1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Cadence MHDP8546 DP bridge driver. 4 * 5 * Copyright (C) 2020 Cadence Design Systems, Inc. 6 * 7 * Authors: Quentin Schulz <quentin.schulz@free-electrons.com> 8 * Swapnil Jakhade <sjakhade@cadence.com> 9 * Yuti Amonkar <yamonkar@cadence.com> 10 * Tomi Valkeinen <tomi.valkeinen@ti.com> 11 * Jyri Sarha <jsarha@ti.com> 12 * 13 * TODO: 14 * - Implement optimized mailbox communication using mailbox interrupts 15 * - Add support for power management 16 * - Add support for features like audio, MST and fast link training 17 * - Implement request_fw_cancel to handle HW_STATE 18 * - Fix asynchronous loading of firmware implementation 19 * - Add DRM helper function for cdns_mhdp_lower_link_rate 20 */ 21 22#include <linux/clk.h> 23#include <linux/delay.h> 24#include <linux/err.h> 25#include <linux/firmware.h> 26#include <linux/io.h> 27#include <linux/iopoll.h> 28#include <linux/irq.h> 29#include <linux/media-bus-format.h> 30#include <linux/module.h> 31#include <linux/of.h> 32#include <linux/phy/phy.h> 33#include <linux/phy/phy-dp.h> 34#include <linux/platform_device.h> 35#include <linux/slab.h> 36#include <linux/wait.h> 37 38#include <drm/display/drm_dp_helper.h> 39#include <drm/display/drm_hdcp_helper.h> 40#include <drm/drm_atomic.h> 41#include <drm/drm_atomic_helper.h> 42#include <drm/drm_atomic_state_helper.h> 43#include <drm/drm_bridge.h> 44#include <drm/drm_connector.h> 45#include <drm/drm_edid.h> 46#include <drm/drm_modeset_helper_vtables.h> 47#include <drm/drm_print.h> 48#include <drm/drm_probe_helper.h> 49 50#include <asm/unaligned.h> 51 52#include "cdns-mhdp8546-core.h" 53#include "cdns-mhdp8546-hdcp.h" 54#include "cdns-mhdp8546-j721e.h" 55 56static void cdns_mhdp_bridge_hpd_enable(struct drm_bridge *bridge) 57{ 58 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 59 60 /* Enable SW event interrupts */ 61 if (mhdp->bridge_attached) 62 writel(readl(mhdp->regs + CDNS_APB_INT_MASK) & 63 ~CDNS_APB_INT_MASK_SW_EVENT_INT, 64 mhdp->regs + CDNS_APB_INT_MASK); 65} 66 67static void cdns_mhdp_bridge_hpd_disable(struct drm_bridge *bridge) 68{ 69 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 70 71 writel(readl(mhdp->regs + CDNS_APB_INT_MASK) | 72 CDNS_APB_INT_MASK_SW_EVENT_INT, 73 mhdp->regs + CDNS_APB_INT_MASK); 74} 75 76static int cdns_mhdp_mailbox_read(struct cdns_mhdp_device *mhdp) 77{ 78 int ret, empty; 79 80 WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex)); 81 82 ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_EMPTY, 83 empty, !empty, MAILBOX_RETRY_US, 84 MAILBOX_TIMEOUT_US); 85 if (ret < 0) 86 return ret; 87 88 return readl(mhdp->regs + CDNS_MAILBOX_RX_DATA) & 0xff; 89} 90 91static int cdns_mhdp_mailbox_write(struct cdns_mhdp_device *mhdp, u8 val) 92{ 93 int ret, full; 94 95 WARN_ON(!mutex_is_locked(&mhdp->mbox_mutex)); 96 97 ret = readx_poll_timeout(readl, mhdp->regs + CDNS_MAILBOX_FULL, 98 full, !full, MAILBOX_RETRY_US, 99 MAILBOX_TIMEOUT_US); 100 if (ret < 0) 101 return ret; 102 103 writel(val, mhdp->regs + CDNS_MAILBOX_TX_DATA); 104 105 return 0; 106} 107 108static int cdns_mhdp_mailbox_recv_header(struct cdns_mhdp_device *mhdp, 109 u8 module_id, u8 opcode, 110 u16 req_size) 111{ 112 u32 mbox_size, i; 113 u8 header[4]; 114 int ret; 115 116 /* read the header of the message */ 117 for (i = 0; i < sizeof(header); i++) { 118 ret = cdns_mhdp_mailbox_read(mhdp); 119 if (ret < 0) 120 return ret; 121 122 header[i] = ret; 123 } 124 125 mbox_size = get_unaligned_be16(header + 2); 126 127 if (opcode != header[0] || module_id != header[1] || 128 req_size != mbox_size) { 129 /* 130 * If the message in mailbox is not what we want, we need to 131 * clear the mailbox by reading its contents. 132 */ 133 for (i = 0; i < mbox_size; i++) 134 if (cdns_mhdp_mailbox_read(mhdp) < 0) 135 break; 136 137 return -EINVAL; 138 } 139 140 return 0; 141} 142 143static int cdns_mhdp_mailbox_recv_data(struct cdns_mhdp_device *mhdp, 144 u8 *buff, u16 buff_size) 145{ 146 u32 i; 147 int ret; 148 149 for (i = 0; i < buff_size; i++) { 150 ret = cdns_mhdp_mailbox_read(mhdp); 151 if (ret < 0) 152 return ret; 153 154 buff[i] = ret; 155 } 156 157 return 0; 158} 159 160static int cdns_mhdp_mailbox_send(struct cdns_mhdp_device *mhdp, u8 module_id, 161 u8 opcode, u16 size, u8 *message) 162{ 163 u8 header[4]; 164 int ret, i; 165 166 header[0] = opcode; 167 header[1] = module_id; 168 put_unaligned_be16(size, header + 2); 169 170 for (i = 0; i < sizeof(header); i++) { 171 ret = cdns_mhdp_mailbox_write(mhdp, header[i]); 172 if (ret) 173 return ret; 174 } 175 176 for (i = 0; i < size; i++) { 177 ret = cdns_mhdp_mailbox_write(mhdp, message[i]); 178 if (ret) 179 return ret; 180 } 181 182 return 0; 183} 184 185static 186int cdns_mhdp_reg_read(struct cdns_mhdp_device *mhdp, u32 addr, u32 *value) 187{ 188 u8 msg[4], resp[8]; 189 int ret; 190 191 put_unaligned_be32(addr, msg); 192 193 mutex_lock(&mhdp->mbox_mutex); 194 195 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_GENERAL, 196 GENERAL_REGISTER_READ, 197 sizeof(msg), msg); 198 if (ret) 199 goto out; 200 201 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_GENERAL, 202 GENERAL_REGISTER_READ, 203 sizeof(resp)); 204 if (ret) 205 goto out; 206 207 ret = cdns_mhdp_mailbox_recv_data(mhdp, resp, sizeof(resp)); 208 if (ret) 209 goto out; 210 211 /* Returned address value should be the same as requested */ 212 if (memcmp(msg, resp, sizeof(msg))) { 213 ret = -EINVAL; 214 goto out; 215 } 216 217 *value = get_unaligned_be32(resp + 4); 218 219out: 220 mutex_unlock(&mhdp->mbox_mutex); 221 if (ret) { 222 dev_err(mhdp->dev, "Failed to read register\n"); 223 *value = 0; 224 } 225 226 return ret; 227} 228 229static 230int cdns_mhdp_reg_write(struct cdns_mhdp_device *mhdp, u16 addr, u32 val) 231{ 232 u8 msg[6]; 233 int ret; 234 235 put_unaligned_be16(addr, msg); 236 put_unaligned_be32(val, msg + 2); 237 238 mutex_lock(&mhdp->mbox_mutex); 239 240 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 241 DPTX_WRITE_REGISTER, sizeof(msg), msg); 242 243 mutex_unlock(&mhdp->mbox_mutex); 244 245 return ret; 246} 247 248static 249int cdns_mhdp_reg_write_bit(struct cdns_mhdp_device *mhdp, u16 addr, 250 u8 start_bit, u8 bits_no, u32 val) 251{ 252 u8 field[8]; 253 int ret; 254 255 put_unaligned_be16(addr, field); 256 field[2] = start_bit; 257 field[3] = bits_no; 258 put_unaligned_be32(val, field + 4); 259 260 mutex_lock(&mhdp->mbox_mutex); 261 262 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 263 DPTX_WRITE_FIELD, sizeof(field), field); 264 265 mutex_unlock(&mhdp->mbox_mutex); 266 267 return ret; 268} 269 270static 271int cdns_mhdp_dpcd_read(struct cdns_mhdp_device *mhdp, 272 u32 addr, u8 *data, u16 len) 273{ 274 u8 msg[5], reg[5]; 275 int ret; 276 277 put_unaligned_be16(len, msg); 278 put_unaligned_be24(addr, msg + 2); 279 280 mutex_lock(&mhdp->mbox_mutex); 281 282 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 283 DPTX_READ_DPCD, sizeof(msg), msg); 284 if (ret) 285 goto out; 286 287 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, 288 DPTX_READ_DPCD, 289 sizeof(reg) + len); 290 if (ret) 291 goto out; 292 293 ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg)); 294 if (ret) 295 goto out; 296 297 ret = cdns_mhdp_mailbox_recv_data(mhdp, data, len); 298 299out: 300 mutex_unlock(&mhdp->mbox_mutex); 301 302 return ret; 303} 304 305static 306int cdns_mhdp_dpcd_write(struct cdns_mhdp_device *mhdp, u32 addr, u8 value) 307{ 308 u8 msg[6], reg[5]; 309 int ret; 310 311 put_unaligned_be16(1, msg); 312 put_unaligned_be24(addr, msg + 2); 313 msg[5] = value; 314 315 mutex_lock(&mhdp->mbox_mutex); 316 317 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 318 DPTX_WRITE_DPCD, sizeof(msg), msg); 319 if (ret) 320 goto out; 321 322 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, 323 DPTX_WRITE_DPCD, sizeof(reg)); 324 if (ret) 325 goto out; 326 327 ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg)); 328 if (ret) 329 goto out; 330 331 if (addr != get_unaligned_be24(reg + 2)) 332 ret = -EINVAL; 333 334out: 335 mutex_unlock(&mhdp->mbox_mutex); 336 337 if (ret) 338 dev_err(mhdp->dev, "dpcd write failed: %d\n", ret); 339 return ret; 340} 341 342static 343int cdns_mhdp_set_firmware_active(struct cdns_mhdp_device *mhdp, bool enable) 344{ 345 u8 msg[5]; 346 int ret, i; 347 348 msg[0] = GENERAL_MAIN_CONTROL; 349 msg[1] = MB_MODULE_ID_GENERAL; 350 msg[2] = 0; 351 msg[3] = 1; 352 msg[4] = enable ? FW_ACTIVE : FW_STANDBY; 353 354 mutex_lock(&mhdp->mbox_mutex); 355 356 for (i = 0; i < sizeof(msg); i++) { 357 ret = cdns_mhdp_mailbox_write(mhdp, msg[i]); 358 if (ret) 359 goto out; 360 } 361 362 /* read the firmware state */ 363 ret = cdns_mhdp_mailbox_recv_data(mhdp, msg, sizeof(msg)); 364 if (ret) 365 goto out; 366 367 ret = 0; 368 369out: 370 mutex_unlock(&mhdp->mbox_mutex); 371 372 if (ret < 0) 373 dev_err(mhdp->dev, "set firmware active failed\n"); 374 return ret; 375} 376 377static 378int cdns_mhdp_get_hpd_status(struct cdns_mhdp_device *mhdp) 379{ 380 u8 status; 381 int ret; 382 383 mutex_lock(&mhdp->mbox_mutex); 384 385 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 386 DPTX_HPD_STATE, 0, NULL); 387 if (ret) 388 goto err_get_hpd; 389 390 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, 391 DPTX_HPD_STATE, 392 sizeof(status)); 393 if (ret) 394 goto err_get_hpd; 395 396 ret = cdns_mhdp_mailbox_recv_data(mhdp, &status, sizeof(status)); 397 if (ret) 398 goto err_get_hpd; 399 400 mutex_unlock(&mhdp->mbox_mutex); 401 402 dev_dbg(mhdp->dev, "%s: HPD %splugged\n", __func__, 403 status ? "" : "un"); 404 405 return status; 406 407err_get_hpd: 408 mutex_unlock(&mhdp->mbox_mutex); 409 410 return ret; 411} 412 413static 414int cdns_mhdp_get_edid_block(void *data, u8 *edid, 415 unsigned int block, size_t length) 416{ 417 struct cdns_mhdp_device *mhdp = data; 418 u8 msg[2], reg[2], i; 419 int ret; 420 421 mutex_lock(&mhdp->mbox_mutex); 422 423 for (i = 0; i < 4; i++) { 424 msg[0] = block / 2; 425 msg[1] = block % 2; 426 427 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 428 DPTX_GET_EDID, sizeof(msg), msg); 429 if (ret) 430 continue; 431 432 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, 433 DPTX_GET_EDID, 434 sizeof(reg) + length); 435 if (ret) 436 continue; 437 438 ret = cdns_mhdp_mailbox_recv_data(mhdp, reg, sizeof(reg)); 439 if (ret) 440 continue; 441 442 ret = cdns_mhdp_mailbox_recv_data(mhdp, edid, length); 443 if (ret) 444 continue; 445 446 if (reg[0] == length && reg[1] == block / 2) 447 break; 448 } 449 450 mutex_unlock(&mhdp->mbox_mutex); 451 452 if (ret) 453 dev_err(mhdp->dev, "get block[%d] edid failed: %d\n", 454 block, ret); 455 456 return ret; 457} 458 459static 460int cdns_mhdp_read_hpd_event(struct cdns_mhdp_device *mhdp) 461{ 462 u8 event = 0; 463 int ret; 464 465 mutex_lock(&mhdp->mbox_mutex); 466 467 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 468 DPTX_READ_EVENT, 0, NULL); 469 if (ret) 470 goto out; 471 472 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, 473 DPTX_READ_EVENT, sizeof(event)); 474 if (ret < 0) 475 goto out; 476 477 ret = cdns_mhdp_mailbox_recv_data(mhdp, &event, sizeof(event)); 478out: 479 mutex_unlock(&mhdp->mbox_mutex); 480 481 if (ret < 0) 482 return ret; 483 484 dev_dbg(mhdp->dev, "%s: %s%s%s%s\n", __func__, 485 (event & DPTX_READ_EVENT_HPD_TO_HIGH) ? "TO_HIGH " : "", 486 (event & DPTX_READ_EVENT_HPD_TO_LOW) ? "TO_LOW " : "", 487 (event & DPTX_READ_EVENT_HPD_PULSE) ? "PULSE " : "", 488 (event & DPTX_READ_EVENT_HPD_STATE) ? "HPD_STATE " : ""); 489 490 return event; 491} 492 493static 494int cdns_mhdp_adjust_lt(struct cdns_mhdp_device *mhdp, unsigned int nlanes, 495 unsigned int udelay, const u8 *lanes_data, 496 u8 link_status[DP_LINK_STATUS_SIZE]) 497{ 498 u8 payload[7]; 499 u8 hdr[5]; /* For DPCD read response header */ 500 u32 addr; 501 int ret; 502 503 if (nlanes != 4 && nlanes != 2 && nlanes != 1) { 504 dev_err(mhdp->dev, "invalid number of lanes: %u\n", nlanes); 505 ret = -EINVAL; 506 goto out; 507 } 508 509 payload[0] = nlanes; 510 put_unaligned_be16(udelay, payload + 1); 511 memcpy(payload + 3, lanes_data, nlanes); 512 513 mutex_lock(&mhdp->mbox_mutex); 514 515 ret = cdns_mhdp_mailbox_send(mhdp, MB_MODULE_ID_DP_TX, 516 DPTX_ADJUST_LT, 517 sizeof(payload), payload); 518 if (ret) 519 goto out; 520 521 /* Yes, read the DPCD read command response */ 522 ret = cdns_mhdp_mailbox_recv_header(mhdp, MB_MODULE_ID_DP_TX, 523 DPTX_READ_DPCD, 524 sizeof(hdr) + DP_LINK_STATUS_SIZE); 525 if (ret) 526 goto out; 527 528 ret = cdns_mhdp_mailbox_recv_data(mhdp, hdr, sizeof(hdr)); 529 if (ret) 530 goto out; 531 532 addr = get_unaligned_be24(hdr + 2); 533 if (addr != DP_LANE0_1_STATUS) 534 goto out; 535 536 ret = cdns_mhdp_mailbox_recv_data(mhdp, link_status, 537 DP_LINK_STATUS_SIZE); 538 539out: 540 mutex_unlock(&mhdp->mbox_mutex); 541 542 if (ret) 543 dev_err(mhdp->dev, "Failed to adjust Link Training.\n"); 544 545 return ret; 546} 547 548/** 549 * cdns_mhdp_link_power_up() - power up a DisplayPort link 550 * @aux: DisplayPort AUX channel 551 * @link: pointer to a structure containing the link configuration 552 * 553 * Returns 0 on success or a negative error code on failure. 554 */ 555static 556int cdns_mhdp_link_power_up(struct drm_dp_aux *aux, struct cdns_mhdp_link *link) 557{ 558 u8 value; 559 int err; 560 561 /* DP_SET_POWER register is only available on DPCD v1.1 and later */ 562 if (link->revision < 0x11) 563 return 0; 564 565 err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); 566 if (err < 0) 567 return err; 568 569 value &= ~DP_SET_POWER_MASK; 570 value |= DP_SET_POWER_D0; 571 572 err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); 573 if (err < 0) 574 return err; 575 576 /* 577 * According to the DP 1.1 specification, a "Sink Device must exit the 578 * power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink 579 * Control Field" (register 0x600). 580 */ 581 usleep_range(1000, 2000); 582 583 return 0; 584} 585 586/** 587 * cdns_mhdp_link_power_down() - power down a DisplayPort link 588 * @aux: DisplayPort AUX channel 589 * @link: pointer to a structure containing the link configuration 590 * 591 * Returns 0 on success or a negative error code on failure. 592 */ 593static 594int cdns_mhdp_link_power_down(struct drm_dp_aux *aux, 595 struct cdns_mhdp_link *link) 596{ 597 u8 value; 598 int err; 599 600 /* DP_SET_POWER register is only available on DPCD v1.1 and later */ 601 if (link->revision < 0x11) 602 return 0; 603 604 err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value); 605 if (err < 0) 606 return err; 607 608 value &= ~DP_SET_POWER_MASK; 609 value |= DP_SET_POWER_D3; 610 611 err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); 612 if (err < 0) 613 return err; 614 615 return 0; 616} 617 618/** 619 * cdns_mhdp_link_configure() - configure a DisplayPort link 620 * @aux: DisplayPort AUX channel 621 * @link: pointer to a structure containing the link configuration 622 * 623 * Returns 0 on success or a negative error code on failure. 624 */ 625static 626int cdns_mhdp_link_configure(struct drm_dp_aux *aux, 627 struct cdns_mhdp_link *link) 628{ 629 u8 values[2]; 630 int err; 631 632 values[0] = drm_dp_link_rate_to_bw_code(link->rate); 633 values[1] = link->num_lanes; 634 635 if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING) 636 values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; 637 638 err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values)); 639 if (err < 0) 640 return err; 641 642 return 0; 643} 644 645static unsigned int cdns_mhdp_max_link_rate(struct cdns_mhdp_device *mhdp) 646{ 647 return min(mhdp->host.link_rate, mhdp->sink.link_rate); 648} 649 650static u8 cdns_mhdp_max_num_lanes(struct cdns_mhdp_device *mhdp) 651{ 652 return min(mhdp->sink.lanes_cnt, mhdp->host.lanes_cnt); 653} 654 655static u8 cdns_mhdp_eq_training_pattern_supported(struct cdns_mhdp_device *mhdp) 656{ 657 return fls(mhdp->host.pattern_supp & mhdp->sink.pattern_supp); 658} 659 660static bool cdns_mhdp_get_ssc_supported(struct cdns_mhdp_device *mhdp) 661{ 662 /* Check if SSC is supported by both sides */ 663 return mhdp->host.ssc && mhdp->sink.ssc; 664} 665 666static enum drm_connector_status cdns_mhdp_detect(struct cdns_mhdp_device *mhdp) 667{ 668 dev_dbg(mhdp->dev, "%s: %d\n", __func__, mhdp->plugged); 669 670 if (mhdp->plugged) 671 return connector_status_connected; 672 else 673 return connector_status_disconnected; 674} 675 676static int cdns_mhdp_check_fw_version(struct cdns_mhdp_device *mhdp) 677{ 678 u32 major_num, minor_num, revision; 679 u32 fw_ver, lib_ver; 680 681 fw_ver = (readl(mhdp->regs + CDNS_VER_H) << 8) 682 | readl(mhdp->regs + CDNS_VER_L); 683 684 lib_ver = (readl(mhdp->regs + CDNS_LIB_H_ADDR) << 8) 685 | readl(mhdp->regs + CDNS_LIB_L_ADDR); 686 687 if (lib_ver < 33984) { 688 /* 689 * Older FW versions with major number 1, used to store FW 690 * version information by storing repository revision number 691 * in registers. This is for identifying these FW versions. 692 */ 693 major_num = 1; 694 minor_num = 2; 695 if (fw_ver == 26098) { 696 revision = 15; 697 } else if (lib_ver == 0 && fw_ver == 0) { 698 revision = 17; 699 } else { 700 dev_err(mhdp->dev, "Unsupported FW version: fw_ver = %u, lib_ver = %u\n", 701 fw_ver, lib_ver); 702 return -ENODEV; 703 } 704 } else { 705 /* To identify newer FW versions with major number 2 onwards. */ 706 major_num = fw_ver / 10000; 707 minor_num = (fw_ver / 100) % 100; 708 revision = (fw_ver % 10000) % 100; 709 } 710 711 dev_dbg(mhdp->dev, "FW version: v%u.%u.%u\n", major_num, minor_num, 712 revision); 713 return 0; 714} 715 716static int cdns_mhdp_fw_activate(const struct firmware *fw, 717 struct cdns_mhdp_device *mhdp) 718{ 719 unsigned int reg; 720 int ret; 721 722 /* Release uCPU reset and stall it. */ 723 writel(CDNS_CPU_STALL, mhdp->regs + CDNS_APB_CTRL); 724 725 memcpy_toio(mhdp->regs + CDNS_MHDP_IMEM, fw->data, fw->size); 726 727 /* Leave debug mode, release stall */ 728 writel(0, mhdp->regs + CDNS_APB_CTRL); 729 730 /* 731 * Wait for the KEEP_ALIVE "message" on the first 8 bits. 732 * Updated each sched "tick" (~2ms) 733 */ 734 ret = readl_poll_timeout(mhdp->regs + CDNS_KEEP_ALIVE, reg, 735 reg & CDNS_KEEP_ALIVE_MASK, 500, 736 CDNS_KEEP_ALIVE_TIMEOUT); 737 if (ret) { 738 dev_err(mhdp->dev, 739 "device didn't give any life sign: reg %d\n", reg); 740 return ret; 741 } 742 743 ret = cdns_mhdp_check_fw_version(mhdp); 744 if (ret) 745 return ret; 746 747 /* Init events to 0 as it's not cleared by FW at boot but on read */ 748 readl(mhdp->regs + CDNS_SW_EVENT0); 749 readl(mhdp->regs + CDNS_SW_EVENT1); 750 readl(mhdp->regs + CDNS_SW_EVENT2); 751 readl(mhdp->regs + CDNS_SW_EVENT3); 752 753 /* Activate uCPU */ 754 ret = cdns_mhdp_set_firmware_active(mhdp, true); 755 if (ret) 756 return ret; 757 758 spin_lock(&mhdp->start_lock); 759 760 mhdp->hw_state = MHDP_HW_READY; 761 762 /* 763 * Here we must keep the lock while enabling the interrupts 764 * since it would otherwise be possible that interrupt enable 765 * code is executed after the bridge is detached. The similar 766 * situation is not possible in attach()/detach() callbacks 767 * since the hw_state changes from MHDP_HW_READY to 768 * MHDP_HW_STOPPED happens only due to driver removal when 769 * bridge should already be detached. 