text: /*
   * hdmi.c
   *
   * HDMI interface DSS driver setting for TI's OMAP4 family of processor.
   * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
   * Authors: Yong Zhi
   *	Mythri pk <mythripk@ti.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.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #define DSS_SUBSYS_NAME "HDMI"
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/err.h>
  #include <linux/io.h>
  #include <linux/interrupt.h>
  #include <linux/mutex.h>
  #include <linux/delay.h>
  #include <linux/string.h>
  #include <linux/platform_device.h>
  #include <linux/pm_runtime.h>
  #include <linux/clk.h>
  #include <video/omapdss.h>
  
  #include "ti_hdmi.h"
  #include "dss.h"
  #include "dss_features.h"
  
  #define HDMI_WP			0x0
  #define HDMI_CORE_SYS		0x400
  #define HDMI_CORE_AV		0x900
  #define HDMI_PLLCTRL		0x200
  #define HDMI_PHY		0x300
  
  /* HDMI EDID Length move this */
  #define HDMI_EDID_MAX_LENGTH			256
  #define EDID_TIMING_DESCRIPTOR_SIZE		0x12
  #define EDID_DESCRIPTOR_BLOCK0_ADDRESS		0x36
  #define EDID_DESCRIPTOR_BLOCK1_ADDRESS		0x80
  #define EDID_SIZE_BLOCK0_TIMING_DESCRIPTOR	4
  #define EDID_SIZE_BLOCK1_TIMING_DESCRIPTOR	4
  
  #define HDMI_DEFAULT_REGN 16
  #define HDMI_DEFAULT_REGM2 1
  
  static struct {
  	struct mutex lock;
  	struct platform_device *pdev;
  	struct hdmi_ip_data ip_data;
  
  	struct clk *sys_clk;
  } hdmi;
  
  /*
   * Logic for the below structure :
   * user enters the CEA or VESA timings by specifying the HDMI/DVI code.
   * There is a correspondence between CEA/VESA timing and code, please
   * refer to section 6.3 in HDMI 1.3 specification for timing code.
   *
   * In the below structure, cea_vesa_timings corresponds to all OMAP4
   * supported CEA and VESA timing values.code_cea corresponds to the CEA
   * code, It is used to get the timing from cea_vesa_timing array.Similarly
   * with code_vesa. Code_index is used for back mapping, that is once EDID
   * is read from the TV, EDID is parsed to find the timing values and then
   * map it to corresponding CEA or VESA index.
   */
  
  static const struct hdmi_config cea_timings[] = {
  	{
  		{ 640, 480, 25200, 96, 16, 48, 2, 10, 33,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 1, HDMI_HDMI },
  	},
  	{
  		{ 720, 480, 27027, 62, 16, 60, 6, 9, 30,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 2, HDMI_HDMI },
  	},
  	{
  		{ 1280, 720, 74250, 40, 110, 220, 5, 5, 20,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 4, HDMI_HDMI },
  	},
  	{
  		{ 1920, 540, 74250, 44, 88, 148, 5, 2, 15,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			true, },
  		{ 5, HDMI_HDMI },
  	},
  	{
  		{ 1440, 240, 27027, 124, 38, 114, 3, 4, 15,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			true, },
  		{ 6, HDMI_HDMI },
  	},
  	{
  		{ 1920, 1080, 148500, 44, 88, 148, 5, 4, 36,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 16, HDMI_HDMI },
  	},
  	{
  		{ 720, 576, 27000, 64, 12, 68, 5, 5, 39,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 17, HDMI_HDMI },
  	},
  	{
  		{ 1280, 720, 74250, 40, 440, 220, 5, 5, 20,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 19, HDMI_HDMI },
  	},
  	{
  		{ 1920, 540, 74250, 44, 528, 148, 5, 2, 15,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			true, },
  		{ 20, HDMI_HDMI },
  	},
  	{
  		{ 1440, 288, 27000, 126, 24, 138, 3, 2, 19,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			true, },
  		{ 21, HDMI_HDMI },
  	},
  	{
  		{ 1440, 576, 54000, 128, 24, 136, 5, 5, 39,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 29, HDMI_HDMI },
  	},
  	{
  		{ 1920, 1080, 148500, 44, 528, 148, 5, 4, 36,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 31, HDMI_HDMI },
  	},
  	{
  		{ 1920, 1080, 74250, 44, 638, 148, 5, 4, 36,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 32, HDMI_HDMI },
  	},
  	{
  		{ 2880, 480, 108108, 248, 64, 240, 6, 9, 30,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 35, HDMI_HDMI },
  	},
  	{
  		{ 2880, 576, 108000, 256, 48, 272, 5, 5, 39,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 37, HDMI_HDMI },
  	},
  };
  
