include/drm/drm_edid.h - linux - Git at Google

 /*
  * Copyright © 2007-2008 Intel Corporation
  *   Jesse Barnes <jesse.barnes@intel.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  */
 #ifndef __DRM_EDID_H__
 #define __DRM_EDID_H__

 #include <linux/types.h>

 #define EDID_LENGTH 128
 #define DDC_ADDR 0x50
 #define DDC_ADDR2 0x52 /* E-DDC 1.2 - where DisplayID can hide */

 #define CEA_EXT	    0x02
 #define VTB_EXT	    0x10
 #define DI_EXT	    0x40
 #define LS_EXT	    0x50
 #define MI_EXT	    0x60
 #define DISPLAYID_EXT 0x70

 struct est_timings {
 	u8 t1;
 	u8 t2;
 	u8 mfg_rsvd;
 } __attribute__((packed));

 /* 00=16:10, 01=4:3, 10=5:4, 11=16:9 */
 #define EDID_TIMING_ASPECT_SHIFT 6
 #define EDID_TIMING_ASPECT_MASK  (0x3 << EDID_TIMING_ASPECT_SHIFT)

 /* need to add 60 */
 #define EDID_TIMING_VFREQ_SHIFT  0
 #define EDID_TIMING_VFREQ_MASK   (0x3f << EDID_TIMING_VFREQ_SHIFT)

 struct std_timing {
 	u8 hsize; /* need to multiply by 8 then add 248 */
 	u8 vfreq_aspect;
 } __attribute__((packed));

 #define DRM_EDID_PT_HSYNC_POSITIVE (1 << 1)
 #define DRM_EDID_PT_VSYNC_POSITIVE (1 << 2)
 #define DRM_EDID_PT_SEPARATE_SYNC  (3 << 3)
 #define DRM_EDID_PT_STEREO         (1 << 5)
 #define DRM_EDID_PT_INTERLACED     (1 << 7)

 /* If detailed data is pixel timing */
 struct detailed_pixel_timing {
 	u8 hactive_lo;
 	u8 hblank_lo;
 	u8 hactive_hblank_hi;
 	u8 vactive_lo;
 	u8 vblank_lo;
 	u8 vactive_vblank_hi;
 	u8 hsync_offset_lo;
 	u8 hsync_pulse_width_lo;
 	u8 vsync_offset_pulse_width_lo;
 	u8 hsync_vsync_offset_pulse_width_hi;
 	u8 width_mm_lo;
 	u8 height_mm_lo;
 	u8 width_height_mm_hi;
 	u8 hborder;
 	u8 vborder;
 	u8 misc;
 } __attribute__((packed));

 /* If it's not pixel timing, it'll be one of the below */
 struct detailed_data_string {
 	u8 str[13];
 } __attribute__((packed));

 struct detailed_data_monitor_range {
 	u8 min_vfreq;
 	u8 max_vfreq;
 	u8 min_hfreq_khz;
 	u8 max_hfreq_khz;
 	u8 pixel_clock_mhz; /* need to multiply by 10 */
 	u8 flags;
 	union {
 		struct {
 			u8 reserved;
 			u8 hfreq_start_khz; /* need to multiply by 2 */
 			u8 c; /* need to divide by 2 */
 			__le16 m;
 			u8 k;
 			u8 j; /* need to divide by 2 */
 		} __attribute__((packed)) gtf2;
 		struct {
 			u8 version;
 			u8 data1; /* high 6 bits: extra clock resolution */
 			u8 data2; /* plus low 2 of above: max hactive */
 			u8 supported_aspects;
 			u8 flags; /* preferred aspect and blanking support */
 			u8 supported_scalings;
 			u8 preferred_refresh;
 		} __attribute__((packed)) cvt;
 	} formula;
 } __attribute__((packed));

 struct detailed_data_wpindex {
 	u8 white_yx_lo; /* Lower 2 bits each */
 	u8 white_x_hi;
 	u8 white_y_hi;
 	u8 gamma; /* need to divide by 100 then add 1 */
 } __attribute__((packed));

 struct detailed_data_color_point {
 	u8 windex1;
 	u8 wpindex1[3];
 	u8 windex2;
 	u8 wpindex2[3];
 } __attribute__((packed));

 struct cvt_timing {
 	u8 code[3];
 } __attribute__((packed));

 struct detailed_non_pixel {
 	u8 pad1;
 	u8 type; /* ff=serial, fe=string, fd=monitor range, fc=monitor name
 		    fb=color point data, fa=standard timing data,
 		    f9=undefined, f8=mfg. reserved */
 	u8 pad2;
 	union {
 		struct detailed_data_string str;
 		struct detailed_data_monitor_range range;
 		struct detailed_data_wpindex color;
 		struct std_timing timings[6];
 		struct cvt_timing cvt[4];
 	} data;
 } __attribute__((packed));

