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drm_hdmi_state_helper.c
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linux-6.19.14/drivers/gpu/drm/display/drm_hdmi_state_helper.c
1// SPDX-License-Identifier: MIT 2 3#include <linux/export.h> 4 5#include <drm/drm_atomic.h> 6#include <drm/drm_connector.h> 7#include <drm/drm_edid.h> 8#include <drm/drm_modes.h> 9#include <drm/drm_print.h> 10 11#include <drm/display/drm_hdmi_audio_helper.h> 12#include <drm/display/drm_hdmi_cec_helper.h> 13#include <drm/display/drm_hdmi_helper.h> 14#include <drm/display/drm_hdmi_state_helper.h> 15 16/** 17 * DOC: hdmi helpers 18 * 19 * These functions contain an implementation of the HDMI specification 20 * in the form of KMS helpers. 21 * 22 * It contains TMDS character rate computation, automatic selection of 23 * output formats, infoframes generation, etc. 24 * 25 * Infoframes Compliance 26 * ~~~~~~~~~~~~~~~~~~~~~ 27 * 28 * Drivers using the helpers will expose the various infoframes 29 * generated according to the HDMI specification in debugfs. 30 * 31 * Compliance can then be tested using ``edid-decode`` from the ``v4l-utils`` project 32 * (https://git.linuxtv.org/v4l-utils.git/). A sample run would look like: 33 * 34 * .. code-block:: bash 35 * 36 * # edid-decode \ 37 * -I /sys/kernel/debug/dri/1/HDMI-A-1/infoframes/audio \ 38 * -I /sys/kernel/debug/dri/1/HDMI-A-1/infoframes/avi \ 39 * -I /sys/kernel/debug/dri/1/HDMI-A-1/infoframes/hdmi \ 40 * -I /sys/kernel/debug/dri/1/HDMI-A-1/infoframes/hdr_drm \ 41 * -I /sys/kernel/debug/dri/1/HDMI-A-1/infoframes/spd \ 42 * /sys/class/drm/card1-HDMI-A-1/edid \ 43 * -c 44 * 45 * edid-decode (hex): 46 * 47 * 00 ff ff ff ff ff ff 00 1e 6d f4 5b 1e ef 06 00 48 * 07 20 01 03 80 2f 34 78 ea 24 05 af 4f 42 ab 25 49 * 0f 50 54 21 08 00 d1 c0 61 40 45 40 01 01 01 01 50 * 01 01 01 01 01 01 98 d0 00 40 a1 40 d4 b0 30 20 51 * 3a 00 d1 0b 12 00 00 1a 00 00 00 fd 00 3b 3d 1e 52 * b2 31 00 0a 20 20 20 20 20 20 00 00 00 fc 00 4c 53 * 47 20 53 44 51 48 44 0a 20 20 20 20 00 00 00 ff 54 * 00 32 30 37 4e 54 52 4c 44 43 34 33 30 0a 01 46 55 * 56 * 02 03 42 72 23 09 07 07 4d 01 03 04 90 12 13 1f 57 * 22 5d 5e 5f 60 61 83 01 00 00 6d 03 0c 00 10 00 58 * b8 3c 20 00 60 01 02 03 67 d8 5d c4 01 78 80 03 59 * e3 0f 00 18 e2 00 6a e3 05 c0 00 e6 06 05 01 52 60 * 52 51 11 5d 00 a0 a0 40 29 b0 30 20 3a 00 d1 0b 61 * 12 00 00 1a 00 00 00 00 00 00 00 00 00 00 00 00 62 * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63 * 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c3 64 * 65 * ---------------- 66 * 67 * Block 0, Base EDID: 68 * EDID Structure Version & Revision: 1.3 69 * Vendor & Product Identification: 70 * Manufacturer: GSM 71 * Model: 23540 72 * Serial Number: 454430 (0x0006ef1e) 73 * Made in: week 7 of 2022 74 * Basic Display Parameters & Features: 75 * Digital display 76 * Maximum image size: 47 cm x 52 cm 77 * Gamma: 2.20 78 * DPMS levels: Standby Suspend Off 79 * RGB color display 80 * First detailed timing is the preferred timing 81 * Color Characteristics: 82 * Red : 0.6835, 0.3105 83 * Green: 0.2587, 0.6679 84 * Blue : 0.1445, 0.0585 85 * White: 0.3134, 0.3291 86 * Established Timings I & II: 87 * DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz 88 * DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz 89 * DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz 90 * Standard Timings: 91 * DMT 0x52: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz 92 * DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz 93 * DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz 94 * Detailed Timing Descriptors: 95 * DTD 1: 2560x2880 59.966580 Hz 8:9 185.417 kHz 534.000000 MHz (465 mm x 523 mm) 96 * Hfront 48 Hsync 32 Hback 240 Hpol P 97 * Vfront 3 Vsync 10 Vback 199 Vpol N 98 * Display Range Limits: 99 * Monitor ranges (GTF): 59-61 Hz V, 30-178 kHz H, max dotclock 490 MHz 100 * Display Product Name: 'LG SDQHD' 101 * Display Product Serial Number: '207NTRLDC430' 102 * Extension blocks: 1 103 * Checksum: 0x46 104 * 105 * ---------------- 106 * 107 * Block 1, CTA-861 Extension Block: 108 * Revision: 3 109 * Basic audio support 110 * Supports YCbCr 4:4:4 111 * Supports YCbCr 4:2:2 112 * Native detailed modes: 2 113 * Audio Data Block: 114 * Linear PCM: 115 * Max channels: 2 116 * Supported sample rates (kHz): 48 44.1 32 117 * Supported sample sizes (bits): 24 20 16 118 * Video Data Block: 119 * VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz 120 * VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz 121 * VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz 122 * VIC 16: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (native) 123 * VIC 18: 720x576 50.000000 Hz 16:9 31.250 kHz 27.000000 MHz 124 * VIC 19: 1280x720 50.000000 Hz 16:9 37.500 