include/drm/drm_edid.h

   1 /*
   2  * Copyright © 2007-2008 Intel Corporation
   3  *   Jesse Barnes <jesse.barnes@intel.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23 #ifndef __DRM_EDID_H__
  24 #define __DRM_EDID_H__
  25
  26 #include <linux/types.h>
  27
  28 struct drm_device;
  29 struct i2c_adapter;
  30
  31 #define EDID_LENGTH 128
  32 #define DDC_ADDR 0x50
  33 #define DDC_ADDR2 0x52 /* E-DDC 1.2 - where DisplayID can hide */
  34
  35 #define CEA_EXT     0x02
  36 #define VTB_EXT     0x10
  37 #define DI_EXT      0x40
  38 #define LS_EXT      0x50
  39 #define MI_EXT      0x60
  40 #define DISPLAYID_EXT 0x70
  41
  42 struct est_timings {
  43         u8 t1;
  44         u8 t2;
  45         u8 mfg_rsvd;
  46 } __attribute__((packed));
  47
  48 /* 00=16:10, 01=4:3, 10=5:4, 11=16:9 */
  49 #define EDID_TIMING_ASPECT_SHIFT 6
  50 #define EDID_TIMING_ASPECT_MASK  (0x3 << EDID_TIMING_ASPECT_SHIFT)
  51
  52 /* need to add 60 */
  53 #define EDID_TIMING_VFREQ_SHIFT  0
  54 #define EDID_TIMING_VFREQ_MASK   (0x3f << EDID_TIMING_VFREQ_SHIFT)
  55
  56 struct std_timing {
  57         u8 hsize; /* need to multiply by 8 then add 248 */
  58         u8 vfreq_aspect;
  59 } __attribute__((packed));
  60
  61 #define DRM_EDID_PT_HSYNC_POSITIVE (1 << 1)
  62 #define DRM_EDID_PT_VSYNC_POSITIVE (1 << 2)
  63 #define DRM_EDID_PT_SEPARATE_SYNC  (3 << 3)
  64 #define DRM_EDID_PT_STEREO         (1 << 5)
  65 #define DRM_EDID_PT_INTERLACED     (1 << 7)
  66
  67 /* If detailed data is pixel timing */
  68 struct detailed_pixel_timing {
  69         u8 hactive_lo;
  70         u8 hblank_lo;
  71         u8 hactive_hblank_hi;
  72         u8 vactive_lo;
  73         u8 vblank_lo;
  74         u8 vactive_vblank_hi;
  75         u8 hsync_offset_lo;
  76         u8 hsync_pulse_width_lo;
  77         u8 vsync_offset_pulse_width_lo;
  78         u8 hsync_vsync_offset_pulse_width_hi;
  79         u8 width_mm_lo;
  80         u8 height_mm_lo;
  81         u8 width_height_mm_hi;
  82         u8 hborder;
  83         u8 vborder;
  84         u8 misc;
  85 } __attribute__((packed));
  86
  87 /* If it's not pixel timing, it'll be one of the below */
  88 struct detailed_data_string {
  89         u8 str[13];
  90 } __attribute__((packed));
  91
  92 struct detailed_data_monitor_range {
  93         u8 min_vfreq;
  94         u8 max_vfreq;
  95         u8 min_hfreq_khz;
  96         u8 max_hfreq_khz;
  97         u8 pixel_clock_mhz; /* need to multiply by 10 */
  98         u8 flags;
  99         union {
 100                 struct {
 101                         u8 reserved;
 102                         u8 hfreq_start_khz; /* need to multiply by 2 */
 103                         u8 c; /* need to divide by 2 */
 104                         __le16 m;
 105                         u8 k;
 106                         u8 j; /* need to divide by 2 */
 107                 } __attribute__((packed)) gtf2;
 108                 struct {
 109                         u8 version;
 110                         u8 data1; /* high 6 bits: extra clock resolution */
 111                         u8 data2; /* plus low 2 of above: max hactive */
 112                         u8 supported_aspects;
 113                         u8 flags; /* preferred aspect and blanking support */
