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>

 enum hdmi_quantization_range;
 struct drm_connector;
 struct drm_device;
 struct drm_display_mode;
 struct drm_edid;
 struct drm_printer;
 struct hdmi_avi_infoframe;
 struct hdmi_vendor_infoframe;
 struct i2c_adapter;

 #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;
 } __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;
 } __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;
 } __packed;

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

 #define DRM_EDID_RANGE_OFFSET_MIN_VFREQ (1 << 0) /* 1.4 */
 #define DRM_EDID_RANGE_OFFSET_MAX_VFREQ (1 << 1) /* 1.4 */
 #define DRM_EDID_RANGE_OFFSET_MIN_HFREQ (1 << 2) /* 1.4 */
 #define DRM_EDID_RANGE_OFFSET_MAX_HFREQ (1 << 3) /* 1.4 */

 #define DRM_EDID_DEFAULT_GTF_SUPPORT_FLAG   0x00 /* 1.3 */
 #define DRM_EDID_RANGE_LIMITS_ONLY_FLAG     0x01 /* 1.4 */
 #define DRM_EDID_SECONDARY_GTF_SUPPORT_FLAG 0x02 /* 1.3 */
 #define DRM_EDID_CVT_SUPPORT_FLAG           0x04 /* 1.4 */

 #define DRM_EDID_CVT_FLAGS_STANDARD_BLANKING (1 << 3)
 #define DRM_EDID_CVT_FLAGS_REDUCED_BLANKING  (1 << 4)

 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 */
 		} __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;
 		} __packed cvt;
 	} __packed formula;
 } __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 */
 } __packed;

 struct detailed_data_color_point {
 	u8 windex1;
 	u8 wpindex1[3];
 	u8 windex2;
 	u8 wpindex2[3];
 } __packed;

 struct cvt_timing {
 	u8 code[3];
 } __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];
 	} __packed data;
 } __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;
 	} __packed data;
 } __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) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_UNDEF   (0 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_6       (1 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_8       (2 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_10      (3 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_12      (4 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_14      (5 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_16      (6 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_DEPTH_RSVD    (7 << 4) /* 1.4 */
 #define DRM_EDID_DIGITAL_TYPE_MASK     (7 << 0) /* 1.4 */
 #define DRM_EDID_DIGITAL_TYPE_UNDEF    (0 << 0) /* 1.4 */
 #define DRM_EDID_DIGITAL_TYPE_DVI      (1 << 0) /* 1.4 */
 #define DRM_EDID_DIGITAL_TYPE_HDMI_A   (2 << 0) /* 1.4 */
 #define DRM_EDID_DIGITAL_TYPE_HDMI_B   (3 << 0) /* 1.4 */
 #define DRM_EDID_DIGITAL_TYPE_MDDI     (4 << 0) /* 1.4 */
 #define DRM_EDID_DIGITAL_TYPE_DP       (5 << 0) /* 1.4 */
 #define DRM_EDID_DIGITAL_DFP_1_X       (1 << 0) /* 1.3 */

 #define DRM_EDID_FEATURE_DEFAULT_GTF      (1 << 0) /* 1.2 */
 #define DRM_EDID_FEATURE_CONTINUOUS_FREQ  (1 << 0) /* 1.4 */
 #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)

 /* YCBCR 420 deep color modes */
 #define DRM_EDID_YCBCR420_DC_48		  (1 << 2)
 #define DRM_EDID_YCBCR420_DC_36		  (1 << 1)
 #define DRM_EDID_YCBCR420_DC_30		  (1 << 0)
 #define DRM_EDID_YCBCR420_DC_MASK (DRM_EDID_YCBCR420_DC_48 | \
 				    DRM_EDID_YCBCR420_DC_36 | \
 				    DRM_EDID_YCBCR420_DC_30)

 /* HDMI 2.1 additional fields */
 #define DRM_EDID_MAX_FRL_RATE_MASK		0xf0
 #define DRM_EDID_FAPA_START_LOCATION		(1 << 0)
 #define DRM_EDID_ALLM				(1 << 1)
 #define DRM_EDID_FVA				(1 << 2)