kHz 74.250000 MHz 125 * VIC 31: 1920x1080 50.000000 Hz 16:9 56.250 kHz 148.500000 MHz 126 * VIC 34: 1920x1080 30.000000 Hz 16:9 33.750 kHz 74.250000 MHz 127 * VIC 93: 3840x2160 24.000000 Hz 16:9 54.000 kHz 297.000000 MHz 128 * VIC 94: 3840x2160 25.000000 Hz 16:9 56.250 kHz 297.000000 MHz 129 * VIC 95: 3840x2160 30.000000 Hz 16:9 67.500 kHz 297.000000 MHz 130 * VIC 96: 3840x2160 50.000000 Hz 16:9 112.500 kHz 594.000000 MHz 131 * VIC 97: 3840x2160 60.000000 Hz 16:9 135.000 kHz 594.000000 MHz 132 * Speaker Allocation Data Block: 133 * FL/FR - Front Left/Right 134 * Vendor-Specific Data Block (HDMI), OUI 00-0C-03: 135 * Source physical address: 1.0.0.0 136 * Supports_AI 137 * DC_36bit 138 * DC_30bit 139 * DC_Y444 140 * Maximum TMDS clock: 300 MHz 141 * Extended HDMI video details: 142 * HDMI VICs: 143 * HDMI VIC 1: 3840x2160 30.000000 Hz 16:9 67.500 kHz 297.000000 MHz 144 * HDMI VIC 2: 3840x2160 25.000000 Hz 16:9 56.250 kHz 297.000000 MHz 145 * HDMI VIC 3: 3840x2160 24.000000 Hz 16:9 54.000 kHz 297.000000 MHz 146 * Vendor-Specific Data Block (HDMI Forum), OUI C4-5D-D8: 147 * Version: 1 148 * Maximum TMDS Character Rate: 600 MHz 149 * SCDC Present 150 * Supports 12-bits/component Deep Color 4:2:0 Pixel Encoding 151 * Supports 10-bits/component Deep Color 4:2:0 Pixel Encoding 152 * YCbCr 4:2:0 Capability Map Data Block: 153 * VIC 96: 3840x2160 50.000000 Hz 16:9 112.500 kHz 594.000000 MHz 154 * VIC 97: 3840x2160 60.000000 Hz 16:9 135.000 kHz 594.000000 MHz 155 * Video Capability Data Block: 156 * YCbCr quantization: No Data 157 * RGB quantization: Selectable (via AVI Q) 158 * PT scan behavior: Always Underscanned 159 * IT scan behavior: Always Underscanned 160 * CE scan behavior: Always Underscanned 161 * Colorimetry Data Block: 162 * BT2020YCC 163 * BT2020RGB 164 * HDR Static Metadata Data Block: 165 * Electro optical transfer functions: 166 * Traditional gamma - SDR luminance range 167 * SMPTE ST2084 168 * Supported static metadata descriptors: 169 * Static metadata type 1 170 * Desired content max luminance: 82 (295.365 cd/m^2) 171 * Desired content max frame-average luminance: 82 (295.365 cd/m^2) 172 * Desired content min luminance: 81 (0.298 cd/m^2) 173 * Detailed Timing Descriptors: 174 * DTD 2: 2560x2880 29.986961 Hz 8:9 87.592 kHz 238.250000 MHz (465 mm x 523 mm) 175 * Hfront 48 Hsync 32 Hback 80 Hpol P 176 * Vfront 3 Vsync 10 Vback 28 Vpol N 177 * Checksum: 0xc3 Unused space in Extension Block: 43 bytes 178 * 179 * ---------------- 180 * 181 * edid-decode 1.29.0-5346 182 * edid-decode SHA: c363e9aa6d70 2025-03-11 11:41:18 183 * 184 * Warnings: 185 * 186 * Block 1, CTA-861 Extension Block: 187 * IT Video Formats are overscanned by default, but normally this should be underscanned. 188 * Video Data Block: VIC 1 and the first DTD are not identical. Is this intended? 189 * Video Data Block: All VICs are in ascending order, and the first (preferred) VIC <= 4, is that intended? 190 * Video Capability Data Block: Set Selectable YCbCr Quantization to avoid interop issues. 191 * Video Capability Data Block: S_PT is equal to S_IT and S_CE, so should be set to 0 instead. 192 * Colorimetry Data Block: Set the sRGB colorimetry bit to avoid interop issues. 193 * Display Product Serial Number is set, so the Serial Number in the Base EDID should be 0. 194 * EDID: 195 * Base EDID: Some timings are out of range of the Monitor Ranges: 196 * Vertical Freq: 24.000 - 60.317 Hz (Monitor: 59.000 - 61.000 Hz) 197 * Horizontal Freq: 31.250 - 185.416 kHz (Monitor: 30.000 - 178.000 kHz) 198 * Maximum Clock: 594.000 MHz (Monitor: 490.000 MHz) 199 * 200 * Failures: 201 * 202 * Block 1, CTA-861 Extension Block: 203 * Video Capability Data Block: IT video formats are always underscanned, but bit 7 of Byte 3 of the CTA-861 Extension header is set to overscanned. 204 * EDID: 205 * CTA-861: Native progressive timings are a mix of several resolutions. 206 * 207 * EDID conformity: FAIL 208 * 209 * ================ 210 * 211 * InfoFrame of '/sys/kernel/debug/dri/1/HDMI-A-1/infoframes/audio' was empty. 212 * 213 * ================ 214 * 215 * edid-decode InfoFrame (hex): 216 * 217 * 82 02 0d 31 12 28 04 00 00 00 00 00 00 00 00 00 218 * 00 219 * 220 * ---------------- 221 * 222 * HDMI InfoFrame Checksum: 0x31 223 * 224 * AVI InfoFrame 225 * Version: 2 226 * Length: 13 227 * Y: Color Component Sample Format: RGB 228 * A: Active Format Information Present: Yes 229 * B: Bar Data Present: Bar Data not present 230 * S: Scan Information: Composed for an underscanned display 231 * C: Colorimetry: No Data 232 * M: Picture Aspect Ratio: 16:9 233 * R: Active Portion Aspect Ratio: 8 234 * ITC: IT Content: No Data 235 * EC: Extended Colorimetry: xvYCC601 236 * Q: RGB Quantization Range: Limited Range 237 * SC: Non-Uniform Picture