 #define EDID_DETAIL_EST_TIMINGS 0xf7
 #define EDID_DETAIL_CVT_3BYTE 0xf8
 #define EDID_DETAIL_COLOR_MGMT_DATA 0xf9
 #define EDID_DETAIL_STD_MODES 0xfa
 #define EDID_DETAIL_MONITOR_CPDATA 0xfb
 #define EDID_DETAIL_MONITOR_NAME 0xfc
 #define EDID_DETAIL_MONITOR_RANGE 0xfd
 #define EDID_DETAIL_MONITOR_STRING 0xfe
 #define EDID_DETAIL_MONITOR_SERIAL 0xff

 struct detailed_timing {
 	__le16 pixel_clock; /* need to multiply by 10 KHz */
 	union {
 		struct detailed_pixel_timing pixel_data;
 		struct detailed_non_pixel other_data;
 	} data;
 } __attribute__((packed));

 #define DRM_EDID_INPUT_SERRATION_VSYNC (1 << 0)
 #define DRM_EDID_INPUT_SYNC_ON_GREEN   (1 << 1)
 #define DRM_EDID_INPUT_COMPOSITE_SYNC  (1 << 2)
 #define DRM_EDID_INPUT_SEPARATE_SYNCS  (1 << 3)
 #define DRM_EDID_INPUT_BLANK_TO_BLACK  (1 << 4)
 #define DRM_EDID_INPUT_VIDEO_LEVEL     (3 << 5)
 #define DRM_EDID_INPUT_DIGITAL         (1 << 7)
 #define DRM_EDID_DIGITAL_DEPTH_MASK    (7 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_UNDEF   (0 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_6       (1 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_8       (2 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_10      (3 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_12      (4 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_14      (5 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_16      (6 << 4)
 #define DRM_EDID_DIGITAL_DEPTH_RSVD    (7 << 4)
 #define DRM_EDID_DIGITAL_TYPE_UNDEF    (0)
 #define DRM_EDID_DIGITAL_TYPE_DVI      (1)
 #define DRM_EDID_DIGITAL_TYPE_HDMI_A   (2)
 #define DRM_EDID_DIGITAL_TYPE_HDMI_B   (3)
 #define DRM_EDID_DIGITAL_TYPE_MDDI     (4)
 #define DRM_EDID_DIGITAL_TYPE_DP       (5)

 #define DRM_EDID_FEATURE_DEFAULT_GTF      (1 << 0)
 #define DRM_EDID_FEATURE_PREFERRED_TIMING (1 << 1)
 #define DRM_EDID_FEATURE_STANDARD_COLOR   (1 << 2)
 /* If analog */
 #define DRM_EDID_FEATURE_DISPLAY_TYPE     (3 << 3) /* 00=mono, 01=rgb, 10=non-rgb, 11=unknown */
 /* If digital */
 #define DRM_EDID_FEATURE_COLOR_MASK	  (3 << 3)
 #define DRM_EDID_FEATURE_RGB		  (0 << 3)
 #define DRM_EDID_FEATURE_RGB_YCRCB444	  (1 << 3)
 #define DRM_EDID_FEATURE_RGB_YCRCB422	  (2 << 3)
 #define DRM_EDID_FEATURE_RGB_YCRCB	  (3 << 3) /* both 4:4:4 and 4:2:2 */

 #define DRM_EDID_FEATURE_PM_ACTIVE_OFF    (1 << 5)
 #define DRM_EDID_FEATURE_PM_SUSPEND       (1 << 6)
 #define DRM_EDID_FEATURE_PM_STANDBY       (1 << 7)

 #define DRM_EDID_HDMI_DC_48               (1 << 6)
 #define DRM_EDID_HDMI_DC_36               (1 << 5)
 #define DRM_EDID_HDMI_DC_30               (1 << 4)
 #define DRM_EDID_HDMI_DC_Y444             (1 << 3)