 /* Deep Color specific */
 #define DRM_EDID_DC_30BIT_420			(1 << 0)
 #define DRM_EDID_DC_36BIT_420			(1 << 1)
 #define DRM_EDID_DC_48BIT_420			(1 << 2)

 /* VRR specific */
 #define DRM_EDID_CNMVRR				(1 << 3)
 #define DRM_EDID_CINEMA_VRR			(1 << 4)
 #define DRM_EDID_MDELTA				(1 << 5)
 #define DRM_EDID_VRR_MAX_UPPER_MASK		0xc0
 #define DRM_EDID_VRR_MAX_LOWER_MASK		0xff
 #define DRM_EDID_VRR_MIN_MASK			0x3f

 /* DSC specific */
 #define DRM_EDID_DSC_10BPC			(1 << 0)
 #define DRM_EDID_DSC_12BPC			(1 << 1)
 #define DRM_EDID_DSC_16BPC			(1 << 2)
 #define DRM_EDID_DSC_ALL_BPP			(1 << 3)
 #define DRM_EDID_DSC_NATIVE_420			(1 << 6)
 #define DRM_EDID_DSC_1P2			(1 << 7)
 #define DRM_EDID_DSC_MAX_FRL_RATE_MASK		0xf0
 #define DRM_EDID_DSC_MAX_SLICES			0xf
 #define DRM_EDID_DSC_TOTAL_CHUNK_KBYTES		0x3f

 struct drm_edid_product_id {
 	__be16 manufacturer_name;
 	__le16 product_code;
 	__le32 serial_number;
 	u8 week_of_manufacture;
 	u8 year_of_manufacture;
 } __packed;

 struct edid {
 	u8 header[8];
 	/* Vendor & product info */
 	union {
 		struct drm_edid_product_id product_id;
 		struct {
 			u8 mfg_id[2];
 			u8 prod_code[2];
 			u32 serial; /* FIXME: byte order */
 			u8 mfg_week;
 			u8 mfg_year;
 		} __packed;
 	} __packed;
 	/* 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 blue_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;
 } __packed;

 /* EDID matching */
 struct drm_edid_ident {
 	/* ID encoded by drm_edid_encode_panel_id() */
 	u32 panel_id;
 	const char *name;
 };

 #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 */
 };

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

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

 void
 drm_hdmi_avi_infoframe_quant_range(struct hdmi_avi_infoframe *frame,
 				   const struct drm_connector *connector,
 				   const struct drm_display_mode *mode,
 				   enum hdmi_quantization_range rgb_quant_range);

 /**
  * drm_edid_decode_mfg_id - Decode the manufacturer ID
  * @mfg_id: The manufacturer ID
  * @vend: A 4-byte buffer to store the 3-letter vendor string plus a '\0'
  *	  termination
  */
 static inline const char *drm_edid_decode_mfg_id(u16 mfg_id, char vend[4])
 {
 	vend[0] = '@' + ((mfg_id >> 10) & 0x1f);
 	vend[1] = '@' + ((mfg_id >> 5) & 0x1f);
 	vend[2] = '@' + ((mfg_id >> 0) & 0x1f);
 	vend[3] = '\0';

 	return vend;
 }

 /**
  * drm_edid_encode_panel_id - Encode an ID for matching against drm_edid_get_panel_id()
  * @vend_chr_0: First character of the vendor string.
  * @vend_chr_1: Second character of the vendor string.
  * @vend_chr_2: Third character of the vendor string.
  * @product_id: The 16-bit product ID.
  *
  * This is a macro so that it can be calculated at compile time and used
  * as an initializer.
  *
  * For instance:
  *   drm_edid_encode_panel_id('B', 'O', 'E', 0x2d08) => 0x09e52d08
  *
  * Return: a 32-bit ID per panel.
  */
 #define drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, vend_chr_2, product_id) \
 	((((u32)(vend_chr_0) - '@') & 0x1f) << 26 | \
 	 (((u32)(vend_chr_1) - '@') & 0x1f) << 21 | \
 	 (((u32)(vend_chr_2) - '@') & 0x1f) << 16 | \
 	 ((product_id) & 0xffff))