Scaling: No Known non-uniform scaling 238 * YQ: YCC Quantization Range: Limited Range 239 * CN: IT Content Type: Graphics 240 * PR: Pixel Data Repetition Count: 0 241 * Line Number of End of Top Bar: 0 242 * Line Number of Start of Bottom Bar: 0 243 * Pixel Number of End of Left Bar: 0 244 * Pixel Number of Start of Right Bar: 0 245 * 246 * ---------------- 247 * 248 * AVI InfoFrame conformity: PASS 249 * 250 * ================ 251 * 252 * edid-decode InfoFrame (hex): 253 * 254 * 81 01 05 49 03 0c 00 20 01 255 * 256 * ---------------- 257 * 258 * HDMI InfoFrame Checksum: 0x49 259 * 260 * Vendor-Specific InfoFrame (HDMI), OUI 00-0C-03 261 * Version: 1 262 * Length: 5 263 * HDMI Video Format: HDMI_VIC is present 264 * HDMI VIC 1: 3840x2160 30.000000 Hz 16:9 67.500 kHz 297.000000 MHz 265 * 266 * ---------------- 267 * 268 * Vendor-Specific InfoFrame (HDMI), OUI 00-0C-03 conformity: PASS 269 * 270 * ================ 271 * 272 * InfoFrame of '/sys/kernel/debug/dri/1/HDMI-A-1/infoframes/hdr_drm' was empty. 273 * 274 * ================ 275 * 276 * edid-decode InfoFrame (hex): 277 * 278 * 83 01 19 93 42 72 6f 61 64 63 6f 6d 56 69 64 65 279 * 6f 63 6f 72 65 00 00 00 00 00 00 00 09 280 * 281 * ---------------- 282 * 283 * HDMI InfoFrame Checksum: 0x93 284 * 285 * Source Product Description InfoFrame 286 * Version: 1 287 * Length: 25 288 * Vendor Name: 'Broadcom' 289 * Product Description: 'Videocore' 290 * Source Information: PC general 291 * 292 * ---------------- 293 * 294 * Source Product Description InfoFrame conformity: PASS 295 * 296 * Testing 297 * ~~~~~~~ 298 * 299 * The helpers have unit testing and can be tested using kunit with: 300 * 301 * .. code-block:: bash 302 * 303 * $ ./tools/testing/kunit/kunit.py run \ 304 * --kunitconfig=drivers/gpu/drm/tests \ 305 * drm_atomic_helper_connector_hdmi_* 306 */ 307 308/** 309 * __drm_atomic_helper_connector_hdmi_reset() - Initializes all HDMI @drm_connector_state resources 310 * @connector: DRM connector 311 * @new_conn_state: connector state to reset 312 * 313 * Initializes all HDMI resources from a @drm_connector_state without 314 * actually allocating it. This is useful for HDMI drivers, in 315 * combination with __drm_atomic_helper_connector_reset() or 316 * drm_atomic_helper_connector_reset(). 317 */ 318void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector, 319 struct drm_connector_state *new_conn_state) 320{ 321 unsigned int max_bpc = connector->max_bpc; 322 323 new_conn_state->max_bpc = max_bpc; 324 new_conn_state->max_requested_bpc = max_bpc; 325 new_conn_state->hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO; 326} 327EXPORT_SYMBOL(__drm_atomic_helper_connector_hdmi_reset); 328 329static const struct drm_display_mode * 330connector_state_get_mode(const struct drm_connector_state *conn_state) 331{ 332 struct drm_atomic_state *state; 333 struct drm_crtc_state *crtc_state; 334 struct drm_crtc *crtc; 335 336 state = conn_state->state; 337 if (!state) 338 return NULL; 339 340 crtc = conn_state->crtc; 341 if (!crtc) 342 return NULL; 343 344 crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 345 if (!crtc_state) 346 return NULL; 347 348 return &crtc_state->mode; 349} 350 351static bool hdmi_is_limited_range(const struct drm_connector *connector, 352 const struct drm_connector_state *conn_state) 353{ 354 const struct drm_display_info *info = &connector->display_info; 355 const struct drm_display_mode *mode = 356 connector_state_get_mode(conn_state); 357 358 /* 359 * The Broadcast RGB property only applies to RGB format, and 360 * i915 just assumes limited range for YCbCr output, so let's 361 * just do the same. 362 */ 363 if (conn_state->hdmi.output_format != HDMI_COLORSPACE_RGB) 364 return true; 365 366 if (conn_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_FULL) 367 return false; 368 369 if (conn_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_LIMITED) 370 return true; 371 372 if (!info->is_hdmi) 373 return false; 374 375 return drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED; 376} 377 378static bool 379sink_supports_format_bpc(const struct drm_connector *connector, 380 const struct drm_display_info *info, 381 const struct drm_display_mode *mode, 382 unsigned int format, unsigned int bpc) 383{ 384 struct drm_device *dev = connector->dev; 385 u8 vic = drm_match_cea_mode(mode); 386 387 /* 388 * CTA-861-F, section 5.4 - Color Coding & Quantization states 389 * that the bpc must be 8, 10, 12 or 16 except for the default 390 * 640x480 VIC1 where the value must be 8. 391 * 392 * The definition of default here is ambiguous but the spec 393 * refers to VIC1 being the default timing in several occasions 394 * so our understanding is that for the default timing (ie, 395 * VIC1), the bpc must be 8. 