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linux/include/drm/drm_edid.h
Ville Syrjälä c7943bb324 drm/edid: Handle EDID 1.4 range descriptor h/vfreq offsets 
EDID 1.4 introduced some extra flags in the range
descriptor to support min/max h/vfreq >= 255. Consult them
to correctly parse the vfreq limits.

Note that some combinations of the flags are documented
as "reserved" (as are some other values in the descriptor)
but explicitly checking for those doesn't seem particularly
worthwile since we end up with bogus results whether we
decode them or not.

v2: Increase the storage to u16 to make it work (Jani)
    Note the "reserved" values situation (Jani)
v3: Document the EDID version number in the defines
    Drop some bogus (u8) casts

Cc: stable@vger.kernel.org
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/6519
References: https://gitlab.freedesktop.org/drm/intel/-/issues/6484
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220826213501.31490-2-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
2022-09-02 16:38:51 +03:00

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/*
* 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>
#include <linux/hdmi.h>
#include <drm/drm_mode.h>
struct drm_device;
struct drm_edid;
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;
} __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));
#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
#define DRM_EDID_RANGE_LIMITS_ONLY_FLAG 0x01
#define DRM_EDID_SECONDARY_GTF_SUPPORT_FLAG 0x02
#define DRM_EDID_CVT_SUPPORT_FLAG 0x04
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;
} __attribute__((packed)) 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];
} __attribute__((packed)) 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;
} __attribute__((packed)) 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) /* 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)
#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
/* 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_MASK 0x7f
# 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 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;
} __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_connector_state;
struct drm_display_mode;
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);
#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
struct edid *drm_load_edid_firmware(struct drm_connector *connector);
int __drm_set_edid_firmware_path(const char *path);
int __drm_get_edid_firmware_path(char *buf, size_t bufsize);
#else
static inline struct edid *
drm_load_edid_firmware(struct drm_connector *connector)
{
return ERR_PTR(-ENOENT);
}
#endif
bool drm_edid_are_equal(const struct edid *edid1, const struct edid *edid2);
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_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_spk_alloc - Get speaker allocation
* @eld: pointer to an ELD memory structure
*
* The returned value is the speakers mask. User has to use %DRM_ELD_SPEAKER
* field definitions to identify speakers.
*/
static inline u8 drm_eld_get_spk_alloc(const uint8_t *eld)
{
return eld[DRM_ELD_SPEAKER] & DRM_ELD_SPEAKER_MASK;
}
/**
* 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;
}
/**
* 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);
u32 drm_edid_get_panel_id(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_add_override_edid_modes(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);
void drm_set_preferred_mode(struct drm_connector *connector,
int hpref, int vpref);
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);
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);
int drm_edid_connector_update(struct drm_connector *connector,
const struct drm_edid *edid);
const u8 *drm_find_edid_extension(const struct drm_edid *drm_edid,
int ext_id, int *ext_index);
#endif /* __DRM_EDID_H__ */
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