1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2013 NVIDIA Corporation 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/delay.h> 8 #include <linux/interrupt.h> 9 #include <linux/io.h> 10 #include <linux/module.h> 11 #include <linux/of_device.h> 12 #include <linux/pinctrl/pinconf-generic.h> 13 #include <linux/pinctrl/pinctrl.h> 14 #include <linux/pinctrl/pinmux.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_runtime.h> 17 #include <linux/regulator/consumer.h> 18 #include <linux/reset.h> 19 #include <linux/workqueue.h> 20 21 #include <drm/display/drm_dp_helper.h> 22 #include <drm/display/drm_dp_aux_bus.h> 23 #include <drm/drm_panel.h> 24 25 #include "dp.h" 26 #include "dpaux.h" 27 #include "drm.h" 28 #include "trace.h" 29 30 static DEFINE_MUTEX(dpaux_lock); 31 static LIST_HEAD(dpaux_list); 32 33 struct tegra_dpaux_soc { 34 unsigned int cmh; 35 unsigned int drvz; 36 unsigned int drvi; 37 }; 38 39 struct tegra_dpaux { 40 struct drm_dp_aux aux; 41 struct device *dev; 42 43 const struct tegra_dpaux_soc *soc; 44 45 void __iomem *regs; 46 int irq; 47 48 struct tegra_output *output; 49 50 struct reset_control *rst; 51 struct clk *clk_parent; 52 struct clk *clk; 53 54 struct regulator *vdd; 55 56 struct completion complete; 57 struct work_struct work; 58 struct list_head list; 59 60 #ifdef CONFIG_GENERIC_PINCONF 61 struct pinctrl_dev *pinctrl; 62 struct pinctrl_desc desc; 63 #endif 64 }; 65 66 static inline struct tegra_dpaux *to_dpaux(struct drm_dp_aux *aux) 67 { 68 return container_of(aux, struct tegra_dpaux, aux); 69 } 70 71 static inline struct tegra_dpaux *work_to_dpaux(struct work_struct *work) 72 { 73 return container_of(work, struct tegra_dpaux, work); 74 } 75 76 static inline u32 tegra_dpaux_readl(struct tegra_dpaux *dpaux, 77 unsigned int offset) 78 { 79 u32 value = readl(dpaux->regs + (offset << 2)); 80 81 trace_dpaux_readl(dpaux->dev, offset, value); 82 83 return value; 84 } 85 86 static inline void tegra_dpaux_writel(struct tegra_dpaux *dpaux, 87 u32 value, unsigned int offset) 88 { 89 trace_dpaux_writel(dpaux->dev, offset, value); 90 writel(value, dpaux->regs + (offset << 2)); 91 } 92 93 static void tegra_dpaux_write_fifo(struct tegra_dpaux *dpaux, const u8 *buffer, 94 size_t size) 95 { 96 size_t i, j; 97 98 for (i = 0; i < DIV_ROUND_UP(size, 4); i++) { 99 size_t num = min_t(size_t, size - i * 4, 4); 100 u32 value = 0; 101 102 for (j = 0; j < num; j++) 103 value |= buffer[i * 4 + j] << (j * 8); 104 105 tegra_dpaux_writel(dpaux, value, DPAUX_DP_AUXDATA_WRITE(i)); 106 } 107 } 108 109 static void tegra_dpaux_read_fifo(struct tegra_dpaux *dpaux, u8 *buffer, 110 size_t size) 111 { 112 size_t i, j; 113 114 for (i = 0; i < DIV_ROUND_UP(size, 4); i++) { 115 size_t num = min_t(size_t, size - i * 4, 4); 116 u32 value; 117 118 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXDATA_READ(i)); 119 120 for (j = 0; j < num; j++) 121 buffer[i * 4 + j] = value >> (j * 8); 122 } 123 } 124 125 static ssize_t tegra_dpaux_transfer(struct drm_dp_aux *aux, 126 struct drm_dp_aux_msg *msg) 127 { 128 unsigned long timeout = msecs_to_jiffies(250); 129 struct tegra_dpaux *dpaux = to_dpaux(aux); 130 unsigned long status; 131 ssize_t ret = 0; 132 u8 reply = 0; 133 u32 value; 134 135 /* Tegra has 4x4 byte DP AUX transmit and receive FIFOs. */ 136 if (msg->size > 16) 137 return -EINVAL; 138 139 /* 140 * Allow zero-sized messages only for I2C, in which case they specify 141 * address-only transactions. 