396 */ 397 if (vic == 1 && bpc != 8) { 398 drm_dbg_kms(dev, "VIC1 requires a bpc of 8, got %u\n", bpc); 399 return false; 400 } 401 402 if (!info->is_hdmi && 403 (format != HDMI_COLORSPACE_RGB || bpc != 8)) { 404 drm_dbg_kms(dev, "DVI Monitors require an RGB output at 8 bpc\n"); 405 return false; 406 } 407 408 if (!(connector->hdmi.supported_formats & BIT(format))) { 409 drm_dbg_kms(dev, "%s format unsupported by the connector.\n", 410 drm_hdmi_connector_get_output_format_name(format)); 411 return false; 412 } 413 414 if (drm_mode_is_420_only(info, mode) && format != HDMI_COLORSPACE_YUV420) { 415 drm_dbg_kms(dev, "Mode can be only supported in YUV420 format.\n"); 416 return false; 417 } 418 419 switch (format) { 420 case HDMI_COLORSPACE_RGB: 421 drm_dbg_kms(dev, "RGB Format, checking the constraints.\n"); 422 423 /* 424 * In some cases, like when the EDID readout fails, or 425 * is not an HDMI compliant EDID for some reason, the 426 * color_formats field will be blank and not report any 427 * format supported. In such a case, assume that RGB is 428 * supported so we can keep things going and light up 429 * the display. 430 */ 431 if (!(info->color_formats & DRM_COLOR_FORMAT_RGB444)) 432 drm_warn(dev, "HDMI Sink doesn't support RGB, something's wrong.\n"); 433 434 if (bpc == 10 && !(info->edid_hdmi_rgb444_dc_modes & DRM_EDID_HDMI_DC_30)) { 435 drm_dbg_kms(dev, "10 BPC but sink doesn't support Deep Color 30.\n"); 436 return false; 437 } 438 439 if (bpc == 12 && !(info->edid_hdmi_rgb444_dc_modes & DRM_EDID_HDMI_DC_36)) { 440 drm_dbg_kms(dev, "12 BPC but sink doesn't support Deep Color 36.\n"); 441 return false; 442 } 443 444 drm_dbg_kms(dev, "RGB format supported in that configuration.\n"); 445 446 return true; 447 448 case HDMI_COLORSPACE_YUV420: 449 drm_dbg_kms(dev, "YUV420 format, checking the constraints.\n"); 450 451 if (!(info->color_formats & DRM_COLOR_FORMAT_YCBCR420)) { 452 drm_dbg_kms(dev, "Sink doesn't support YUV420.\n"); 453 return false; 454 } 455 456 if (!drm_mode_is_420(info, mode)) { 457 drm_dbg_kms(dev, "Mode cannot be supported in YUV420 format.\n"); 458 return false; 459 } 460 461 if (bpc == 10 && !(info->hdmi.y420_dc_modes & DRM_EDID_YCBCR420_DC_30)) { 462 drm_dbg_kms(dev, "10 BPC but sink doesn't support Deep Color 30.\n"); 463 return false; 464 } 465 466 if (bpc == 12 && !(info->hdmi.y420_dc_modes & DRM_EDID_YCBCR420_DC_36)) { 467 drm_dbg_kms(dev, "12 BPC but sink doesn't support Deep Color 36.\n"); 468 return false; 469 } 470 471 if (bpc == 16 && !(info->hdmi.y420_dc_modes & DRM_EDID_YCBCR420_DC_48)) { 472 drm_dbg_kms(dev, "16 BPC but sink doesn't support Deep Color 48.\n"); 473 return false; 474 } 475 476 drm_dbg_kms(dev, "YUV420 format supported in that configuration.\n"); 477 478 return true; 479 480 case HDMI_COLORSPACE_YUV422: 481 drm_dbg_kms(dev, "YUV422 format, checking the constraints.\n"); 482 483 if (!(info->color_formats & DRM_COLOR_FORMAT_YCBCR422)) { 484 drm_dbg_kms(dev, "Sink doesn't support YUV422.\n"); 485 return false; 486 } 487 488 if (bpc > 12) { 489 drm_dbg_kms(dev, "YUV422 only supports 12 bpc or lower.\n"); 490 return false; 491 } 492 493 /* 494 * HDMI Spec 1.3 - Section 6.5 Pixel Encodings and Color Depth 495 * states that Deep Color is not relevant for YUV422 so we 496 * don't need to check the Deep Color bits in the EDIDs here. 497 */ 498 499 drm_dbg_kms(dev, "YUV422 format supported in that configuration.\n"); 500 501 return true; 502 503 case HDMI_COLORSPACE_YUV444: 504 drm_dbg_kms(dev, "YUV444 format, checking the constraints.\n"); 505 506 if (!(info->color_formats & DRM_COLOR_FORMAT_YCBCR444)) { 507 drm_dbg_kms(dev, "Sink doesn't support YUV444.\n"); 508 return false; 509 } 510 511 if (bpc == 10 && !(info->edid_hdmi_ycbcr444_dc_modes & DRM_EDID_HDMI_DC_30)) { 512 drm_dbg_kms(dev, "10 BPC but sink doesn't support Deep Color 30.\n"); 513 return false; 514 } 515 516 if (bpc == 12 && !(info->edid_hdmi_ycbcr444_dc_modes & DRM_EDID_HDMI_DC_36)) { 517 drm_dbg_kms(dev, "12 BPC but sink doesn't support Deep Color 36.\n"); 518 return false; 519 } 520 521 drm_dbg_kms(dev, "YUV444 format supported in that configuration.\n"); 522 523 return true; 524 } 525 526 drm_dbg_kms(dev, "Unsupported pixel format.