  static const struct hdmi_config vesa_timings[] = {
  /* VESA From Here */
  	{
  		{ 640, 480, 25175, 96, 16, 48, 2, 11, 31,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 4, HDMI_DVI },
  	},
  	{
  		{ 800, 600, 40000, 128, 40, 88, 4, 1, 23,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 9, HDMI_DVI },
  	},
  	{
  		{ 848, 480, 33750, 112, 16, 112, 8, 6, 23,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0xE, HDMI_DVI },
  	},
  	{
  		{ 1280, 768, 79500, 128, 64, 192, 7, 3, 20,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 0x17, HDMI_DVI },
  	},
  	{
  		{ 1280, 800, 83500, 128, 72, 200, 6, 3, 22,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 0x1C, HDMI_DVI },
  	},
  	{
  		{ 1360, 768, 85500, 112, 64, 256, 6, 3, 18,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x27, HDMI_DVI },
  	},
  	{
  		{ 1280, 960, 108000, 112, 96, 312, 3, 1, 36,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x20, HDMI_DVI },
  	},
  	{
  		{ 1280, 1024, 108000, 112, 48, 248, 3, 1, 38,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x23, HDMI_DVI },
  	},
  	{
  		{ 1024, 768, 65000, 136, 24, 160, 6, 3, 29,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 0x10, HDMI_DVI },
  	},
  	{
  		{ 1400, 1050, 121750, 144, 88, 232, 4, 3, 32,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 0x2A, HDMI_DVI },
  	},
  	{
  		{ 1440, 900, 106500, 152, 80, 232, 6, 3, 25,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 0x2F, HDMI_DVI },
  	},
  	{
  		{ 1680, 1050, 146250, 176 , 104, 280, 6, 3, 30,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_LOW,
  			false, },
  		{ 0x3A, HDMI_DVI },
  	},
  	{
  		{ 1366, 768, 85500, 143, 70, 213, 3, 3, 24,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x51, HDMI_DVI },
  	},
  	{
  		{ 1920, 1080, 148500, 44, 148, 80, 5, 4, 36,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x52, HDMI_DVI },
  	},
  	{
  		{ 1280, 768, 68250, 32, 48, 80, 7, 3, 12,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x16, HDMI_DVI },
  	},
  	{
  		{ 1400, 1050, 101000, 32, 48, 80, 4, 3, 23,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x29, HDMI_DVI },
  	},
  	{
  		{ 1680, 1050, 119000, 32, 48, 80, 6, 3, 21,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x39, HDMI_DVI },
  	},
  	{
  		{ 1280, 800, 79500, 32, 48, 80, 6, 3, 14,
  			OMAPDSS_SIG_ACTIVE_LOW, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x1B, HDMI_DVI },
  	},
  	{
  		{ 1280, 720, 74250, 40, 110, 220, 5, 5, 20,
  			OMAPDSS_SIG_ACTIVE_HIGH, OMAPDSS_SIG_ACTIVE_HIGH,
  			false, },
  		{ 0x55, HDMI_DVI },
  	},
  };
  
  static int hdmi_runtime_get(void)
  {
  	int r;
  
  	DSSDBG("hdmi_runtime_get\n");
  
  	r = pm_runtime_get_sync(&hdmi.pdev->dev);
  	WARN_ON(r < 0);
  	if (r < 0)
  		return r;
  
  	return 0;
  }
  
  static void hdmi_runtime_put(void)
  {
  	int r;
  