770 */ 771 cdns_mhdp_bridge_hpd_enable(&mhdp->bridge); 772 773 spin_unlock(&mhdp->start_lock); 774 775 wake_up(&mhdp->fw_load_wq); 776 dev_dbg(mhdp->dev, "DP FW activated\n"); 777 778 return 0; 779} 780 781static void cdns_mhdp_fw_cb(const struct firmware *fw, void *context) 782{ 783 struct cdns_mhdp_device *mhdp = context; 784 bool bridge_attached; 785 int ret; 786 787 dev_dbg(mhdp->dev, "firmware callback\n"); 788 789 if (!fw || !fw->data) { 790 dev_err(mhdp->dev, "%s: No firmware.\n", __func__); 791 return; 792 } 793 794 ret = cdns_mhdp_fw_activate(fw, mhdp); 795 796 release_firmware(fw); 797 798 if (ret) 799 return; 800 801 /* 802 * XXX how to make sure the bridge is still attached when 803 * calling drm_kms_helper_hotplug_event() after releasing 804 * the lock? We should not hold the spin lock when 805 * calling drm_kms_helper_hotplug_event() since it may 806 * cause a dead lock. FB-dev console calls detect from the 807 * same thread just down the call stack started here. 808 */ 809 spin_lock(&mhdp->start_lock); 810 bridge_attached = mhdp->bridge_attached; 811 spin_unlock(&mhdp->start_lock); 812 if (bridge_attached) { 813 if (mhdp->connector.dev) 814 drm_kms_helper_hotplug_event(mhdp->bridge.dev); 815 else 816 drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp)); 817 } 818} 819 820static int cdns_mhdp_load_firmware(struct cdns_mhdp_device *mhdp) 821{ 822 int ret; 823 824 ret = request_firmware_nowait(THIS_MODULE, true, FW_NAME, mhdp->dev, 825 GFP_KERNEL, mhdp, cdns_mhdp_fw_cb); 826 if (ret) { 827 dev_err(mhdp->dev, "failed to load firmware (%s), ret: %d\n", 828 FW_NAME, ret); 829 return ret; 830 } 831 832 return 0; 833} 834 835static ssize_t cdns_mhdp_transfer(struct drm_dp_aux *aux, 836 struct drm_dp_aux_msg *msg) 837{ 838 struct cdns_mhdp_device *mhdp = dev_get_drvdata(aux->dev); 839 int ret; 840 841 if (msg->request != DP_AUX_NATIVE_WRITE && 842 msg->request != DP_AUX_NATIVE_READ) 843 return -EOPNOTSUPP; 844 845 if (msg->request == DP_AUX_NATIVE_WRITE) { 846 const u8 *buf = msg->buffer; 847 unsigned int i; 848 849 for (i = 0; i < msg->size; ++i) { 850 ret = cdns_mhdp_dpcd_write(mhdp, 851 msg->address + i, buf[i]); 852 if (!ret) 853 continue; 854 855 dev_err(mhdp->dev, 856 "Failed to write DPCD addr %u\n", 857 msg->address + i); 858 859 return ret; 860 } 861 } else { 862 ret = cdns_mhdp_dpcd_read(mhdp, msg->address, 863 msg->buffer, msg->size); 864 if (ret) { 865 dev_err(mhdp->dev, 866 "Failed to read DPCD addr %u\n", 867 msg->address); 868 869 return ret; 870 } 871 } 872 873 return msg->size; 874} 875 876static int cdns_mhdp_link_training_init(struct cdns_mhdp_device *mhdp) 877{ 878 union phy_configure_opts phy_cfg; 879 u32 reg32; 880 int ret; 881 882 drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, 883 DP_TRAINING_PATTERN_DISABLE); 884 885 /* Reset PHY configuration */ 886 reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); 887 if (!mhdp->host.scrambler) 888 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; 889 890 cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); 891 892 cdns_mhdp_reg_write(mhdp, CDNS_DP_ENHNCD, 893 mhdp->sink.enhanced & mhdp->host.enhanced); 894 895 cdns_mhdp_reg_write(mhdp, CDNS_DP_LANE_EN, 896 CDNS_DP_LANE_EN_LANES(mhdp->link.num_lanes)); 897 898 cdns_mhdp_link_configure(&mhdp->aux, &mhdp->link); 899 phy_cfg.dp.link_rate = mhdp->link.rate / 100; 900 phy_cfg.dp.lanes = mhdp->link.num_lanes; 901 902 memset(phy_cfg.dp.voltage, 0, sizeof(phy_cfg.dp.voltage)); 903 memset(phy_cfg.dp.pre, 0, sizeof(phy_cfg.dp.pre)); 904 905 phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp); 906 phy_cfg.dp.set_lanes = true; 907 phy_cfg.dp.set_rate = true; 908 phy_cfg.dp.set_voltages = true; 909 ret = phy_configure(mhdp->phy, &phy_cfg); 910 if (ret) { 911 dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n", 912 __func__, ret); 913 return ret; 914 } 915 916 cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, 917 CDNS_PHY_COMMON_CONFIG | 918 CDNS_PHY_TRAINING_EN | 919 CDNS_PHY_TRAINING_TYPE(1) | 920 CDNS_PHY_SCRAMBLER_BYPASS); 921 922 drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, 923 DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE); 924 925 return 0; 926} 927 928static void cdns_mhdp_get_adjust_train(struct cdns_mhdp_device *mhdp, 929 u8 link_status[DP_LINK_STATUS_SIZE], 930 u8 lanes_data[CDNS_DP_MAX_NUM_LANES], 931 union phy_configure_opts *phy_cfg) 932{ 933 u8 adjust, max_pre_emph, max_volt_swing; 934 u8 set_volt, set_pre; 935 unsigned int i; 936 937 max_pre_emph = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis) 938 << DP_TRAIN_PRE_EMPHASIS_SHIFT; 939 max_volt_swing = CDNS_VOLT_SWING(mhdp->host.volt_swing); 940 941 for (i = 0; i < mhdp->link.num_lanes; i++) { 942 /* Check if Voltage swing and pre-emphasis are within limits */ 943 adjust = drm_dp_get_adjust_request_voltage(link_status, i); 944 set_volt = min(adjust, max_volt_swing); 945 946 adjust = drm_dp_get_adjust_request_pre_emphasis(link_status, i); 947 set_pre = min(adjust, max_pre_emph) 948 >> DP_TRAIN_PRE_EMPHASIS_SHIFT; 949 950 /* 951 * Voltage swing level and pre-emphasis level combination is 952 * not allowed: leaving pre-emphasis as-is, and adjusting 953 * voltage swing. 954 */ 955 if (set_volt + set_pre > 3) 956 set_volt = 3 - set_pre; 957 958 phy_cfg->dp.voltage[i] = set_volt; 959 lanes_data[i] = set_volt; 960 961 if (set_volt == max_volt_swing) 962 lanes_data[i] |= DP_TRAIN_MAX_SWING_REACHED; 963 964 phy_cfg->dp.pre[i] = set_pre; 965 lanes_data[i] |= (set_pre << DP_TRAIN_PRE_EMPHASIS_SHIFT); 966 967 if (set_pre == (max_pre_emph >> DP_TRAIN_PRE_EMPHASIS_SHIFT)) 968 lanes_data[i] |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; 969 } 970} 971 972static 973void cdns_mhdp_set_adjust_request_voltage(u8 link_status[DP_LINK_STATUS_SIZE], 974 unsigned int lane, u8 volt) 975{ 976 unsigned int s = ((lane & 1) ? 977 DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : 978 DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); 979 unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1); 980 981 link_status[idx] &= ~(DP_ADJUST_VOLTAGE_SWING_LANE0_MASK << s); 982 link_status[idx] |= volt << s; 983} 984 985static 986void cdns_mhdp_set_adjust_request_pre_emphasis(u8 link_status[DP_LINK_STATUS_SIZE], 987 unsigned int lane, u8 pre_emphasis) 988{ 989 unsigned int s = ((lane & 1) ? 990 DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : 991 DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); 992 unsigned int idx = DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS + (lane >> 1); 993 994 link_status[idx] &= ~(DP_ADJUST_PRE_EMPHASIS_LANE0_MASK << s); 995 link_status[idx] |= pre_emphasis << s; 996} 997 998static void cdns_mhdp_adjust_requested_eq(struct cdns_mhdp_device *mhdp, 999 u8 link_status[DP_LINK_STATUS_SIZE]) 1000{ 1001 u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); 1002 u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing); 1003 unsigned int i; 1004 u8 volt, pre; 1005 1006 for (i = 0; i < mhdp->link.num_lanes; i++) { 1007 volt = drm_dp_get_adjust_request_voltage(link_status, i); 1008 pre = drm_dp_get_adjust_request_pre_emphasis(link_status, i); 1009 if (volt + pre > 3) 1010 cdns_mhdp_set_adjust_request_voltage(link_status, i, 1011 3 - pre); 1012 if (mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING) 1013 cdns_mhdp_set_adjust_request_voltage(link_status, i, 1014 max_volt); 1015 if (mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS) 1016 cdns_mhdp_set_adjust_request_pre_emphasis(link_status, 1017 i, max_pre); 1018 } 1019} 1020 1021static void cdns_mhdp_print_lt_status(const char *prefix, 1022 struct cdns_mhdp_device *mhdp, 1023 union phy_configure_opts *phy_cfg) 1024{ 1025 char vs[8] = "0/0/0/0"; 1026 char pe[8] = "0/0/0/0"; 1027 unsigned int i; 1028 1029 for (i = 0; i < mhdp->link.num_lanes; i++) { 1030 vs[i * 2] = '0' + phy_cfg->dp.voltage[i]; 1031 pe[i * 2] = '0' + phy_cfg->dp.pre[i]; 1032 } 1033 1034 vs[i * 2 - 1] = '\0'; 1035 pe[i * 2 - 1] = '\0'; 1036 1037 dev_dbg(mhdp->dev, "%s, %u lanes, %u Mbps, vs %s, pe %s\n", 1038 prefix, 1039 mhdp->link.num_lanes, mhdp->link.rate / 100, 1040 vs, pe); 1041} 1042 1043static bool cdns_mhdp_link_training_channel_eq(struct cdns_mhdp_device *mhdp, 1044 u8 eq_tps, 1045 unsigned int training_interval) 1046{ 1047 u8 lanes_data[CDNS_DP_MAX_NUM_LANES], fail_counter_short = 0; 1048 u8 link_status[DP_LINK_STATUS_SIZE]; 1049 union phy_configure_opts phy_cfg; 1050 u32 reg32; 1051 int ret; 1052 bool r; 1053 1054 dev_dbg(mhdp->dev, "Starting EQ phase\n"); 1055 1056 /* Enable link training TPS[eq_tps] in PHY */ 1057 reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_EN | 1058 CDNS_PHY_TRAINING_TYPE(eq_tps); 1059 if (eq_tps != 4) 1060 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; 1061 cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); 1062 1063 drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, 1064 (eq_tps != 4) ? eq_tps | DP_LINK_SCRAMBLING_DISABLE : 1065 CDNS_DP_TRAINING_PATTERN_4); 1066 1067 drm_dp_dpcd_read_link_status(&mhdp->aux, link_status); 1068 1069 do { 1070 cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data, 1071 &phy_cfg); 1072 phy_cfg.dp.lanes = mhdp->link.num_lanes; 1073 phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp); 1074 phy_cfg.dp.set_lanes = false; 1075 phy_cfg.dp.set_rate = false; 1076 phy_cfg.dp.set_voltages = true; 1077 ret = phy_configure(mhdp->phy, &phy_cfg); 1078 if (ret) { 1079 dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n", 1080 __func__, ret); 1081 goto err; 1082 } 1083 1084 cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, 1085 training_interval, lanes_data, link_status); 1086 1087 r = drm_dp_clock_recovery_ok(link_status, mhdp->link.num_lanes); 1088 if (!r) 1089 goto err; 1090 1091 if (drm_dp_channel_eq_ok(link_status, mhdp->link.num_lanes)) { 1092 cdns_mhdp_print_lt_status("EQ phase ok", mhdp, 1093 &phy_cfg); 1094 return true; 1095 } 1096 1097 fail_counter_short++; 1098 1099 cdns_mhdp_adjust_requested_eq(mhdp, link_status); 1100 } while (fail_counter_short < 5); 1101 1102err: 1103 cdns_mhdp_print_lt_status("EQ phase failed", mhdp, &phy_cfg); 1104 1105 return false; 1106} 1107 1108static void cdns_mhdp_adjust_requested_cr(struct cdns_mhdp_device *mhdp, 1109 u8 link_status[DP_LINK_STATUS_SIZE], 1110 u8 *req_volt, u8 *req_pre) 1111{ 1112 const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing); 1113 const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); 1114 unsigned int i; 1115 1116 for (i = 0; i < mhdp->link.num_lanes; i++) { 1117 u8 val; 1118 1119 val = mhdp->host.volt_swing & CDNS_FORCE_VOLT_SWING ? 