142 */ 143 if (msg->size < 1) { 144 switch (msg->request & ~DP_AUX_I2C_MOT) { 145 case DP_AUX_I2C_WRITE_STATUS_UPDATE: 146 case DP_AUX_I2C_WRITE: 147 case DP_AUX_I2C_READ: 148 value = DPAUX_DP_AUXCTL_CMD_ADDRESS_ONLY; 149 break; 150 151 default: 152 return -EINVAL; 153 } 154 } else { 155 /* For non-zero-sized messages, set the CMDLEN field. */ 156 value = DPAUX_DP_AUXCTL_CMDLEN(msg->size - 1); 157 } 158 159 switch (msg->request & ~DP_AUX_I2C_MOT) { 160 case DP_AUX_I2C_WRITE: 161 if (msg->request & DP_AUX_I2C_MOT) 162 value |= DPAUX_DP_AUXCTL_CMD_MOT_WR; 163 else 164 value |= DPAUX_DP_AUXCTL_CMD_I2C_WR; 165 166 break; 167 168 case DP_AUX_I2C_READ: 169 if (msg->request & DP_AUX_I2C_MOT) 170 value |= DPAUX_DP_AUXCTL_CMD_MOT_RD; 171 else 172 value |= DPAUX_DP_AUXCTL_CMD_I2C_RD; 173 174 break; 175 176 case DP_AUX_I2C_WRITE_STATUS_UPDATE: 177 if (msg->request & DP_AUX_I2C_MOT) 178 value |= DPAUX_DP_AUXCTL_CMD_MOT_RQ; 179 else 180 value |= DPAUX_DP_AUXCTL_CMD_I2C_RQ; 181 182 break; 183 184 case DP_AUX_NATIVE_WRITE: 185 value |= DPAUX_DP_AUXCTL_CMD_AUX_WR; 186 break; 187 188 case DP_AUX_NATIVE_READ: 189 value |= DPAUX_DP_AUXCTL_CMD_AUX_RD; 190 break; 191 192 default: 193 return -EINVAL; 194 } 195 196 tegra_dpaux_writel(dpaux, msg->address, DPAUX_DP_AUXADDR); 197 tegra_dpaux_writel(dpaux, value, DPAUX_DP_AUXCTL); 198 199 if ((msg->request & DP_AUX_I2C_READ) == 0) { 200 tegra_dpaux_write_fifo(dpaux, msg->buffer, msg->size); 201 ret = msg->size; 202 } 203 204 /* start transaction */ 205 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXCTL); 206 value |= DPAUX_DP_AUXCTL_TRANSACTREQ; 207 tegra_dpaux_writel(dpaux, value, DPAUX_DP_AUXCTL); 208 209 status = wait_for_completion_timeout(&dpaux->complete, timeout); 210 if (!status) 211 return -ETIMEDOUT; 212 213 /* read status and clear errors */ 214 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXSTAT); 215 tegra_dpaux_writel(dpaux, 0xf00, DPAUX_DP_AUXSTAT); 216 217 if (value & DPAUX_DP_AUXSTAT_TIMEOUT_ERROR) 218 return -ETIMEDOUT; 219 220 if ((value & DPAUX_DP_AUXSTAT_RX_ERROR) || 221 (value & DPAUX_DP_AUXSTAT_SINKSTAT_ERROR) || 222 (value & DPAUX_DP_AUXSTAT_NO_STOP_ERROR)) 223 return -EIO; 224 225 switch ((value & DPAUX_DP_AUXSTAT_REPLY_TYPE_MASK) >> 16) { 226 case 0x00: 227 reply = DP_AUX_NATIVE_REPLY_ACK; 228 break; 229 230 case 0x01: 231 reply = DP_AUX_NATIVE_REPLY_NACK; 232 break; 233 234 case 0x02: 235 reply = DP_AUX_NATIVE_REPLY_DEFER; 236 break; 237 238 case 0x04: 239 reply = DP_AUX_I2C_REPLY_NACK; 240 break; 241 242 case 0x08: 243 reply = DP_AUX_I2C_REPLY_DEFER; 244 break; 245 } 246 247 if ((msg->size > 0) && (msg->reply == DP_AUX_NATIVE_REPLY_ACK)) { 248 if (msg->request & DP_AUX_I2C_READ) { 249 size_t count = value & DPAUX_DP_AUXSTAT_REPLY_MASK; 250 251 /* 252 * There might be a smarter way to do this, but since 253 * the DP helpers will already retry transactions for 254 * an -EBUSY return value, simply reuse that instead. 