 114                         u8 supported_scalings;
 115                         u8 preferred_refresh;
 116                 } __attribute__((packed)) cvt;
 117         } formula;
 118 } __attribute__((packed));
 119
 120 struct detailed_data_wpindex {
 121         u8 white_yx_lo; /* Lower 2 bits each */
 122         u8 white_x_hi;
 123         u8 white_y_hi;
 124         u8 gamma; /* need to divide by 100 then add 1 */
 125 } __attribute__((packed));
 126
 127 struct detailed_data_color_point {
 128         u8 windex1;
 129         u8 wpindex1[3];
 130         u8 windex2;
 131         u8 wpindex2[3];
 132 } __attribute__((packed));
 133
 134 struct cvt_timing {
 135         u8 code[3];
 136 } __attribute__((packed));
 137
 138 struct detailed_non_pixel {
 139         u8 pad1;
 140         u8 type; /* ff=serial, fe=string, fd=monitor range, fc=monitor name
 141                     fb=color point data, fa=standard timing data,
 142                     f9=undefined, f8=mfg. reserved */
 143         u8 pad2;
 144         union {
 145                 struct detailed_data_string str;
 146                 struct detailed_data_monitor_range range;
 147                 struct detailed_data_wpindex color;
 148                 struct std_timing timings[6];
 149                 struct cvt_timing cvt[4];
 150         } data;
 151 } __attribute__((packed));
 152
 153 #define EDID_DETAIL_EST_TIMINGS 0xf7
 154 #define EDID_DETAIL_CVT_3BYTE 0xf8
 155 #define EDID_DETAIL_COLOR_MGMT_DATA 0xf9
 156 #define EDID_DETAIL_STD_MODES 0xfa
 157 #define EDID_DETAIL_MONITOR_CPDATA 0xfb
 158 #define EDID_DETAIL_MONITOR_NAME 0xfc
 159 #define EDID_DETAIL_MONITOR_RANGE 0xfd
 160 #define EDID_DETAIL_MONITOR_STRING 0xfe
 161 #define EDID_DETAIL_MONITOR_SERIAL 0xff
 162
 163 struct detailed_timing {
 164         __le16 pixel_clock; /* need to multiply by 10 KHz */
 165         union {
 166                 struct detailed_pixel_timing pixel_data;
 167                 struct detailed_non_pixel other_data;
 168         } data;
 169 } __attribute__((packed));
 170
 171 #define DRM_EDID_INPUT_SERRATION_VSYNC (1 << 0)
 172 #define DRM_EDID_INPUT_SYNC_ON_GREEN   (1 << 1)
 173 #define DRM_EDID_INPUT_COMPOSITE_SYNC  (1 << 2)
 174 #define DRM_EDID_INPUT_SEPARATE_SYNCS  (1 << 3)
 175 #define DRM_EDID_INPUT_BLANK_TO_BLACK  (1 << 4)
 176 #define DRM_EDID_INPUT_VIDEO_LEVEL     (3 << 5)
 177 #define DRM_EDID_INPUT_DIGITAL         (1 << 7)
 178 #define DRM_EDID_DIGITAL_DEPTH_MASK    (7 << 4)
 179 #define DRM_EDID_DIGITAL_DEPTH_UNDEF   (0 << 4)
 180 #define DRM_EDID_DIGITAL_DEPTH_6       (1 << 4)
 181 #define DRM_EDID_DIGITAL_DEPTH_8       (2 << 4)
 182 #define DRM_EDID_DIGITAL_DEPTH_10      (3 << 4)
 183 #define DRM_EDID_DIGITAL_DEPTH_12      (4 << 4)
 184 #define DRM_EDID_DIGITAL_DEPTH_14      (5 << 4)
 185 #define DRM_EDID_DIGITAL_DEPTH_16      (6 << 4)
 186 #define DRM_EDID_DIGITAL_DEPTH_RSVD    (7 << 4)
 187 #define DRM_EDID_DIGITAL_TYPE_UNDEF    (0)
 188 #define DRM_EDID_DIGITAL_TYPE_DVI      (1)
 189 #define DRM_EDID_DIGITAL_TYPE_HDMI_A   (2)
 190 #define DRM_EDID_DIGITAL_TYPE_HDMI_B   (3)
 191 #define DRM_EDID_DIGITAL_TYPE_MDDI     (4)
 192 #define DRM_EDID_DIGITAL_TYPE_DP       (5)
 193
 194 #define DRM_EDID_FEATURE_DEFAULT_GTF      (1 << 0)