 /**
  * drm_edid_decode_panel_id - Decode a panel ID from drm_edid_encode_panel_id()
  * @panel_id: The panel ID to decode.
  * @vend: A 4-byte buffer to store the 3-letter vendor string plus a '\0'
  *	  termination
  * @product_id: The product ID will be returned here.
  *
  * For instance, after:
  *   drm_edid_decode_panel_id(0x09e52d08, vend, &product_id)
  * These will be true:
  *   vend[0] = 'B'
  *   vend[1] = 'O'
  *   vend[2] = 'E'
  *   vend[3] = '\0'
  *   product_id = 0x2d08
  */
 static inline void drm_edid_decode_panel_id(u32 panel_id, char vend[4], u16 *product_id)
 {
 	*product_id = (u16)(panel_id & 0xffff);
 	drm_edid_decode_mfg_id(panel_id >> 16, vend);
 }

 bool drm_probe_ddc(struct i2c_adapter *adapter);
 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);
 struct edid *drm_get_edid(struct drm_connector *connector,
 			  struct i2c_adapter *adapter);
 struct edid *drm_get_edid_switcheroo(struct drm_connector *connector,
 				     struct i2c_adapter *adapter);
 struct edid *drm_edid_duplicate(const struct edid *edid);
 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
 int drm_edid_override_connector_update(struct drm_connector *connector);

 u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
 bool drm_detect_hdmi_monitor(const struct edid *edid);
 bool drm_detect_monitor_audio(const struct edid *edid);
 enum hdmi_quantization_range
 drm_default_rgb_quant_range(const struct drm_display_mode *mode);
 int drm_add_modes_noedid(struct drm_connector *connector,
 			 int hdisplay, int vdisplay);

 int drm_edid_header_is_valid(const void *edid);
 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
 			  bool *edid_corrupt);
 bool drm_edid_is_valid(struct edid *edid);
 void drm_edid_get_monitor_name(const struct edid *edid, char *name,
 			       int buflen);
 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
 					   int hsize, int vsize, int fresh,
 					   bool rb);
 struct drm_display_mode *
 drm_display_mode_from_cea_vic(struct drm_device *dev,
 			      u8 video_code);

 /* Interface based on struct drm_edid */
 const struct drm_edid *drm_edid_alloc(const void *edid, size_t size);
 const struct drm_edid *drm_edid_dup(const struct drm_edid *drm_edid);
 void drm_edid_free(const struct drm_edid *drm_edid);
 bool drm_edid_valid(const struct drm_edid *drm_edid);
 const struct edid *drm_edid_raw(const struct drm_edid *drm_edid);
 const struct drm_edid *drm_edid_read(struct drm_connector *connector);
 const struct drm_edid *drm_edid_read_ddc(struct drm_connector *connector,
 					 struct i2c_adapter *adapter);
 const struct drm_edid *drm_edid_read_custom(struct drm_connector *connector,
 					    int (*read_block)(void *context, u8 *buf, unsigned int block, size_t len),
 					    void *context);
 const struct drm_edid *drm_edid_read_base_block(struct i2c_adapter *adapter);
 const struct drm_edid *drm_edid_read_switcheroo(struct drm_connector *connector,
 						struct i2c_adapter *adapter);
 int drm_edid_connector_update(struct drm_connector *connector,
 			      const struct drm_edid *edid);
 int drm_edid_connector_add_modes(struct drm_connector *connector);
 bool drm_edid_is_digital(const struct drm_edid *drm_edid);
 void drm_edid_get_product_id(const struct drm_edid *drm_edid,
 			     struct drm_edid_product_id *id);
 void drm_edid_print_product_id(struct drm_printer *p,
 			       const struct drm_edid_product_id *id, bool raw);
 u32 drm_edid_get_panel_id(const struct drm_edid *drm_edid);
 bool drm_edid_match(const struct drm_edid *drm_edid,
 		    const struct drm_edid_ident *ident);