255 */ 256 if (count != msg->size) { 257 ret = -EBUSY; 258 goto out; 259 } 260 261 tegra_dpaux_read_fifo(dpaux, msg->buffer, count); 262 ret = count; 263 } 264 } 265 266 msg->reply = reply; 267 268 out: 269 return ret; 270 } 271 272 static void tegra_dpaux_hotplug(struct work_struct *work) 273 { 274 struct tegra_dpaux *dpaux = work_to_dpaux(work); 275 276 if (dpaux->output) 277 drm_helper_hpd_irq_event(dpaux->output->connector.dev); 278 } 279 280 static irqreturn_t tegra_dpaux_irq(int irq, void *data) 281 { 282 struct tegra_dpaux *dpaux = data; 283 u32 value; 284 285 /* clear interrupts */ 286 value = tegra_dpaux_readl(dpaux, DPAUX_INTR_AUX); 287 tegra_dpaux_writel(dpaux, value, DPAUX_INTR_AUX); 288 289 if (value & (DPAUX_INTR_PLUG_EVENT | DPAUX_INTR_UNPLUG_EVENT)) 290 schedule_work(&dpaux->work); 291 292 if (value & DPAUX_INTR_IRQ_EVENT) { 293 /* TODO: handle this */ 294 } 295 296 if (value & DPAUX_INTR_AUX_DONE) 297 complete(&dpaux->complete); 298 299 return IRQ_HANDLED; 300 } 301 302 enum tegra_dpaux_functions { 303 DPAUX_PADCTL_FUNC_AUX, 304 DPAUX_PADCTL_FUNC_I2C, 305 DPAUX_PADCTL_FUNC_OFF, 306 }; 307 308 static void tegra_dpaux_pad_power_down(struct tegra_dpaux *dpaux) 309 { 310 u32 value = tegra_dpaux_readl(dpaux, DPAUX_HYBRID_SPARE); 311 312 value |= DPAUX_HYBRID_SPARE_PAD_POWER_DOWN; 313 314 tegra_dpaux_writel(dpaux, value, DPAUX_HYBRID_SPARE); 315 } 316 317 static void tegra_dpaux_pad_power_up(struct tegra_dpaux *dpaux) 318 { 319 u32 value = tegra_dpaux_readl(dpaux, DPAUX_HYBRID_SPARE); 320 321 value &= ~DPAUX_HYBRID_SPARE_PAD_POWER_DOWN; 322 323 tegra_dpaux_writel(dpaux, value, DPAUX_HYBRID_SPARE); 324 } 325 326 static int tegra_dpaux_pad_config(struct tegra_dpaux *dpaux, unsigned function) 327 { 328 u32 value; 329 330 switch (function) { 331 case DPAUX_PADCTL_FUNC_AUX: 332 value = DPAUX_HYBRID_PADCTL_AUX_CMH(dpaux->soc->cmh) | 333 DPAUX_HYBRID_PADCTL_AUX_DRVZ(dpaux->soc->drvz) | 334 DPAUX_HYBRID_PADCTL_AUX_DRVI(dpaux->soc->drvi) | 335 DPAUX_HYBRID_PADCTL_AUX_INPUT_RCV | 336 DPAUX_HYBRID_PADCTL_MODE_AUX; 337 break; 338 339 case DPAUX_PADCTL_FUNC_I2C: 340 value = DPAUX_HYBRID_PADCTL_I2C_SDA_INPUT_RCV | 341 DPAUX_HYBRID_PADCTL_I2C_SCL_INPUT_RCV | 342 DPAUX_HYBRID_PADCTL_AUX_CMH(dpaux->soc->cmh) | 343 DPAUX_HYBRID_PADCTL_AUX_DRVZ(dpaux->soc->drvz) | 344 DPAUX_HYBRID_PADCTL_AUX_DRVI(dpaux->soc->drvi) | 345 DPAUX_HYBRID_PADCTL_MODE_I2C; 346 break; 347 348 case DPAUX_PADCTL_FUNC_OFF: 349 tegra_dpaux_pad_power_down(dpaux); 350 return 0; 351 352 default: 353 return -ENOTSUPP; 354 } 355 356 tegra_dpaux_writel(dpaux, value, DPAUX_HYBRID_PADCTL); 357 tegra_dpaux_pad_power_up(dpaux); 358 359 return 0; 360 } 361 362 #ifdef CONFIG_GENERIC_PINCONF 363 static const struct