1120 max_volt : req_volt[i]; 1121 cdns_mhdp_set_adjust_request_voltage(link_status, i, val); 1122 1123 val = mhdp->host.pre_emphasis & CDNS_FORCE_PRE_EMPHASIS ? 1124 max_pre : req_pre[i]; 1125 cdns_mhdp_set_adjust_request_pre_emphasis(link_status, i, val); 1126 } 1127} 1128 1129static 1130void cdns_mhdp_validate_cr(struct cdns_mhdp_device *mhdp, bool *cr_done, 1131 bool *same_before_adjust, bool *max_swing_reached, 1132 u8 before_cr[CDNS_DP_MAX_NUM_LANES], 1133 u8 after_cr[DP_LINK_STATUS_SIZE], u8 *req_volt, 1134 u8 *req_pre) 1135{ 1136 const u8 max_volt = CDNS_VOLT_SWING(mhdp->host.volt_swing); 1137 const u8 max_pre = CDNS_PRE_EMPHASIS(mhdp->host.pre_emphasis); 1138 bool same_pre, same_volt; 1139 unsigned int i; 1140 u8 adjust; 1141 1142 *same_before_adjust = false; 1143 *max_swing_reached = false; 1144 *cr_done = drm_dp_clock_recovery_ok(after_cr, mhdp->link.num_lanes); 1145 1146 for (i = 0; i < mhdp->link.num_lanes; i++) { 1147 adjust = drm_dp_get_adjust_request_voltage(after_cr, i); 1148 req_volt[i] = min(adjust, max_volt); 1149 1150 adjust = drm_dp_get_adjust_request_pre_emphasis(after_cr, i) >> 1151 DP_TRAIN_PRE_EMPHASIS_SHIFT; 1152 req_pre[i] = min(adjust, max_pre); 1153 1154 same_pre = (before_cr[i] & DP_TRAIN_PRE_EMPHASIS_MASK) == 1155 req_pre[i] << DP_TRAIN_PRE_EMPHASIS_SHIFT; 1156 same_volt = (before_cr[i] & DP_TRAIN_VOLTAGE_SWING_MASK) == 1157 req_volt[i]; 1158 if (same_pre && same_volt) 1159 *same_before_adjust = true; 1160 1161 /* 3.1.5.2 in DP Standard v1.4. Table 3-1 */ 1162 if (!*cr_done && req_volt[i] + req_pre[i] >= 3) { 1163 *max_swing_reached = true; 1164 return; 1165 } 1166 } 1167} 1168 1169static bool cdns_mhdp_link_training_cr(struct cdns_mhdp_device *mhdp) 1170{ 1171 u8 lanes_data[CDNS_DP_MAX_NUM_LANES], 1172 fail_counter_short = 0, fail_counter_cr_long = 0; 1173 u8 link_status[DP_LINK_STATUS_SIZE]; 1174 bool cr_done; 1175 union phy_configure_opts phy_cfg; 1176 int ret; 1177 1178 dev_dbg(mhdp->dev, "Starting CR phase\n"); 1179 1180 ret = cdns_mhdp_link_training_init(mhdp); 1181 if (ret) 1182 goto err; 1183 1184 drm_dp_dpcd_read_link_status(&mhdp->aux, link_status); 1185 1186 do { 1187 u8 requested_adjust_volt_swing[CDNS_DP_MAX_NUM_LANES] = {}; 1188 u8 requested_adjust_pre_emphasis[CDNS_DP_MAX_NUM_LANES] = {}; 1189 bool same_before_adjust, max_swing_reached; 1190 1191 cdns_mhdp_get_adjust_train(mhdp, link_status, lanes_data, 1192 &phy_cfg); 1193 phy_cfg.dp.lanes = mhdp->link.num_lanes; 1194 phy_cfg.dp.ssc = cdns_mhdp_get_ssc_supported(mhdp); 1195 phy_cfg.dp.set_lanes = false; 1196 phy_cfg.dp.set_rate = false; 1197 phy_cfg.dp.set_voltages = true; 1198 ret = phy_configure(mhdp->phy, &phy_cfg); 1199 if (ret) { 1200 dev_err(mhdp->dev, "%s: phy_configure() failed: %d\n", 1201 __func__, ret); 1202 goto err; 1203 } 1204 1205 cdns_mhdp_adjust_lt(mhdp, mhdp->link.num_lanes, 100, 1206 lanes_data, link_status); 1207 1208 cdns_mhdp_validate_cr(mhdp, &cr_done, &same_before_adjust, 1209 &max_swing_reached, lanes_data, 1210 link_status, 1211 requested_adjust_volt_swing, 1212 requested_adjust_pre_emphasis); 1213 1214 if (max_swing_reached) { 1215 dev_err(mhdp->dev, "CR: max swing reached\n"); 1216 goto err; 1217 } 1218 1219 if (cr_done) { 1220 cdns_mhdp_print_lt_status("CR phase ok", mhdp, 1221 &phy_cfg); 1222 return true; 1223 } 1224 1225 /* Not all CR_DONE bits set */ 1226 fail_counter_cr_long++; 1227 1228 if (same_before_adjust) { 1229 fail_counter_short++; 1230 continue; 1231 } 1232 1233 fail_counter_short = 0; 1234 /* 1235 * Voltage swing/pre-emphasis adjust requested 1236 * during CR phase 1237 */ 1238 cdns_mhdp_adjust_requested_cr(mhdp, link_status, 1239 requested_adjust_volt_swing, 1240 requested_adjust_pre_emphasis); 1241 } while (fail_counter_short < 5 && fail_counter_cr_long < 10); 1242 1243err: 1244 cdns_mhdp_print_lt_status("CR phase failed", mhdp, &phy_cfg); 1245 1246 return false; 1247} 1248 1249static void cdns_mhdp_lower_link_rate(struct cdns_mhdp_link *link) 1250{ 1251 switch (drm_dp_link_rate_to_bw_code(link->rate)) { 1252 case DP_LINK_BW_2_7: 1253 link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_1_62); 1254 break; 1255 case DP_LINK_BW_5_4: 1256 link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_2_7); 1257 break; 1258 case DP_LINK_BW_8_1: 1259 link->rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_5_4); 1260 break; 1261 } 1262} 1263 1264static int cdns_mhdp_link_training(struct cdns_mhdp_device *mhdp, 1265 unsigned int training_interval) 1266{ 1267 u32 reg32; 1268 const u8 eq_tps = cdns_mhdp_eq_training_pattern_supported(mhdp); 1269 int ret; 1270 1271 while (1) { 1272 if (!cdns_mhdp_link_training_cr(mhdp)) { 1273 if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) != 1274 DP_LINK_BW_1_62) { 1275 dev_dbg(mhdp->dev, 1276 "Reducing link rate during CR phase\n"); 1277 cdns_mhdp_lower_link_rate(&mhdp->link); 1278 1279 continue; 1280 } else if (mhdp->link.num_lanes > 1) { 1281 dev_dbg(mhdp->dev, 1282 "Reducing lanes number during CR phase\n"); 1283 mhdp->link.num_lanes >>= 1; 1284 mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp); 1285 1286 continue; 1287 } 1288 1289 dev_err(mhdp->dev, 1290 "Link training failed during CR phase\n"); 1291 goto err; 1292 } 1293 1294 if (cdns_mhdp_link_training_channel_eq(mhdp, eq_tps, 1295 training_interval)) 1296 break; 1297 1298 if (mhdp->link.num_lanes > 1) { 1299 dev_dbg(mhdp->dev, 1300 "Reducing lanes number during EQ phase\n"); 1301 mhdp->link.num_lanes >>= 1; 1302 1303 continue; 1304 } else if (drm_dp_link_rate_to_bw_code(mhdp->link.rate) != 1305 DP_LINK_BW_1_62) { 1306 dev_dbg(mhdp->dev, 1307 "Reducing link rate during EQ phase\n"); 1308 cdns_mhdp_lower_link_rate(&mhdp->link); 1309 mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp); 1310 1311 continue; 1312 } 1313 1314 dev_err(mhdp->dev, "Link training failed during EQ phase\n"); 1315 goto err; 1316 } 1317 1318 dev_dbg(mhdp->dev, "Link training ok. Lanes: %u, Rate %u Mbps\n", 1319 mhdp->link.num_lanes, mhdp->link.rate / 100); 1320 1321 drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, 1322 mhdp->host.scrambler ? 0 : 1323 DP_LINK_SCRAMBLING_DISABLE); 1324 1325 ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, ®32); 1326 if (ret < 0) { 1327 dev_err(mhdp->dev, 1328 "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n", 1329 ret); 1330 return ret; 1331 } 1332 reg32 &= ~GENMASK(1, 0); 1333 reg32 |= CDNS_DP_NUM_LANES(mhdp->link.num_lanes); 1334 reg32 |= CDNS_DP_WR_FAILING_EDGE_VSYNC; 1335 reg32 |= CDNS_DP_FRAMER_EN; 1336 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, reg32); 1337 1338 /* Reset PHY config */ 1339 reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); 1340 if (!mhdp->host.scrambler) 1341 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; 1342 cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); 1343 1344 return 0; 1345err: 1346 /* Reset PHY config */ 1347 reg32 = CDNS_PHY_COMMON_CONFIG | CDNS_PHY_TRAINING_TYPE(1); 1348 if (!mhdp->host.scrambler) 1349 reg32 |= CDNS_PHY_SCRAMBLER_BYPASS; 1350 cdns_mhdp_reg_write(mhdp, CDNS_DPTX_PHY_CONFIG, reg32); 1351 1352 drm_dp_dpcd_writeb(&mhdp->aux, DP_TRAINING_PATTERN_SET, 1353 DP_TRAINING_PATTERN_DISABLE); 1354 1355 return -EIO; 1356} 1357 1358static u32 cdns_mhdp_get_training_interval_us(struct cdns_mhdp_device *mhdp, 1359 u32 interval) 1360{ 1361 if (interval == 0) 1362 return 400; 1363 if (interval < 5) 1364 return 4000 << (interval - 1); 1365 dev_err(mhdp->dev, 1366 "wrong training interval returned by DPCD: %d\n", interval); 1367 return 0; 1368} 1369 1370static void cdns_mhdp_fill_host_caps(struct cdns_mhdp_device *mhdp) 1371{ 1372 unsigned int link_rate; 1373 1374 /* Get source capabilities based on PHY attributes */ 1375 1376 mhdp->host.lanes_cnt = mhdp->phy->attrs.bus_width; 1377 if (!mhdp->host.lanes_cnt) 1378 mhdp->host.lanes_cnt = 4; 1379 1380 link_rate = mhdp->phy->attrs.max_link_rate; 1381 if (!link_rate) 1382 link_rate = drm_dp_bw_code_to_link_rate(DP_LINK_BW_8_1); 1383 else 1384 /* PHY uses Mb/s, DRM uses tens of kb/s. */ 1385 link_rate *= 100; 1386 1387 mhdp->host.link_rate = link_rate; 1388 mhdp->host.volt_swing = CDNS_VOLT_SWING(3); 1389 mhdp->host.pre_emphasis = CDNS_PRE_EMPHASIS(3); 1390 mhdp->host.pattern_supp = CDNS_SUPPORT_TPS(1) | 1391 CDNS_SUPPORT_TPS(2) | CDNS_SUPPORT_TPS(3) | 1392 CDNS_SUPPORT_TPS(4); 1393 mhdp->host.lane_mapping = CDNS_LANE_MAPPING_NORMAL; 1394 mhdp->host.fast_link = false; 1395 mhdp->host.enhanced = true; 1396 mhdp->host.scrambler = true; 1397 mhdp->host.ssc = false; 1398} 1399 1400static void cdns_mhdp_fill_sink_caps(struct cdns_mhdp_device *mhdp, 1401 u8 dpcd[DP_RECEIVER_CAP_SIZE]) 1402{ 1403 mhdp->sink.link_rate = mhdp->link.rate; 1404 mhdp->sink.lanes_cnt = mhdp->link.num_lanes; 1405 mhdp->sink.enhanced = !!(mhdp->link.capabilities & 1406 DP_LINK_CAP_ENHANCED_FRAMING); 1407 1408 /* Set SSC support */ 1409 mhdp->sink.ssc = !!