 #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>

	enum hdmi_quantization_range;
	struct drm_connector;
	struct drm_device;
	struct drm_display_mode;
	struct drm_edid;
	struct drm_printer;
	struct hdmi_avi_infoframe;
	struct hdmi_vendor_infoframe;
	struct i2c_adapter;

	#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;
	} __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;
	} __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;
	} __packed;

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

	#define DRM_EDID_RANGE_OFFSET_MIN_VFREQ (1 << 0) /* 1.4 */
	#define DRM_EDID_RANGE_OFFSET_MAX_VFREQ (1 << 1) /* 1.4 */
	#define DRM_EDID_RANGE_OFFSET_MIN_HFREQ (1 << 2) /* 1.4 */
	#define DRM_EDID_RANGE_OFFSET_MAX_HFREQ (1 << 3) /* 1.4 */

	#define DRM_EDID_DEFAULT_GTF_SUPPORT_FLAG 0x00 /* 1.3 */
	#define DRM_EDID_RANGE_LIMITS_ONLY_FLAG 0x01 /* 1.4 */
	#define DRM_EDID_SECONDARY_GTF_SUPPORT_FLAG 0x02 /* 1.3 */
	#define DRM_EDID_CVT_SUPPORT_FLAG 0x04 /* 1.4 */

	#define DRM_EDID_CVT_FLAGS_STANDARD_BLANKING (1 << 3)
	#define DRM_EDID_CVT_FLAGS_REDUCED_BLANKING (1 << 4)

	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 */
	} __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;
	} __packed cvt;
	} __packed formula;
	} __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 */
	} __packed;

	struct detailed_data_color_point {
	u8 windex1;
	u8 wpindex1[3];
	u8 windex2;
	u8 wpindex2[3];
	} __packed;

	struct cvt_timing {
	u8 code[3];
	} __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];
	} __packed data;
	} __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;
	} __packed data;
	} __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) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_UNDEF (0 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_6 (1 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_8 (2 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_10 (3 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_12 (4 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_14 (5 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_16 (6 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_DEPTH_RSVD (7 << 4) /* 1.4 */
	#define DRM_EDID_DIGITAL_TYPE_MASK (7 << 0) /* 1.4 */
	#define DRM_EDID_DIGITAL_TYPE_UNDEF (0 << 0) /* 1.4 */
	#define DRM_EDID_DIGITAL_TYPE_DVI (1 << 0) /* 1.4 */
	#define DRM_EDID_DIGITAL_TYPE_HDMI_A (2 << 0) /* 1.4 */
	#define DRM_EDID_DIGITAL_TYPE_HDMI_B (3 << 0) /* 1.4 */
	#define DRM_EDID_DIGITAL_TYPE_MDDI (4 << 0) /* 1.4 */
	#define DRM_EDID_DIGITAL_TYPE_DP (5 << 0) /* 1.4 */
	#define DRM_EDID_DIGITAL_DFP_1_X (1 << 0) /* 1.3 */

	#define DRM_EDID_FEATURE_DEFAULT_GTF (1 << 0) /* 1.2 */
	#define DRM_EDID_FEATURE_CONTINUOUS_FREQ (1 << 0) /* 1.4 */
	#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)

	/* YCBCR 420 deep color modes */
	#define DRM_EDID_YCBCR420_DC_48 (1 << 2)
	#define DRM_EDID_YCBCR420_DC_36 (1 << 1)
	#define DRM_EDID_YCBCR420_DC_30 (1 << 0)
	#define DRM_EDID_YCBCR420_DC_MASK (DRM_EDID_YCBCR420_DC_48 \| \
	DRM_EDID_YCBCR420_DC_36 \| \
	DRM_EDID_YCBCR420_DC_30)

	/* HDMI 2.1 additional fields */
	#define DRM_EDID_MAX_FRL_RATE_MASK 0xf0
	#define DRM_EDID_FAPA_START_LOCATION (1 << 0)
	#define DRM_EDID_ALLM (1 << 1)
	#define DRM_EDID_FVA (1 << 2)

