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/drm_dp_helper.h>
22 #include <drm/drm_panel.h>
23
24 #include "dp.h"
25 #include "dpaux.h"
26 #include "drm.h"
27 #include "trace.h"
28
29 static DEFINE_MUTEX(dpaux_lock);
30 static LIST_HEAD(dpaux_list);
31
32 struct tegra_dpaux_soc {
33 unsigned int cmh;
34 unsigned int drvz;
35 unsigned int drvi;
36 };
37
38 struct tegra_dpaux {
39 struct drm_dp_aux aux;
40 struct device *dev;
41
42 const struct tegra_dpaux_soc *soc;
43
44 void __iomem *regs;
45 int irq;
46
47 struct tegra_output *output;
48
49 struct reset_control *rst;
50 struct clk *clk_parent;
51 struct clk *clk;
52
53 struct regulator *vdd;
54
55 struct completion complete;
56 struct work_struct work;
57 struct list_head list;
58
59 #ifdef CONFIG_GENERIC_PINCONF
60 struct pinctrl_dev *pinctrl;
61 struct pinctrl_desc desc;
62 #endif
63 };
64
to_dpaux(struct drm_dp_aux * aux)65 static inline struct tegra_dpaux *to_dpaux(struct drm_dp_aux *aux)
66 {
67 return container_of(aux, struct tegra_dpaux, aux);
68 }
69
work_to_dpaux(struct work_struct * work)70 static inline struct tegra_dpaux *work_to_dpaux(struct work_struct *work)
71 {
72 return container_of(work, struct tegra_dpaux, work);
73 }
74
tegra_dpaux_readl(struct tegra_dpaux * dpaux,unsigned int offset)75 static inline u32 tegra_dpaux_readl(struct tegra_dpaux *dpaux,
76 unsigned int offset)
77 {
78 u32 value = readl(dpaux->regs + (offset << 2));
79
80 trace_dpaux_readl(dpaux->dev, offset, value);
81
82 return value;
83 }
84
tegra_dpaux_writel(struct tegra_dpaux * dpaux,u32 value,unsigned int offset)85 static inline void tegra_dpaux_writel(struct tegra_dpaux *dpaux,
86 u32 value, unsigned int offset)
87 {
88 trace_dpaux_writel(dpaux->dev, offset, value);
89 writel(value, dpaux->regs + (offset << 2));
90 }
91
tegra_dpaux_write_fifo(struct tegra_dpaux * dpaux,const u8 * buffer,size_t size)92 static void tegra_dpaux_write_fifo(struct tegra_dpaux *dpaux, const u8 *buffer,
93 size_t size)
94 {
95 size_t i, j;
96
97 for (i = 0; i < DIV_ROUND_UP(size, 4); i++) {
98 size_t num = min_t(size_t, size - i * 4, 4);
99 u32 value = 0;
100
101 for (j = 0; j < num; j++)
102 value |= buffer[i * 4 + j] << (j * 8);
103
104 tegra_dpaux_writel(dpaux, value, DPAUX_DP_AUXDATA_WRITE(i));
105 }
106 }
107
tegra_dpaux_read_fifo(struct tegra_dpaux * dpaux,u8 * buffer,size_t size)108 static void tegra_dpaux_read_fifo(struct tegra_dpaux *dpaux, u8 *buffer,
109 size_t size)
110 {
111 size_t i, j;
112
113 for (i = 0; i < DIV_ROUND_UP(size, 4); i++) {
114 size_t num = min_t(size_t, size - i * 4, 4);
115 u32 value;
116
117 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXDATA_READ(i));
118
119 for (j = 0; j < num; j++)
120 buffer[i * 4 + j] = value >> (j * 8);
121 }
122 }
123
tegra_dpaux_transfer(struct drm_dp_aux * aux,struct drm_dp_aux_msg * msg)124 static ssize_t tegra_dpaux_transfer(struct drm_dp_aux *aux,
125 struct drm_dp_aux_msg *msg)
126 {
127 unsigned long timeout = msecs_to_jiffies(250);
128 struct tegra_dpaux *dpaux = to_dpaux(aux);
129 unsigned long status;
130 ssize_t ret = 0;
131 u8 reply = 0;
132 u32 value;
133
134 /* Tegra has 4x4 byte DP AUX transmit and receive FIFOs. */
135 if (msg->size > 16)
136 return -EINVAL;
137
138 /*
139 * Allow zero-sized messages only for I2C, in which case they specify
140 * address-only transactions.
