_reg))
  		return PTR_ERR(jpeg->base_reg);
  
  	for (slot = 0; slot < MXC_MAX_SLOTS; slot++) {
  		dec_irq = platform_get_irq(pdev, slot);
  		if (dec_irq < 0) {
  			ret = dec_irq;
  			goto err_irq;
  		}
  		ret = devm_request_irq(&pdev->dev, dec_irq, mxc_jpeg_dec_irq,
  				       0, pdev->name, jpeg);
  		if (ret) {
  			dev_err(&pdev->dev, "Failed to request irq %d (%d)\n",
  				dec_irq, ret);
  			goto err_irq;
  		}
  	}
  
  	jpeg->pdev = pdev;
  	jpeg->dev = dev;
  	jpeg->mode = mode;
  
  	/* Get clocks */
  	jpeg->clk_ipg = devm_clk_get(dev, "ipg");
  	if (IS_ERR(jpeg->clk_ipg)) {
  		dev_err(dev, "failed to get clock: ipg\n");
  		goto err_clk;
  	}
  
  	jpeg->clk_per = devm_clk_get(dev, "per");
  	if (IS_ERR(jpeg->clk_per)) {
  		dev_err(dev, "failed to get clock: per\n");
  		goto err_clk;
  	}
  
  	ret = mxc_jpeg_attach_pm_domains(jpeg);
  	if (ret < 0) {
  		dev_err(dev, "failed to attach power domains %d\n", ret);
  		return ret;
  	}
  
  	/* v4l2 */
  	ret = v4l2_device_register(dev, &jpeg->v4l2_dev);
  	if (ret) {
  		dev_err(dev, "failed to register v4l2 device\n");
  		goto err_register;
  	}
  	jpeg->m2m_dev = v4l2_m2m_init(&mxc_jpeg_m2m_ops);
  	if (IS_ERR(jpeg->m2m_dev)) {
  		dev_err(dev, "failed to register v4l2 device\n");
  		ret = PTR_ERR(jpeg->m2m_dev);
  		goto err_m2m;
  	}
  
  	jpeg->dec_vdev = video_device_alloc();
  	if (!jpeg->dec_vdev) {
  		dev_err(dev, "failed to register v4l2 device\n");
  		ret = -ENOMEM;
  		goto err_vdev_alloc;
  	}
  	if (mode == MXC_JPEG_ENCODE)
  		snprintf(jpeg->dec_vdev->name,
  			 sizeof(jpeg->dec_vdev->name),
  			 "%s-enc", MXC_JPEG_NAME);
  	else
  		snprintf(jpeg->dec_vdev->name,
  			 sizeof(jpeg->dec_vdev->name),
  			 "%s-dec", MXC_JPEG_NAME);
  
  	jpeg->dec_vdev->fops = &mxc_jpeg_fops;
  	jpeg->dec_vdev->ioctl_ops = &mxc_jpeg_ioctl_ops;
  	jpeg->dec_vdev->minor = -1;
  	jpeg->dec_vdev->release = video_device_release;
  	jpeg->dec_vdev->lock = &jpeg->lock; /* lock for ioctl serialization */
  	jpeg->dec_vdev->v4l2_dev = &jpeg->v4l2_dev;
  	jpeg->dec_vdev->vfl_dir = VFL_DIR_M2M;
  	jpeg->dec_vdev->device_caps = V4L2_CAP_STREAMING |
  					V4L2_CAP_VIDEO_M2M_MPLANE;
  	if (mode == MXC_JPEG_ENCODE) {
  		v4l2_disable_ioctl(jpeg->dec_vdev, VIDIOC_DECODER_CMD);
  		v4l2_disable_ioctl(jpeg->dec_vdev, VIDIOC_TRY_DECODER_CMD);
  	} else {
  		v4l2_disable_ioctl(jpeg->dec_vdev, VIDIOC_ENCODER_CMD);
  		v4l2_disable_ioctl(jpeg->dec_vdev, VIDIOC_TRY_ENCODER_CMD);
  	}
  	ret = video_register_device(jpeg->dec_vdev, VFL_TYPE_VIDEO, -1);
  	if (ret) {
  		dev_err(dev, "failed to register video device\n");
  		goto err_vdev_register;
  	}
  	video_set_drvdata(jpeg->dec_vdev, jpeg);
  	if (mode == MXC_JPEG_ENCODE)
  		v4l2_info(&jpeg->v4l2_dev,
  			  "encoder device registered as /dev/video%d (%d,%d)\n",
  			  jpeg->dec_vdev->num, VIDEO_MAJOR,
  			  jpeg->dec_vdev->minor);
  	else
  		v4l2_info(&jpeg->v4l2_dev,
  			  "decoder device registered as /dev/video%d (%d,%d)\n",
  			  jpeg->dec_vdev->num, VIDEO_MAJOR,
  			  jpeg->dec_vdev->minor);
  