	/* Deep Color specific */
	#define DRM_EDID_DC_30BIT_420 (1 << 0)
	#define DRM_EDID_DC_36BIT_420 (1 << 1)
	#define DRM_EDID_DC_48BIT_420 (1 << 2)

	/* VRR specific */
	#define DRM_EDID_CNMVRR (1 << 3)
	#define DRM_EDID_CINEMA_VRR (1 << 4)
	#define DRM_EDID_MDELTA (1 << 5)
	#define DRM_EDID_VRR_MAX_UPPER_MASK 0xc0
	#define DRM_EDID_VRR_MAX_LOWER_MASK 0xff
	#define DRM_EDID_VRR_MIN_MASK 0x3f

	/* DSC specific */
	#define DRM_EDID_DSC_10BPC (1 << 0)
	#define DRM_EDID_DSC_12BPC (1 << 1)
	#define DRM_EDID_DSC_16BPC (1 << 2)
	#define DRM_EDID_DSC_ALL_BPP (1 << 3)
	#define DRM_EDID_DSC_NATIVE_420 (1 << 6)
	#define DRM_EDID_DSC_1P2 (1 << 7)
	#define DRM_EDID_DSC_MAX_FRL_RATE_MASK 0xf0
	#define DRM_EDID_DSC_MAX_SLICES 0xf
	#define DRM_EDID_DSC_TOTAL_CHUNK_KBYTES 0x3f

	struct drm_edid_product_id {
	__be16 manufacturer_name;
	__le16 product_code;
	__le32 serial_number;
	u8 week_of_manufacture;
	u8 year_of_manufacture;
	} __packed;

	struct edid {
	u8 header[8];
	/* Vendor & product info */
	union {
	struct drm_edid_product_id product_id;
	struct {
	u8 mfg_id[2];
	u8 prod_code[2];
	u32 serial; /* FIXME: byte order */
	u8 mfg_week;
	u8 mfg_year;
	} __packed;
	} __packed;
	/* 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 blue_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;
	} __packed;

	/* EDID matching */
	struct drm_edid_ident {
	/* ID encoded by drm_edid_encode_panel_id() */
	u32 panel_id;
	const char *name;
	};

	#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 */
	};

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

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

	void
	drm_hdmi_avi_infoframe_quant_range(struct hdmi_avi_infoframe *frame,
	const struct drm_connector *connector,
	const struct drm_display_mode *mode,
	enum hdmi_quantization_range rgb_quant_range);

	/**
	* drm_edid_decode_mfg_id - Decode the manufacturer ID
	* @mfg_id: The manufacturer ID
	* @vend: A 4-byte buffer to store the 3-letter vendor string plus a '\0'
	* termination
	*/
	static inline const char *drm_edid_decode_mfg_id(u16 mfg_id, char vend[4])
	{
	vend[0] = '@' + ((mfg_id >> 10) & 0x1f);
	vend[1] = '@' + ((mfg_id >> 5) & 0x1f);
	vend[2] = '@' + ((mfg_id >> 0) & 0x1f);
	vend[3] = '\0';

	return vend;
	}

	/**
	* drm_edid_encode_panel_id - Encode an ID for matching against drm_edid_get_panel_id()
	* @vend_chr_0: First character of the vendor string.
	* @vend_chr_1: Second character of the vendor string.
	* @vend_chr_2: Third character of the vendor string.
	* @product_id: The 16-bit product ID.
	*
	* This is a macro so that it can be calculated at compile time and used
	* as an initializer.
	*
	* For instance:
	* drm_edid_encode_panel_id('B', 'O', 'E', 0x2d08) => 0x09e52d08
	*
	* Return: a 32-bit ID per panel.
	*/
	#define drm_edid_encode_panel_id(vend_chr_0, vend_chr_1, vend_chr_2, product_id) \
	((((u32)(vend_chr_0) - '@') & 0x1f) << 26 \| \
	(((u32)(vend_chr_1) - '@') & 0x1f) << 21 \| \
	(((u32)(vend_chr_2) - '@') & 0x1f) << 16 \| \
	((product_id) & 0xffff))