141 */
142 if (msg->size < 1) {
143 switch (msg->request & ~DP_AUX_I2C_MOT) {
144 case DP_AUX_I2C_WRITE_STATUS_UPDATE:
145 case DP_AUX_I2C_WRITE:
146 case DP_AUX_I2C_READ:
147 value = DPAUX_DP_AUXCTL_CMD_ADDRESS_ONLY;
148 break;
149
150 default:
151 return -EINVAL;
152 }
153 } else {
154 /* For non-zero-sized messages, set the CMDLEN field. */
155 value = DPAUX_DP_AUXCTL_CMDLEN(msg->size - 1);
156 }
157
158 switch (msg->request & ~DP_AUX_I2C_MOT) {
159 case DP_AUX_I2C_WRITE:
160 if (msg->request & DP_AUX_I2C_MOT)
161 value |= DPAUX_DP_AUXCTL_CMD_MOT_WR;
162 else
163 value |= DPAUX_DP_AUXCTL_CMD_I2C_WR;
164
165 break;
166
167 case DP_AUX_I2C_READ:
168 if (msg->request & DP_AUX_I2C_MOT)
169 value |= DPAUX_DP_AUXCTL_CMD_MOT_RD;
170 else
171 value |= DPAUX_DP_AUXCTL_CMD_I2C_RD;
172
173 break;
174
175 case DP_AUX_I2C_WRITE_STATUS_UPDATE:
176 if (msg->request & DP_AUX_I2C_MOT)
177 value |= DPAUX_DP_AUXCTL_CMD_MOT_RQ;
178 else
179 value |= DPAUX_DP_AUXCTL_CMD_I2C_RQ;
180
181 break;
182
183 case DP_AUX_NATIVE_WRITE:
184 value |= DPAUX_DP_AUXCTL_CMD_AUX_WR;
185 break;
186
187 case DP_AUX_NATIVE_READ:
188 value |= DPAUX_DP_AUXCTL_CMD_AUX_RD;
189 break;
190
191 default:
192 return -EINVAL;
193 }
194
195 tegra_dpaux_writel(dpaux, msg->address, DPAUX_DP_AUXADDR);
196 tegra_dpaux_writel(dpaux, value, DPAUX_DP_AUXCTL);
197
198 if ((msg->request & DP_AUX_I2C_READ) == 0) {
199 tegra_dpaux_write_fifo(dpaux, msg->buffer, msg->size);
200 ret = msg->size;
201 }
202
203 /* start transaction */
204 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXCTL);
205 value |= DPAUX_DP_AUXCTL_TRANSACTREQ;
206 tegra_dpaux_writel(dpaux, value, DPAUX_DP_AUXCTL);
207
208 status = wait_for_completion_timeout(&dpaux->complete, timeout);
209 if (!status)
210 return -ETIMEDOUT;
211
212 /* read status and clear errors */
213 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXSTAT);
214 tegra_dpaux_writel(dpaux, 0xf00, DPAUX_DP_AUXSTAT);
215
216 if (value & DPAUX_DP_AUXSTAT_TIMEOUT_ERROR)
217 return -ETIMEDOUT;
218
219 if ((value & DPAUX_DP_AUXSTAT_RX_ERROR) ||
220 (value & DPAUX_DP_AUXSTAT_SINKSTAT_ERROR) ||
221 (value & DPAUX_DP_AUXSTAT_NO_STOP_ERROR))
222 return -EIO;
223
224 switch ((value & DPAUX_DP_AUXSTAT_REPLY_TYPE_MASK) >> 16) {
225 case 0x00:
226 reply = DP_AUX_NATIVE_REPLY_ACK;
227 break;
228
229 case 0x01:
230 reply = DP_AUX_NATIVE_REPLY_NACK;
231 break;
232
233 case 0x02:
234 reply = DP_AUX_NATIVE_REPLY_DEFER;
235 break;
236
237 case 0x04:
238 reply = DP_AUX_I2C_REPLY_NACK;
239 break;
240
241 case 0x08:
242 reply = DP_AUX_I2C_REPLY_DEFER;
243 break;
244 }
245
246 if ((msg->size > 0) && (msg->reply == DP_AUX_NATIVE_REPLY_ACK)) {
247 if (msg->request & DP_AUX_I2C_READ) {
248 size_t count = value & DPAUX_DP_AUXSTAT_REPLY_MASK;
249
250 /*
251 * There might be a smarter way to do this, but since
252 * the DP helpers will already retry transactions for
253 * an -EBUSY return value, simply reuse that instead.