  	DSSDBG("hdmi_runtime_put\n");
  
  	r = pm_runtime_put_sync(&hdmi.pdev->dev);
  	WARN_ON(r < 0 && r != -ENOSYS);
  }
  
  static int __init hdmi_init_display(struct omap_dss_device *dssdev)
  {
  	DSSDBG("init_display\n");
  
  	dss_init_hdmi_ip_ops(&hdmi.ip_data);
  	return 0;
  }
  
  static const struct hdmi_config *hdmi_find_timing(
  					const struct hdmi_config *timings_arr,
  					int len)
  {
  	int i;
  
  	for (i = 0; i < len; i++) {
  		if (timings_arr[i].cm.code == hdmi.ip_data.cfg.cm.code)
  			return &timings_arr[i];
  	}
  	return NULL;
  }
  
  static const struct hdmi_config *hdmi_get_timings(void)
  {
         const struct hdmi_config *arr;
         int len;
  
         if (hdmi.ip_data.cfg.cm.mode == HDMI_DVI) {
                 arr = vesa_timings;
                 len = ARRAY_SIZE(vesa_timings);
         } else {
                 arr = cea_timings;
                 len = ARRAY_SIZE(cea_timings);
         }
  
         return hdmi_find_timing(arr, len);
  }
  
  static bool hdmi_timings_compare(struct omap_video_timings *timing1,
  				const struct omap_video_timings *timing2)
  {
  	int timing1_vsync, timing1_hsync, timing2_vsync, timing2_hsync;
  
  	if ((timing2->pixel_clock == timing1->pixel_clock) &&
  		(timing2->x_res == timing1->x_res) &&
  		(timing2->y_res == timing1->y_res)) {
  
  		timing2_hsync = timing2->hfp + timing2->hsw + timing2->hbp;
  		timing1_hsync = timing1->hfp + timing1->hsw + timing1->hbp;
  		timing2_vsync = timing2->vfp + timing2->vsw + timing2->vbp;
  		timing1_vsync = timing2->vfp + timing2->vsw + timing2->vbp;
  
  		DSSDBG("timing1_hsync = %d timing1_vsync = %d"\
  			"timing2_hsync = %d timing2_vsync = %d\n",
  			timing1_hsync, timing1_vsync,
  			timing2_hsync, timing2_vsync);
  
  		if ((timing1_hsync == timing2_hsync) &&
  			(timing1_vsync == timing2_vsync)) {
  			return true;
  		}
  	}
  	return false;
  }
  
  static struct hdmi_cm hdmi_get_code(struct omap_video_timings *timing)
  {
  	int i;
  	struct hdmi_cm cm = {-1};
  	DSSDBG("hdmi_get_code\n");
  
  	for (i = 0; i < ARRAY_SIZE(cea_timings); i++) {
  		if (hdmi_timings_compare(timing, &cea_timings[i].timings)) {
  			cm = cea_timings[i].cm;
  			goto end;
  		}
  	}
  	for (i = 0; i < ARRAY_SIZE(vesa_timings); i++) {
  		if (hdmi_timings_compare(timing, &vesa_timings[i].timings)) {
  			cm = vesa_timings[i].cm;
  			goto end;
  		}
  	}
  
  end:	return cm;
  
  }
  
  unsigned long hdmi_get_pixel_clock(void)
  {
  	/* HDMI Pixel Clock in Mhz */
  	return hdmi.ip_data.cfg.timings.pixel_clock * 1000;
  }
  
  static void hdmi_compute_pll(struct omap_dss_device *dssdev, int phy,
  		struct hdmi_pll_info *pi)
  {
  	unsigned long clkin, refclk;
  	u32 mf;
  
  	clkin = clk_get_rate(hdmi.sys_clk) / 10000;
  	/*
  	 * Input clock is predivided by N + 1
  	 * out put of which is reference clk
  	 */
  	if (dssdev->clocks.hdmi.regn == 0)
  		pi->regn = HDMI_DEFAULT_REGN;
  	else
  		pi->regn = dssdev->clocks.hdmi.regn;
  
  	refclk = clkin / pi->regn;
  
  	if (dssdev->clocks.hdmi.regm2 == 0)
  		pi->regm2 = HDMI_DEFAULT_REGM2;
  	else
  		pi->regm2 = dssdev->clocks.hdmi.regm2;
  
  	/*
  	 * multiplier is pixel_clk/ref_clk
  	 * Multiplying by 100 to avoid fractional part removal
  	 */
  	pi->regm = phy * pi->regm2 / refclk;
  
  	/*
  	 * fractional multiplier is remainder of the difference between
  	 * multiplier and actual phy(required pixel clock thus should be
  	 * multiplied by 2^18(262144) divided by the reference clock
  	 */
  	mf = (phy - pi->regm / pi->regm2 * refclk) * 262144;
  	pi->regmf = pi->regm2 * mf / refclk;
  
