1 /* 2 * Copyright © 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 * 23 * 24 */ 25 26 #include <drm/drm_atomic_helper.h> 27 #include <drm/drm_dp_dual_mode_helper.h> 28 #include <drm/drm_edid.h> 29 30 #include "intel_display_types.h" 31 #include "intel_dp.h" 32 #include "intel_lspcon.h" 33 34 /* LSPCON OUI Vendor ID(signatures) */ 35 #define LSPCON_VENDOR_PARADE_OUI 0x001CF8 36 #define LSPCON_VENDOR_MCA_OUI 0x0060AD 37 38 /* AUX addresses to write MCA AVI IF */ 39 #define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0 40 #define LSPCON_MCA_AVI_IF_CTRL 0x5DF 41 #define LSPCON_MCA_AVI_IF_KICKOFF (1 << 0) 42 #define LSPCON_MCA_AVI_IF_HANDLED (1 << 1) 43 44 /* AUX addresses to write Parade AVI IF */ 45 #define LSPCON_PARADE_AVI_IF_WRITE_OFFSET 0x516 46 #define LSPCON_PARADE_AVI_IF_CTRL 0x51E 47 #define LSPCON_PARADE_AVI_IF_KICKOFF (1 << 7) 48 #define LSPCON_PARADE_AVI_IF_DATA_SIZE 32 49 50 static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon) 51 { 52 struct intel_digital_port *dig_port = 53 container_of(lspcon, struct intel_digital_port, lspcon); 54 55 return &dig_port->dp; 56 } 57 58 static const char *lspcon_mode_name(enum drm_lspcon_mode mode) 59 { 60 switch (mode) { 61 case DRM_LSPCON_MODE_PCON: 62 return "PCON"; 63 case DRM_LSPCON_MODE_LS: 64 return "LS"; 65 case DRM_LSPCON_MODE_INVALID: 66 return "INVALID"; 67 default: 68 MISSING_CASE(mode); 69 return "INVALID"; 70 } 71 } 72 73 static bool lspcon_detect_vendor(struct intel_lspcon *lspcon) 74 { 75 struct intel_dp *dp = lspcon_to_intel_dp(lspcon); 76 struct drm_dp_dpcd_ident *ident; 77 u32 vendor_oui; 78 79 if (drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd))) { 80 DRM_ERROR("Can't read description\n"); 81 return false; 82 } 83 84 ident = &dp->desc.ident; 85 vendor_oui = (ident->oui[0] << 16) | (ident->oui[1] << 8) | 86 ident->oui[2]; 87 88 switch (vendor_oui) { 89 case LSPCON_VENDOR_MCA_OUI: 90 lspcon->vendor = LSPCON_VENDOR_MCA; 91 DRM_DEBUG_KMS("Vendor: Mega Chips\n"); 92 break; 93 94 case LSPCON_VENDOR_PARADE_OUI: 95 lspcon->vendor = LSPCON_VENDOR_PARADE; 96 DRM_DEBUG_KMS("Vendor: Parade Tech\n"); 97 break; 98 99 default: 100 DRM_ERROR("Invalid/Unknown vendor OUI\n"); 101 return false; 102 } 103 104 return true; 105 } 106 107 static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon) 108 { 109 enum drm_lspcon_mode current_mode; 110 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 111 112 if (drm_lspcon_get_mode(adapter, ¤t_mode)) { 113 DRM_DEBUG_KMS("Error reading LSPCON mode\n"); 114 return DRM_LSPCON_MODE_INVALID; 115 } 116 return current_mode; 117 } 118 119 static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon, 120 enum drm_lspcon_mode mode) 121 { 122 enum drm_lspcon_mode current_mode; 123 124 current_mode = lspcon_get_current_mode(lspcon); 125 if (current_mode == mode) 126 goto out; 127 128 DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n", 129 lspcon_mode_name(mode)); 130 131 wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 400); 132 if (current_mode != mode) 133 DRM_ERROR("LSPCON mode hasn't settled\n"); 134 135 out: 136 DRM_DEBUG_KMS("Current LSPCON mode %s\n", 137 lspcon_mode_name(current_mode)); 138 139 return current_mode; 140 } 141 142 static int lspcon_change_mode(struct intel_lspcon *lspcon, 143 enum drm_lspcon_mode mode) 144 { 145 int err; 146 enum drm_lspcon_mode current_mode; 147 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 148 149 err = drm_lspcon_get_mode(adapter, ¤t_mode); 150 if (err) { 151 DRM_ERROR("Error reading LSPCON mode\n"); 152 return err; 153 } 154 155 if (current_mode == mode) { 156 DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n"); 157 return 0; 158 } 159 160 err = drm_lspcon_set_mode(adapter, mode); 161 if (err < 0) { 162 DRM_ERROR("LSPCON mode change failed\n"); 163 return err; 164 } 165 166 