254 */
255 if (count != msg->size) {
256 ret = -EBUSY;
257 goto out;
258 }
259
260 tegra_dpaux_read_fifo(dpaux, msg->buffer, count);
261 ret = count;
262 }
263 }
264
265 msg->reply = reply;
266
267 out:
268 return ret;
269 }
270
tegra_dpaux_hotplug(struct work_struct * work)271 static void tegra_dpaux_hotplug(struct work_struct *work)
272 {
273 struct tegra_dpaux *dpaux = work_to_dpaux(work);
274
275 if (dpaux->output)
276 drm_helper_hpd_irq_event(dpaux->output->connector.dev);
277 }
278
tegra_dpaux_irq(int irq,void * data)279 static irqreturn_t tegra_dpaux_irq(int irq, void *data)
280 {
281 struct tegra_dpaux *dpaux = data;
282 irqreturn_t ret = IRQ_HANDLED;
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 ret;
300 }
301
302 enum tegra_dpaux_functions {
303 DPAUX_PADCTL_FUNC_AUX,
304 DPAUX_PADCTL_FUNC_I2C,
305 DPAUX_PADCTL_FUNC_OFF,
306 };
307
tegra_dpaux_pad_power_down(struct tegra_dpaux * dpaux)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
tegra_dpaux_pad_power_up(struct tegra_dpaux * dpaux)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
tegra_dpaux_pad_config(struct tegra_dpaux * dpaux,unsigned function)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
tegra_dpaux_get_groups_count(struct pinctrl_dev * pinctrl)380 static int tegra_dpaux_get_groups_count(struct pinctrl_dev *pinctrl)
381 {
382 return ARRAY_SIZE(tegra_dpaux_groups);
383 }
384
tegra_dpaux_get_group_name(struct pinctrl_dev * pinctrl,unsigned int group)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
tegra_dpaux_get_group_pins(struct pinctrl_dev * pinctrl,unsigned group,const unsigned ** pins,unsigned * num_pins)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
tegra_dpaux_get_functions_count(struct pinctrl_dev * pinctrl)409 static int tegra_dpaux_get_functions_count(struct pinctrl_dev *pinctrl)
410 {
411 return ARRAY_SIZE(tegra_dpaux_functions);
412 }
413
tegra_dpaux_get_function_name(struct pinctrl_dev * pinctrl,unsigned int function)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
tegra_dpaux_get_function_groups(struct pinctrl_dev * pinctrl,unsigned int function,const char * const ** groups,unsigned * const num_groups)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
tegra_dpaux_set_mux(struct pinctrl_dev * pinctrl,unsigned int function,unsigned int group)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
tegra_dpaux_probe(struct platform_device * pdev)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 dev_err(&pdev->dev, "failed to get IRQ\n");
472 return -ENXIO;
473 }
474
475 if (!pdev->dev.pm_domain) {
476 dpaux->rst = devm_reset_control_get(&pdev->dev, "dpaux");
477 if (IS_ERR(dpaux->rst)) {
478 dev_err(&pdev->dev,
479 "failed to get reset control: %ld\n",
480 PTR_ERR(dpaux->rst));
481 return PTR_ERR(dpaux->rst);
482 }
483 }
484
485 dpaux->clk = devm_clk_get(&pdev->dev, NULL);
486 if (IS_ERR(dpaux->clk)) {
487 dev_err(&pdev->dev, "failed to get module clock: %ld\n",