 /* ELD Header Block */
 #define DRM_ELD_HEADER_BLOCK_SIZE	4

 #define DRM_ELD_VER			0
 # define DRM_ELD_VER_SHIFT		3
 # define DRM_ELD_VER_MASK		(0x1f << 3)
 # define DRM_ELD_VER_CEA861D		(2 << 3) /* supports 861D or below */
 # define DRM_ELD_VER_CANNED		(0x1f << 3)

 #define DRM_ELD_BASELINE_ELD_LEN	2	/* in dwords! */

 /* ELD Baseline Block for ELD_Ver == 2 */
 #define DRM_ELD_CEA_EDID_VER_MNL	4
 # define DRM_ELD_CEA_EDID_VER_SHIFT	5
 # define DRM_ELD_CEA_EDID_VER_MASK	(7 << 5)
 # define DRM_ELD_CEA_EDID_VER_NONE	(0 << 5)
 # define DRM_ELD_CEA_EDID_VER_CEA861	(1 << 5)
 # define DRM_ELD_CEA_EDID_VER_CEA861A	(2 << 5)
 # define DRM_ELD_CEA_EDID_VER_CEA861BCD	(3 << 5)
 # define DRM_ELD_MNL_SHIFT		0
 # define DRM_ELD_MNL_MASK		(0x1f << 0)

 #define DRM_ELD_SAD_COUNT_CONN_TYPE	5
 # define DRM_ELD_SAD_COUNT_SHIFT	4
 # define DRM_ELD_SAD_COUNT_MASK		(0xf << 4)
 # define DRM_ELD_CONN_TYPE_SHIFT	2
 # define DRM_ELD_CONN_TYPE_MASK		(3 << 2)
 # define DRM_ELD_CONN_TYPE_HDMI		(0 << 2)
 # define DRM_ELD_CONN_TYPE_DP		(1 << 2)
 # define DRM_ELD_SUPPORTS_AI		(1 << 1)
 # define DRM_ELD_SUPPORTS_HDCP		(1 << 0)

 #define DRM_ELD_AUD_SYNCH_DELAY		6	/* in units of 2 ms */
 # define DRM_ELD_AUD_SYNCH_DELAY_MAX	0xfa	/* 500 ms */

 #define DRM_ELD_SPEAKER			7
 # define DRM_ELD_SPEAKER_RLRC		(1 << 6)
 # define DRM_ELD_SPEAKER_FLRC		(1 << 5)
 # define DRM_ELD_SPEAKER_RC		(1 << 4)
 # define DRM_ELD_SPEAKER_RLR		(1 << 3)
 # define DRM_ELD_SPEAKER_FC		(1 << 2)
 # define DRM_ELD_SPEAKER_LFE		(1 << 1)
 # define DRM_ELD_SPEAKER_FLR		(1 << 0)

 #define DRM_ELD_PORT_ID			8	/* offsets 8..15 inclusive */
 # define DRM_ELD_PORT_ID_LEN		8

 #define DRM_ELD_MANUFACTURER_NAME0	16
 #define DRM_ELD_MANUFACTURER_NAME1	17

 #define DRM_ELD_PRODUCT_CODE0		18
 #define DRM_ELD_PRODUCT_CODE1		19

 #define DRM_ELD_MONITOR_NAME_STRING	20	/* offsets 20..(20+mnl-1) inclusive */

 #define DRM_ELD_CEA_SAD(mnl, sad)	(20 + (mnl) + 3 * (sad))

 struct edid {
 	u8 header[8];
 	/* Vendor & product info */
 	u8 mfg_id[2];
 	u8 prod_code[2];
 	u32 serial; /* FIXME: byte order */
 	u8 mfg_week;
 	u8 mfg_year;
 	/* EDID version */
 	u8 version;
 	u8 revision;
 	/* Display info: */
 	u8 input;
 	u8 width_cm;
 	u8 height_cm;
 	u8 gamma;
 	u8 features;
 	/* Color characteristics */
 	u8 red_green_lo;
 	u8 black_white_lo;
 	u8 red_x;
 	u8 red_y;
 	u8 green_x;
 	u8 green_y;
 	u8 blue_x;
 	u8 blue_y;
 	u8 white_x;
 	u8 white_y;
 	/* Est. timings and mfg rsvd timings*/
 	struct est_timings established_timings;
 	/* Standard timings 1-8*/
 	struct std_timing standard_timings[8];
 	/* Detailing timings 1-4 */
 	struct detailed_timing detailed_timings[4];
 	/* Number of 128 byte ext. blocks */
 	u8 extensions;
 	/* Checksum */
 	u8 checksum;
 } __attribute__((packed));