 195 #define DRM_EDID_FEATURE_PREFERRED_TIMING (1 << 1)
 196 #define DRM_EDID_FEATURE_STANDARD_COLOR   (1 << 2)
 197 /* If analog */
 198 #define DRM_EDID_FEATURE_DISPLAY_TYPE     (3 << 3) /* 00=mono, 01=rgb, 10=non-rgb, 11=unknown */
 199 /* If digital */
 200 #define DRM_EDID_FEATURE_COLOR_MASK       (3 << 3)
 201 #define DRM_EDID_FEATURE_RGB              (0 << 3)
 202 #define DRM_EDID_FEATURE_RGB_YCRCB444     (1 << 3)
 203 #define DRM_EDID_FEATURE_RGB_YCRCB422     (2 << 3)
 204 #define DRM_EDID_FEATURE_RGB_YCRCB        (3 << 3) /* both 4:4:4 and 4:2:2 */
 205
 206 #define DRM_EDID_FEATURE_PM_ACTIVE_OFF    (1 << 5)
 207 #define DRM_EDID_FEATURE_PM_SUSPEND       (1 << 6)
 208 #define DRM_EDID_FEATURE_PM_STANDBY       (1 << 7)
 209
 210 #define DRM_EDID_HDMI_DC_48               (1 << 6)
 211 #define DRM_EDID_HDMI_DC_36               (1 << 5)
 212 #define DRM_EDID_HDMI_DC_30               (1 << 4)
 213 #define DRM_EDID_HDMI_DC_Y444             (1 << 3)
 214
 215 /* ELD Header Block */
 216 #define DRM_ELD_HEADER_BLOCK_SIZE       4
 217
 218 #define DRM_ELD_VER                     0
 219 # define DRM_ELD_VER_SHIFT              3
 220 # define DRM_ELD_VER_MASK               (0x1f << 3)
 221 # define DRM_ELD_VER_CEA861D            (2 << 3) /* supports 861D or below */
 222 # define DRM_ELD_VER_CANNED             (0x1f << 3)
 223
 224 #define DRM_ELD_BASELINE_ELD_LEN        2       /* in dwords! */
 225
 226 /* ELD Baseline Block for ELD_Ver == 2 */
 227 #define DRM_ELD_CEA_EDID_VER_MNL        4
 228 # define DRM_ELD_CEA_EDID_VER_SHIFT     5
 229 # define DRM_ELD_CEA_EDID_VER_MASK      (7 << 5)
 230 # define DRM_ELD_CEA_EDID_VER_NONE      (0 << 5)
 231 # define DRM_ELD_CEA_EDID_VER_CEA861    (1 << 5)
 232 # define DRM_ELD_CEA_EDID_VER_CEA861A   (2 << 5)
 233 # define DRM_ELD_CEA_EDID_VER_CEA861BCD (3 << 5)
 234 # define DRM_ELD_MNL_SHIFT              0
 235 # define DRM_ELD_MNL_MASK               (0x1f << 0)
 236
 237 #define DRM_ELD_SAD_COUNT_CONN_TYPE     5
 238 # define DRM_ELD_SAD_COUNT_SHIFT        4
 239 # define DRM_ELD_SAD_COUNT_MASK         (0xf << 4)
 240 # define DRM_ELD_CONN_TYPE_SHIFT        2
 241 # define DRM_ELD_CONN_TYPE_MASK         (3 << 2)
 242 # define DRM_ELD_CONN_TYPE_HDMI         (0 << 2)
 243 # define DRM_ELD_CONN_TYPE_DP           (1 << 2)
 244 # define DRM_ELD_SUPPORTS_AI            (1 << 1)
 245 # define DRM_ELD_SUPPORTS_HDCP          (1 << 0)
 246
 247 #define DRM_ELD_AUD_SYNCH_DELAY         6       /* in units of 2 ms */
 248 # define DRM_ELD_AUD_SYNCH_DELAY_MAX    0xfa    /* 500 ms */
 249
 250 #define DRM_ELD_SPEAKER                 7
 251 # define DRM_ELD_SPEAKER_RLRC           (1 << 6)
 252 # define DRM_ELD_SPEAKER_FLRC           (1 << 5)
 253 # define DRM_ELD_SPEAKER_RC             (1 << 4)
 254 # define DRM_ELD_SPEAKER_RLR            (1 << 3)
 255 # define DRM_ELD_SPEAKER_FC             (1 << 2)
 256 # define DRM_ELD_SPEAKER_LFE            (1 << 1)
 257 # define DRM_ELD_SPEAKER_FLR            (1 << 0)
 258
 259 #define DRM_ELD_PORT_ID                 8       /* offsets 8..15 inclusive */
 260 # define DRM_ELD_PORT_ID_LEN            8
 261
 262 #define DRM_ELD_MANUFACTURER_NAME0      16
 263 #define DRM_ELD_MANUFACTURER_NAME1      17
 264
 265 #define DRM_ELD_PRODUCT_CODE0           18