  	/*
  	 * Dcofreq should be set to 1 if required pixel clock
  	 * is greater than 1000MHz
  	 */
  	pi->dcofreq = phy > 1000 * 100;
  	pi->regsd = ((pi->regm * clkin / 10) / (pi->regn * 250) + 5) / 10;
  
  	/* Set the reference clock to sysclk reference */
  	pi->refsel = HDMI_REFSEL_SYSCLK;
  
  	DSSDBG("M = %d Mf = %d\n", pi->regm, pi->regmf);
  	DSSDBG("range = %d sd = %d\n", pi->dcofreq, pi->regsd);
  }
  
  static int hdmi_power_on(struct omap_dss_device *dssdev)
  {
  	int r;
  	const struct hdmi_config *timing;
  	struct omap_video_timings *p;
  	unsigned long phy;
  
  	r = hdmi_runtime_get();
  	if (r)
  		return r;
  
  	dss_mgr_disable(dssdev->manager);
  
  	p = &dssdev->panel.timings;
  
  	DSSDBG("hdmi_power_on x_res= %d y_res = %d\n",
  		dssdev->panel.timings.x_res,
  		dssdev->panel.timings.y_res);
  
  	timing = hdmi_get_timings();
  	if (timing == NULL) {
  		/* HDMI code 4 corresponds to 640 * 480 VGA */
  		hdmi.ip_data.cfg.cm.code = 4;
  		/* DVI mode 1 corresponds to HDMI 0 to DVI */
  		hdmi.ip_data.cfg.cm.mode = HDMI_DVI;
  		hdmi.ip_data.cfg = vesa_timings[0];
  	} else {
  		hdmi.ip_data.cfg = *timing;
  	}
  	phy = p->pixel_clock;
  
  	hdmi_compute_pll(dssdev, phy, &hdmi.ip_data.pll_data);
  
  	hdmi.ip_data.ops->video_disable(&hdmi.ip_data);
  
  	/* config the PLL and PHY hdmi_set_pll_pwrfirst */
  	r = hdmi.ip_data.ops->pll_enable(&hdmi.ip_data);
  	if (r) {
  		DSSDBG("Failed to lock PLL\n");
  		goto err;
  	}
  
  	r = hdmi.ip_data.ops->phy_enable(&hdmi.ip_data);
  	if (r) {
  		DSSDBG("Failed to start PHY\n");
  		goto err;
  	}
  
  	hdmi.ip_data.ops->video_configure(&hdmi.ip_data);
  
  	/* Make selection of HDMI in DSS */
  	dss_select_hdmi_venc_clk_source(DSS_HDMI_M_PCLK);
  
  	/* Select the dispc clock source as PRCM clock, to ensure that it is not
  	 * DSI PLL source as the clock selected by DSI PLL might not be
  	 * sufficient for the resolution selected / that can be changed
  	 * dynamically by user. This can be moved to single location , say
  	 * Boardfile.
  	 */
  	dss_select_dispc_clk_source(dssdev->clocks.dispc.dispc_fclk_src);
  
  	/* bypass TV gamma table */
  	dispc_enable_gamma_table(0);
  
  	/* tv size */
  	dss_mgr_set_timings(dssdev->manager, &dssdev->panel.timings);
  
  	r = hdmi.ip_data.ops->video_enable(&hdmi.ip_data);
  	if (r)
  		goto err_vid_enable;
  
  	r = dss_mgr_enable(dssdev->manager);
  	if (r)
  		goto err_mgr_enable;
  
  	return 0;
  
  err_mgr_enable:
  	hdmi.ip_data.ops->video_disable(&hdmi.ip_data);
  err_vid_enable:
  	hdmi.ip_data.ops->phy_disable(&hdmi.ip_data);
  	hdmi.ip_data.ops->pll_disable(&hdmi.ip_data);
  err:
  	hdmi_runtime_put();
  	return -EIO;
  }
  
  static void hdmi_power_off(struct omap_dss_device *dssdev)
  {
  	dss_mgr_disable(dssdev->manager);
  
  	hdmi.ip_data.ops->video_disable(&hdmi.ip_data);
  	hdmi.ip_data.ops->phy_disable(&hdmi.ip_data);
  	hdmi.ip_data.ops->pll_disable(&hdmi.ip_data);
  	hdmi_runtime_put();
  }
  
  int omapdss_hdmi_display_check_timing(struct omap_dss_device *dssdev,
  					struct omap_video_timings *timings)
  {
  	struct hdmi_cm cm;
  
  	cm = hdmi_get_code(timings);
  	if (cm.code == -1) {
  		return -EINVAL;
  	}
  
  	return 0;
  