(dpcd[DP_MAX_DOWNSPREAD] & 1410 DP_MAX_DOWNSPREAD_0_5); 1411 1412 /* Set TPS support */ 1413 mhdp->sink.pattern_supp = CDNS_SUPPORT_TPS(1) | CDNS_SUPPORT_TPS(2); 1414 if (drm_dp_tps3_supported(dpcd)) 1415 mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(3); 1416 if (drm_dp_tps4_supported(dpcd)) 1417 mhdp->sink.pattern_supp |= CDNS_SUPPORT_TPS(4); 1418 1419 /* Set fast link support */ 1420 mhdp->sink.fast_link = !!(dpcd[DP_MAX_DOWNSPREAD] & 1421 DP_NO_AUX_HANDSHAKE_LINK_TRAINING); 1422} 1423 1424static int cdns_mhdp_link_up(struct cdns_mhdp_device *mhdp) 1425{ 1426 u8 dpcd[DP_RECEIVER_CAP_SIZE], amp[2]; 1427 u32 resp, interval, interval_us; 1428 u8 ext_cap_chk = 0; 1429 unsigned int addr; 1430 int err; 1431 1432 WARN_ON(!mutex_is_locked(&mhdp->link_mutex)); 1433 1434 drm_dp_dpcd_readb(&mhdp->aux, DP_TRAINING_AUX_RD_INTERVAL, 1435 &ext_cap_chk); 1436 1437 if (ext_cap_chk & DP_EXTENDED_RECEIVER_CAP_FIELD_PRESENT) 1438 addr = DP_DP13_DPCD_REV; 1439 else 1440 addr = DP_DPCD_REV; 1441 1442 err = drm_dp_dpcd_read(&mhdp->aux, addr, dpcd, DP_RECEIVER_CAP_SIZE); 1443 if (err < 0) { 1444 dev_err(mhdp->dev, "Failed to read receiver capabilities\n"); 1445 return err; 1446 } 1447 1448 mhdp->link.revision = dpcd[0]; 1449 mhdp->link.rate = drm_dp_bw_code_to_link_rate(dpcd[1]); 1450 mhdp->link.num_lanes = dpcd[2] & DP_MAX_LANE_COUNT_MASK; 1451 1452 if (dpcd[2] & DP_ENHANCED_FRAME_CAP) 1453 mhdp->link.capabilities |= DP_LINK_CAP_ENHANCED_FRAMING; 1454 1455 dev_dbg(mhdp->dev, "Set sink device power state via DPCD\n"); 1456 cdns_mhdp_link_power_up(&mhdp->aux, &mhdp->link); 1457 1458 cdns_mhdp_fill_sink_caps(mhdp, dpcd); 1459 1460 mhdp->link.rate = cdns_mhdp_max_link_rate(mhdp); 1461 mhdp->link.num_lanes = cdns_mhdp_max_num_lanes(mhdp); 1462 1463 /* Disable framer for link training */ 1464 err = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp); 1465 if (err < 0) { 1466 dev_err(mhdp->dev, 1467 "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n", 1468 err); 1469 return err; 1470 } 1471 1472 resp &= ~CDNS_DP_FRAMER_EN; 1473 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp); 1474 1475 /* Spread AMP if required, enable 8b/10b coding */ 1476 amp[0] = cdns_mhdp_get_ssc_supported(mhdp) ? DP_SPREAD_AMP_0_5 : 0; 1477 amp[1] = DP_SET_ANSI_8B10B; 1478 drm_dp_dpcd_write(&mhdp->aux, DP_DOWNSPREAD_CTRL, amp, 2); 1479 1480 if (mhdp->host.fast_link & mhdp->sink.fast_link) { 1481 dev_err(mhdp->dev, "fastlink not supported\n"); 1482 return -EOPNOTSUPP; 1483 } 1484 1485 interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & DP_TRAINING_AUX_RD_MASK; 1486 interval_us = cdns_mhdp_get_training_interval_us(mhdp, interval); 1487 if (!interval_us || 1488 cdns_mhdp_link_training(mhdp, interval_us)) { 1489 dev_err(mhdp->dev, "Link training failed. Exiting.\n"); 1490 return -EIO; 1491 } 1492 1493 mhdp->link_up = true; 1494 1495 return 0; 1496} 1497 1498static void cdns_mhdp_link_down(struct cdns_mhdp_device *mhdp) 1499{ 1500 WARN_ON(!mutex_is_locked(&mhdp->link_mutex)); 1501 1502 if (mhdp->plugged) 1503 cdns_mhdp_link_power_down(&mhdp->aux, &mhdp->link); 1504 1505 mhdp->link_up = false; 1506} 1507 1508static const struct drm_edid *cdns_mhdp_edid_read(struct cdns_mhdp_device *mhdp, 1509 struct drm_connector *connector) 1510{ 1511 if (!mhdp->plugged) 1512 return NULL; 1513 1514 return drm_edid_read_custom(connector, cdns_mhdp_get_edid_block, mhdp); 1515} 1516 1517static int cdns_mhdp_get_modes(struct drm_connector *connector) 1518{ 1519 struct cdns_mhdp_device *mhdp = connector_to_mhdp(connector); 1520 const struct drm_edid *drm_edid; 1521 int num_modes; 1522 1523 if (!mhdp->plugged) 1524 return 0; 1525 1526 drm_edid = cdns_mhdp_edid_read(mhdp, connector); 1527 1528 drm_edid_connector_update(connector, drm_edid); 1529 1530 if (!drm_edid) { 1531 dev_err(mhdp->dev, "Failed to read EDID\n"); 1532 return 0; 1533 } 1534 1535 num_modes = drm_edid_connector_add_modes(connector); 1536 drm_edid_free(drm_edid); 1537 1538 /* 1539 * HACK: Warn about unsupported display formats until we deal 1540 * with them correctly. 1541 */ 1542 if (connector->display_info.color_formats && 1543 !(connector->display_info.color_formats & 1544 mhdp->display_fmt.color_format)) 1545 dev_warn(mhdp->dev, 1546 "%s: No supported color_format found (0x%08x)\n", 1547 __func__, connector->display_info.color_formats); 1548 1549 if (connector->display_info.bpc && 1550 connector->display_info.bpc < mhdp->display_fmt.bpc) 1551 dev_warn(mhdp->dev, "%s: Display bpc only %d < %d\n", 1552 __func__, connector->display_info.bpc, 1553 mhdp->display_fmt.bpc); 1554 1555 return num_modes; 1556} 1557 1558static int cdns_mhdp_connector_detect(struct drm_connector *conn, 1559 struct drm_modeset_acquire_ctx *ctx, 1560 bool force) 1561{ 1562 struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn); 1563 1564 return cdns_mhdp_detect(mhdp); 1565} 1566 1567static u32 cdns_mhdp_get_bpp(struct cdns_mhdp_display_fmt *fmt) 1568{ 1569 u32 bpp; 1570 1571 if (fmt->y_only) 1572 return fmt->bpc; 1573 1574 switch (fmt->color_format) { 1575 case DRM_COLOR_FORMAT_RGB444: 1576 case DRM_COLOR_FORMAT_YCBCR444: 1577 bpp = fmt->bpc * 3; 1578 break; 1579 case DRM_COLOR_FORMAT_YCBCR422: 1580 bpp = fmt->bpc * 2; 1581 break; 1582 case DRM_COLOR_FORMAT_YCBCR420: 1583 bpp = fmt->bpc * 3 / 2; 1584 break; 1585 default: 1586 bpp = fmt->bpc * 3; 1587 WARN_ON(1); 1588 } 1589 return bpp; 1590} 1591 1592static 1593bool cdns_mhdp_bandwidth_ok(struct cdns_mhdp_device *mhdp, 1594 const struct drm_display_mode *mode, 1595 unsigned int lanes, unsigned int rate) 1596{ 1597 u32 max_bw, req_bw, bpp; 1598 1599 /* 1600 * mode->clock is expressed in kHz. Multiplying by bpp and dividing by 8 1601 * we get the number of kB/s. DisplayPort applies a 8b-10b encoding, the 1602 * value thus equals the bandwidth in 10kb/s units, which matches the 1603 * units of the rate parameter. 1604 */ 1605 1606 bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt); 1607 req_bw = mode->clock * bpp / 8; 1608 max_bw = lanes * rate; 1609 if (req_bw > max_bw) { 1610 dev_dbg(mhdp->dev, 1611 "Unsupported Mode: %s, Req BW: %u, Available Max BW:%u\n", 1612 mode->name, req_bw, max_bw); 1613 1614 return false; 1615 } 1616 1617 return true; 1618} 1619 1620static 1621enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn, 1622 struct drm_display_mode *mode) 1623{ 1624 struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn); 1625 1626 mutex_lock(&mhdp->link_mutex); 1627 1628 if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes, 1629 mhdp->link.rate)) { 1630 mutex_unlock(&mhdp->link_mutex); 1631 return MODE_CLOCK_HIGH; 1632 } 1633 1634 mutex_unlock(&mhdp->link_mutex); 1635 return MODE_OK; 1636} 1637 1638static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn, 1639 struct drm_atomic_state *state) 1640{ 1641 struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn); 1642 struct drm_connector_state *old_state, *new_state; 1643 struct drm_crtc_state *crtc_state; 1644 u64 old_cp, new_cp; 1645 1646 if (!mhdp->hdcp_supported) 1647 return 0; 1648 1649 old_state = drm_atomic_get_old_connector_state(state, conn); 1650 new_state = drm_atomic_get_new_connector_state(state, conn); 1651 old_cp = old_state->content_protection; 1652 new_cp = new_state->content_protection; 1653 1654 if (old_state->hdcp_content_type != new_state->hdcp_content_type && 1655 new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) { 1656 new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED; 1657 goto mode_changed; 1658 } 1659 1660 if (!new_state->crtc) { 1661 if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) 1662 new_state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED; 1663 return 0; 1664 } 1665 1666 if (old_cp == new_cp || 1667 (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED && 1668 new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) 1669 return 0; 1670 1671mode_changed: 1672 crtc_state = drm_atomic_get_new_crtc_state(state, new_state->crtc); 1673 crtc_state->mode_changed = true; 1674 1675 return 0; 1676} 1677 1678static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = { 1679 .detect_ctx = cdns_mhdp_connector_detect, 1680 .get_modes = cdns_mhdp_get_modes, 1681 .mode_valid = cdns_mhdp_mode_valid, 1682 .atomic_check = cdns_mhdp_connector_atomic_check, 1683}; 1684 1685static const struct drm_connector_funcs cdns_mhdp_conn_funcs = { 1686 .fill_modes = drm_helper_probe_single_connector_modes, 1687 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 1688 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 1689 .reset = drm_atomic_helper_connector_reset, 1690 .destroy = drm_connector_cleanup, 1691}; 1692 1693static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp) 1694{ 1695 u32 bus_format = MEDIA_BUS_FMT_RGB121212_1X36; 1696 struct drm_connector *conn = &mhdp->connector; 1697 struct drm_bridge *bridge = &mhdp->bridge; 1698 int ret; 1699 1700 if (!bridge->encoder) { 1701 dev_err(mhdp->dev, "Parent encoder object not found"); 1702 return -ENODEV; 1703 } 1704 1705 conn->polled = DRM_CONNECTOR_POLL_HPD; 1706 1707 ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs, 1708 DRM_MODE_CONNECTOR_DisplayPort); 1709 if (ret) { 1710 dev_err(mhdp->dev, "Failed to initialize connector with drm\n"); 1711 return ret; 1712 } 1713 1714 drm_connector_helper_add(conn, &cdns_mhdp_conn_helper_funcs); 1715 1716 ret = drm_display_info_set_bus_formats(&conn->display_info, 1717 &bus_format, 1); 1718 if (ret) 1719 return ret; 1720 1721 ret = drm_connector_attach_encoder(conn, bridge->encoder); 1722 if (ret) { 1723 dev_err(mhdp->dev, "Failed to attach connector to encoder\n"); 1724 return ret; 1725 } 1726 1727 if (mhdp->hdcp_supported) 1728 ret = drm_connector_attach_content_protection_property(conn, true); 1729 1730 