lspcon->mode = mode; 167 DRM_DEBUG_KMS("LSPCON mode changed done\n"); 168 return 0; 169 } 170 171 static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon) 172 { 173 u8 rev; 174 175 if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV, 176 &rev) != 1) { 177 DRM_DEBUG_KMS("Native AUX CH down\n"); 178 return false; 179 } 180 181 DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n", 182 rev >> 4, rev & 0xf); 183 184 return true; 185 } 186 187 static bool lspcon_probe(struct intel_lspcon *lspcon) 188 { 189 int retry; 190 enum drm_dp_dual_mode_type adaptor_type; 191 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 192 enum drm_lspcon_mode expected_mode; 193 194 expected_mode = lspcon_wake_native_aux_ch(lspcon) ? 195 DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS; 196 197 /* Lets probe the adaptor and check its type */ 198 for (retry = 0; retry < 6; retry++) { 199 if (retry) 200 usleep_range(500, 1000); 201 202 adaptor_type = drm_dp_dual_mode_detect(adapter); 203 if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON) 204 break; 205 } 206 207 if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) { 208 DRM_DEBUG_KMS("No LSPCON detected, found %s\n", 209 drm_dp_get_dual_mode_type_name(adaptor_type)); 210 return false; 211 } 212 213 /* Yay ... got a LSPCON device */ 214 DRM_DEBUG_KMS("LSPCON detected\n"); 215 lspcon->mode = lspcon_wait_mode(lspcon, expected_mode); 216 217 /* 218 * In the SW state machine, lets Put LSPCON in PCON mode only. 219 * In this way, it will work with both HDMI 1.4 sinks as well as HDMI 220 * 2.0 sinks. 221 */ 222 if (lspcon->mode != DRM_LSPCON_MODE_PCON) { 223 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) { 224 DRM_ERROR("LSPCON mode change to PCON failed\n"); 225 return false; 226 } 227 } 228 return true; 229 } 230 231 static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon) 232 { 233 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon); 234 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); 235 unsigned long start = jiffies; 236 237 while (1) { 238 if (intel_digital_port_connected(&dig_port->base)) { 239 DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n", 240 jiffies_to_msecs(jiffies - start)); 241 return; 242 } 243 244 if (time_after(jiffies, start + msecs_to_jiffies(1000))) 245 break; 246 247 usleep_range(10000, 15000); 248 } 249 250 DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n"); 251 } 252 253 static bool lspcon_parade_fw_ready(struct drm_dp_aux *aux) 254 { 255 u8 avi_if_ctrl; 256 u8 retry; 257 ssize_t ret; 258 259 /* Check if LSPCON FW is ready for data */ 260 for (retry = 0; retry < 5; retry++) { 261 if (retry) 262 usleep_range(200, 300); 263 264 ret = drm_dp_dpcd_read(aux, LSPCON_PARADE_AVI_IF_CTRL, 265 &avi_if_ctrl, 1); 266 if (ret < 0) { 267 DRM_ERROR("Failed to read AVI IF control\n"); 268 return false; 269 } 270 271 if ((avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF) == 0) 272 return true; 273 } 274 275 DRM_ERROR("Parade FW not ready to accept AVI IF\n"); 276 return false; 277 } 278 279 static bool _lspcon_parade_write_infoframe_blocks(struct drm_dp_aux *aux, 280 u8 *avi_buf) 281 { 282 u8 avi_if_ctrl; 283 u8 block_count = 0; 284 u8 *data; 285 u16 reg; 286 ssize_t ret; 287 288 while (block_count < 4) { 289 if (!lspcon_parade_fw_ready(aux)) { 290 DRM_DEBUG_KMS("LSPCON FW not ready, block %d\n", 291 block_count); 292 return false; 293 } 294 295 reg = LSPCON_PARADE_AVI_IF_WRITE_OFFSET; 296 data = avi_buf + block_count * 8; 297 ret = drm_dp_dpcd_write(aux, reg, data, 8); 298 if (ret < 0) { 299 DRM_ERROR("Failed to write AVI IF block %d\n", 300 block_count); 301 return false; 302 } 303 304 /* 305 * Once a block of data is written, we have to inform the FW 306 * about this by writing into avi infoframe control register: 307 * - set the kickoff bit[7] to 1 308 * - write the block no. to bits[1:0] 309 */ 310 reg = LSPCON_PARADE_AVI_IF_CTRL; 311 avi_if_ctrl = LSPCON_PARADE_AVI_IF_KICKOFF | block_count; 312 ret = drm_dp_dpcd_write(aux, reg, &avi_if_ctrl, 1); 313 if (ret < 0) { 314 DRM_ERROR("Failed to update (0x%x), block %d\n", 315 reg, block_count); 316 return false; 317 } 318 319 block_count++; 320 } 321 322 DRM_DEBUG_KMS("Wrote AVI IF blocks successfully\n"); 323 return true; 324 } 325 326 static bool _lspcon_write_avi_infoframe_parade(struct drm_dp_aux *aux, 327 const u8 *frame, 328 ssize_t len) 329 { 330 u8 avi_if[LSPCON_PARADE_AVI_IF_DATA_SIZE] = {1, }; 331 332 /* 333 * Parade's frames contains 32 bytes of data, divided 334 * into 4 frames: 335 * Token byte (first byte of first frame, must be non-zero) 336 * HB0 to HB2 from AVI IF (3 bytes header) 337 * PB0 to PB27 from AVI IF (28 bytes data) 338 * So it should look like this 339 * first block: | <token> <HB0-HB2> <DB0-DB3> | 340 * next 3 blocks: |<DB4-DB11>|<DB12-DB19>|<DB20-DB28>| 341 */ 342 343 if (len > LSPCON_PARADE_AVI_IF_DATA_SIZE - 1) { 344 DRM_ERROR("Invalid length of infoframes\n"); 345 return false; 346 } 347 348 memcpy(&avi_if[1], frame, len); 349 350 if (!_lspcon_parade_write_infoframe_blocks(aux, avi_if)) { 351 DRM_DEBUG_KMS("Failed to write infoframe blocks\n"); 352 return false; 353 } 354 355 return true; 356 } 357 358 static bool _lspcon_write_avi_infoframe_mca(struct drm_dp_aux *aux, 359 const u8 *buffer, ssize_t len) 360 { 361 int ret; 362 u32 val = 0; 363 u32 retry; 364 u16 reg; 365 const u8 *data = buffer; 366 367 reg = LSPCON_MCA_AVI_IF_WRITE_OFFSET; 368 while (val < len) { 369 /* DPCD write for AVI IF can fail on a slow FW day, so retry */ 370 for (retry = 0; retry < 5; retry++) { 371 ret = drm_dp_dpcd_write(aux, reg, (void *)data, 1); 372 if (ret == 1) { 373 break; 374 } else if (retry < 4) { 375 mdelay(50); 376 continue; 377 } else { 378 DRM_ERROR("DPCD write failed at:0x%x\n", reg); 379 return false; 380 } 381 } 382 val++; reg++; data++; 383 } 384 385 val = 0; 386 reg = LSPCON_MCA_AVI_IF_CTRL; 387 ret = drm_dp_dpcd_read(aux, reg, &val, 1); 388 if (ret < 0) { 389 DRM_ERROR("DPCD read failed, address 0x%x\n", reg); 390 return false; 391 } 392 393 /* Indicate LSPCON chip about infoframe, clear bit 1 and set bit 0 */ 394 val &= ~LSPCON_MCA_AVI_IF_HANDLED; 395 val |= LSPCON_MCA_AVI_IF_KICKOFF; 396 397 ret = drm_dp_dpcd_write(aux, reg, &val, 1); 398 if (ret < 0) { 399 DRM_ERROR("DPCD read failed, address 0x%x\n", reg); 400 return false; 401 } 402 403 val = 0; 404 ret = drm_dp_dpcd_read(aux, reg, &val, 1); 405 if (ret < 0) { 406 DRM_ERROR("DPCD read failed, address 0x%x\n", reg); 407 return false; 408 } 409 410 if (val == LSPCON_MCA_AVI_IF_HANDLED) 411 DRM_DEBUG_KMS("AVI IF handled by FW\n"); 412 413 return true; 414 } 415 416 void lspcon_write_infoframe(struct intel_encoder *encoder, 417 const struct intel_crtc_state *crtc_state, 418 unsigned int type, 419 const void *frame, ssize_t len) 420 { 421 bool ret; 422 struct intel_dp *intel_dp = enc_to_intel_dp(encoder); 423 struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder); 424 425 /* LSPCON only needs AVI IF */ 426 if (type != HDMI_INFOFRAME_TYPE_AVI) 427 return; 428 429 if (lspcon->vendor == LSPCON_VENDOR_MCA) 430 ret = _lspcon_write_avi_infoframe_mca(&intel_dp->aux, 431 frame, len); 432 else 433 ret = _lspcon_write_avi_infoframe_parade(&intel_dp->aux, 434 frame, len); 435 436 if (!ret) { 437 DRM_ERROR("Failed to write AVI infoframes\n"); 438 return; 439 } 440 441 DRM_DEBUG_DRIVER("AVI infoframes updated successfully\n"); 442 } 443 444 void lspcon_read_infoframe(struct intel_encoder *encoder, 445 const struct intel_crtc_state *crtc_state, 446 unsigned int type, 447 void *frame, ssize_t len) 448 { 449 /* FIXME implement this */ 450 } 451 452 void lspcon_set_infoframes(struct intel_encoder *encoder, 453 bool enable, 454 const struct intel_crtc_state *crtc_state, 455 const struct drm_connector_state *conn_state) 456 { 457 ssize_t ret; 458 union hdmi_infoframe frame; 459 u8 buf[VIDEO_DIP_DATA_SIZE]; 460 struct intel_digital_port *dig_port = enc_to_dig_port(encoder); 461 struct intel_lspcon *lspcon = &dig_port->lspcon; 462 const struct drm_display_mode *adjusted_mode = 463 &crtc_state->hw.adjusted_mode; 464 465 if (!lspcon->active) { 466 DRM_ERROR("Writing infoframes while LSPCON disabled ?