pinctrl_pin_desc tegra_dpaux_pins[] = { 364 PINCTRL_PIN(0, "DP_AUX_CHx_P"), 365 PINCTRL_PIN(1, "DP_AUX_CHx_N"), 366 }; 367 368 static const unsigned tegra_dpaux_pin_numbers[] = { 0, 1 }; 369 370 static const char * const tegra_dpaux_groups[] = { 371 "dpaux-io", 372 }; 373 374 static const char * const tegra_dpaux_functions[] = { 375 "aux", 376 "i2c", 377 "off", 378 }; 379 380 static int tegra_dpaux_get_groups_count(struct pinctrl_dev *pinctrl) 381 { 382 return ARRAY_SIZE(tegra_dpaux_groups); 383 } 384 385 static const char *tegra_dpaux_get_group_name(struct pinctrl_dev *pinctrl, 386 unsigned int group) 387 { 388 return tegra_dpaux_groups[group]; 389 } 390 391 static int tegra_dpaux_get_group_pins(struct pinctrl_dev *pinctrl, 392 unsigned group, const unsigned **pins, 393 unsigned *num_pins) 394 { 395 *pins = tegra_dpaux_pin_numbers; 396 *num_pins = ARRAY_SIZE(tegra_dpaux_pin_numbers); 397 398 return 0; 399 } 400 401 static const struct pinctrl_ops tegra_dpaux_pinctrl_ops = { 402 .get_groups_count = tegra_dpaux_get_groups_count, 403 .get_group_name = tegra_dpaux_get_group_name, 404 .get_group_pins = tegra_dpaux_get_group_pins, 405 .dt_node_to_map = pinconf_generic_dt_node_to_map_group, 406 .dt_free_map = pinconf_generic_dt_free_map, 407 }; 408 409 static int tegra_dpaux_get_functions_count(struct pinctrl_dev *pinctrl) 410 { 411 return ARRAY_SIZE(tegra_dpaux_functions); 412 } 413 414 static const char *tegra_dpaux_get_function_name(struct pinctrl_dev *pinctrl, 415 unsigned int function) 416 { 417 return tegra_dpaux_functions[function]; 418 } 419 420 static int tegra_dpaux_get_function_groups(struct pinctrl_dev *pinctrl, 421 unsigned int function, 422 const char * const **groups, 423 unsigned * const num_groups) 424 { 425 *num_groups = ARRAY_SIZE(tegra_dpaux_groups); 426 *groups = tegra_dpaux_groups; 427 428 return 0; 429 } 430 431 static int tegra_dpaux_set_mux(struct pinctrl_dev *pinctrl, 432 unsigned int function, unsigned int group) 433 { 434 struct tegra_dpaux *dpaux = pinctrl_dev_get_drvdata(pinctrl); 435 436 return tegra_dpaux_pad_config(dpaux, function); 437 } 438 439 static const struct pinmux_ops tegra_dpaux_pinmux_ops = { 440 .get_functions_count = tegra_dpaux_get_functions_count, 441 .get_function_name = tegra_dpaux_get_function_name, 442 .get_function_groups = tegra_dpaux_get_function_groups, 443 .set_mux = tegra_dpaux_set_mux, 444 }; 445 #endif 446 447 static int tegra_dpaux_probe(struct platform_device *pdev) 448 { 449 struct tegra_dpaux *dpaux; 450 struct resource *regs; 451 u32 value; 452 int err; 453 454 dpaux = devm_kzalloc(&pdev->dev, sizeof(*dpaux), GFP_KERNEL); 455 if (!dpaux) 456 return -ENOMEM; 457 458 dpaux->soc = of_device_get_match_data(&pdev->dev); 459 INIT_WORK(&dpaux->work, tegra_dpaux_hotplug); 460 init_completion(&dpaux->complete); 461 INIT_LIST_HEAD(&dpaux->list); 462 dpaux->dev = &pdev->dev; 463 464 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 465 dpaux->regs = devm_ioremap_resource(&pdev->dev, regs); 466 if (IS_ERR(dpaux->regs)) 467 return