 266 #define DRM_ELD_PRODUCT_CODE1           19
 267
 268 #define DRM_ELD_MONITOR_NAME_STRING     20      /* offsets 20..(20+mnl-1) inclusive */
 269
 270 #define DRM_ELD_CEA_SAD(mnl, sad)       (20 + (mnl) + 3 * (sad))
 271
 272 struct edid {
 273         u8 header[8];
 274         /* Vendor & product info */
 275         u8 mfg_id[2];
 276         u8 prod_code[2];
 277         u32 serial; /* FIXME: byte order */
 278         u8 mfg_week;
 279         u8 mfg_year;
 280         /* EDID version */
 281         u8 version;
 282         u8 revision;
 283         /* Display info: */
 284         u8 input;
 285         u8 width_cm;
 286         u8 height_cm;
 287         u8 gamma;
 288         u8 features;
 289         /* Color characteristics */
 290         u8 red_green_lo;
 291         u8 black_white_lo;
 292         u8 red_x;
 293         u8 red_y;
 294         u8 green_x;
 295         u8 green_y;
 296         u8 blue_x;
 297         u8 blue_y;
 298         u8 white_x;
 299         u8 white_y;
 300         /* Est. timings and mfg rsvd timings*/
 301         struct est_timings established_timings;
 302         /* Standard timings 1-8*/
 303         struct std_timing standard_timings[8];
 304         /* Detailing timings 1-4 */
 305         struct detailed_timing detailed_timings[4];
 306         /* Number of 128 byte ext. blocks */
 307         u8 extensions;
 308         /* Checksum */
 309         u8 checksum;
 310 } __attribute__((packed));
 311
 312 #define EDID_PRODUCT_ID(e) ((e)->prod_code[0] | ((e)->prod_code[1] << 8))
 313
 314 /* Short Audio Descriptor */
 315 struct cea_sad {
 316         u8 format;
 317         u8 channels; /* max number of channels - 1 */
 318         u8 freq;
 319         u8 byte2; /* meaning depends on format */
 320 };
 321
 322 struct drm_encoder;
 323 struct drm_connector;
 324 struct drm_display_mode;
 325 struct hdmi_avi_infoframe;
 326 struct hdmi_vendor_infoframe;
 327
 328 void drm_edid_to_eld(struct drm_connector *connector, struct edid *edid);
 329 int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads);
 330 int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb);
 331 int drm_av_sync_delay(struct drm_connector *connector,
 332                       const struct drm_display_mode *mode);
 333
 334 #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
 335 int drm_load_edid_firmware(struct drm_connector *connector);
 336 #else
 337 static inline int drm_load_edid_firmware(struct drm_connector *connector)
 338 {
 339         return 0;
 340 }
 341 #endif
 342
 343 int
 344 drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
 345                                          const struct drm_display_mode *mode);
 346 int
 347 drm_hdmi_vendor_infoframe_from_display_mode(struct hdmi_vendor_infoframe *frame,
 348                                             const struct drm_display_mode *mode);
 349
 350 /**
 351  * drm_eld_mnl - Get ELD monitor name length in bytes.
 352  * @eld: pointer to an eld memory structure with mnl set
 353  */
 354 static inline int drm_eld_mnl(const uint8_t *eld)
 355 {
 356         return (eld[DRM_ELD_CEA_EDID_VER_MNL] & DRM_ELD_MNL_MASK) >> DRM_ELD_MNL_SHIFT;
 357 }
 358
 359 /**
 360  * drm_eld_sad - Get ELD SAD structures.