  }
  
  void omapdss_hdmi_display_set_timing(struct omap_dss_device *dssdev)
  {
  	struct hdmi_cm cm;
  
  	cm = hdmi_get_code(&dssdev->panel.timings);
  	hdmi.ip_data.cfg.cm.code = cm.code;
  	hdmi.ip_data.cfg.cm.mode = cm.mode;
  
  	if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
  		int r;
  
  		hdmi_power_off(dssdev);
  
  		r = hdmi_power_on(dssdev);
  		if (r)
  			DSSERR("failed to power on device\n");
  	} else {
  		dss_mgr_set_timings(dssdev->manager, &dssdev->panel.timings);
  	}
  }
  
  static void hdmi_dump_regs(struct seq_file *s)
  {
  	mutex_lock(&hdmi.lock);
  
  	if (hdmi_runtime_get())
  		return;
  
  	hdmi.ip_data.ops->dump_wrapper(&hdmi.ip_data, s);
  	hdmi.ip_data.ops->dump_pll(&hdmi.ip_data, s);
  	hdmi.ip_data.ops->dump_phy(&hdmi.ip_data, s);
  	hdmi.ip_data.ops->dump_core(&hdmi.ip_data, s);
  
  	hdmi_runtime_put();
  	mutex_unlock(&hdmi.lock);
  }
  
  int omapdss_hdmi_read_edid(u8 *buf, int len)
  {
  	int r;
  
  	mutex_lock(&hdmi.lock);
  
  	r = hdmi_runtime_get();
  	BUG_ON(r);
  
  	r = hdmi.ip_data.ops->read_edid(&hdmi.ip_data, buf, len);
  
  	hdmi_runtime_put();
  	mutex_unlock(&hdmi.lock);
  
  	return r;
  }
  
  bool omapdss_hdmi_detect(void)
  {
  	int r;
  
  	mutex_lock(&hdmi.lock);
  
  	r = hdmi_runtime_get();
  	BUG_ON(r);
  
  	r = hdmi.ip_data.ops->detect(&hdmi.ip_data);
  
  	hdmi_runtime_put();
  	mutex_unlock(&hdmi.lock);
  
  	return r == 1;
  }
  
  int omapdss_hdmi_display_enable(struct omap_dss_device *dssdev)
  {
  	struct omap_dss_hdmi_data *priv = dssdev->data;
  	int r = 0;
  
  	DSSDBG("ENTER hdmi_display_enable\n");
  
  	mutex_lock(&hdmi.lock);
  
  	if (dssdev->manager == NULL) {
  		DSSERR("failed to enable display: no manager\n");
  		r = -ENODEV;
  		goto err0;
  	}
  
  	hdmi.ip_data.hpd_gpio = priv->hpd_gpio;
  
  	r = omap_dss_start_device(dssdev);
  	if (r) {
  		DSSERR("failed to start device\n");
  		goto err0;
  	}
  
  	if (dssdev->platform_enable) {
  		r = dssdev->platform_enable(dssdev);
  		if (r) {
  			DSSERR("failed to enable GPIO's\n");
  			goto err1;
  		}
  	}
  
  	r = hdmi_power_on(dssdev);
  	if (r) {
  		DSSERR("failed to power on device\n");
  		goto err2;
  	}
  
  	mutex_unlock(&hdmi.lock);
  	return 0;
  
  err2:
  	if (dssdev->platform_disable)
  		dssdev->platform_disable(dssdev);
  err1:
  	omap_dss_stop_device(dssdev);
  err0:
  	mutex_unlock(&hdmi.lock);
  	return r;
  }
  
  void omapdss_hdmi_display_disable(struct omap_dss_device *dssdev)
  {
  	DSSDBG("Enter hdmi_display_disable\n");
  