PTR_ERR(dpaux->regs); 468 469 dpaux->irq = platform_get_irq(pdev, 0); 470 if (dpaux->irq < 0) 471 return -ENXIO; 472 473 if (!pdev->dev.pm_domain) { 474 dpaux->rst = devm_reset_control_get(&pdev->dev, "dpaux"); 475 if (IS_ERR(dpaux->rst)) { 476 dev_err(&pdev->dev, 477 "failed to get reset control: %ld\n", 478 PTR_ERR(dpaux->rst)); 479 return PTR_ERR(dpaux->rst); 480 } 481 } 482 483 dpaux->clk = devm_clk_get(&pdev->dev, NULL); 484 if (IS_ERR(dpaux->clk)) { 485 dev_err(&pdev->dev, "failed to get module clock: %ld\n", 486 PTR_ERR(dpaux->clk)); 487 return PTR_ERR(dpaux->clk); 488 } 489 490 dpaux->clk_parent = devm_clk_get(&pdev->dev, "parent"); 491 if (IS_ERR(dpaux->clk_parent)) { 492 dev_err(&pdev->dev, "failed to get parent clock: %ld\n", 493 PTR_ERR(dpaux->clk_parent)); 494 return PTR_ERR(dpaux->clk_parent); 495 } 496 497 err = clk_set_rate(dpaux->clk_parent, 270000000); 498 if (err < 0) { 499 dev_err(&pdev->dev, "failed to set clock to 270 MHz: %d\n", 500 err); 501 return err; 502 } 503 504 dpaux->vdd = devm_regulator_get_optional(&pdev->dev, "vdd"); 505 if (IS_ERR(dpaux->vdd)) { 506 if (PTR_ERR(dpaux->vdd) != -ENODEV) { 507 if (PTR_ERR(dpaux->vdd) != -EPROBE_DEFER) 508 dev_err(&pdev->dev, 509 "failed to get VDD supply: %ld\n", 510 PTR_ERR(dpaux->vdd)); 511 512 return PTR_ERR(dpaux->vdd); 513 } 514 515 dpaux->vdd = NULL; 516 } 517 518 platform_set_drvdata(pdev, dpaux); 519 pm_runtime_enable(&pdev->dev); 520 pm_runtime_get_sync(&pdev->dev); 521 522 err = devm_request_irq(dpaux->dev, dpaux->irq, tegra_dpaux_irq, 0, 523 dev_name(dpaux->dev), dpaux); 524 if (err < 0) { 525 dev_err(dpaux->dev, "failed to request IRQ#%u: %d\n", 526 dpaux->irq, err); 527 return err; 528 } 529 530 disable_irq(dpaux->irq); 531 532 dpaux->aux.transfer = tegra_dpaux_transfer; 533 dpaux->aux.dev = &pdev->dev; 534 535 drm_dp_aux_init(&dpaux->aux); 536 537 /* 538 * Assume that by default the DPAUX/I2C pads will be used for HDMI, 539 * so power them up and configure them in I2C mode. 540 * 541 * The DPAUX code paths reconfigure the pads in AUX mode, but there 542 * is no possibility to perform the I2C mode configuration in the 543 * HDMI path. 544 */ 545 err = tegra_dpaux_pad_config(dpaux, DPAUX_PADCTL_FUNC_I2C); 546 if (err < 0) 547 return err; 548 549 #ifdef CONFIG_GENERIC_PINCONF 550 dpaux->desc.name = dev_name(&pdev->dev); 551 dpaux->desc.pins = tegra_dpaux_pins; 552 dpaux->desc.npins = ARRAY_SIZE(tegra_dpaux_pins); 553 dpaux->desc.pctlops = &tegra_dpaux_pinctrl_ops; 554 dpaux->desc.pmxops = &tegra_dpaux_pinmux_ops; 555 dpaux->desc.owner = THIS_MODULE; 556 557 dpaux->pinctrl = devm_pinctrl_register(&pdev->dev, &dpaux->desc, dpaux); 558 if (IS_ERR(dpaux->pinctrl)) { 559 dev_err(&pdev->dev, "failed to register pincontrol\n"); 560 return PTR_ERR(dpaux->pinctrl); 561 } 562 #endif 563 /* enable and clear all interrupts */ 564 value = DPAUX_INTR_AUX_DONE | DPAUX_INTR_IRQ_EVENT | 565 DPAUX_INTR_UNPLUG_EVENT | DPAUX_INTR_PLUG_EVENT; 566 tegra_dpaux_writel(dpaux, value, DPAUX_INTR_EN_AUX); 567 tegra_dpaux_writel(dpaux, value, DPAUX_INTR_AUX); 