1/* $NetBSD: intel_lspcon.c,v 1.3 2021/12/19 11:47:33 riastradh Exp $ */ 2 3/* 4 * Copyright �� 2016 Intel Corporation 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 * DEALINGS IN THE SOFTWARE. 24 * 25 * 26 */ 27 28#include <sys/cdefs.h> 29__KERNEL_RCSID(0, "$NetBSD: intel_lspcon.c,v 1.3 2021/12/19 11:47:33 riastradh Exp $"); 30 31#include <drm/drm_atomic_helper.h> 32#include <drm/drm_dp_dual_mode_helper.h> 33#include <drm/drm_edid.h> 34 35#include "intel_display_types.h" 36#include "intel_dp.h" 37#include "intel_lspcon.h" 38 39/* LSPCON OUI Vendor ID(signatures) */ 40#define LSPCON_VENDOR_PARADE_OUI 0x001CF8 41#define LSPCON_VENDOR_MCA_OUI 0x0060AD 42 43/* AUX addresses to write MCA AVI IF */ 44#define LSPCON_MCA_AVI_IF_WRITE_OFFSET 0x5C0 45#define LSPCON_MCA_AVI_IF_CTRL 0x5DF 46#define LSPCON_MCA_AVI_IF_KICKOFF (1 << 0) 47#define LSPCON_MCA_AVI_IF_HANDLED (1 << 1) 48 49/* AUX addresses to write Parade AVI IF */ 50#define LSPCON_PARADE_AVI_IF_WRITE_OFFSET 0x516 51#define LSPCON_PARADE_AVI_IF_CTRL 0x51E 52#define LSPCON_PARADE_AVI_IF_KICKOFF (1 << 7) 53#define LSPCON_PARADE_AVI_IF_DATA_SIZE 32 54 55static struct intel_dp *lspcon_to_intel_dp(struct intel_lspcon *lspcon) 56{ 57 struct intel_digital_port *dig_port = 58 container_of(lspcon, struct intel_digital_port, lspcon); 59 60 return &dig_port->dp; 61} 62 63static const char *lspcon_mode_name(enum drm_lspcon_mode mode) 64{ 65 switch (mode) { 66 case DRM_LSPCON_MODE_PCON: 67 return "PCON"; 68 case DRM_LSPCON_MODE_LS: 69 return "LS"; 70 case DRM_LSPCON_MODE_INVALID: 71 return "INVALID"; 72 default: 73 MISSING_CASE(mode); 74 return "INVALID"; 75 } 76} 77 78static bool lspcon_detect_vendor(struct intel_lspcon *lspcon) 79{ 80 struct intel_dp *dp = lspcon_to_intel_dp(lspcon); 81 struct drm_dp_dpcd_ident *ident; 82 u32 vendor_oui; 83 84 if (drm_dp_read_desc(&dp->aux, &dp->desc, drm_dp_is_branch(dp->dpcd))) { 85 DRM_ERROR("Can't read description\n"); 86 return false; 87 } 88 89 ident = &dp->desc.ident; 90 vendor_oui = (ident->oui[0] << 16) | (ident->oui[1] << 8) | 91 ident->oui[2]; 92 93 switch (vendor_oui) { 94 case LSPCON_VENDOR_MCA_OUI: 95 lspcon->vendor = LSPCON_VENDOR_MCA; 96 DRM_DEBUG_KMS("Vendor: Mega Chips\n"); 97 break; 98 99 case LSPCON_VENDOR_PARADE_OUI: 100 lspcon->vendor = LSPCON_VENDOR_PARADE; 101 DRM_DEBUG_KMS("Vendor: Parade Tech\n"); 102 break; 103 104 default: 105 DRM_ERROR("Invalid/Unknown vendor OUI\n"); 106 return false; 107 } 108 109 return true; 110} 111 112static enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon) 113{ 114 enum drm_lspcon_mode current_mode; 115 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 116 117 if (drm_lspcon_get_mode(adapter, ¤t_mode)) { 118 DRM_DEBUG_KMS("Error reading LSPCON mode\n"); 119 return DRM_LSPCON_MODE_INVALID; 120 } 121 return current_mode; 122} 123 124static enum drm_lspcon_mode lspcon_wait_mode(struct intel_lspcon *lspcon, 125 enum drm_lspcon_mode mode) 126{ 127 enum drm_lspcon_mode current_mode; 128 129 current_mode = lspcon_get_current_mode(lspcon); 130 if (current_mode == mode) 131 goto out; 132 133 DRM_DEBUG_KMS("Waiting for LSPCON mode %s to settle\n", 