 #define EDID_PRODUCT_ID(e) ((e)->prod_code[0] | ((e)->prod_code[1] << 8))

 /* Short Audio Descriptor */
 struct cea_sad {
 	u8 format;
 	u8 channels; /* max number of channels - 1 */
 	u8 freq;
 	u8 byte2; /* meaning depends on format */
 };

 struct drm_encoder;
 struct drm_connector;
 struct drm_display_mode;
 struct hdmi_avi_infoframe;
 struct hdmi_vendor_infoframe;

 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
 int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads);
 int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb);
 int drm_av_sync_delay(struct drm_connector *connector,
 		      const struct drm_display_mode *mode);
 struct drm_connector *drm_select_eld(struct drm_encoder *encoder);

 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 int drm_load_edid_firmware(struct drm_connector *connector);
 #else
 static inline int drm_load_edid_firmware(struct drm_connector *connector)
 {
 	return 0;
 }
 #endif

 int
 drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
 					 const struct drm_display_mode *mode);
 int
 drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
 					    const struct drm_display_mode *mode);

 /**
  * drm_eld_mnl - Get ELD monitor name length in bytes.
  * @eld: pointer to an eld memory structure with mnl set
  */
 static inline int drm_eld_mnl(const uint8_t *eld)
 {
 	return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
 }

 /**
  * drm_eld_sad - Get ELD SAD structures.
  * @eld: pointer to an eld memory structure with sad_count set
  */
 static inline const uint8_t *drm_eld_sad(const uint8_t *eld)
 {
 	unsigned int ver, mnl;

 	ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
 	if (ver != 2 && ver != 31)
 		return NULL;

 	mnl = drm_eld_mnl(eld);
 	if (mnl > 16)
 		return NULL;

 	return eld + DRM_ELD_CEA_SAD(mnl, 0);
 }

 /**
  * drm_eld_sad_count - Get ELD SAD count.
  * @eld: pointer to an eld memory structure with sad_count set
  */
 static inline int drm_eld_sad_count(const uint8_t *eld)
 {
 	return (eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_SAD_COUNT_MASK) >>
 		DRM_ELD_SAD_COUNT_SHIFT;
 }

 /**
  * drm_eld_calc_baseline_block_size - Calculate baseline block size in bytes
  * @eld: pointer to an eld memory structure with mnl and sad_count set
  *
  * This is a helper for determining the payload size of the baseline block, in
  * bytes, for e.g. setting the Baseline_ELD_Len field in the ELD header block.
  */
 static inline int drm_eld_calc_baseline_block_size(const uint8_t *eld)
 {
 	return DRM_ELD_MONITOR_NAME_STRING - DRM_ELD_HEADER_BLOCK_SIZE +
 		drm_eld_mnl(eld) + drm_eld_sad_count(eld) * 3;
 }

 /**
  * drm_eld_size - Get ELD size in bytes
  * @eld: pointer to a complete eld memory structure
  *
  * The returned value does not include the vendor block. It's vendor specific,
  * and comprises of the remaining bytes in the ELD memory buffer after
  * drm_eld_size() bytes of header and baseline block.
  *
  * The returned value is guaranteed to be a multiple of 4.
  */
 static inline int drm_eld_size(const uint8_t *eld)
 {
 	return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4;
 }

 /**
  * drm_eld_get_conn_type - Get device type hdmi/dp connected
  * @eld: pointer to an ELD memory structure
  *
  * The caller need to use %DRM_ELD_CONN_TYPE_HDMI or %DRM_ELD_CONN_TYPE_DP to
  * identify the display type connected.
  */
 static inline u8 drm_eld_get_conn_type(const uint8_t *eld)
 {
 	return eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_CONN_TYPE_MASK;
 }

 struct edid *drm_do_get_edid(struct drm_connector *connector,
 	int (*get_edid_block)(void *data, u8 *buf, unsigned int block,
 			      size_t len),
 	void *data);