568 569 mutex_lock(&dpaux_lock); 570 list_add_tail(&dpaux->list, &dpaux_list); 571 mutex_unlock(&dpaux_lock); 572 573 err = devm_of_dp_aux_populate_ep_devices(&dpaux->aux); 574 if (err < 0) { 575 dev_err(dpaux->dev, "failed to populate AUX bus: %d\n", err); 576 return err; 577 } 578 579 return 0; 580 } 581 582 static int tegra_dpaux_remove(struct platform_device *pdev) 583 { 584 struct tegra_dpaux *dpaux = platform_get_drvdata(pdev); 585 586 cancel_work_sync(&dpaux->work); 587 588 /* make sure pads are powered down when not in use */ 589 tegra_dpaux_pad_power_down(dpaux); 590 591 pm_runtime_put_sync(&pdev->dev); 592 pm_runtime_disable(&pdev->dev); 593 594 mutex_lock(&dpaux_lock); 595 list_del(&dpaux->list); 596 mutex_unlock(&dpaux_lock); 597 598 return 0; 599 } 600 601 static int tegra_dpaux_suspend(struct device *dev) 602 { 603 struct tegra_dpaux *dpaux = dev_get_drvdata(dev); 604 int err = 0; 605 606 if (dpaux->rst) { 607 err = reset_control_assert(dpaux->rst); 608 if (err < 0) { 609 dev_err(dev, "failed to assert reset: %d\n", err); 610 return err; 611 } 612 } 613 614 usleep_range(1000, 2000); 615 616 clk_disable_unprepare(dpaux->clk_parent); 617 clk_disable_unprepare(dpaux->clk); 618 619 return err; 620 } 621 622 static int tegra_dpaux_resume(struct device *dev) 623 { 624 struct tegra_dpaux *dpaux = dev_get_drvdata(dev); 625 int err; 626 627 err = clk_prepare_enable(dpaux->clk); 628 if (err < 0) { 629 dev_err(dev, "failed to enable clock: %d\n", err); 630 return err; 631 } 632 633 err = clk_prepare_enable(dpaux->clk_parent); 634 if (err < 0) { 635 dev_err(dev, "failed to enable parent clock: %d\n", err); 636 goto disable_clk; 637 } 638 639 usleep_range(1000, 2000); 640 641 if (dpaux->rst) { 642 err = reset_control_deassert(dpaux->rst); 643 if (err < 0) { 644 dev_err(dev, "failed to deassert reset: %d\n", err); 645 goto disable_parent; 646 } 647 648 usleep_range(1000, 2000); 649 } 650 651 return 0; 652 653 disable_parent: 654 clk_disable_unprepare(dpaux->clk_parent); 655 disable_clk: 656 clk_disable_unprepare(dpaux->clk); 657 return err; 658 } 659 660 static const struct dev_pm_ops tegra_dpaux_pm_ops = { 661 RUNTIME_PM_OPS(tegra_dpaux_suspend, tegra_dpaux_resume, NULL) 662 }; 663 664 static const struct tegra_dpaux_soc tegra124_dpaux_soc = { 665 .cmh = 0x02, 666 .drvz = 0x04, 667 .drvi = 0x18, 668 }; 669 670 static const struct tegra_dpaux_soc tegra210_dpaux_soc = { 671 .cmh = 0x02, 672 .drvz = 0x04, 673 .drvi = 0x30, 674 }; 675 676 static const struct tegra_dpaux_soc tegra194_dpaux_soc = { 677 .cmh = 0x02, 678 .drvz = 0x04, 679 .drvi = 0x2c, 680 }; 681 682 static const struct of_device_id tegra_dpaux_of_match[] = { 683 { .compatible = "nvidia,tegra194-dpaux", .data = &tegra194_dpaux_soc }, 684 { .compatible = "nvidia,tegra186-dpaux", .data = &tegra210_dpaux_soc }, 685 { .compatible = "nvidia,tegra210-dpaux", .data = &tegra210_dpaux_soc }, 686 { .compatible = "nvidia,tegra124-dpaux", .data = &tegra124_dpaux_soc }, 687 { }, 688 }; 689 