	/**
	* drm_edid_decode_panel_id - Decode a panel ID from drm_edid_encode_panel_id()
	* @panel_id: The panel ID to decode.
	* @vend: A 4-byte buffer to store the 3-letter vendor string plus a '\0'
	* termination
	* @product_id: The product ID will be returned here.
	*
	* For instance, after:
	* drm_edid_decode_panel_id(0x09e52d08, vend, &product_id)
	* These will be true:
	* vend[0] = 'B'
	* vend[1] = 'O'
	* vend[2] = 'E'
	* vend[3] = '\0'
	* product_id = 0x2d08
	*/
	static inline void drm_edid_decode_panel_id(u32 panel_id, char vend[4], u16 *product_id)
	{
	*product_id = (u16)(panel_id & 0xffff);
	drm_edid_decode_mfg_id(panel_id >> 16, vend);
	}

	bool drm_probe_ddc(struct i2c_adapter *adapter);
	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);
	struct edid drm_get_edid(struct drm_connector connector,
	struct i2c_adapter *adapter);
	struct edid drm_get_edid_switcheroo(struct drm_connector connector,
	struct i2c_adapter *adapter);
	struct edid drm_edid_duplicate(const struct edid edid);
	int drm_add_edid_modes(struct drm_connector connector, struct edid edid);
	int drm_edid_override_connector_update(struct drm_connector *connector);

	u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
	bool drm_detect_hdmi_monitor(const struct edid *edid);
	bool drm_detect_monitor_audio(const struct edid *edid);
	enum hdmi_quantization_range
	drm_default_rgb_quant_range(const struct drm_display_mode *mode);
	int drm_add_modes_noedid(struct drm_connector *connector,
	int hdisplay, int vdisplay);

	int drm_edid_header_is_valid(const void *edid);
	bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
	bool *edid_corrupt);
	bool drm_edid_is_valid(struct edid *edid);
	void drm_edid_get_monitor_name(const struct edid edid, char name,
	int buflen);
	struct drm_display_mode drm_mode_find_dmt(struct drm_device dev,
	int hsize, int vsize, int fresh,
	bool rb);
	struct drm_display_mode *
	drm_display_mode_from_cea_vic(struct drm_device *dev,
	u8 video_code);

	/* Interface based on struct drm_edid */
	const struct drm_edid drm_edid_alloc(const void edid, size_t size);
	const struct drm_edid drm_edid_dup(const struct drm_edid drm_edid);
	void drm_edid_free(const struct drm_edid *drm_edid);
	bool drm_edid_valid(const struct drm_edid *drm_edid);
	const struct edid drm_edid_raw(const struct drm_edid drm_edid);
	const struct drm_edid drm_edid_read(struct drm_connector connector);
	const struct drm_edid drm_edid_read_ddc(struct drm_connector connector,
	struct i2c_adapter *adapter);
	const struct drm_edid drm_edid_read_custom(struct drm_connector connector,
	int (read_block)(void context, u8 *buf, unsigned int block, size_t len),
	void *context);
	const struct drm_edid drm_edid_read_base_block(struct i2c_adapter adapter);
	const struct drm_edid drm_edid_read_switcheroo(struct drm_connector connector,
	struct i2c_adapter *adapter);
	int drm_edid_connector_update(struct drm_connector *connector,
	const struct drm_edid *edid);
	int drm_edid_connector_add_modes(struct drm_connector *connector);
	bool drm_edid_is_digital(const struct drm_edid *drm_edid);
	void drm_edid_get_product_id(const struct drm_edid *drm_edid,
	struct drm_edid_product_id *id);
	void drm_edid_print_product_id(struct drm_printer *p,
	const struct drm_edid_product_id *id, bool raw);
	u32 drm_edid_get_panel_id(const struct drm_edid *drm_edid);
	bool drm_edid_match(const struct drm_edid *drm_edid,
	const struct drm_edid_ident *ident);

	#endif /* __DRM_EDID_H__ */