\n"); 467 return; 468 } 469 470 /* FIXME precompute infoframes */ 471 472 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi, 473 conn_state->connector, 474 adjusted_mode); 475 if (ret < 0) { 476 DRM_ERROR("couldn't fill AVI infoframe\n"); 477 return; 478 } 479 480 /* 481 * Currently there is no interface defined to 482 * check user preference between RGB/YCBCR444 483 * or YCBCR420. So the only possible case for 484 * YCBCR444 usage is driving YCBCR420 output 485 * with LSPCON, when pipe is configured for 486 * YCBCR444 output and LSPCON takes care of 487 * downsampling it. 488 */ 489 if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444) 490 frame.avi.colorspace = HDMI_COLORSPACE_YUV420; 491 else 492 frame.avi.colorspace = HDMI_COLORSPACE_RGB; 493 494 drm_hdmi_avi_infoframe_quant_range(&frame.avi, 495 conn_state->connector, 496 adjusted_mode, 497 crtc_state->limited_color_range ? 498 HDMI_QUANTIZATION_RANGE_LIMITED : 499 HDMI_QUANTIZATION_RANGE_FULL); 500 501 ret = hdmi_infoframe_pack(&frame, buf, sizeof(buf)); 502 if (ret < 0) { 503 DRM_ERROR("Failed to pack AVI IF\n"); 504 return; 505 } 506 507 dig_port->write_infoframe(encoder, crtc_state, HDMI_INFOFRAME_TYPE_AVI, 508 buf, ret); 509 } 510 511 u32 lspcon_infoframes_enabled(struct intel_encoder *encoder, 512 const struct intel_crtc_state *pipe_config) 513 { 514 /* FIXME actually read this from the hw */ 515 return 0; 516 } 517 518 void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon) 519 { 520 lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON); 521 } 522 523 static bool lspcon_init(struct intel_digital_port *dig_port) 524 { 525 struct intel_dp *dp = &dig_port->dp; 526 struct intel_lspcon *lspcon = &dig_port->lspcon; 527 struct drm_connector *connector = &dp->attached_connector->base; 528 529 lspcon->active = false; 530 lspcon->mode = DRM_LSPCON_MODE_INVALID; 531 532 if (!lspcon_probe(lspcon)) { 533 DRM_ERROR("Failed to probe lspcon\n"); 534 return false; 535 } 536 537 if (drm_dp_read_dpcd_caps(&dp->aux, dp->dpcd) != 0) { 538 DRM_ERROR("LSPCON DPCD read failed\n"); 539 return false; 540 } 541 542 if (!lspcon_detect_vendor(lspcon)) { 543 DRM_ERROR("LSPCON vendor detection failed\n"); 544 return false; 545 } 546 547 connector->ycbcr_420_allowed = true; 548 lspcon->active = true; 549 DRM_DEBUG_KMS("Success: LSPCON init\n"); 550 return true; 551 } 552 553 void lspcon_resume(struct intel_digital_port *dig_port) 554 { 555 struct intel_lspcon *lspcon = &dig_port->lspcon; 556 struct drm_device *dev = dig_port->base.base.dev; 557 struct drm_i915_private *dev_priv = to_i915(dev); 558 enum drm_lspcon_mode expected_mode; 559 560 if (!intel_bios_is_lspcon_present(dev_priv, dig_port->base.port)) 561 return; 562 563 if (!lspcon->active) { 564 if (!lspcon_init(dig_port)) { 565 DRM_ERROR("LSPCON init failed on port %c\n", 566 port_name(dig_port->base.port)); 567 return; 568 } 569 } 570 571 if (lspcon_wake_native_aux_ch(lspcon)) { 572 expected_mode = DRM_LSPCON_MODE_PCON; 573 lspcon_resume_in_pcon_wa(lspcon); 574 } else { 575 expected_mode = DRM_LSPCON_MODE_LS; 576 } 577 578 if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON) 579 return; 580 581 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON)) 582 DRM_ERROR("LSPCON resume failed\n"); 583 else 584 DRM_DEBUG_KMS("LSPCON resume success\n"); 585 } 586