return ret; 1731} 1732 1733static int cdns_mhdp_attach(struct drm_bridge *bridge, 1734 enum drm_bridge_attach_flags flags) 1735{ 1736 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 1737 bool hw_ready; 1738 int ret; 1739 1740 dev_dbg(mhdp->dev, "%s\n", __func__); 1741 1742 mhdp->aux.drm_dev = bridge->dev; 1743 ret = drm_dp_aux_register(&mhdp->aux); 1744 if (ret < 0) 1745 return ret; 1746 1747 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { 1748 ret = cdns_mhdp_connector_init(mhdp); 1749 if (ret) 1750 goto aux_unregister; 1751 } 1752 1753 spin_lock(&mhdp->start_lock); 1754 1755 mhdp->bridge_attached = true; 1756 hw_ready = mhdp->hw_state == MHDP_HW_READY; 1757 1758 spin_unlock(&mhdp->start_lock); 1759 1760 /* Enable SW event interrupts */ 1761 if (hw_ready) 1762 cdns_mhdp_bridge_hpd_enable(bridge); 1763 1764 return 0; 1765aux_unregister: 1766 drm_dp_aux_unregister(&mhdp->aux); 1767 return ret; 1768} 1769 1770static void cdns_mhdp_configure_video(struct cdns_mhdp_device *mhdp, 1771 const struct drm_display_mode *mode) 1772{ 1773 unsigned int dp_framer_sp = 0, msa_horizontal_1, 1774 msa_vertical_1, bnd_hsync2vsync, hsync2vsync_pol_ctrl, 1775 misc0 = 0, misc1 = 0, pxl_repr, 1776 front_porch, back_porch, msa_h0, msa_v0, hsync, vsync, 1777 dp_vertical_1; 1778 u8 stream_id = mhdp->stream_id; 1779 u32 bpp, bpc, pxlfmt, framer; 1780 int ret; 1781 1782 pxlfmt = mhdp->display_fmt.color_format; 1783 bpc = mhdp->display_fmt.bpc; 1784 1785 /* 1786 * If YCBCR supported and stream not SD, use ITU709 1787 * Need to handle ITU version with YCBCR420 when supported 1788 */ 1789 if ((pxlfmt == DRM_COLOR_FORMAT_YCBCR444 || 1790 pxlfmt == DRM_COLOR_FORMAT_YCBCR422) && mode->crtc_vdisplay >= 720) 1791 misc0 = DP_YCBCR_COEFFICIENTS_ITU709; 1792 1793 bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt); 1794 1795 switch (pxlfmt) { 1796 case DRM_COLOR_FORMAT_RGB444: 1797 pxl_repr = CDNS_DP_FRAMER_RGB << CDNS_DP_FRAMER_PXL_FORMAT; 1798 misc0 |= DP_COLOR_FORMAT_RGB; 1799 break; 1800 case DRM_COLOR_FORMAT_YCBCR444: 1801 pxl_repr = CDNS_DP_FRAMER_YCBCR444 << CDNS_DP_FRAMER_PXL_FORMAT; 1802 misc0 |= DP_COLOR_FORMAT_YCbCr444 | DP_TEST_DYNAMIC_RANGE_CEA; 1803 break; 1804 case DRM_COLOR_FORMAT_YCBCR422: 1805 pxl_repr = CDNS_DP_FRAMER_YCBCR422 << CDNS_DP_FRAMER_PXL_FORMAT; 1806 misc0 |= DP_COLOR_FORMAT_YCbCr422 | DP_TEST_DYNAMIC_RANGE_CEA; 1807 break; 1808 case DRM_COLOR_FORMAT_YCBCR420: 1809 pxl_repr = CDNS_DP_FRAMER_YCBCR420 << CDNS_DP_FRAMER_PXL_FORMAT; 1810 break; 1811 default: 1812 pxl_repr = CDNS_DP_FRAMER_Y_ONLY << CDNS_DP_FRAMER_PXL_FORMAT; 1813 } 1814 1815 switch (bpc) { 1816 case 6: 1817 misc0 |= DP_TEST_BIT_DEPTH_6; 1818 pxl_repr |= CDNS_DP_FRAMER_6_BPC; 1819 break; 1820 case 8: 1821 misc0 |= DP_TEST_BIT_DEPTH_8; 1822 pxl_repr |= CDNS_DP_FRAMER_8_BPC; 1823 break; 1824 case 10: 1825 misc0 |= DP_TEST_BIT_DEPTH_10; 1826 pxl_repr |= CDNS_DP_FRAMER_10_BPC; 1827 break; 1828 case 12: 1829 misc0 |= DP_TEST_BIT_DEPTH_12; 1830 pxl_repr |= CDNS_DP_FRAMER_12_BPC; 1831 break; 1832 case 16: 1833 misc0 |= DP_TEST_BIT_DEPTH_16; 1834 pxl_repr |= CDNS_DP_FRAMER_16_BPC; 1835 break; 1836 } 1837 1838 bnd_hsync2vsync = CDNS_IP_BYPASS_V_INTERFACE; 1839 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 1840 bnd_hsync2vsync |= CDNS_IP_DET_INTERLACE_FORMAT; 1841 1842 cdns_mhdp_reg_write(mhdp, CDNS_BND_HSYNC2VSYNC(stream_id), 1843 bnd_hsync2vsync); 1844 1845 hsync2vsync_pol_ctrl = 0; 1846 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 1847 hsync2vsync_pol_ctrl |= CDNS_H2V_HSYNC_POL_ACTIVE_LOW; 1848 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 1849 hsync2vsync_pol_ctrl |= CDNS_H2V_VSYNC_POL_ACTIVE_LOW; 1850 cdns_mhdp_reg_write(mhdp, CDNS_HSYNC2VSYNC_POL_CTRL(stream_id), 1851 hsync2vsync_pol_ctrl); 1852 1853 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_PXL_REPR(stream_id), pxl_repr); 1854 1855 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 1856 dp_framer_sp |= CDNS_DP_FRAMER_INTERLACE; 1857 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 1858 dp_framer_sp |= CDNS_DP_FRAMER_HSYNC_POL_LOW; 1859 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 1860 dp_framer_sp |= CDNS_DP_FRAMER_VSYNC_POL_LOW; 1861 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_SP(stream_id), dp_framer_sp); 1862 1863 front_porch = mode->crtc_hsync_start - mode->crtc_hdisplay; 1864 back_porch = mode->crtc_htotal - mode->crtc_hsync_end; 1865 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRONT_BACK_PORCH(stream_id), 1866 CDNS_DP_FRONT_PORCH(front_porch) | 1867 CDNS_DP_BACK_PORCH(back_porch)); 1868 1869 cdns_mhdp_reg_write(mhdp, CDNS_DP_BYTE_COUNT(stream_id), 1870 mode->crtc_hdisplay * bpp / 8); 1871 1872 msa_h0 = mode->crtc_htotal - mode->crtc_hsync_start; 1873 cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_0(stream_id), 1874 CDNS_DP_MSAH0_H_TOTAL(mode->crtc_htotal) | 1875 CDNS_DP_MSAH0_HSYNC_START(msa_h0)); 1876 1877 hsync = mode->crtc_hsync_end - mode->crtc_hsync_start; 1878 msa_horizontal_1 = CDNS_DP_MSAH1_HSYNC_WIDTH(hsync) | 1879 CDNS_DP_MSAH1_HDISP_WIDTH(mode->crtc_hdisplay); 1880 if (mode->flags & DRM_MODE_FLAG_NHSYNC) 1881 msa_horizontal_1 |= CDNS_DP_MSAH1_HSYNC_POL_LOW; 1882 cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_HORIZONTAL_1(stream_id), 1883 msa_horizontal_1); 1884 1885 msa_v0 = mode->crtc_vtotal - mode->crtc_vsync_start; 1886 cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_0(stream_id), 1887 CDNS_DP_MSAV0_V_TOTAL(mode->crtc_vtotal) | 1888 CDNS_DP_MSAV0_VSYNC_START(msa_v0)); 1889 1890 vsync = mode->crtc_vsync_end - mode->crtc_vsync_start; 1891 msa_vertical_1 = CDNS_DP_MSAV1_VSYNC_WIDTH(vsync) | 1892 CDNS_DP_MSAV1_VDISP_WIDTH(mode->crtc_vdisplay); 1893 if (mode->flags & DRM_MODE_FLAG_NVSYNC) 1894 msa_vertical_1 |= CDNS_DP_MSAV1_VSYNC_POL_LOW; 1895 cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_VERTICAL_1(stream_id), 1896 msa_vertical_1); 1897 1898 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && 1899 mode->crtc_vtotal % 2 == 0) 1900 misc1 = DP_TEST_INTERLACED; 1901 if (mhdp->display_fmt.y_only) 1902 misc1 |= CDNS_DP_TEST_COLOR_FORMAT_RAW_Y_ONLY; 1903 /* Use VSC SDP for Y420 */ 1904 if (pxlfmt == DRM_COLOR_FORMAT_YCBCR420) 1905 misc1 = CDNS_DP_TEST_VSC_SDP; 1906 1907 cdns_mhdp_reg_write(mhdp, CDNS_DP_MSA_MISC(stream_id), 1908 misc0 | (misc1 << 8)); 1909 1910 cdns_mhdp_reg_write(mhdp, CDNS_DP_HORIZONTAL(stream_id), 1911 CDNS_DP_H_HSYNC_WIDTH(hsync) | 1912 CDNS_DP_H_H_TOTAL(mode->crtc_hdisplay)); 1913 1914 cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_0(stream_id), 1915 CDNS_DP_V0_VHEIGHT(mode->crtc_vdisplay) | 1916 CDNS_DP_V0_VSTART(msa_v0)); 1917 1918 dp_vertical_1 = CDNS_DP_V1_VTOTAL(mode->crtc_vtotal); 1919 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && 1920 mode->crtc_vtotal % 2 == 0) 1921 dp_vertical_1 |= CDNS_DP_V1_VTOTAL_EVEN; 1922 1923 cdns_mhdp_reg_write(mhdp, CDNS_DP_VERTICAL_1(stream_id), dp_vertical_1); 1924 1925 cdns_mhdp_reg_write_bit(mhdp, CDNS_DP_VB_ID(stream_id), 2, 1, 1926 (mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1927 CDNS_DP_VB_ID_INTERLACED : 0); 1928 1929 ret = cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &framer); 1930 if (ret < 0) { 1931 dev_err(mhdp->dev, 1932 "Failed to read CDNS_DP_FRAMER_GLOBAL_CONFIG %d\n", 1933 ret); 1934 return; 1935 } 1936 framer |= CDNS_DP_FRAMER_EN; 1937 framer &= ~CDNS_DP_NO_VIDEO_MODE; 1938 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, framer); 1939} 1940 1941static void cdns_mhdp_sst_enable(struct cdns_mhdp_device *mhdp, 1942 const struct drm_display_mode *mode) 1943{ 1944 u32 rate, vs, required_bandwidth, available_bandwidth; 1945 s32 line_thresh1, line_thresh2, line_thresh = 0; 1946 int pxlclock = mode->crtc_clock; 1947 u32 tu_size = 64; 1948 u32 bpp; 1949 1950 /* Get rate in MSymbols per second per lane */ 1951 rate = mhdp->link.rate / 1000; 1952 1953 bpp = cdns_mhdp_get_bpp(&mhdp->display_fmt); 1954 1955 required_bandwidth = pxlclock * bpp / 8; 1956 available_bandwidth = mhdp->link.num_lanes * rate; 1957 1958 vs = tu_size * required_bandwidth / available_bandwidth; 1959 vs /= 1000; 1960 1961 if (vs == tu_size) 1962 vs = tu_size - 1; 1963 1964 line_thresh1 = ((vs + 1) << 5) * 8 / bpp; 1965 line_thresh2 = (pxlclock << 5) / 1000 / rate * (vs + 1) - (1 << 5); 1966 line_thresh = line_thresh1 - line_thresh2 / (s32)mhdp->link.num_lanes; 1967 line_thresh = (line_thresh >> 5) + 2; 1968 1969 mhdp->stream_id = 0; 1970 1971 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_TU, 1972 CDNS_DP_FRAMER_TU_VS(vs) | 1973 CDNS_DP_FRAMER_TU_SIZE(tu_size) | 1974 CDNS_DP_FRAMER_TU_CNT_RST_EN); 1975 1976 cdns_mhdp_reg_write(mhdp, CDNS_DP_LINE_THRESH(0), 1977 line_thresh & GENMASK(5, 0)); 1978 1979 cdns_mhdp_reg_write(mhdp, CDNS_DP_STREAM_CONFIG_2(0), 1980 CDNS_DP_SC2_TU_VS_DIFF((tu_size - vs > 3) ? 