\n"); 527 return false; 528} 529 530static enum drm_mode_status 531hdmi_clock_valid(const struct drm_connector *connector, 532 const struct drm_display_mode *mode, 533 unsigned long long clock) 534{ 535 const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs; 536 const struct drm_display_info *info = &connector->display_info; 537 538 if (info->max_tmds_clock && clock > info->max_tmds_clock * 1000) 539 return MODE_CLOCK_HIGH; 540 541 if (funcs && funcs->tmds_char_rate_valid) { 542 enum drm_mode_status status; 543 544 status = funcs->tmds_char_rate_valid(connector, mode, clock); 545 if (status != MODE_OK) 546 return status; 547 } 548 549 return MODE_OK; 550} 551 552static int 553hdmi_compute_clock(const struct drm_connector *connector, 554 struct drm_connector_state *conn_state, 555 const struct drm_display_mode *mode, 556 unsigned int bpc, enum hdmi_colorspace fmt) 557{ 558 enum drm_mode_status status; 559 unsigned long long clock; 560 561 clock = drm_hdmi_compute_mode_clock(mode, bpc, fmt); 562 if (!clock) 563 return -EINVAL; 564 565 status = hdmi_clock_valid(connector, mode, clock); 566 if (status != MODE_OK) 567 return -EINVAL; 568 569 conn_state->hdmi.tmds_char_rate = clock; 570 571 return 0; 572} 573 574static bool 575hdmi_try_format_bpc(const struct drm_connector *connector, 576 struct drm_connector_state *conn_state, 577 const struct drm_display_mode *mode, 578 unsigned int bpc, enum hdmi_colorspace fmt) 579{ 580 const struct drm_display_info *info = &connector->display_info; 581 struct drm_device *dev = connector->dev; 582 int ret; 583 584 drm_dbg_kms(dev, "Trying %s output format with %u bpc\n", 585 drm_hdmi_connector_get_output_format_name(fmt), 586 bpc); 587 588 if (!sink_supports_format_bpc(connector, info, mode, fmt, bpc)) { 589 drm_dbg_kms(dev, "%s output format not supported with %u bpc\n", 590 drm_hdmi_connector_get_output_format_name(fmt), 591 bpc); 592 return false; 593 } 594 595 ret = hdmi_compute_clock(connector, conn_state, mode, bpc, fmt); 596 if (ret) { 597 drm_dbg_kms(dev, "Couldn't compute clock for %s output format and %u bpc\n", 598 drm_hdmi_connector_get_output_format_name(fmt), 599 bpc); 600 return false; 601 } 602 603 drm_dbg_kms(dev, "%s output format supported with %u bpc (TMDS char rate: %llu Hz)\n", 604 drm_hdmi_connector_get_output_format_name(fmt), 605 bpc, conn_state->hdmi.tmds_char_rate); 606 607 return true; 608} 609 610static int 611hdmi_compute_format_bpc(const struct drm_connector *connector, 612 struct drm_connector_state *conn_state, 613 const struct drm_display_mode *mode, 614 unsigned int max_bpc, enum hdmi_colorspace fmt) 615{ 616 struct drm_device *dev = connector->dev; 617 unsigned int bpc; 618 int ret; 619 620 for (bpc = max_bpc; bpc >= 8; bpc -= 2) { 621 ret = hdmi_try_format_bpc(connector, conn_state, mode, bpc, fmt); 622 if (!ret) 623 continue; 624 625 conn_state->hdmi.output_bpc = bpc; 626 conn_state->hdmi.output_format = fmt; 627 628 drm_dbg_kms(dev, 629 "Mode %ux%u @ %uHz: Found configuration: bpc: %u, fmt: %s, clock: %llu\n", 630 mode->hdisplay, mode->vdisplay, drm_mode_vrefresh(mode), 631 conn_state->hdmi.output_bpc, 632 drm_hdmi_connector_get_output_format_name(conn_state->hdmi.output_format), 633 conn_state->hdmi.tmds_char_rate); 634 635 return 0; 636 } 637 638 drm_dbg_kms(dev, "Failed. %s output format not supported for any bpc count.\n", 639 drm_hdmi_connector_get_output_format_name(fmt)); 640 641 return -EINVAL; 642} 643 644static int 645hdmi_compute_config(const struct drm_connector *connector, 646 struct drm_connector_state *conn_state, 647 const struct drm_display_mode *mode) 648{ 649 unsigned int max_bpc = clamp_t(unsigned int, 650 conn_state->max_bpc, 651 8, connector->max_bpc); 652 int ret; 653 654 ret = hdmi_compute_format_bpc(connector, conn_state, mode, max_bpc, 655 HDMI_COLORSPACE_RGB); 656 if (ret) { 657 if (connector->ycbcr_420_allowed) { 658 ret = hdmi_compute_format_bpc(connector, conn_state, 659 mode, max_bpc, 660 HDMI_COLORSPACE_YUV420); 661 if (ret) 662 drm_dbg_kms(connector->dev, 663 "YUV420 output format doesn't work.\n"); 664 } else { 665 drm_dbg_kms(connector->dev, 666 "YUV420 output format not allowed for connector.\n"); 667 ret = -EINVAL; 668 } 669 } 670 671 return ret; 672} 673 674static int hdmi_generate_avi_infoframe(const struct drm_connector *connector, 675 struct drm_connector_state *conn_state) 676{ 677 const struct drm_display_mode *mode = 678 connector_state_get_mode(conn_state); 679 struct drm_connector_hdmi_infoframe *infoframe = 680 &conn_state->hdmi.infoframes.avi; 681 struct hdmi_avi_infoframe *frame = 682 &infoframe->data.avi; 683 bool is_limited_range = conn_state->hdmi.is_limited_range; 684 enum hdmi_quantization_range rgb_quant_range = 685 is_limited_range ? HDMI_QUANTIZATION_RANGE_LIMITED : HDMI_QUANTIZATION_RANGE_FULL; 686 int ret; 687 688 infoframe->set = false; 689 690 ret = drm_hdmi_avi_infoframe_from_display_mode(frame, connector, mode); 691 if (ret) 692 return ret; 693 694 frame->colorspace = conn_state->hdmi.output_format; 695 696 /* 697 * FIXME: drm_hdmi_avi_infoframe_quant_range() doesn't handle 698 * YUV formats at all at the moment, so if we ever support YUV 699 * formats this needs to be revised. 