488 PTR_ERR(dpaux->clk));
489 return PTR_ERR(dpaux->clk);
490 }
491
492 dpaux->clk_parent = devm_clk_get(&pdev->dev, "parent");
493 if (IS_ERR(dpaux->clk_parent)) {
494 dev_err(&pdev->dev, "failed to get parent clock: %ld\n",
495 PTR_ERR(dpaux->clk_parent));
496 return PTR_ERR(dpaux->clk_parent);
497 }
498
499 err = clk_set_rate(dpaux->clk_parent, 270000000);
500 if (err < 0) {
501 dev_err(&pdev->dev, "failed to set clock to 270 MHz: %d\n",
502 err);
503 return err;
504 }
505
506 dpaux->vdd = devm_regulator_get_optional(&pdev->dev, "vdd");
507 if (IS_ERR(dpaux->vdd)) {
508 if (PTR_ERR(dpaux->vdd) != -ENODEV) {
509 if (PTR_ERR(dpaux->vdd) != -EPROBE_DEFER)
510 dev_err(&pdev->dev,
511 "failed to get VDD supply: %ld\n",
512 PTR_ERR(dpaux->vdd));
513
514 return PTR_ERR(dpaux->vdd);
515 }
516
517 dpaux->vdd = NULL;
518 }
519
520 platform_set_drvdata(pdev, dpaux);
521 pm_runtime_enable(&pdev->dev);
522 pm_runtime_get_sync(&pdev->dev);
523
524 err = devm_request_irq(dpaux->dev, dpaux->irq, tegra_dpaux_irq, 0,
525 dev_name(dpaux->dev), dpaux);
526 if (err < 0) {
527 dev_err(dpaux->dev, "failed to request IRQ#%u: %d\n",
528 dpaux->irq, err);
529 return err;
530 }
531
532 disable_irq(dpaux->irq);
533
534 dpaux->aux.transfer = tegra_dpaux_transfer;
535 dpaux->aux.dev = &pdev->dev;
536
537 err = drm_dp_aux_register(&dpaux->aux);
538 if (err < 0)
539 return err;
540
541 /*
542 * Assume that by default the DPAUX/I2C pads will be used for HDMI,
543 * so power them up and configure them in I2C mode.
544 *
545 * The DPAUX code paths reconfigure the pads in AUX mode, but there
546 * is no possibility to perform the I2C mode configuration in the
547 * HDMI path.
548 */
549 err = tegra_dpaux_pad_config(dpaux, DPAUX_PADCTL_FUNC_I2C);
550 if (err < 0)
551 return err;
552
553 #ifdef CONFIG_GENERIC_PINCONF
554 dpaux->desc.name = dev_name(&pdev->dev);
555 dpaux->desc.pins = tegra_dpaux_pins;
556 dpaux->desc.npins = ARRAY_SIZE(tegra_dpaux_pins);
557 dpaux->desc.pctlops = &tegra_dpaux_pinctrl_ops;
558 dpaux->desc.pmxops = &tegra_dpaux_pinmux_ops;
559 dpaux->desc.owner = THIS_MODULE;
560
561 dpaux->pinctrl = devm_pinctrl_register(&pdev->dev, &dpaux->desc, dpaux);
562 if (IS_ERR(dpaux->pinctrl)) {
563 dev_err(&pdev->dev, "failed to register pincontrol\n");
564 return PTR_ERR(dpaux->pinctrl);
565 }
566 #endif
567 /* enable and clear all interrupts */
568 value = DPAUX_INTR_AUX_DONE | DPAUX_INTR_IRQ_EVENT |
569 DPAUX_INTR_UNPLUG_EVENT | DPAUX_INTR_PLUG_EVENT;
570 tegra_dpaux_writel(dpaux, value, DPAUX_INTR_EN_AUX);
571 tegra_dpaux_writel(dpaux, value, DPAUX_INTR_AUX);
572
573 mutex_lock(&dpaux_lock);
574 list_add_tail(&dpaux->list, &dpaux_list);
575 mutex_unlock(&dpaux_lock);
576
577 return 0;
578 }
579
tegra_dpaux_remove(struct platform_device * pdev)580 static int tegra_dpaux_remove(struct platform_device *pdev)
581 {
582 struct tegra_dpaux *dpaux = platform_get_drvdata(pdev);
583
584 cancel_work_sync(&dpaux->work);