1981 0 : tu_size - vs)); 1982 1983 cdns_mhdp_configure_video(mhdp, mode); 1984} 1985 1986static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge, 1987 struct drm_bridge_state *bridge_state) 1988{ 1989 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 1990 struct drm_atomic_state *state = bridge_state->base.state; 1991 struct cdns_mhdp_bridge_state *mhdp_state; 1992 struct drm_crtc_state *crtc_state; 1993 struct drm_connector *connector; 1994 struct drm_connector_state *conn_state; 1995 struct drm_bridge_state *new_state; 1996 const struct drm_display_mode *mode; 1997 u32 resp; 1998 int ret; 1999 2000 dev_dbg(mhdp->dev, "bridge enable\n"); 2001 2002 mutex_lock(&mhdp->link_mutex); 2003 2004 if (mhdp->plugged && !mhdp->link_up) { 2005 ret = cdns_mhdp_link_up(mhdp); 2006 if (ret < 0) 2007 goto out; 2008 } 2009 2010 if (mhdp->info && mhdp->info->ops && mhdp->info->ops->enable) 2011 mhdp->info->ops->enable(mhdp); 2012 2013 /* Enable VIF clock for stream 0 */ 2014 ret = cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp); 2015 if (ret < 0) { 2016 dev_err(mhdp->dev, "Failed to read CDNS_DPTX_CAR %d\n", ret); 2017 goto out; 2018 } 2019 2020 cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR, 2021 resp | CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN); 2022 2023 connector = drm_atomic_get_new_connector_for_encoder(state, 2024 bridge->encoder); 2025 if (WARN_ON(!connector)) 2026 goto out; 2027 2028 conn_state = drm_atomic_get_new_connector_state(state, connector); 2029 if (WARN_ON(!conn_state)) 2030 goto out; 2031 2032 if (mhdp->hdcp_supported && 2033 mhdp->hw_state == MHDP_HW_READY && 2034 conn_state->content_protection == 2035 DRM_MODE_CONTENT_PROTECTION_DESIRED) { 2036 mutex_unlock(&mhdp->link_mutex); 2037 cdns_mhdp_hdcp_enable(mhdp, conn_state->hdcp_content_type); 2038 mutex_lock(&mhdp->link_mutex); 2039 } 2040 2041 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc); 2042 if (WARN_ON(!crtc_state)) 2043 goto out; 2044 2045 mode = &crtc_state->adjusted_mode; 2046 2047 new_state = drm_atomic_get_new_bridge_state(state, bridge); 2048 if (WARN_ON(!new_state)) 2049 goto out; 2050 2051 if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes, 2052 mhdp->link.rate)) { 2053 ret = -EINVAL; 2054 goto out; 2055 } 2056 2057 cdns_mhdp_sst_enable(mhdp, mode); 2058 2059 mhdp_state = to_cdns_mhdp_bridge_state(new_state); 2060 2061 mhdp_state->current_mode = drm_mode_duplicate(bridge->dev, mode); 2062 drm_mode_set_name(mhdp_state->current_mode); 2063 2064 dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, mode->name); 2065 2066 mhdp->bridge_enabled = true; 2067 2068out: 2069 mutex_unlock(&mhdp->link_mutex); 2070 if (ret < 0) 2071 schedule_work(&mhdp->modeset_retry_work); 2072} 2073 2074static void cdns_mhdp_atomic_disable(struct drm_bridge *bridge, 2075 struct drm_bridge_state *bridge_state) 2076{ 2077 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 2078 u32 resp; 2079 2080 dev_dbg(mhdp->dev, "%s\n", __func__); 2081 2082 mutex_lock(&mhdp->link_mutex); 2083 2084 if (mhdp->hdcp_supported) 2085 cdns_mhdp_hdcp_disable(mhdp); 2086 2087 mhdp->bridge_enabled = false; 2088 cdns_mhdp_reg_read(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, &resp); 2089 resp &= ~CDNS_DP_FRAMER_EN; 2090 resp |= CDNS_DP_NO_VIDEO_MODE; 2091 cdns_mhdp_reg_write(mhdp, CDNS_DP_FRAMER_GLOBAL_CONFIG, resp); 2092 2093 cdns_mhdp_link_down(mhdp); 2094 2095 /* Disable VIF clock for stream 0 */ 2096 cdns_mhdp_reg_read(mhdp, CDNS_DPTX_CAR, &resp); 2097 cdns_mhdp_reg_write(mhdp, CDNS_DPTX_CAR, 2098 resp & ~(CDNS_VIF_CLK_EN | CDNS_VIF_CLK_RSTN)); 2099 2100 if (mhdp->info && mhdp->info->ops && mhdp->info->ops->disable) 2101 mhdp->info->ops->disable(mhdp); 2102 2103 mutex_unlock(&mhdp->link_mutex); 2104} 2105 2106static void cdns_mhdp_detach(struct drm_bridge *bridge) 2107{ 2108 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 2109 2110 dev_dbg(mhdp->dev, "%s\n", __func__); 2111 2112 drm_dp_aux_unregister(&mhdp->aux); 2113 2114 spin_lock(&mhdp->start_lock); 2115 2116 mhdp->bridge_attached = false; 2117 2118 spin_unlock(&mhdp->start_lock); 2119 2120 writel(~0, mhdp->regs + CDNS_APB_INT_MASK); 2121} 2122 2123static struct drm_bridge_state * 2124cdns_mhdp_bridge_atomic_duplicate_state(struct drm_bridge *bridge) 2125{ 2126 struct cdns_mhdp_bridge_state *state; 2127 2128 state = kzalloc(sizeof(*state), GFP_KERNEL); 2129 if (!state) 2130 return NULL; 2131 2132 __drm_atomic_helper_bridge_duplicate_state(bridge, &state->base); 2133 2134 return &state->base; 2135} 2136 2137static void 2138cdns_mhdp_bridge_atomic_destroy_state(struct drm_bridge *bridge, 2139 struct drm_bridge_state *state) 2140{ 2141 struct cdns_mhdp_bridge_state *cdns_mhdp_state; 2142 2143 cdns_mhdp_state = to_cdns_mhdp_bridge_state(state); 2144 2145 if (cdns_mhdp_state->current_mode) { 2146 drm_mode_destroy(bridge->dev, cdns_mhdp_state->current_mode); 2147 cdns_mhdp_state->current_mode = NULL; 2148 } 2149 2150 kfree(cdns_mhdp_state); 2151} 2152 2153static struct drm_bridge_state * 2154cdns_mhdp_bridge_atomic_reset(struct drm_bridge *bridge) 2155{ 2156 struct cdns_mhdp_bridge_state *cdns_mhdp_state; 2157 2158 cdns_mhdp_state = kzalloc(sizeof(*cdns_mhdp_state), GFP_KERNEL); 2159 if (!cdns_mhdp_state) 2160 return NULL; 2161 2162 __drm_atomic_helper_bridge_reset(bridge, &cdns_mhdp_state->base); 2163 2164 return &cdns_mhdp_state->base; 2165} 2166 2167static u32 *cdns_mhdp_get_input_bus_fmts(struct drm_bridge *bridge, 2168 struct drm_bridge_state *bridge_state, 2169 struct drm_crtc_state *crtc_state, 2170 struct drm_connector_state *conn_state, 2171 u32 output_fmt, 2172 unsigned int *num_input_fmts) 2173{ 2174 u32 *input_fmts; 2175 2176 *num_input_fmts = 0; 2177 2178 input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL); 2179 if (!input_fmts) 2180 return NULL; 2181 2182 *num_input_fmts = 1; 2183 input_fmts[0] = MEDIA_BUS_FMT_RGB121212_1X36; 2184 2185 return input_fmts; 2186} 2187 2188static int cdns_mhdp_atomic_check(struct drm_bridge *bridge, 2189 struct drm_bridge_state *bridge_state, 2190 struct drm_crtc_state *crtc_state, 2191 struct drm_connector_state *conn_state) 2192{ 2193 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 2194 const struct drm_display_mode *mode = &crtc_state->adjusted_mode; 2195 2196 mutex_lock(&mhdp->link_mutex); 2197 2198 if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes, 2199 mhdp->link.rate)) { 2200 dev_err(mhdp->dev, "%s: Not enough BW for %s (%u lanes at %u Mbps)\n", 2201 __func__, mode->name, mhdp->link.num_lanes, 2202 mhdp->link.rate / 100); 2203 mutex_unlock(&mhdp->link_mutex); 2204 return -EINVAL; 2205 } 2206 2207 /* 2208 * There might be flags negotiation supported in future. 2209 * Set the bus flags in atomic_check statically for now. 2210 */ 2211 if (mhdp->info) 2212 bridge_state->input_bus_cfg.flags = *mhdp->info->input_bus_flags; 2213 2214 mutex_unlock(&mhdp->link_mutex); 2215 return 0; 2216} 2217 2218static enum drm_connector_status cdns_mhdp_bridge_detect(struct drm_bridge *bridge) 2219{ 2220 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 2221 2222 return cdns_mhdp_detect(mhdp); 2223} 2224 2225static const struct drm_edid *cdns_mhdp_bridge_edid_read(struct drm_bridge *bridge, 2226 struct drm_connector *connector) 2227{ 2228 struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge); 2229 2230 return cdns_mhdp_edid_read(mhdp, connector); 2231} 2232 2233static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = { 2234 .atomic_enable = cdns_mhdp_atomic_enable, 2235 .atomic_disable = cdns_mhdp_atomic_disable, 2236 .atomic_check = cdns_mhdp_atomic_check, 2237 .attach = cdns_mhdp_attach, 2238 .detach = cdns_mhdp_detach, 2239 .atomic_duplicate_state = cdns_mhdp_bridge_atomic_duplicate_state, 2240 .atomic_destroy_state = cdns_mhdp_bridge_atomic_destroy_state, 2241 .atomic_reset = cdns_mhdp_bridge_atomic_reset, 2242 .atomic_get_input_bus_fmts = cdns_mhdp_get_input_bus_fmts, 2243 .detect = cdns_mhdp_bridge_detect, 2244 .edid_read = cdns_mhdp_bridge_edid_read, 2245 .hpd_enable = cdns_mhdp_bridge_hpd_enable, 2246 .hpd_disable = cdns_mhdp_bridge_hpd_disable, 2247}; 2248 2249static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool *hpd_pulse) 2250{ 2251 int hpd_event, hpd_status; 2252 2253 *hpd_pulse = false; 2254 2255 hpd_event = cdns_mhdp_read_hpd_event(mhdp); 2256 2257 /* Getting event bits failed, bail out */ 2258 if (hpd_event < 0) { 2259 dev_warn(mhdp->dev, "%s: read event failed: %d\n", 2260 __func__, hpd_event); 2261 return false; 2262 } 2263 2264 hpd_status = cdns_mhdp_get_hpd_status(mhdp); 2265 if (hpd_status < 0) { 2266 dev_warn(mhdp->dev, "%s: get hpd status failed: %d\n", 2267 __func__, hpd_status); 2268 return false; 2269 } 2270 2271 if (hpd_event & DPTX_READ_EVENT_HPD_PULSE) 2272 *hpd_pulse = true; 2273 2274 return !!hpd_status; 2275} 2276 2277static int cdns_mhdp_update_link_status(struct cdns_mhdp_device *mhdp) 2278{ 2279 struct cdns_mhdp_bridge_state *cdns_bridge_state; 2280 struct drm_display_mode *current_mode; 2281 bool old_plugged = mhdp->plugged; 2282 struct drm_bridge_state *state; 2283 u8 status[DP_LINK_STATUS_SIZE]; 2284 bool hpd_pulse; 2285 int ret = 0; 2286 2287 mutex_lock(&mhdp->link_mutex); 2288 2289 mhdp->plugged = cdns_mhdp_detect_hpd(mhdp, &hpd_pulse); 2290 2291 if (!mhdp->plugged) { 2292 cdns_mhdp_link_down(mhdp); 2293 mhdp->link.rate = mhdp->host.link_rate; 2294 mhdp->link.num_lanes = mhdp->host.lanes_cnt; 2295 goto out; 2296 } 2297 2298 /* 2299 * If we get a HPD pulse event and we were and still are connected, 2300 * check the link status. If link status is ok, there's nothing to do 2301 * as we don't handle DP interrupts. If link status is bad, continue 2302 * with full link setup. 