 #endif /* __DRM_EDID_H__ */
	/*
	* Copyright © 2007-2008 Intel Corporation
	* Jesse Barnes <jesse.barnes@intel.com>
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*/
	#ifndef __DRM_EDID_H__
	#define __DRM_EDID_H__

	#include <linux/types.h>

	#define EDID_LENGTH 128
	#define DDC_ADDR 0x50
	#define DDC_ADDR2 0x52 /* E-DDC 1.2 - where DisplayID can hide */

	#define CEA_EXT 0x02
	#define VTB_EXT 0x10
	#define DI_EXT 0x40
	#define LS_EXT 0x50
	#define MI_EXT 0x60
	#define DISPLAYID_EXT 0x70

	struct est_timings {
	u8 t1;
	u8 t2;
	u8 mfg_rsvd;
	} __attribute__((packed));

	/* 00=16:10, 01=4:3, 10=5:4, 11=16:9 */
	#define EDID_TIMING_ASPECT_SHIFT 6
	#define EDID_TIMING_ASPECT_MASK (0x3 << EDID_TIMING_ASPECT_SHIFT)

	/* need to add 60 */
	#define EDID_TIMING_VFREQ_SHIFT 0
	#define EDID_TIMING_VFREQ_MASK (0x3f << EDID_TIMING_VFREQ_SHIFT)

	struct std_timing {
	u8 hsize; /* need to multiply by 8 then add 248 */
	u8 vfreq_aspect;
	} __attribute__((packed));

	#define DRM_EDID_PT_HSYNC_POSITIVE (1 << 1)
	#define DRM_EDID_PT_VSYNC_POSITIVE (1 << 2)
	#define DRM_EDID_PT_SEPARATE_SYNC (3 << 3)
	#define DRM_EDID_PT_STEREO (1 << 5)
	#define DRM_EDID_PT_INTERLACED (1 << 7)

	/* If detailed data is pixel timing */
	struct detailed_pixel_timing {
	u8 hactive_lo;
	u8 hblank_lo;
	u8 hactive_hblank_hi;
	u8 vactive_lo;
	u8 vblank_lo;
	u8 vactive_vblank_hi;
	u8 hsync_offset_lo;
	u8 hsync_pulse_width_lo;
	u8 vsync_offset_pulse_width_lo;
	u8 hsync_vsync_offset_pulse_width_hi;
	u8 width_mm_lo;
	u8 height_mm_lo;
	u8 width_height_mm_hi;
	u8 hborder;
	u8 vborder;
	u8 misc;
	} __attribute__((packed));

	/* If it's not pixel timing, it'll be one of the below */
	struct detailed_data_string {
	u8 str[13];
	} __attribute__((packed));

	struct detailed_data_monitor_range {
	u8 min_vfreq;
	u8 max_vfreq;
	u8 min_hfreq_khz;
	u8 max_hfreq_khz;
	u8 pixel_clock_mhz; /* need to multiply by 10 */
	u8 flags;
	union {
	struct {
	u8 reserved;
	u8 hfreq_start_khz; /* need to multiply by 2 */
	u8 c; /* need to divide by 2 */
	__le16 m;
	u8 k;
	u8 j; /* need to divide by 2 */
	} __attribute__((packed)) gtf2;
	struct {
	u8 version;
	u8 data1; /* high 6 bits: extra clock resolution */
	u8 data2; /* plus low 2 of above: max hactive */
	u8 supported_aspects;
	u8 flags; /* preferred aspect and blanking support */
	u8 supported_scalings;
	u8 preferred_refresh;
	} __attribute__((packed)) cvt;
	} formula;
	} __attribute__((packed));

	struct detailed_data_wpindex {
	u8 white_yx_lo; /* Lower 2 bits each */
	u8 white_x_hi;
	u8 white_y_hi;
	u8 gamma; /* need to divide by 100 then add 1 */
	} __attribute__((packed));

	struct detailed_data_color_point {
	u8 windex1;
	u8 wpindex1[3];
	u8 windex2;
	u8 wpindex2[3];
	} __attribute__((packed));

	struct cvt_timing {
	u8 code[3];
	} __attribute__((packed));

	struct detailed_non_pixel {
	u8 pad1;
	u8 type; /* ff=serial, fe=string, fd=monitor range, fc=monitor name
	fb=color point data, fa=standard timing data,
	f9=undefined, f8=mfg. reserved */
	u8 pad2;
	union {
	struct detailed_data_string str;
	struct detailed_data_monitor_range range;
	struct detailed_data_wpindex color;
	struct std_timing timings[6];
	struct cvt_timing cvt[4];
	} data;
	} __attribute__((packed));

