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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Parade PS8622 eDP/LVDS bridge driver
4 *
5 * Copyright (C) 2014 Google, Inc.
6 */
7
8#include <linux/backlight.h>
9#include <linux/delay.h>
10#include <linux/err.h>
11#include <linux/gpio/consumer.h>
12#include <linux/i2c.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16#include <linux/pm.h>
17#include <linux/regulator/consumer.h>
18
19#include <drm/drm_atomic_helper.h>
20#include <drm/drm_crtc.h>
21#include <drm/drm_of.h>
22#include <drm/drm_panel.h>
23#include <drm/drm_print.h>
24#include <drm/drm_probe_helper.h>
25
26/* Brightness scale on the Parade chip */
27#define PS8622_MAX_BRIGHTNESS 0xff
28
29/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
30#define PS8622_POWER_RISE_T1_MIN_US 10
31#define PS8622_POWER_RISE_T1_MAX_US 10000
32#define PS8622_RST_HIGH_T2_MIN_US 3000
33#define PS8622_RST_HIGH_T2_MAX_US 30000
34#define PS8622_PWMO_END_T12_MS 200
35#define PS8622_POWER_FALL_T16_MAX_US 10000
36#define PS8622_POWER_OFF_T17_MS 500
37
38#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
39 (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
40#error "T2.min + T1.max must be less than T2.max + T1.min"
41#endif
42
43struct ps8622_bridge {
44 struct drm_connector connector;
45 struct i2c_client *client;
46 struct drm_bridge bridge;
47 struct drm_panel *panel;
48 struct regulator *v12;
49 struct backlight_device *bl;
50
51 struct gpio_desc *gpio_slp;
52 struct gpio_desc *gpio_rst;
53
54 u32 max_lane_count;
55 u32 lane_count;
56
57 bool enabled;
58};
59
60static inline struct ps8622_bridge *
61 bridge_to_ps8622(struct drm_bridge *bridge)
62{
63 return container_of(bridge, struct ps8622_bridge, bridge);
64}
65
66static inline struct ps8622_bridge *
67 connector_to_ps8622(struct drm_connector *connector)
68{
69 return container_of(connector, struct ps8622_bridge, connector);
70}
71
72static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
73{
74 int ret;
75 struct i2c_adapter *adap = client->adapter;
76 struct i2c_msg msg;
77 u8 data[] = {reg, val};
78
79 msg.addr = client->addr + page;
80 msg.flags = 0;
81 msg.len = sizeof(data);
82 msg.buf = data;
83
84 ret = i2c_transfer(adap, &msg, 1);
85 if (ret != 1)
86 pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
87 client->addr + page, reg, val, ret);
88 return !(ret == 1);
89}
90
91static int ps8622_send_config(struct ps8622_bridge *ps8622)
92{
93 struct i2c_client *cl = ps8622->client;
94 int err = 0;
95
96 /* HPD low */
97 err = ps8622_set(cl, 0x02, 0xa1, 0x01);
98 if (err)
99 goto error;
100
101 /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */
102 err = ps8622_set(cl, 0x04, 0x14, 0x01);
103 if (err)
104 goto error;
105
106 /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */
107 err = ps8622_set(cl, 0x04, 0xe3, 0x20);
108 if (err)
109 goto error;
110
111 /* [7] RCO SS enable */
112 err = ps8622_set(cl, 0x04, 0xe2, 0x80);
113 if (err)
114 goto error;
115
116 /* RPHY Setting
117 * [3:2] CDR tune wait cycle before measure for fine tune
118 * b00: 1us b01: 0.5us b10:2us, b11: 4us
119 */
120 err = ps8622_set(cl, 0x04, 0x8a, 0x0c);
121 if (err)
122 goto error;
123
124 /* [3] RFD always on */
125 err = ps8622_set(cl, 0x04, 0x89, 0x08);
126 if (err)
127 goto error;
128
129 /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */
130 err = ps8622_set(cl, 0x04, 0x71, 0x2d);
131 if (err)
132 goto error;
133
134 /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */
135 err = ps8622_set(cl, 0x04, 0x7d, 0x07);
136 if (err)
137 goto error;
138
139 /* [1:0] Fmin=+4bands */
140 err = ps8622_set(cl, 0x04, 0x7b, 0x00);
141 if (err)
142 goto error;
143
144 /* [7:5] DCO_FTRNG=+-40% */
145 err = ps8622_set(cl, 0x04, 0x7a, 0xfd);
146 if (err)
147 goto error;
148
149 /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */
150 err = ps8622_set(cl, 0x04, 0xc0, 0x12);
151 if (err)
152 goto error;
153
154 /* Gitune=-37% */
155 err = ps8622_set(cl, 0x04, 0xc1, 0x92);
156 if (err)
157 goto error;
158
159 /* Fbstep=100% */
160 err = ps8622_set(cl, 0x04, 0xc2, 0x1c);
161 if (err)
162 goto error;
163
164 /* [7] LOS signal disable */
165 err = ps8622_set(cl, 0x04, 0x32, 0x80);
166 if (err)
167 goto error;
168
169 /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */
170 err = ps8622_set(cl, 0x04, 0x00, 0xb0);
171 if (err)
172 goto error;
173
174 /* [7:6] Right-bar GPIO output strength is 8mA */
175 err = ps8622_set(cl, 0x04, 0x15, 0x40);
176 if (err)
177 goto error;
178
179 /* EQ Training State Machine Setting, RCO calibration start */
180 err = ps8622_set(cl, 0x04, 0x54, 0x10);
181 if (err)
182 goto error;
183
184 /* Logic, needs more than 10 I2C command */
185 /* [4:0] MAX_LANE_COUNT set to max supported lanes */
186 err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count);
187 if (err)
188 goto error;
189
190 /* [4:0] LANE_COUNT_SET set to chosen lane count */
191 err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count);
192 if (err)
193 goto error;
194
195 err = ps8622_set(cl, 0x00, 0x52, 0x20);
196 if (err)
197 goto error;
198
199 /* HPD CP toggle enable */
200 err = ps8622_set(cl, 0x00, 0xf1, 0x03);
201 if (err)
202 goto error;
203
204 err = ps8622_set(cl, 0x00, 0x62, 0x41);
205 if (err)
206 goto error;
207
208 /* Counter number, add 1ms counter delay */
209 err = ps8622_set(cl, 0x00, 0xf6, 0x01);
210 if (err)
211 goto error;
212
213 /* [6]PWM function control by DPCD0040f[7], default is PWM block */
214 err = ps8622_set(cl, 0x00, 0x77, 0x06);
215 if (err)
216 goto error;
217
218 /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */
219 err = ps8622_set(cl, 0x00, 0x4c, 0x04);
220 if (err)
221 goto error;
222
223 /* DPCD00400='h00, Parade OUI ='h001cf8 */
224 err = ps8622_set(cl, 0x01, 0xc0, 0x00);
225 if (err)
226 goto error;
227
228 /* DPCD00401='h1c */
229 err = ps8622_set(cl, 0x01, 0xc1, 0x1c);
230 if (err)
231 goto error;
232
233 /* DPCD00402='hf8 */
234 err = ps8622_set(cl, 0x01, 0xc2, 0xf8);
235 if (err)
236 goto error;
237
238 /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */
239 err = ps8622_set(cl, 0x01, 0xc3, 0x44);
240 if (err)
241 goto error;
242
243 /* DPCD404 */
244 err = ps8622_set(cl, 0x01, 0xc4, 0x32);
245 if (err)
246 goto error;
247
248 /* DPCD405 */
249 err = ps8622_set(cl, 0x01, 0xc5, 0x53);
250 if (err)
251 goto error;
252
253 /* DPCD406 */
254 err = ps8622_set(cl, 0x01, 0xc6, 0x4c);
255 if (err)
256 goto error;
257
258 /* DPCD407 */
259 err = ps8622_set(cl, 0x01, 0xc7, 0x56);
260 if (err)
261 goto error;
262
263 /* DPCD408 */
264 err = ps8622_set(cl, 0x01, 0xc8, 0x35);
265 if (err)
266 goto error;
267
268 /* DPCD40A, Initial Code major revision '01' */
269 err = ps8622_set(cl, 0x01, 0xca, 0x01);
270 if (err)
271 goto error;
272
273 /* DPCD40B, Initial Code minor revision '05' */
274 err = ps8622_set(cl, 0x01, 0xcb, 0x05);
275 if (err)
276 goto error;
277
278
279 if (ps8622->bl) {
280 /* DPCD720, internal PWM */
281 err = ps8622_set(cl, 0x01, 0xa5, 0xa0);
282 if (err)
283 goto error;
284
285 /* FFh for 100% brightness, 0h for 0% brightness */
286 err = ps8622_set(cl, 0x01, 0xa7,
287 ps8622->bl->props.brightness);
288 if (err)
289 goto error;
290 } else {
291 /* DPCD720, external PWM */
292 err = ps8622_set(cl, 0x01, 0xa5, 0x80);
293 if (err)
294 goto error;
295 }
296
297 /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */
298 err = ps8622_set(cl, 0x01, 0xcc, 0x13);
299 if (err)
300 goto error;
301
302 /* Enable SSC set by register */
303 err = ps8622_set(cl, 0x02, 0xb1, 0x20);
304 if (err)
305 goto error;
306
307 /* Set SSC enabled and +/-1% central spreading */
308 err = ps8622_set(cl, 0x04, 0x10, 0x16);
309 if (err)
310 goto error;
311
312 /* Logic end */