  	mutex_lock(&hdmi.lock);
  
  	hdmi_power_off(dssdev);
  
  	if (dssdev->platform_disable)
  		dssdev->platform_disable(dssdev);
  
  	omap_dss_stop_device(dssdev);
  
  	mutex_unlock(&hdmi.lock);
  }
  
  static int hdmi_get_clocks(struct platform_device *pdev)
  {
  	struct clk *clk;
  
  	clk = clk_get(&pdev->dev, "sys_clk");
  	if (IS_ERR(clk)) {
  		DSSERR("can't get sys_clk\n");
  		return PTR_ERR(clk);
  	}
  
  	hdmi.sys_clk = clk;
  
  	return 0;
  }
  
  static void hdmi_put_clocks(void)
  {
  	if (hdmi.sys_clk)
  		clk_put(hdmi.sys_clk);
  }
  
  #if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
  int hdmi_compute_acr(u32 sample_freq, u32 *n, u32 *cts)
  {
  	u32 deep_color;
  	bool deep_color_correct = false;
  	u32 pclk = hdmi.ip_data.cfg.timings.pixel_clock;
  
  	if (n == NULL || cts == NULL)
  		return -EINVAL;
  
  	/* TODO: When implemented, query deep color mode here. */
  	deep_color = 100;
  
  	/*
  	 * When using deep color, the default N value (as in the HDMI
  	 * specification) yields to an non-integer CTS. Hence, we
  	 * modify it while keeping the restrictions described in
  	 * section 7.2.1 of the HDMI 1.4a specification.
  	 */
  	switch (sample_freq) {
  	case 32000:
  	case 48000:
  	case 96000:
  	case 192000:
  		if (deep_color == 125)
  			if (pclk == 27027 || pclk == 74250)
  				deep_color_correct = true;
  		if (deep_color == 150)
  			if (pclk == 27027)
  				deep_color_correct = true;
  		break;
  	case 44100:
  	case 88200:
  	case 176400:
  		if (deep_color == 125)
  			if (pclk == 27027)
  				deep_color_correct = true;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	if (deep_color_correct) {
  		switch (sample_freq) {
  		case 32000:
  			*n = 8192;
  			break;
  		case 44100:
  			*n = 12544;
  			break;
  		case 48000:
  			*n = 8192;
  			break;
  		case 88200:
  			*n = 25088;
  			break;
  		case 96000:
  			*n = 16384;
  			break;
  		case 176400:
  			*n = 50176;
  			break;
  		case 192000:
  			*n = 32768;
  			break;
  		default:
  			return -EINVAL;
  		}
  	} else {
  		switch (sample_freq) {
  		case 32000:
  			*n = 4096;
  			break;
  		case 44100:
  			*n = 6272;
  			break;
  		case 48000:
  			*n = 6144;
  			break;
  		case 88200:
  			*n = 12544;
  			break;
  		case 96000:
  			*n = 12288;
  			break;
  		case 176400:
  			*n = 25088;
  			break;
  		case 192000:
  			*n = 24576;
  			break;
  		default:
  			return -EINVAL;
  		}
  	}
  	/* Calculate CTS. See HDMI 1.3a or 1.4a specifications */
  	*cts = pclk * (*n / 128) * deep_color / (sample_freq / 10);
  
  	return 0;
  }
  
  int hdmi_audio_enable(void)
  {
  	DSSDBG("audio_enable\n");
  
  	return hdmi.ip_data.ops->audio_enable(&hdmi.ip_data);
  }
  
  void hdmi_audio_disable(void)
  {
  	DSSDBG("audio_disable\n");
  
  	hdmi.ip_data.ops->audio_disable(&hdmi.ip_data);
  }
  
  int hdmi_audio_start(void)
  {
  	DSSDBG("audio_start\n");
  
  	return hdmi.ip_data.ops->audio_start(&hdmi.ip_data);
  }
  
  void hdmi_audio_stop(void)
  {
  	DSSDBG("audio_stop\n");
  
  	hdmi.ip_data.ops->audio_stop(&hdmi.ip_data);
  }
  
  bool hdmi_mode_has_audio(void)
  {
  	if (hdmi.ip_data.cfg.cm.mode == HDMI_HDMI)
  		return true;
  	else
  		return false;
  }
  
  int hdmi_audio_config(struct omap_dss_audio *audio)
  {
  	return hdmi.ip_data.ops->audio_config(&hdmi.ip_data, audio);
  }
  