700 */ 701 drm_hdmi_avi_infoframe_quant_range(frame, connector, mode, rgb_quant_range); 702 drm_hdmi_avi_infoframe_colorimetry(frame, conn_state); 703 drm_hdmi_avi_infoframe_bars(frame, conn_state); 704 705 infoframe->set = true; 706 707 return 0; 708} 709 710static int hdmi_generate_spd_infoframe(const struct drm_connector *connector, 711 struct drm_connector_state *conn_state) 712{ 713 struct drm_connector_hdmi_infoframe *infoframe = 714 &conn_state->hdmi.infoframes.spd; 715 struct hdmi_spd_infoframe *frame = 716 &infoframe->data.spd; 717 int ret; 718 719 infoframe->set = false; 720 721 ret = hdmi_spd_infoframe_init(frame, 722 connector->hdmi.vendor, 723 connector->hdmi.product); 724 if (ret) 725 return ret; 726 727 frame->sdi = HDMI_SPD_SDI_PC; 728 729 infoframe->set = true; 730 731 return 0; 732} 733 734static int hdmi_generate_hdr_infoframe(const struct drm_connector *connector, 735 struct drm_connector_state *conn_state) 736{ 737 struct drm_connector_hdmi_infoframe *infoframe = 738 &conn_state->hdmi.infoframes.hdr_drm; 739 struct hdmi_drm_infoframe *frame = 740 &infoframe->data.drm; 741 int ret; 742 743 infoframe->set = false; 744 745 if (connector->max_bpc < 10) 746 return 0; 747 748 if (!conn_state->hdr_output_metadata) 749 return 0; 750 751 ret = drm_hdmi_infoframe_set_hdr_metadata(frame, conn_state); 752 if (ret) 753 return ret; 754 755 infoframe->set = true; 756 757 return 0; 758} 759 760static int hdmi_generate_hdmi_vendor_infoframe(const struct drm_connector *connector, 761 struct drm_connector_state *conn_state) 762{ 763 const struct drm_display_info *info = &connector->display_info; 764 const struct drm_display_mode *mode = 765 connector_state_get_mode(conn_state); 766 struct drm_connector_hdmi_infoframe *infoframe = 767 &conn_state->hdmi.infoframes.hdmi; 768 struct hdmi_vendor_infoframe *frame = 769 &infoframe->data.vendor.hdmi; 770 int ret; 771 772 infoframe->set = false; 773 774 if (!info->has_hdmi_infoframe) 775 return 0; 776 777 ret = drm_hdmi_vendor_infoframe_from_display_mode(frame, connector, mode); 778 if (ret) 779 return ret; 780 781 infoframe->set = true; 782 783 return 0; 784} 785 786static int 787hdmi_generate_infoframes(const struct drm_connector *connector, 788 struct drm_connector_state *conn_state) 789{ 790 const struct drm_display_info *info = &connector->display_info; 791 int ret; 792 793 if (!info->is_hdmi) 794 return 0; 795 796 ret = hdmi_generate_avi_infoframe(connector, conn_state); 797 if (ret) 798 return ret; 799 800 ret = hdmi_generate_spd_infoframe(connector, conn_state); 801 if (ret) 802 return ret; 803 804 /* 805 * Audio Infoframes will be generated by ALSA, and updated by 806 * drm_atomic_helper_connector_hdmi_update_audio_infoframe(). 807 */ 808 809 ret = hdmi_generate_hdr_infoframe(connector, conn_state); 810 if (ret) 811 return ret; 812 813 ret = hdmi_generate_hdmi_vendor_infoframe(connector, conn_state); 814 if (ret) 815 return ret; 816 817 return 0; 818} 819 820/** 821 * drm_atomic_helper_connector_hdmi_check() - Helper to check HDMI connector atomic state 822 * @connector: DRM Connector 823 * @state: the DRM State object 824 * 825 * Provides a default connector state check handler for HDMI connectors. 826 * Checks that a desired connector update is valid, and updates various 827 * fields of derived state. 828 * 829 * RETURNS: 830 * Zero on success, or an errno code otherwise. 831 */ 832int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector, 833 struct drm_atomic_state *state) 834{ 835 struct drm_connector_state *old_conn_state = 836 drm_atomic_get_old_connector_state(state, connector); 837 struct drm_connector_state *new_conn_state = 838 drm_atomic_get_new_connector_state(state, connector); 839 const struct drm_display_mode *mode = 840 connector_state_get_mode(new_conn_state); 841 int ret; 842 843 if (!new_conn_state->crtc || !new_conn_state->best_encoder) 844 return 0; 845 846 ret = hdmi_compute_config(connector, new_conn_state, mode); 847 if (ret) 848 return ret; 849 850 new_conn_state->hdmi.is_limited_range = hdmi_is_limited_range(connector, new_conn_state); 851 852 ret = hdmi_generate_infoframes(connector, new_conn_state); 853 if (ret) 854 return ret; 855 856 if (old_conn_state->hdmi.broadcast_rgb != new_conn_state->hdmi.broadcast_rgb || 857 old_conn_state->hdmi.output_bpc != new_conn_state->hdmi.output_bpc || 858 old_conn_state->hdmi.output_format != new_conn_state->hdmi.output_format) { 859 struct drm_crtc *crtc = new_conn_state->crtc; 860 struct drm_crtc_state *crtc_state; 861 862 crtc_state = drm_atomic_get_crtc_state(state, crtc); 863 if (IS_ERR(crtc_state)) 864 return PTR_ERR(crtc_state); 865 866 crtc_state->mode_changed = true; 867 } 868 869 return 0; 870} 871EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_check); 872 873/** 874 * drm_hdmi_connector_mode_valid() - Check if mode is valid for HDMI connector 875 * @connector: DRM connector to validate the mode 876 * @mode: Display mode to validate 877 * 878 * Generic .mode_valid implementation for HDMI connectors. 