134 lspcon_mode_name(mode)); 135 136 wait_for((current_mode = lspcon_get_current_mode(lspcon)) == mode, 400); 137 if (current_mode != mode) 138 DRM_ERROR("LSPCON mode hasn't settled\n"); 139 140out: 141 DRM_DEBUG_KMS("Current LSPCON mode %s\n", 142 lspcon_mode_name(current_mode)); 143 144 return current_mode; 145} 146 147static int lspcon_change_mode(struct intel_lspcon *lspcon, 148 enum drm_lspcon_mode mode) 149{ 150 int err; 151 enum drm_lspcon_mode current_mode; 152 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 153 154 err = drm_lspcon_get_mode(adapter, ¤t_mode); 155 if (err) { 156 DRM_ERROR("Error reading LSPCON mode\n"); 157 return err; 158 } 159 160 if (current_mode == mode) { 161 DRM_DEBUG_KMS("Current mode = desired LSPCON mode\n"); 162 return 0; 163 } 164 165 err = drm_lspcon_set_mode(adapter, mode); 166 if (err < 0) { 167 DRM_ERROR("LSPCON mode change failed\n"); 168 return err; 169 } 170 171 lspcon->mode = mode; 172 DRM_DEBUG_KMS("LSPCON mode changed done\n"); 173 return 0; 174} 175 176static bool lspcon_wake_native_aux_ch(struct intel_lspcon *lspcon) 177{ 178 u8 rev; 179 180 if (drm_dp_dpcd_readb(&lspcon_to_intel_dp(lspcon)->aux, DP_DPCD_REV, 181 &rev) != 1) { 182 DRM_DEBUG_KMS("Native AUX CH down\n"); 183 return false; 184 } 185 186 DRM_DEBUG_KMS("Native AUX CH up, DPCD version: %d.%d\n", 187 rev >> 4, rev & 0xf); 188 189 return true; 190} 191 192void lspcon_ycbcr420_config(struct drm_connector *connector, 193 struct intel_crtc_state *crtc_state) 194{ 195 const struct drm_display_info *info = &connector->display_info; 196 const struct drm_display_mode *adjusted_mode = 197 &crtc_state->hw.adjusted_mode; 198 199 if (drm_mode_is_420_only(info, adjusted_mode) && 200 connector->ycbcr_420_allowed) { 201 crtc_state->port_clock /= 2; 202 crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR444; 203 crtc_state->lspcon_downsampling = true; 204 } 205} 206 207static bool lspcon_probe(struct intel_lspcon *lspcon) 208{ 209 int retry; 210 enum drm_dp_dual_mode_type adaptor_type; 211 struct i2c_adapter *adapter = &lspcon_to_intel_dp(lspcon)->aux.ddc; 212 enum drm_lspcon_mode expected_mode; 213 214 expected_mode = lspcon_wake_native_aux_ch(lspcon) ? 215 DRM_LSPCON_MODE_PCON : DRM_LSPCON_MODE_LS; 216 217 /* Lets probe the adaptor and check its type */ 218 for (retry = 0; retry < 6; retry++) { 219 if (retry) 220 usleep_range(500, 1000); 221 222 adaptor_type = drm_dp_dual_mode_detect(adapter); 223 if (adaptor_type == DRM_DP_DUAL_MODE_LSPCON) 224 break; 225 } 226 227 if (adaptor_type != DRM_DP_DUAL_MODE_LSPCON) { 228 DRM_DEBUG_KMS("No LSPCON detected, found %s\n", 229 drm_dp_get_dual_mode_type_name(adaptor_type)); 230 return false; 231 } 232 233 /* Yay ... got a LSPCON device */ 234 DRM_DEBUG_KMS("LSPCON detected\n"); 235 lspcon->mode = lspcon_wait_mode(lspcon, expected_mode); 236 237 /* 238 * In the SW state machine, lets Put LSPCON in PCON mode only. 239 * In this way, it will work with both HDMI 1.4 sinks as well as HDMI 240 * 2.0 sinks. 