	#define EDID_DETAIL_EST_TIMINGS 0xf7
	#define EDID_DETAIL_CVT_3BYTE 0xf8
	#define EDID_DETAIL_COLOR_MGMT_DATA 0xf9
	#define EDID_DETAIL_STD_MODES 0xfa
	#define EDID_DETAIL_MONITOR_CPDATA 0xfb
	#define EDID_DETAIL_MONITOR_NAME 0xfc
	#define EDID_DETAIL_MONITOR_RANGE 0xfd
	#define EDID_DETAIL_MONITOR_STRING 0xfe
	#define EDID_DETAIL_MONITOR_SERIAL 0xff

	struct detailed_timing {
	__le16 pixel_clock; /* need to multiply by 10 KHz */
	union {
	struct detailed_pixel_timing pixel_data;
	struct detailed_non_pixel other_data;
	} data;
	} __attribute__((packed));

	#define DRM_EDID_INPUT_SERRATION_VSYNC (1 << 0)
	#define DRM_EDID_INPUT_SYNC_ON_GREEN (1 << 1)
	#define DRM_EDID_INPUT_COMPOSITE_SYNC (1 << 2)
	#define DRM_EDID_INPUT_SEPARATE_SYNCS (1 << 3)
	#define DRM_EDID_INPUT_BLANK_TO_BLACK (1 << 4)
	#define DRM_EDID_INPUT_VIDEO_LEVEL (3 << 5)
	#define DRM_EDID_INPUT_DIGITAL (1 << 7)
	#define DRM_EDID_DIGITAL_DEPTH_MASK (7 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_UNDEF (0 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_6 (1 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_8 (2 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_10 (3 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_12 (4 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_14 (5 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_16 (6 << 4)
	#define DRM_EDID_DIGITAL_DEPTH_RSVD (7 << 4)
	#define DRM_EDID_DIGITAL_TYPE_UNDEF (0)
	#define DRM_EDID_DIGITAL_TYPE_DVI (1)
	#define DRM_EDID_DIGITAL_TYPE_HDMI_A (2)
	#define DRM_EDID_DIGITAL_TYPE_HDMI_B (3)
	#define DRM_EDID_DIGITAL_TYPE_MDDI (4)
	#define DRM_EDID_DIGITAL_TYPE_DP (5)

	#define DRM_EDID_FEATURE_DEFAULT_GTF (1 << 0)
	#define DRM_EDID_FEATURE_PREFERRED_TIMING (1 << 1)
	#define DRM_EDID_FEATURE_STANDARD_COLOR (1 << 2)
	/* If analog */
	#define DRM_EDID_FEATURE_DISPLAY_TYPE (3 << 3) /* 00=mono, 01=rgb, 10=non-rgb, 11=unknown */
	/* If digital */
	#define DRM_EDID_FEATURE_COLOR_MASK (3 << 3)
	#define DRM_EDID_FEATURE_RGB (0 << 3)
	#define DRM_EDID_FEATURE_RGB_YCRCB444 (1 << 3)
	#define DRM_EDID_FEATURE_RGB_YCRCB422 (2 << 3)
	#define DRM_EDID_FEATURE_RGB_YCRCB (3 << 3) /* both 4:4:4 and 4:2:2 */

	#define DRM_EDID_FEATURE_PM_ACTIVE_OFF (1 << 5)
	#define DRM_EDID_FEATURE_PM_SUSPEND (1 << 6)
	#define DRM_EDID_FEATURE_PM_STANDBY (1 << 7)

	#define DRM_EDID_HDMI_DC_48 (1 << 6)
	#define DRM_EDID_HDMI_DC_36 (1 << 5)
	#define DRM_EDID_HDMI_DC_30 (1 << 4)
	#define DRM_EDID_HDMI_DC_Y444 (1 << 3)