879 */ 880enum drm_mode_status 881drm_hdmi_connector_mode_valid(struct drm_connector *connector, 882 const struct drm_display_mode *mode) 883{ 884 unsigned long long clock; 885 886 clock = drm_hdmi_compute_mode_clock(mode, 8, HDMI_COLORSPACE_RGB); 887 if (!clock) 888 return MODE_ERROR; 889 890 return hdmi_clock_valid(connector, mode, clock); 891} 892EXPORT_SYMBOL(drm_hdmi_connector_mode_valid); 893 894static int clear_device_infoframe(struct drm_connector *connector, 895 enum hdmi_infoframe_type type) 896{ 897 const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs; 898 struct drm_device *dev = connector->dev; 899 int ret; 900 901 drm_dbg_kms(dev, "Clearing infoframe type 0x%x\n", type); 902 903 if (!funcs || !funcs->clear_infoframe) { 904 drm_dbg_kms(dev, "Function not implemented, bailing.\n"); 905 return 0; 906 } 907 908 ret = funcs->clear_infoframe(connector, type); 909 if (ret) { 910 drm_dbg_kms(dev, "Call failed: %d\n", ret); 911 return ret; 912 } 913 914 return 0; 915} 916 917static int clear_infoframe(struct drm_connector *connector, 918 struct drm_connector_hdmi_infoframe *old_frame) 919{ 920 int ret; 921 922 ret = clear_device_infoframe(connector, old_frame->data.any.type); 923 if (ret) 924 return ret; 925 926 return 0; 927} 928 929static int write_device_infoframe(struct drm_connector *connector, 930 union hdmi_infoframe *frame) 931{ 932 const struct drm_connector_hdmi_funcs *funcs = connector->hdmi.funcs; 933 struct drm_device *dev = connector->dev; 934 u8 buffer[HDMI_INFOFRAME_SIZE(MAX)]; 935 int ret; 936 int len; 937 938 drm_dbg_kms(dev, "Writing infoframe type %x\n", frame->any.type); 939 940 if (!funcs || !funcs->write_infoframe) { 941 drm_dbg_kms(dev, "Function not implemented, bailing.\n"); 942 return -EINVAL; 943 } 944 945 len = hdmi_infoframe_pack(frame, buffer, sizeof(buffer)); 946 if (len < 0) 947 return len; 948 949 ret = funcs->write_infoframe(connector, frame->any.type, buffer, len); 950 if (ret) { 951 drm_dbg_kms(dev, "Call failed: %d\n", ret); 952 return ret; 953 } 954 955 return 0; 956} 957 958static int write_infoframe(struct drm_connector *connector, 959 struct drm_connector_hdmi_infoframe *new_frame) 960{ 961 int ret; 962 963 ret = write_device_infoframe(connector, &new_frame->data); 964 if (ret) 965 return ret; 966 967 return 0; 968} 969 970static int write_or_clear_infoframe(struct drm_connector *connector, 971 struct drm_connector_hdmi_infoframe *old_frame, 972 struct drm_connector_hdmi_infoframe *new_frame) 973{ 974 if (new_frame->set) 975 return write_infoframe(connector, new_frame); 976 977 if (old_frame->set && !new_frame->set) 978 return clear_infoframe(connector, old_frame); 979 980 return 0; 981} 982 983/** 984 * drm_atomic_helper_connector_hdmi_update_infoframes - Update the Infoframes 985 * @connector: A pointer to the HDMI connector 986 * @state: The HDMI connector state to generate the infoframe from 987 * 988 * This function is meant for HDMI connector drivers to write their 989 * infoframes. It will typically be used in a 990 * @drm_connector_helper_funcs.atomic_enable implementation. 991 * 992 * Returns: 993 * Zero on success, error code on failure. 994 */ 995int drm_atomic_helper_connector_hdmi_update_infoframes(struct drm_connector *connector, 996 struct drm_atomic_state *state) 997{ 998 struct drm_connector_state *old_conn_state = 999 drm_atomic_get_old_connector_state(state, connector); 1000 struct drm_connector_state *new_conn_state = 1001 drm_atomic_get_new_connector_state(state, connector); 1002 struct drm_display_info *info = &connector->display_info; 1003 int ret; 1004 1005 if (!info->is_hdmi) 1006 return 0; 1007 1008 mutex_lock(&connector->hdmi.infoframes.lock); 1009 1010 ret = write_or_clear_infoframe(connector, 1011 &old_conn_state->hdmi.infoframes.avi, 1012 &new_conn_state->hdmi.infoframes.avi); 1013 if (ret) 1014 goto out; 1015 1016 if (connector->hdmi.infoframes.audio.set) { 1017 ret = write_infoframe(connector, 1018 &connector->hdmi.infoframes.audio); 1019 if (ret) 1020 goto out; 1021 } 1022 1023 ret = write_or_clear_infoframe(connector, 1024 &old_conn_state->hdmi.infoframes.hdr_drm, 1025 &new_conn_state->hdmi.infoframes.hdr_drm); 1026 if (ret) 1027 goto out; 1028 1029 ret = write_or_clear_infoframe(connector, 1030 &old_conn_state->hdmi.infoframes.spd, 1031 &new_conn_state->hdmi.infoframes.spd); 1032 if (ret) 1033 goto out; 1034 1035 if (info->has_hdmi_infoframe) { 1036 ret = write_or_clear_infoframe(connector, 1037 &old_conn_state->hdmi.infoframes.hdmi, 1038 &new_conn_state->hdmi.infoframes.hdmi); 1039 if (ret) 1040 goto out; 1041 } 1042 1043out: 1044 mutex_unlock(&connector->hdmi.infoframes.lock); 1045 return ret; 1046} 1047EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_infoframes); 1048 1049/** 1050 * drm_atomic_helper_connector_hdmi_update_audio_infoframe - Update the Audio Infoframe 1051 * @connector: A pointer to the HDMI connector 1052 * @frame: A pointer to the audio infoframe to write 1053 * 1054 * This function is meant for HDMI connector drivers to update their 1055 * audio infoframe. It will typically be used in one of the ALSA hooks 1056 * (most likely prepare). 