241 */ 242 if (lspcon->mode != DRM_LSPCON_MODE_PCON) { 243 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON) < 0) { 244 DRM_ERROR("LSPCON mode change to PCON failed\n"); 245 return false; 246 } 247 } 248 return true; 249} 250 251static void lspcon_resume_in_pcon_wa(struct intel_lspcon *lspcon) 252{ 253 struct intel_dp *intel_dp = lspcon_to_intel_dp(lspcon); 254 struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); 255 unsigned long start = jiffies; 256 257 while (1) { 258 if (intel_digital_port_connected(&dig_port->base)) { 259 DRM_DEBUG_KMS("LSPCON recovering in PCON mode after %u ms\n", 260 jiffies_to_msecs(jiffies - start)); 261 return; 262 } 263 264 if (time_after(jiffies, start + msecs_to_jiffies(1000))) 265 break; 266 267 usleep_range(10000, 15000); 268 } 269 270 DRM_DEBUG_KMS("LSPCON DP descriptor mismatch after resume\n"); 271} 272 273static bool lspcon_parade_fw_ready(struct drm_dp_aux *aux) 274{ 275 u8 avi_if_ctrl; 276 u8 retry; 277 ssize_t ret; 278 279 /* Check if LSPCON FW is ready for data */ 280 for (retry = 0; retry < 5; retry++) { 281 if (retry) 282 usleep_range(200, 300); 283 284 ret = drm_dp_dpcd_read(aux, LSPCON_PARADE_AVI_IF_CTRL, 285 &avi_if_ctrl, 1); 286 if (ret < 0) { 287 DRM_ERROR("Failed to read AVI IF control\n"); 288 return false; 289 } 290 291 if ((avi_if_ctrl & LSPCON_PARADE_AVI_IF_KICKOFF) == 0) 292 return true; 293 } 294 295 DRM_ERROR("Parade FW not ready to accept AVI IF\n"); 296 return false; 297} 298 299static bool _lspcon_parade_write_infoframe_blocks(struct drm_dp_aux *aux, 300 u8 *avi_buf) 301{ 302 u8 avi_if_ctrl; 303 u8 block_count = 0; 304 u8 *data; 305 u16 reg; 306 ssize_t ret; 307 308 while (block_count < 4) { 309 if (!lspcon_parade_fw_ready(aux)) { 310 DRM_DEBUG_KMS("LSPCON FW not ready, block %d\n", 311 block_count); 312 return false; 313 } 314 315 reg = LSPCON_PARADE_AVI_IF_WRITE_OFFSET; 316 data = avi_buf + block_count * 8; 317 ret = drm_dp_dpcd_write(aux, reg, data, 8); 318 if (ret < 0) { 319 DRM_ERROR("Failed to write AVI IF block %d\n", 320 block_count); 321 return false; 322 } 323 324 /* 325 * Once a block of data is written, we have to inform the FW 326 * about this by writing into avi infoframe control register: 327 * - set the kickoff bit[7] to 1 328 * - write the block no. to bits[1:0] 329 */ 330 reg = LSPCON_PARADE_AVI_IF_CTRL; 331 avi_if_ctrl = LSPCON_PARADE_AVI_IF_KICKOFF | block_count; 332 ret = drm_dp_dpcd_write(aux, reg, &avi_if_ctrl, 1); 333 if (ret < 0) { 334 DRM_ERROR("Failed to update (0x%x), block %d\n", 335 reg, block_count); 336 return false; 337 } 338 339 block_count++; 340 } 341 342 DRM_DEBUG_KMS("Wrote AVI IF blocks successfully\n"); 343 return true; 344} 345 346static bool _lspcon_write_avi_infoframe_parade(struct drm_dp_aux *aux, 347 const u8 *frame, 348 ssize_t len) 349{ 350 u8 avi_if[LSPCON_PARADE_AVI_IF_DATA_SIZE] = {1, }; 351 352 /* 353 * Parade's frames contains 32 bytes of data, divided 354 * into 4 frames: 355 * Token byte (first byte of first frame, must be non-zero) 356 * HB0 to HB2 from AVI IF (3 bytes header) 357 * PB0 to PB27 from AVI IF (28 bytes data) 358 * So it should look like this 359 * first block: | <token> <HB0-HB2> <DB0-DB3> | 360 * next 3 blocks: |<DB4-DB11>|<DB12-DB19>|<DB20-DB28>| 361 */ 362 363 if (len > LSPCON_PARADE_AVI_IF_DATA_SIZE - 1) { 364 DRM_ERROR("Invalid length of infoframes\n"); 365 return false; 366 } 367 368 memcpy(&avi_if[1], frame, len); 369 370 if (!