585
586 /* make sure pads are powered down when not in use */
587 tegra_dpaux_pad_power_down(dpaux);
588
589 pm_runtime_put_sync(&pdev->dev);
590 pm_runtime_disable(&pdev->dev);
591
592 drm_dp_aux_unregister(&dpaux->aux);
593
594 mutex_lock(&dpaux_lock);
595 list_del(&dpaux->list);
596 mutex_unlock(&dpaux_lock);
597
598 return 0;
599 }
600
601 #ifdef CONFIG_PM
tegra_dpaux_suspend(struct device * dev)602 static int tegra_dpaux_suspend(struct device *dev)
603 {
604 struct tegra_dpaux *dpaux = dev_get_drvdata(dev);
605 int err = 0;
606
607 if (dpaux->rst) {
608 err = reset_control_assert(dpaux->rst);
609 if (err < 0) {
610 dev_err(dev, "failed to assert reset: %d\n", err);
611 return err;
612 }
613 }
614
615 usleep_range(1000, 2000);
616
617 clk_disable_unprepare(dpaux->clk_parent);
618 clk_disable_unprepare(dpaux->clk);
619
620 return err;
621 }
622
tegra_dpaux_resume(struct device * dev)623 static int tegra_dpaux_resume(struct device *dev)
624 {
625 struct tegra_dpaux *dpaux = dev_get_drvdata(dev);
626 int err;
627
628 err = clk_prepare_enable(dpaux->clk);
629 if (err < 0) {
630 dev_err(dev, "failed to enable clock: %d\n", err);
631 return err;
632 }
633
634 err = clk_prepare_enable(dpaux->clk_parent);
635 if (err < 0) {
636 dev_err(dev, "failed to enable parent clock: %d\n", err);
637 goto disable_clk;
638 }
639
640 usleep_range(1000, 2000);
641
642 if (dpaux->rst) {
643 err = reset_control_deassert(dpaux->rst);
644 if (err < 0) {
645 dev_err(dev, "failed to deassert reset: %d\n", err);
646 goto disable_parent;
647 }
648
649 usleep_range(1000, 2000);
650 }
651
652 return 0;
653
654 disable_parent:
655 clk_disable_unprepare(dpaux->clk_parent);
656 disable_clk:
657 clk_disable_unprepare(dpaux->clk);
658 return err;
659 }
660 #endif
661
662 static const struct dev_pm_ops tegra_dpaux_pm_ops = {
663 SET_RUNTIME_PM_OPS(tegra_dpaux_suspend, tegra_dpaux_resume, NULL)
664 };
665
666 static const struct tegra_dpaux_soc tegra124_dpaux_soc = {
667 .cmh = 0x02,
668 .drvz = 0x04,
669 .drvi = 0x18,
670 };
671
672 static const struct tegra_dpaux_soc tegra210_dpaux_soc = {
673 .cmh = 0x02,
674 .drvz = 0x04,
675 .drvi = 0x30,
676 };
677
678 static const struct tegra_dpaux_soc tegra194_dpaux_soc = {
679 .cmh = 0x02,
680 .drvz = 0x04,
681 .drvi = 0x2c,
682 };
683
684 static const struct of_device_id tegra_dpaux_of_match[] = {
685 { .compatible = "nvidia,tegra194-dpaux", .data = &tegra194_dpaux_soc },
686 { .compatible = "nvidia,tegra186-dpaux", .data = &tegra210_dpaux_soc },
687 { .compatible = "nvidia,tegra210-dpaux", .data = &tegra210_dpaux_soc },
688 { .compatible = "nvidia,tegra124-dpaux", .data = &tegra124_dpaux_soc },
689 { },
690 };
691 MODULE_DEVICE_TABLE(of, tegra_dpaux_of_match);
692
693 struct platform_driver tegra_dpaux_driver = {
694 .driver = {
695 .name = "tegra-dpaux",
696 .of_match_table = tegra_dpaux_of_match,
697 .pm = &tegra_dpaux_pm_ops,
698 },
699 .probe = tegra_dpaux_probe,