1057 * 1058 * Returns: 1059 * Zero on success, error code on failure. 1060 */ 1061int 1062drm_atomic_helper_connector_hdmi_update_audio_infoframe(struct drm_connector *connector, 1063 struct hdmi_audio_infoframe *frame) 1064{ 1065 struct drm_connector_hdmi_infoframe *infoframe = 1066 &connector->hdmi.infoframes.audio; 1067 struct drm_display_info *info = &connector->display_info; 1068 int ret; 1069 1070 if (!info->is_hdmi) 1071 return 0; 1072 1073 mutex_lock(&connector->hdmi.infoframes.lock); 1074 1075 memcpy(&infoframe->data, frame, sizeof(infoframe->data)); 1076 infoframe->set = true; 1077 1078 ret = write_infoframe(connector, infoframe); 1079 1080 mutex_unlock(&connector->hdmi.infoframes.lock); 1081 1082 return ret; 1083} 1084EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_update_audio_infoframe); 1085 1086/** 1087 * drm_atomic_helper_connector_hdmi_clear_audio_infoframe - Stop sending the Audio Infoframe 1088 * @connector: A pointer to the HDMI connector 1089 * 1090 * This function is meant for HDMI connector drivers to stop sending their 1091 * audio infoframe. It will typically be used in one of the ALSA hooks 1092 * (most likely shutdown). 1093 * 1094 * Returns: 1095 * Zero on success, error code on failure. 1096 */ 1097int 1098drm_atomic_helper_connector_hdmi_clear_audio_infoframe(struct drm_connector *connector) 1099{ 1100 struct drm_connector_hdmi_infoframe *infoframe = 1101 &connector->hdmi.infoframes.audio; 1102 struct drm_display_info *info = &connector->display_info; 1103 int ret; 1104 1105 if (!info->is_hdmi) 1106 return 0; 1107 1108 mutex_lock(&connector->hdmi.infoframes.lock); 1109 1110 infoframe->set = false; 1111 1112 ret = clear_infoframe(connector, infoframe); 1113 1114 memset(&infoframe->data, 0, sizeof(infoframe->data)); 1115 1116 mutex_unlock(&connector->hdmi.infoframes.lock); 1117 1118 return ret; 1119} 1120EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_clear_audio_infoframe); 1121 1122static void 1123drm_atomic_helper_connector_hdmi_update(struct drm_connector *connector, 1124 enum drm_connector_status status) 1125{ 1126 const struct drm_edid *drm_edid; 1127 1128 if (status == connector_status_disconnected) { 1129 // TODO: also handle scramber, HDMI sink disconnected. 1130 drm_connector_hdmi_audio_plugged_notify(connector, false); 1131 drm_edid_connector_update(connector, NULL); 1132 drm_connector_cec_phys_addr_invalidate(connector); 1133 return; 1134 } 1135 1136 if (connector->hdmi.funcs->read_edid) 1137 drm_edid = connector->hdmi.funcs->read_edid(connector); 1138 else 1139 drm_edid = drm_edid_read(connector); 1140 1141 drm_edid_connector_update(connector, drm_edid); 1142 1143 drm_edid_free(drm_edid); 1144 1145 if (status == connector_status_connected) { 1146 // TODO: also handle scramber, HDMI sink is now connected. 1147 drm_connector_hdmi_audio_plugged_notify(connector, true); 1148 drm_connector_cec_phys_addr_set(connector); 1149 } 1150} 1151 1152/** 1153 * drm_atomic_helper_connector_hdmi_hotplug - Handle the hotplug event for the HDMI connector 1154 * @connector: A pointer to the HDMI connector 1155 * @status: Connection status 1156 * 1157 * This function should be called as a part of the .detect() / .detect_ctx() 1158 * callbacks for all status changes. 1159 */ 1160void drm_atomic_helper_connector_hdmi_hotplug(struct drm_connector *connector, 1161 enum drm_connector_status status) 1162{ 1163 drm_atomic_helper_connector_hdmi_update(connector, status); 1164} 1165EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_hotplug); 1166 1167/** 1168 * drm_atomic_helper_connector_hdmi_force - HDMI Connector implementation of the force callback 1169 * @connector: A pointer to the HDMI connector 1170 * 1171 * This function implements the .force() callback for the HDMI connectors. It 1172 * can either be used directly as the callback or should be called from within 1173 * the .force() callback implementation to maintain the HDMI-specific 1174 * connector's data. 1175 */ 1176void drm_atomic_helper_connector_hdmi_force(struct drm_connector *connector) 1177{ 1178 drm_atomic_helper_connector_hdmi_update(connector, connector->status); 1179} 1180EXPORT_SYMBOL(drm_atomic_helper_connector_hdmi_force);
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