	/* ELD Header Block */
	#define DRM_ELD_HEADER_BLOCK_SIZE 4

	#define DRM_ELD_VER 0
	# define DRM_ELD_VER_SHIFT 3
	# define DRM_ELD_VER_MASK (0x1f << 3)
	# define DRM_ELD_VER_CEA861D (2 << 3) /* supports 861D or below */
	# define DRM_ELD_VER_CANNED (0x1f << 3)

	#define DRM_ELD_BASELINE_ELD_LEN 2 /* in dwords! */

	/* ELD Baseline Block for ELD_Ver == 2 */
	#define DRM_ELD_CEA_EDID_VER_MNL 4
	# define DRM_ELD_CEA_EDID_VER_SHIFT 5
	# define DRM_ELD_CEA_EDID_VER_MASK (7 << 5)
	# define DRM_ELD_CEA_EDID_VER_NONE (0 << 5)
	# define DRM_ELD_CEA_EDID_VER_CEA861 (1 << 5)
	# define DRM_ELD_CEA_EDID_VER_CEA861A (2 << 5)
	# define DRM_ELD_CEA_EDID_VER_CEA861BCD (3 << 5)
	# define DRM_ELD_MNL_SHIFT 0
	# define DRM_ELD_MNL_MASK (0x1f << 0)

	#define DRM_ELD_SAD_COUNT_CONN_TYPE 5
	# define DRM_ELD_SAD_COUNT_SHIFT 4
	# define DRM_ELD_SAD_COUNT_MASK (0xf << 4)
	# define DRM_ELD_CONN_TYPE_SHIFT 2
	# define DRM_ELD_CONN_TYPE_MASK (3 << 2)
	# define DRM_ELD_CONN_TYPE_HDMI (0 << 2)
	# define DRM_ELD_CONN_TYPE_DP (1 << 2)
	# define DRM_ELD_SUPPORTS_AI (1 << 1)
	# define DRM_ELD_SUPPORTS_HDCP (1 << 0)

	#define DRM_ELD_AUD_SYNCH_DELAY 6 /* in units of 2 ms */
	# define DRM_ELD_AUD_SYNCH_DELAY_MAX 0xfa /* 500 ms */

	#define DRM_ELD_SPEAKER 7
	# define DRM_ELD_SPEAKER_RLRC (1 << 6)
	# define DRM_ELD_SPEAKER_FLRC (1 << 5)
	# define DRM_ELD_SPEAKER_RC (1 << 4)
	# define DRM_ELD_SPEAKER_RLR (1 << 3)
	# define DRM_ELD_SPEAKER_FC (1 << 2)
	# define DRM_ELD_SPEAKER_LFE (1 << 1)
	# define DRM_ELD_SPEAKER_FLR (1 << 0)

	#define DRM_ELD_PORT_ID 8 /* offsets 8..15 inclusive */
	# define DRM_ELD_PORT_ID_LEN 8

	#define DRM_ELD_MANUFACTURER_NAME0 16
	#define DRM_ELD_MANUFACTURER_NAME1 17

	#define DRM_ELD_PRODUCT_CODE0 18
	#define DRM_ELD_PRODUCT_CODE1 19

	#define DRM_ELD_MONITOR_NAME_STRING 20 /* offsets 20..(20+mnl-1) inclusive */

	#define DRM_ELD_CEA_SAD(mnl, sad) (20 + (mnl) + 3 * (sad))

	struct edid {
	u8 header[8];
	/* Vendor & product info */
	u8 mfg_id[2];
	u8 prod_code[2];
	u32 serial; /* FIXME: byte order */
	u8 mfg_week;
	u8 mfg_year;
	/* EDID version */
	u8 version;
	u8 revision;
	/* Display info: */
	u8 input;
	u8 width_cm;
	u8 height_cm;
	u8 gamma;
	u8 features;
	/* Color characteristics */
	u8 red_green_lo;
	u8 black_white_lo;
	u8 red_x;
	u8 red_y;
	u8 green_x;
	u8 green_y;
	u8 blue_x;
	u8 blue_y;
	u8 white_x;
	u8 white_y;
	/* Est. timings and mfg rsvd timings*/
	struct est_timings established_timings;
	/* Standard timings 1-8*/
	struct std_timing standard_timings[8];
	/* Detailing timings 1-4 */
	struct detailed_timing detailed_timings[4];
	/* Number of 128 byte ext. blocks */
	u8 extensions;
	/* Checksum */
	u8 checksum;
	} __attribute__((packed));