700 .remove = tegra_dpaux_remove,
701 };
702
drm_dp_aux_find_by_of_node(struct device_node * np)703 struct drm_dp_aux *drm_dp_aux_find_by_of_node(struct device_node *np)
704 {
705 struct tegra_dpaux *dpaux;
706
707 mutex_lock(&dpaux_lock);
708
709 list_for_each_entry(dpaux, &dpaux_list, list)
710 if (np == dpaux->dev->of_node) {
711 mutex_unlock(&dpaux_lock);
712 return &dpaux->aux;
713 }
714
715 mutex_unlock(&dpaux_lock);
716
717 return NULL;
718 }
719
drm_dp_aux_attach(struct drm_dp_aux * aux,struct tegra_output * output)720 int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output)
721 {
722 struct tegra_dpaux *dpaux = to_dpaux(aux);
723 unsigned long timeout;
724 int err;
725
726 output->connector.polled = DRM_CONNECTOR_POLL_HPD;
727 dpaux->output = output;
728
729 if (output->panel) {
730 enum drm_connector_status status;
731
732 if (dpaux->vdd) {
733 err = regulator_enable(dpaux->vdd);
734 if (err < 0)
735 return err;
736 }
737
738 timeout = jiffies + msecs_to_jiffies(250);
739
740 while (time_before(jiffies, timeout)) {
741 status = drm_dp_aux_detect(aux);
742
743 if (status == connector_status_connected)
744 break;
745
746 usleep_range(1000, 2000);
747 }
748
749 if (status != connector_status_connected)
750 return -ETIMEDOUT;
751 }
752
753 enable_irq(dpaux->irq);
754 return 0;
755 }
756
drm_dp_aux_detach(struct drm_dp_aux * aux)757 int drm_dp_aux_detach(struct drm_dp_aux *aux)
758 {
759 struct tegra_dpaux *dpaux = to_dpaux(aux);
760 unsigned long timeout;
761 int err;
762
763 disable_irq(dpaux->irq);
764
765 if (dpaux->output->panel) {
766 enum drm_connector_status status;
767
768 if (dpaux->vdd) {
769 err = regulator_disable(dpaux->vdd);
770 if (err < 0)
771 return err;
772 }
773
774 timeout = jiffies + msecs_to_jiffies(250);
775
776 while (time_before(jiffies, timeout)) {
777 status = drm_dp_aux_detect(aux);
778
779 if (status == connector_status_disconnected)
780 break;
781
782 usleep_range(1000, 2000);
783 }
784
785 if (status != connector_status_disconnected)
786 return -ETIMEDOUT;
787
788 dpaux->output = NULL;
789 }
790
791 return 0;
792 }
793
drm_dp_aux_detect(struct drm_dp_aux * aux)794 enum drm_connector_status drm_dp_aux_detect(struct drm_dp_aux *aux)
795 {
796 struct tegra_dpaux *dpaux = to_dpaux(aux);
797 u32 value;
798
799 value = tegra_dpaux_readl(dpaux, DPAUX_DP_AUXSTAT);
800
801 if (value & DPAUX_DP_AUXSTAT_HPD_STATUS)
802 return connector_status_connected;
803
804 return connector_status_disconnected;
805 }
806
drm_dp_aux_enable(struct drm_dp_aux * aux)807 int drm_dp_aux_enable(struct drm_dp_aux *aux)
808 {
809 struct tegra_dpaux *dpaux = to_dpaux(aux);
810
811 return tegra_dpaux_pad_config(dpaux, DPAUX_PADCTL_FUNC_AUX);
812 }
813
drm_dp_aux_disable(struct drm_dp_aux * aux)814 int drm_dp_aux_disable(struct drm_dp_aux *aux)
815 {
816 struct tegra_dpaux *dpaux = to_dpaux(aux);
817
818 tegra_dpaux_pad_power_down(dpaux);
819
820 return 0;
821 }
822