MODULE_DEVICE_TABLE(of, tegra_dpaux_of_match); 690 691 struct platform_driver tegra_dpaux_driver = { 692 .driver = { 693 .name = "tegra-dpaux", 694 .of_match_table = tegra_dpaux_of_match, 695 .pm = pm_ptr(&tegra_dpaux_pm_ops), 696 }, 697 .probe = tegra_dpaux_probe, 698 .remove = tegra_dpaux_remove, 699 }; 700 701 struct drm_dp_aux *drm_dp_aux_find_by_of_node(struct device_node *np) 702 { 703 struct tegra_dpaux *dpaux; 704 705 mutex_lock(&dpaux_lock); 706 707 list_for_each_entry(dpaux, &dpaux_list, list) 708 if (np == dpaux->dev->of_node) { 709 mutex_unlock(&dpaux_lock); 710 return &dpaux->aux; 711 } 712 713 mutex_unlock(&dpaux_lock); 714 715 return NULL; 716 } 717 718 int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output) 719 { 720 struct tegra_dpaux *dpaux = to_dpaux(aux); 721 unsigned long timeout; 722 int err; 723 724 aux->drm_dev = output->connector.dev; 725 err = drm_dp_aux_register(aux); 726 if (err < 0) 727 return err; 728 729 output->connector.polled = DRM_CONNECTOR_POLL_HPD; 730 dpaux->output = output; 731 732 if (output->panel) { 733 enum drm_connector_status status; 734 735 if (dpaux->vdd) { 736 err = regulator_enable(dpaux->vdd); 737 if (err < 0) 738 return err; 739 } 740 741 timeout = jiffies + msecs_to_jiffies(250); 742 743 while (time_before(jiffies, timeout)) { 744 status = drm_dp_aux_detect(aux); 745 746 if (status == connector_status_connected) 747 break; 748 749 usleep_range(1000, 2000); 750 } 751 752 if (status != connector_status_connected) 753 return -ETIMEDOUT; 754 } 755 756 enable_irq(dpaux->irq); 757 return 0; 758 } 759 760 int drm_dp_aux_detach(struct drm_dp_aux *aux) 761 { 762 struct tegra_dpaux *dpaux = to_dpaux(aux); 763 unsigned long timeout; 764 int err; 765 766 drm_dp_aux_unregister(aux); 767 disable_irq(dpaux->irq); 768 769 if (dpaux->output->panel) { 770 enum drm_connector_status status; 771 772 if (dpaux->vdd) { 773 err = regulator_disable(dpaux->vdd); 774 if (err < 0) 775 return err; 776 } 777 778 timeout = jiffies + msecs_to_jiffies(250); 779 780 while (time_before(jiffies, timeout)) { 781 status = drm_dp_aux_detect(aux); 782 783 if (status == connector_status_disconnected) 784 break; 785 786 usleep_range(1000, 2000); 787 } 788 789 if (status != connector_status_disconnected) 790 return -ETIMEDOUT; 791 792 dpaux->output = NULL; 793 } 794 795 return 0; 796 } 797 798 enum drm_connector_status drm_dp_aux_detect(struct drm_dp_aux *aux) 799 { 800 struct tegra_dpaux *dpaux = to_dpaux(aux); 801 u32 value; 802 803 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXSTAT); 804 805 if (value & DPAUX_DP_AUXSTAT_HPD_STATUS) 806 return connector_status_connected; 807 808 return connector_status_disconnected; 809 } 810 811 int drm_dp_aux_enable(struct drm_dp_aux *aux) 812 { 813 struct tegra_dpaux *dpaux = to_dpaux(aux); 814 815 return tegra_dpaux_pad_config(dpaux, DPAUX_PADCTL_FUNC_AUX); 816 } 817 818 int drm_dp_aux_disable(struct drm_dp_aux *aux) 819 { 820 struct tegra_dpaux *dpaux = to_dpaux(aux); 821 822 tegra_dpaux_pad_power_down(dpaux); 823 824 return 0; 825 } 826