  	platform_set_drvdata(pdev, jpeg);
  	pm_runtime_enable(dev);
  
  	return 0;
  
  err_vdev_register:
  	video_device_release(jpeg->dec_vdev);
  
  err_vdev_alloc:
  	v4l2_m2m_release(jpeg->m2m_dev);
  
  err_m2m:
  	v4l2_device_unregister(&jpeg->v4l2_dev);
  
  err_register:
  	mxc_jpeg_detach_pm_domains(jpeg);
  
  err_irq:
  err_clk:
  	return ret;
  }
  
  #ifdef CONFIG_PM
  static int mxc_jpeg_runtime_resume(struct device *dev)
  {
  	struct mxc_jpeg_dev *jpeg = dev_get_drvdata(dev);
  	int ret;
  
  	ret = clk_prepare_enable(jpeg->clk_ipg);
  	if (ret < 0) {
  		dev_err(dev, "failed to enable clock: ipg\n");
  		goto err_ipg;
  	}
  
  	ret = clk_prepare_enable(jpeg->clk_per);
  	if (ret < 0) {
  		dev_err(dev, "failed to enable clock: per\n");
  		goto err_per;
  	}
  
  	return 0;
  
  err_per:
  	clk_disable_unprepare(jpeg->clk_ipg);
  err_ipg:
  	return ret;
  }
  
  static int mxc_jpeg_runtime_suspend(struct device *dev)
  {
  	struct mxc_jpeg_dev *jpeg = dev_get_drvdata(dev);
  
  	clk_disable_unprepare(jpeg->clk_ipg);
  	clk_disable_unprepare(jpeg->clk_per);
  
  	return 0;
  }
  #endif
  
  static const struct dev_pm_ops	mxc_jpeg_pm_ops = {
  	SET_RUNTIME_PM_OPS(mxc_jpeg_runtime_suspend,
  			   mxc_jpeg_runtime_resume, NULL)
  };
  
  static int mxc_jpeg_remove(struct platform_device *pdev)
  {
  	unsigned int slot;
  	struct mxc_jpeg_dev *jpeg = platform_get_drvdata(pdev);
  
  	for (slot = 0; slot < MXC_MAX_SLOTS; slot++)
  		mxc_jpeg_free_slot_data(jpeg, slot);
  
  	pm_runtime_disable(&pdev->dev);
  	video_unregister_device(jpeg->dec_vdev);
  	v4l2_m2m_release(jpeg->m2m_dev);
  	v4l2_device_unregister(&jpeg->v4l2_dev);
  	mxc_jpeg_detach_pm_domains(jpeg);
  
  	return 0;
  }
  
  MODULE_DEVICE_TABLE(of, mxc_jpeg_match);
  
  static struct platform_driver mxc_jpeg_driver = {
  	.probe = mxc_jpeg_probe,
  	.remove = mxc_jpeg_remove,
  	.driver = {
  		.name = "mxc-jpeg",
  		.of_match_table = mxc_jpeg_match,
  		.pm = &mxc_jpeg_pm_ops,
  	},
  };
  module_platform_driver(mxc_jpeg_driver);
  
  MODULE_AUTHOR("Zhengyu Shen <zhengyu.shen_1@nxp.com>");
  MODULE_AUTHOR("Mirela Rabulea <mirela.rabulea@nxp.com>");
  MODULE_DESCRIPTION("V4L2 driver for i.MX8 QXP/QM JPEG encoder/decoder");
  MODULE_LICENSE("GPL v2");
  