  #endif
  
  static void __init hdmi_probe_pdata(struct platform_device *pdev)
  {
  	struct omap_dss_board_info *pdata = pdev->dev.platform_data;
  	int r, i;
  
  	for (i = 0; i < pdata->num_devices; ++i) {
  		struct omap_dss_device *dssdev = pdata->devices[i];
  
  		if (dssdev->type != OMAP_DISPLAY_TYPE_HDMI)
  			continue;
  
  		r = hdmi_init_display(dssdev);
  		if (r) {
  			DSSERR("device %s init failed: %d\n", dssdev->name, r);
  			continue;
  		}
  
  		r = omap_dss_register_device(dssdev, &pdev->dev, i);
  		if (r)
  			DSSERR("device %s register failed: %d\n",
  					dssdev->name, r);
  	}
  }
  
  /* HDMI HW IP initialisation */
  static int __init omapdss_hdmihw_probe(struct platform_device *pdev)
  {
  	struct resource *hdmi_mem;
  	int r;
  
  	hdmi.pdev = pdev;
  
  	mutex_init(&hdmi.lock);
  
  	hdmi_mem = platform_get_resource(hdmi.pdev, IORESOURCE_MEM, 0);
  	if (!hdmi_mem) {
  		DSSERR("can't get IORESOURCE_MEM HDMI\n");
  		return -EINVAL;
  	}
  
  	/* Base address taken from platform */
  	hdmi.ip_data.base_wp = ioremap(hdmi_mem->start,
  						resource_size(hdmi_mem));
  	if (!hdmi.ip_data.base_wp) {
  		DSSERR("can't ioremap WP\n");
  		return -ENOMEM;
  	}
  
  	r = hdmi_get_clocks(pdev);
  	if (r) {
  		iounmap(hdmi.ip_data.base_wp);
  		return r;
  	}
  
  	pm_runtime_enable(&pdev->dev);
  
  	hdmi.ip_data.core_sys_offset = HDMI_CORE_SYS;
  	hdmi.ip_data.core_av_offset = HDMI_CORE_AV;
  	hdmi.ip_data.pll_offset = HDMI_PLLCTRL;
  	hdmi.ip_data.phy_offset = HDMI_PHY;
  	mutex_init(&hdmi.ip_data.lock);
  
  	hdmi_panel_init();
  
  	dss_debugfs_create_file("hdmi", hdmi_dump_regs);
  
  	hdmi_probe_pdata(pdev);
  
  	return 0;
  }
  
  static int __exit omapdss_hdmihw_remove(struct platform_device *pdev)
  {
  	omap_dss_unregister_child_devices(&pdev->dev);
  
  	hdmi_panel_exit();
  
  	pm_runtime_disable(&pdev->dev);
  
  	hdmi_put_clocks();
  
  	iounmap(hdmi.ip_data.base_wp);
  
  	return 0;
  }
  
  static int hdmi_runtime_suspend(struct device *dev)
  {
  	clk_disable_unprepare(hdmi.sys_clk);
  
  	dispc_runtime_put();
  
  	return 0;
  }
  
  static int hdmi_runtime_resume(struct device *dev)
  {
  	int r;
  
  	r = dispc_runtime_get();
  	if (r < 0)
  		return r;
  
  	clk_prepare_enable(hdmi.sys_clk);
  
  	return 0;
  }
  
  static const struct dev_pm_ops hdmi_pm_ops = {
  	.runtime_suspend = hdmi_runtime_suspend,
  	.runtime_resume = hdmi_runtime_resume,
  };
  
  static struct platform_driver omapdss_hdmihw_driver = {
  	.remove         = __exit_p(omapdss_hdmihw_remove),
  	.driver         = {
  		.name   = "omapdss_hdmi",
  		.owner  = THIS_MODULE,
  		.pm	= &hdmi_pm_ops,
  	},
  };
  
  int __init hdmi_init_platform_driver(void)
  {
  	return platform_driver_probe(&omapdss_hdmihw_driver, omapdss_hdmihw_probe);
  }
  
  void __exit hdmi_uninit_platform_driver(void)
  {
  	platform_driver_unregister(&omapdss_hdmihw_driver);
  }
  