_lspcon_parade_write_infoframe_blocks(aux, avi_if)) { 371 DRM_DEBUG_KMS("Failed to write infoframe blocks\n"); 372 return false; 373 } 374 375 return true; 376} 377 378static bool _lspcon_write_avi_infoframe_mca(struct drm_dp_aux *aux, 379 const u8 *buffer, ssize_t len) 380{ 381 int ret; 382 u32 val = 0; 383 u32 retry; 384 u16 reg; 385 const u8 *data = buffer; 386 387 reg = LSPCON_MCA_AVI_IF_WRITE_OFFSET; 388 while (val < len) { 389 /* DPCD write for AVI IF can fail on a slow FW day, so retry */ 390 for (retry = 0; retry < 5; retry++) { 391 ret = drm_dp_dpcd_write(aux, reg, (void *)__UNCONST(data), 1); 392 if (ret == 1) { 393 break; 394 } else if (retry < 4) { 395 mdelay(50); 396 continue; 397 } else { 398 DRM_ERROR("DPCD write failed at:0x%x\n", reg); 399 return false; 400 } 401 } 402 val++; reg++; data++; 403 } 404 405 val = 0; 406 reg = LSPCON_MCA_AVI_IF_CTRL; 407 ret = drm_dp_dpcd_read(aux, reg, &val, 1); 408 if (ret < 0) { 409 DRM_ERROR("DPCD read failed, address 0x%x\n", reg); 410 return false; 411 } 412 413 /* Indicate LSPCON chip about infoframe, clear bit 1 and set bit 0 */ 414 val &= ~LSPCON_MCA_AVI_IF_HANDLED; 415 val |= LSPCON_MCA_AVI_IF_KICKOFF; 416 417 ret = drm_dp_dpcd_write(aux, reg, &val, 1); 418 if (ret < 0) { 419 DRM_ERROR("DPCD read failed, address 0x%x\n", reg); 420 return false; 421 } 422 423 val = 0; 424 ret = drm_dp_dpcd_read(aux, reg, &val, 1); 425 if (ret < 0) { 426 DRM_ERROR("DPCD read failed, address 0x%x\n", reg); 427 return false; 428 } 429 430 if (val == LSPCON_MCA_AVI_IF_HANDLED) 431 DRM_DEBUG_KMS("AVI IF handled by FW\n"); 432 433 return true; 434} 435 436void lspcon_write_infoframe(struct intel_encoder *encoder, 437 const struct intel_crtc_state *crtc_state, 438 unsigned int type, 439 const void *frame, ssize_t len) 440{ 441 bool ret; 442 struct intel_dp *intel_dp = enc_to_intel_dp(encoder); 443 struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder); 444 445 /* LSPCON only needs AVI IF */ 446 if (type != HDMI_INFOFRAME_TYPE_AVI) 447 return; 448 449 if (lspcon->vendor == LSPCON_VENDOR_MCA) 450 ret = _lspcon_write_avi_infoframe_mca(&intel_dp->aux, 451 frame, len); 452 else 453 ret = _lspcon_write_avi_infoframe_parade(&intel_dp->aux, 454 frame, len); 455 456 if (!ret) { 457 DRM_ERROR("Failed to write AVI infoframes\n"); 458 return; 459 } 460 461 DRM_DEBUG_DRIVER("AVI infoframes updated successfully\n"); 462} 463 464void lspcon_read_infoframe(struct intel_encoder *encoder, 465 const struct intel_crtc_state *crtc_state, 466 unsigned int type, 467 void *frame, ssize_t len) 468{ 469 /* FIXME implement this */ 470} 471 472void lspcon_set_infoframes(struct intel_encoder *encoder, 473 bool enable, 474 const struct intel_crtc_state *crtc_state, 475 const struct drm_connector_state *conn_state) 476{ 477 ssize_t ret; 478 union hdmi_infoframe frame; 479 u8 buf[VIDEO_DIP_DATA_SIZE]; 480 struct intel_digital_port *dig_port = enc_to_dig_port(encoder); 481 struct intel_lspcon *lspcon = &dig_port->lspcon; 482 const struct drm_display_mode *adjusted_mode = 483 &crtc_state->hw.adjusted_mode; 484 485 if (!lspcon->active) { 486 DRM_ERROR("Writing infoframes while LSPCON disabled ?