2303 */ 2304 if (hpd_pulse && old_plugged == mhdp->plugged) { 2305 ret = drm_dp_dpcd_read_link_status(&mhdp->aux, status); 2306 2307 /* 2308 * If everything looks fine, just return, as we don't handle 2309 * DP IRQs. 2310 */ 2311 if (ret > 0 && 2312 drm_dp_channel_eq_ok(status, mhdp->link.num_lanes) && 2313 drm_dp_clock_recovery_ok(status, mhdp->link.num_lanes)) 2314 goto out; 2315 2316 /* If link is bad, mark link as down so that we do a new LT */ 2317 mhdp->link_up = false; 2318 } 2319 2320 if (!mhdp->link_up) { 2321 ret = cdns_mhdp_link_up(mhdp); 2322 if (ret < 0) 2323 goto out; 2324 } 2325 2326 if (mhdp->bridge_enabled) { 2327 state = drm_priv_to_bridge_state(mhdp->bridge.base.state); 2328 if (!state) { 2329 ret = -EINVAL; 2330 goto out; 2331 } 2332 2333 cdns_bridge_state = to_cdns_mhdp_bridge_state(state); 2334 if (!cdns_bridge_state) { 2335 ret = -EINVAL; 2336 goto out; 2337 } 2338 2339 current_mode = cdns_bridge_state->current_mode; 2340 if (!current_mode) { 2341 ret = -EINVAL; 2342 goto out; 2343 } 2344 2345 if (!cdns_mhdp_bandwidth_ok(mhdp, current_mode, mhdp->link.num_lanes, 2346 mhdp->link.rate)) { 2347 ret = -EINVAL; 2348 goto out; 2349 } 2350 2351 dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, 2352 current_mode->name); 2353 2354 cdns_mhdp_sst_enable(mhdp, current_mode); 2355 } 2356out: 2357 mutex_unlock(&mhdp->link_mutex); 2358 return ret; 2359} 2360 2361static void cdns_mhdp_modeset_retry_fn(struct work_struct *work) 2362{ 2363 struct cdns_mhdp_device *mhdp; 2364 struct drm_connector *conn; 2365 2366 mhdp = container_of(work, typeof(*mhdp), modeset_retry_work); 2367 2368 conn = &mhdp->connector; 2369 2370 /* Grab the locks before changing connector property */ 2371 mutex_lock(&conn->dev->mode_config.mutex); 2372 2373 /* 2374 * Set connector link status to BAD and send a Uevent to notify 2375 * userspace to do a modeset. 2376 */ 2377 drm_connector_set_link_status_property(conn, DRM_MODE_LINK_STATUS_BAD); 2378 mutex_unlock(&conn->dev->mode_config.mutex); 2379 2380 /* Send Hotplug uevent so userspace can reprobe */ 2381 drm_kms_helper_hotplug_event(mhdp->bridge.dev); 2382} 2383 2384static irqreturn_t cdns_mhdp_irq_handler(int irq, void *data) 2385{ 2386 struct cdns_mhdp_device *mhdp = data; 2387 u32 apb_stat, sw_ev0; 2388 bool bridge_attached; 2389 2390 apb_stat = readl(mhdp->regs + CDNS_APB_INT_STATUS); 2391 if (!(apb_stat & CDNS_APB_INT_MASK_SW_EVENT_INT)) 2392 return IRQ_NONE; 2393 2394 sw_ev0 = readl(mhdp->regs + CDNS_SW_EVENT0); 2395 2396 /* 2397 * Calling drm_kms_helper_hotplug_event() when not attached 2398 * to drm device causes an oops because the drm_bridge->dev 2399 * is NULL. See cdns_mhdp_fw_cb() comments for details about the 2400 * problems related drm_kms_helper_hotplug_event() call. 2401 */ 2402 spin_lock(&mhdp->start_lock); 2403 bridge_attached = mhdp->bridge_attached; 2404 spin_unlock(&mhdp->start_lock); 2405 2406 if (bridge_attached && (sw_ev0 & CDNS_DPTX_HPD)) { 2407 schedule_work(&mhdp->hpd_work); 2408 } 2409 2410 if (sw_ev0 & ~CDNS_DPTX_HPD) { 2411 mhdp->sw_events |= (sw_ev0 & ~CDNS_DPTX_HPD); 2412 wake_up(&mhdp->sw_events_wq); 2413 } 2414 2415 return IRQ_HANDLED; 2416} 2417 2418u32 cdns_mhdp_wait_for_sw_event(struct cdns_mhdp_device *mhdp, u32 event) 2419{ 2420 u32 ret; 2421 2422 ret = wait_event_timeout(mhdp->sw_events_wq, 2423 mhdp->sw_events & event, 2424 msecs_to_jiffies(500)); 2425 if (!ret) { 2426 dev_dbg(mhdp->dev, "SW event 0x%x timeout\n", event); 2427 goto sw_event_out; 2428 } 2429 2430 ret = mhdp->sw_events; 2431 mhdp->sw_events &= ~event; 2432 2433sw_event_out: 2434 return ret; 2435} 2436 2437static void cdns_mhdp_hpd_work(struct work_struct *work) 2438{ 2439 struct cdns_mhdp_device *mhdp = container_of(work, 2440 struct cdns_mhdp_device, 2441 hpd_work); 2442 int ret; 2443 2444 ret = cdns_mhdp_update_link_status(mhdp); 2445 if (mhdp->connector.dev) { 2446 if (ret < 0) 2447 schedule_work(&mhdp->modeset_retry_work); 2448 else 2449 drm_kms_helper_hotplug_event(mhdp->bridge.dev); 2450 } else { 2451 drm_bridge_hpd_notify(&mhdp->bridge, cdns_mhdp_detect(mhdp)); 2452 } 2453} 2454 2455static int cdns_mhdp_probe(struct platform_device *pdev) 2456{ 2457 struct device *dev = &pdev->dev; 2458 struct cdns_mhdp_device *mhdp; 2459 unsigned long rate; 2460 struct clk *clk; 2461 int ret; 2462 int irq; 2463 2464 mhdp = devm_kzalloc(dev, sizeof(*mhdp), GFP_KERNEL); 2465 if (!mhdp) 2466 return -ENOMEM; 2467 2468 clk = devm_clk_get(dev, NULL); 2469 if (IS_ERR(clk)) { 2470 dev_err(dev, "couldn't get clk: %ld\n", PTR_ERR(clk)); 2471 return PTR_ERR(clk); 2472 } 2473 2474 mhdp->clk = clk; 2475 mhdp->dev = dev; 2476 mutex_init(&mhdp->mbox_mutex); 2477 mutex_init(&mhdp->link_mutex); 2478 spin_lock_init(&mhdp->start_lock); 2479 2480 drm_dp_aux_init(&mhdp->aux); 2481 mhdp->aux.dev = dev; 2482 mhdp->aux.transfer = cdns_mhdp_transfer; 2483 2484 mhdp->regs = devm_platform_ioremap_resource(pdev, 0); 2485 if (IS_ERR(mhdp->regs)) { 2486 dev_err(dev, "Failed to get memory resource\n"); 2487 return PTR_ERR(mhdp->regs); 2488 } 2489 2490 mhdp->sapb_regs = devm_platform_ioremap_resource_byname(pdev, "mhdptx-sapb"); 2491 if (IS_ERR(mhdp->sapb_regs)) { 2492 mhdp->hdcp_supported = false; 2493 dev_warn(dev, 2494 "Failed to get SAPB memory resource, HDCP not supported\n"); 2495 } else { 2496 mhdp->hdcp_supported = true; 2497 } 2498 2499 mhdp->phy = devm_of_phy_get_by_index(dev, pdev->dev.of_node, 0); 2500 if (IS_ERR(mhdp->phy)) { 2501 dev_err(dev, "no PHY configured\n"); 2502 return PTR_ERR(mhdp->phy); 2503 } 2504 2505 platform_set_drvdata(pdev, mhdp); 2506 2507 mhdp->info = of_device_get_match_data(dev); 2508 2509 clk_prepare_enable(clk); 2510 2511 pm_runtime_enable(dev); 2512 ret = pm_runtime_resume_and_get(dev); 2513 if (ret < 0) { 2514 dev_err(dev, "pm_runtime_resume_and_get failed\n"); 2515 pm_runtime_disable(dev); 2516 goto clk_disable; 2517 } 2518 2519 if (mhdp->info && mhdp->info->ops && mhdp->info->ops->init) { 2520 ret = mhdp->info->ops->init(mhdp); 2521 if (ret != 0) { 2522 dev_err(dev, "MHDP platform initialization failed: %d\n", 2523 ret); 2524 goto runtime_put; 2525 } 2526 } 2527 2528 rate = clk_get_rate(clk); 2529 writel(rate % 1000000, mhdp->regs + CDNS_SW_CLK_L); 2530 writel(rate / 1000000, mhdp->regs + CDNS_SW_CLK_H); 2531 2532 dev_dbg(dev, "func clk rate %lu Hz\n", rate); 2533 2534 writel(~0, mhdp->regs + CDNS_APB_INT_MASK); 2535 2536 irq = platform_get_irq(pdev, 0); 2537 ret = devm_request_threaded_irq(mhdp->dev, irq, NULL, 2538 cdns_mhdp_irq_handler, IRQF_ONESHOT, 2539 "mhdp8546", mhdp); 2540 if (ret) { 2541 dev_err(dev, "cannot install IRQ %d\n", irq); 2542 ret = -EIO; 2543 goto plat_fini; 2544 } 2545 2546 cdns_mhdp_fill_host_caps(mhdp); 2547 2548 /* Initialize link rate and num of lanes to host values */ 2549 mhdp->link.rate = mhdp->host.link_rate; 2550 mhdp->link.num_lanes = mhdp->host.lanes_cnt; 2551 2552 /* The only currently supported format */ 2553 mhdp->display_fmt.y_only = false; 2554 mhdp->display_fmt.color_format = DRM_COLOR_FORMAT_RGB444; 2555 mhdp->display_fmt.bpc = 8; 2556 2557 mhdp->bridge.of_node = pdev->dev.of_node; 2558 mhdp->bridge.funcs = &cdns_mhdp_bridge_funcs; 2559 mhdp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | 2560 DRM_BRIDGE_OP_HPD; 2561 mhdp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort; 2562 2563 ret = phy_init(mhdp->phy); 2564 if (ret) { 2565 dev_err(mhdp->dev, "Failed to initialize PHY: %d\n", ret); 2566 goto plat_fini; 2567 } 2568 2569 /* Initialize the work for modeset in case of link train failure */ 2570 INIT_WORK(&mhdp->modeset_retry_work, cdns_mhdp_modeset_retry_fn); 2571 INIT_WORK(&mhdp->hpd_work, cdns_mhdp_hpd_work); 2572 2573 init_waitqueue_head(&mhdp->fw_load_wq); 2574 init_waitqueue_head(&mhdp->sw_events_wq); 2575 2576 ret = cdns_mhdp_load_firmware(mhdp); 2577 if (ret) 2578 goto phy_exit; 2579 2580 if (mhdp->hdcp_supported) 2581 cdns_mhdp_hdcp_init(mhdp); 2582 2583 drm_bridge_add(&mhdp->bridge); 2584 2585 return 0; 2586 2587phy_exit: 2588 phy_exit(mhdp->phy); 2589plat_fini: 2590 if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit) 2591 mhdp->info->ops->exit(mhdp); 2592runtime_put: 2593 pm_runtime_put_sync(dev); 2594 pm_runtime_disable(dev); 2595clk_disable: 2596 clk_disable_unprepare(mhdp->clk); 2597 2598 return ret; 2599} 2600 2601static void cdns_mhdp_remove(struct platform_device *pdev) 2602{ 2603 struct cdns_mhdp_device *mhdp = platform_get_drvdata(pdev); 2604 unsigned long timeout = msecs_to_jiffies(100); 2605 int ret; 2606 2607 drm_bridge_remove(&mhdp->bridge); 2608 2609 ret = wait_event_timeout(mhdp->fw_load_wq, 2610 mhdp->hw_state == MHDP_HW_READY, 2611 timeout); 2612 spin_lock(&mhdp->start_lock); 2613 mhdp->hw_state = MHDP_HW_STOPPED; 2614 spin_unlock(&mhdp->start_lock); 2615 2616 if (ret == 0) { 2617 dev_err(mhdp->dev, "%s: Timeout waiting for fw loading\n", 2618 __func__); 2619 } else { 2620 ret = cdns_mhdp_set_firmware_active(mhdp, false); 2621 if (ret) 2622 dev_err(mhdp->dev, "Failed to stop firmware (%pe)\n", 2623 ERR_PTR(ret)); 2624 } 2625 2626 phy_exit(mhdp->phy); 2627 2628 if (mhdp->info && mhdp->info->ops && mhdp->info->ops->exit) 2629 mhdp->info->ops->exit(mhdp); 2630 2631 pm_runtime_put_sync(&pdev->dev); 2632 pm_runtime_disable(&pdev->dev); 2633 2634 cancel_work_sync(&mhdp->modeset_retry_work); 2635 flush_work(&mhdp->hpd_work); 2636 /* Ignoring mhdp->hdcp.check_work and mhdp->hdcp.prop_work here. */ 2637 2638 clk_disable_unprepare(mhdp->clk); 2639} 2640 2641static const struct of_device_id mhdp_ids[] = { 2642 { .compatible = "cdns,mhdp8546", }, 2643#ifdef CONFIG_DRM_CDNS_MHDP8546_J721E 2644 { .compatible = "ti,j721e-mhdp8546", 2645 .data = &(const struct cdns_mhdp_platform_info) { 2646 .input_bus_flags = &mhdp_ti_j721e_bridge_input_bus_flags, 2647 .ops = &mhdp_ti_j721e_ops, 2648 }, 2649 }, 2650#endif 2651 { /* sentinel */ } 2652}; 2653MODULE_DEVICE_TABLE(of, mhdp_ids); 2654 2655static struct platform_driver mhdp_driver = { 2656 .driver = { 2657 .name = "cdns-mhdp8546", 2658 .of_match_table = mhdp_ids, 2659 }, 2660 .probe = cdns_mhdp_probe, 2661 .remove_new = cdns_mhdp_remove, 2662}; 2663module_platform_driver(mhdp_driver); 2664 2665MODULE_FIRMWARE(FW_NAME); 2666 2667MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); 2668MODULE_AUTHOR("Swapnil Jakhade <sjakhade@cadence.com>"); 2669MODULE_AUTHOR("Yuti Amonkar <yamonkar@cadence.com>"); 2670MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 2671MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>"); 2672MODULE_DESCRIPTION("Cadence MHDP8546 DP bridge driver"); 2673MODULE_LICENSE("GPL"); 2674MODULE_ALIAS("platform:cdns-mhdp8546"); 2675