 361  * @eld: pointer to an eld memory structure with sad_count set
 362  */
 363 static inline const uint8_t *drm_eld_sad(const uint8_t *eld)
 364 {
 365         unsigned int ver, mnl;
 366
 367         ver = (eld[DRM_ELD_VER] & DRM_ELD_VER_MASK) >> DRM_ELD_VER_SHIFT;
 368         if (ver != 2 && ver != 31)
 369                 return NULL;
 370
 371         mnl = drm_eld_mnl(eld);
 372         if (mnl > 16)
 373                 return NULL;
 374
 375         return eld + DRM_ELD_CEA_SAD(mnl, 0);
 376 }
 377
 378 /**
 379  * drm_eld_sad_count - Get ELD SAD count.
 380  * @eld: pointer to an eld memory structure with sad_count set
 381  */
 382 static inline int drm_eld_sad_count(const uint8_t *eld)
 383 {
 384         return (eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_SAD_COUNT_MASK) >>
 385                 DRM_ELD_SAD_COUNT_SHIFT;
 386 }
 387
 388 /**
 389  * drm_eld_calc_baseline_block_size - Calculate baseline block size in bytes
 390  * @eld: pointer to an eld memory structure with mnl and sad_count set
 391  *
 392  * This is a helper for determining the payload size of the baseline block, in
 393  * bytes, for e.g. setting the Baseline_ELD_Len field in the ELD header block.
 394  */
 395 static inline int drm_eld_calc_baseline_block_size(const uint8_t *eld)
 396 {
 397         return DRM_ELD_MONITOR_NAME_STRING - DRM_ELD_HEADER_BLOCK_SIZE +
 398                 drm_eld_mnl(eld) + drm_eld_sad_count(eld) * 3;
 399 }
 400
 401 /**
 402  * drm_eld_size - Get ELD size in bytes
 403  * @eld: pointer to a complete eld memory structure
 404  *
 405  * The returned value does not include the vendor block. It's vendor specific,
 406  * and comprises of the remaining bytes in the ELD memory buffer after
 407  * drm_eld_size() bytes of header and baseline block.
 408  *
 409  * The returned value is guaranteed to be a multiple of 4.
 410  */
 411 static inline int drm_eld_size(const uint8_t *eld)
 412 {
 413         return DRM_ELD_HEADER_BLOCK_SIZE + eld[DRM_ELD_BASELINE_ELD_LEN] * 4;
 414 }
 415
 416 /**
 417  * drm_eld_get_conn_type - Get device type hdmi/dp connected
 418  * @eld: pointer to an ELD memory structure
 419  *
 420  * The caller need to use %DRM_ELD_CONN_TYPE_HDMI or %DRM_ELD_CONN_TYPE_DP to
 421  * identify the display type connected.
 422  */
 423 static inline u8 drm_eld_get_conn_type(const uint8_t *eld)
 424 {
 425         return eld[DRM_ELD_SAD_COUNT_CONN_TYPE] & DRM_ELD_CONN_TYPE_MASK;
 426 }
 427
 428 bool drm_probe_ddc(struct i2c_adapter *adapter);
 429 struct edid *drm_do_get_edid(struct drm_connector *connector,
 430         int (*get_edid_block)(void *data, u8 *buf, unsigned int block,
 431                               size_t len),
 432         void *data);
 433 struct edid *drm_get_edid(struct drm_connector *connector,
 434                           struct i2c_adapter *adapter);
 435 struct edid *drm_get_edid_switcheroo(struct drm_connector *connector,
 436                                      struct i2c_adapter *adapter);
 437 struct edid *drm_edid_duplicate(const struct edid *edid);
 438 int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid);
 439
 440 u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
 441 enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code);
 442 bool drm_detect_hdmi_monitor(struct edid *edid);
 443 bool drm_detect_monitor_audio(struct edid *edid);
 444 bool drm_rgb_quant_range_selectable(struct edid *edid);
 445 int drm_add_modes_noedid(struct drm_connector *connector,
 446                          int hdisplay, int vdisplay);
 447 void drm_set_preferred_mode(struct drm_connector *connector,
 448                             int hpref, int vpref);
 449
 450 int drm_edid_header_is_valid(const u8 *raw_edid);
 451 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid,
 452                           bool *edid_corrupt);
 453 bool drm_edid_is_valid(struct edid *edid);
 454 void drm_edid_get_monitor_name(struct edid *edid, char *name,
 455                                int buflen);
 456 struct drm_display_mode *drm_mode_find_dmt(struct drm_device *dev,
 457                                            int hsize, int vsize, int fresh,
 458                                            bool rb);
 459
 460 #endif /* __DRM_EDID_H__ */