	#define EDID_PRODUCT_ID(e) ((e)->prod_code[0] \| ((e)->prod_code[1] << 8))

	/* Short Audio Descriptor */
	struct cea_sad {
	u8 format;
	u8 channels; /* max number of channels - 1 */
	u8 freq;
	u8 byte2; /* meaning depends on format */
	};

	struct drm_encoder;
	struct drm_connector;
	struct drm_display_mode;
	struct hdmi_avi_infoframe;
	struct hdmi_vendor_infoframe;

	void drm_edid_to_eld(struct drm_connector connector, struct edid edid);
	int drm_edid_to_sad(struct edid edid, struct cea_sad *sads);
	int drm_edid_to_speaker_allocation(struct edid edid, u8 *sadb);
	int drm_av_sync_delay(struct drm_connector *connector,
	const struct drm_display_mode *mode);
	struct drm_connector drm_select_eld(struct drm_encoder encoder);

	#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
	int drm_load_edid_firmware(struct drm_connector *connector);
	#else
	static inline int drm_load_edid_firmware(struct drm_connector *connector)
	{
	return 0;
	}
	#endif

	int
	drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
	const struct drm_display_mode *mode);
	int
	drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
	const struct drm_display_mode *mode);

	/**
	* drm_eld_mnl - Get ELD monitor name length in bytes.
	* @eld: pointer to an eld memory structure with mnl set
	*/
	static inline int drm_eld_mnl(const uint8_t *eld)
	{
	return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
	}

	/**
	* drm_eld_sad - Get ELD SAD structures.
	* @eld: pointer to an eld memory structure with sad_count set
	*/
	static inline const uint8_t drm_eld_sad(const uint8_t eld)
	{
	unsigned int ver, mnl;

	ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
	if (ver != 2 && ver != 31)
	return NULL;

	mnl = drm_eld_mnl(eld);
	if (mnl > 16)
	return NULL;

	return eld + DRM_ELD_CEA_SAD(mnl, 0);
	}

	/**
	* drm_eld_sad_count - Get ELD SAD count.
	* @eld: pointer to an eld memory structure with sad_count set
	*/
	static inline int drm_eld_sad_count(const uint8_t *eld)
	{
	return (eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_SAD_COUNT_MASK) >>
	DRM_ELD_SAD_COUNT_SHIFT;
	}

	/**
	* drm_eld_calc_baseline_block_size - Calculate baseline block size in bytes
	* @eld: pointer to an eld memory structure with mnl and sad_count set
	*
	* This is a helper for determining the payload size of the baseline block, in
	* bytes, for e.g. setting the Baseline_ELD_Len field in the ELD header block.
	*/
	static inline int drm_eld_calc_baseline_block_size(const uint8_t *eld)
	{
	return DRM_ELD_MONITOR_NAME_STRING - DRM_ELD_HEADER_BLOCK_SIZE +
	drm_eld_mnl(eld) + drm_eld_sad_count(eld) * 3;
	}

	/**
	* drm_eld_size - Get ELD size in bytes
	* @eld: pointer to a complete eld memory structure
	*
	* The returned value does not include the vendor block. It's vendor specific,
	* and comprises of the remaining bytes in the ELD memory buffer after
	* drm_eld_size() bytes of header and baseline block.
	*
	* The returned value is guaranteed to be a multiple of 4.
	*/
	static inline int drm_eld_size(const uint8_t *eld)
	{
	return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4;
	}

	/**
	* drm_eld_get_conn_type - Get device type hdmi/dp connected
	* @eld: pointer to an ELD memory structure
	*
	* The caller need to use %DRM_ELD_CONN_TYPE_HDMI or %DRM_ELD_CONN_TYPE_DP to
	* identify the display type connected.
	*/
	static inline u8 drm_eld_get_conn_type(const uint8_t *eld)
	{
	return eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_CONN_TYPE_MASK;
	}

	struct edid drm_do_get_edid(struct drm_connector connector,
	int (get_edid_block)(void data, u8 *buf, unsigned int block,
	size_t len),
	void *data);

	#endif /* __DRM_EDID_H__ */