\n"); 487 return; 488 } 489 490 /* FIXME precompute infoframes */ 491 492 ret = drm_hdmi_avi_infoframe_from_display_mode(&frame.avi, 493 conn_state->connector, 494 adjusted_mode); 495 if (ret < 0) { 496 DRM_ERROR("couldn't fill AVI infoframe\n"); 497 return; 498 } 499 500 if (crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444) { 501 if (crtc_state->lspcon_downsampling) 502 frame.avi.colorspace = HDMI_COLORSPACE_YUV420; 503 else 504 frame.avi.colorspace = HDMI_COLORSPACE_YUV444; 505 } else { 506 frame.avi.colorspace = HDMI_COLORSPACE_RGB; 507 } 508 509 drm_hdmi_avi_infoframe_quant_range(&frame.avi, 510 conn_state->connector, 511 adjusted_mode, 512 crtc_state->limited_color_range ? 513 HDMI_QUANTIZATION_RANGE_LIMITED : 514 HDMI_QUANTIZATION_RANGE_FULL); 515 516 ret = hdmi_infoframe_pack(&frame, buf, sizeof(buf)); 517 if (ret < 0) { 518 DRM_ERROR("Failed to pack AVI IF\n"); 519 return; 520 } 521 522 dig_port->write_infoframe(encoder, crtc_state, HDMI_INFOFRAME_TYPE_AVI, 523 buf, ret); 524} 525 526u32 lspcon_infoframes_enabled(struct intel_encoder *encoder, 527 const struct intel_crtc_state *pipe_config) 528{ 529 /* FIXME actually read this from the hw */ 530 return enc_to_intel_lspcon(encoder)->active; 531} 532 533void lspcon_resume(struct intel_lspcon *lspcon) 534{ 535 enum drm_lspcon_mode expected_mode; 536 537 if (lspcon_wake_native_aux_ch(lspcon)) { 538 expected_mode = DRM_LSPCON_MODE_PCON; 539 lspcon_resume_in_pcon_wa(lspcon); 540 } else { 541 expected_mode = DRM_LSPCON_MODE_LS; 542 } 543 544 if (lspcon_wait_mode(lspcon, expected_mode) == DRM_LSPCON_MODE_PCON) 545 return; 546 547 if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON)) 548 DRM_ERROR("LSPCON resume failed\n"); 549 else 550 DRM_DEBUG_KMS("LSPCON resume success\n"); 551} 552 553void lspcon_wait_pcon_mode(struct intel_lspcon *lspcon) 554{ 555 lspcon_wait_mode(lspcon, DRM_LSPCON_MODE_PCON); 556} 557 558bool lspcon_init(struct intel_digital_port *intel_dig_port) 559{ 560 struct intel_dp *dp = &intel_dig_port->dp; 561 struct intel_lspcon *lspcon = &intel_dig_port->lspcon; 562 struct drm_device *dev = intel_dig_port->base.base.dev; 563 struct drm_i915_private *dev_priv = to_i915(dev); 564 struct drm_connector *connector = &dp->attached_connector->base; 565 566 if (!HAS_LSPCON(dev_priv)) { 567 DRM_ERROR("LSPCON is not supported on this platform\n"); 568 return false; 569 } 570 571 lspcon->active = false; 572 lspcon->mode = DRM_LSPCON_MODE_INVALID; 573 574 if (!lspcon_probe(lspcon)) { 575 DRM_ERROR("Failed to probe lspcon\n"); 576 return false; 577 } 578 579 if (!intel_dp_read_dpcd(dp)) { 580 DRM_ERROR("LSPCON DPCD read failed\n"); 581 return false; 582 } 583 584 if (!lspcon_detect_vendor(lspcon)) { 585 DRM_ERROR("LSPCON vendor detection failed\n"); 586 return false; 587 } 588 589 connector->ycbcr_420_allowed = true; 590 lspcon->active = true; 591 DRM_DEBUG_KMS("Success: LSPCON init\n"); 592 return true; 593} 594