313 /* MPU Clock source: LC => RCO */
314 err = ps8622_set(cl, 0x04, 0x59, 0x60);
315 if (err)
316 goto error;
317
318 /* LC -> RCO */
319 err = ps8622_set(cl, 0x04, 0x54, 0x14);
320 if (err)
321 goto error;
322
323 /* HPD high */
324 err = ps8622_set(cl, 0x02, 0xa1, 0x91);
325
326error:
327 return err ? -EIO : 0;
328}
329
330static int ps8622_backlight_update(struct backlight_device *bl)
331{
332 struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
333 int ret, brightness = bl->props.brightness;
334
335 if (bl->props.power != FB_BLANK_UNBLANK ||
336 bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
337 brightness = 0;
338
339 if (!ps8622->enabled)
340 return -EINVAL;
341
342 ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
343
344 return ret;
345}
346
347static const struct backlight_ops ps8622_backlight_ops = {
348 .update_status = ps8622_backlight_update,
349};
350
351static void ps8622_pre_enable(struct drm_bridge *bridge)
352{
353 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
354 int ret;
355
356 if (ps8622->enabled)
357 return;
358
359 gpiod_set_value(ps8622->gpio_rst, 0);
360
361 if (ps8622->v12) {
362 ret = regulator_enable(ps8622->v12);
363 if (ret)
364 DRM_ERROR("fails to enable ps8622->v12");
365 }
366
367 if (drm_panel_prepare(ps8622->panel)) {
368 DRM_ERROR("failed to prepare panel\n");
369 return;
370 }
371
372 gpiod_set_value(ps8622->gpio_slp, 1);
373
374 /*
375 * T1 is the range of time that it takes for the power to rise after we
376 * enable the lcd/ps8622 fet. T2 is the range of time in which the
377 * data sheet specifies we should deassert the reset pin.
378 *
379 * If it takes T1.max for the power to rise, we need to wait atleast
380 * T2.min before deasserting the reset pin. If it takes T1.min for the
381 * power to rise, we need to wait at most T2.max before deasserting the
382 * reset pin.
383 */
384 usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
385 PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
386
387 gpiod_set_value(ps8622->gpio_rst, 1);
388
389 /* wait 20ms after RST high */
390 usleep_range(20000, 30000);
391
392 ret = ps8622_send_config(ps8622);
393 if (ret) {
394 DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
395 return;
396 }
397
398 ps8622->enabled = true;
399}
400
401static void ps8622_enable(struct drm_bridge *bridge)
402{
403 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
404
405 if (drm_panel_enable(ps8622->panel)) {
406 DRM_ERROR("failed to enable panel\n");
407 return;
408 }
409}
410
411static void ps8622_disable(struct drm_bridge *bridge)
412{
413 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
414
415 if (drm_panel_disable(ps8622->panel)) {
416 DRM_ERROR("failed to disable panel\n");
417 return;
418 }
419 msleep(PS8622_PWMO_END_T12_MS);
420}
421
422static void ps8622_post_disable(struct drm_bridge *bridge)
423{
424 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
425
426 if (!ps8622->enabled)
427 return;
428
429 ps8622->enabled = false;
430
431 /*
432 * This doesn't matter if the regulators are turned off, but something
433 * else might keep them on. In that case, we want to assert the slp gpio
434 * to lower power.
435 */
436 gpiod_set_value(ps8622->gpio_slp, 0);
437
438 if (drm_panel_unprepare(ps8622->panel)) {
439 DRM_ERROR("failed to unprepare panel\n");
440 return;
441 }
442
443 if (ps8622->v12)
444 regulator_disable(ps8622->v12);
445
446 /*
447 * Sleep for at least the amount of time that it takes the power rail to
448 * fall to prevent asserting the rst gpio from doing anything.
449 */
450 usleep_range(PS8622_POWER_FALL_T16_MAX_US,
451 2 * PS8622_POWER_FALL_T16_MAX_US);
452 gpiod_set_value(ps8622->gpio_rst, 0);
453
454 msleep(PS8622_POWER_OFF_T17_MS);
455}
456
457static int ps8622_get_modes(struct drm_connector *connector)
458{
459 struct ps8622_bridge *ps8622;
460
461 ps8622 = connector_to_ps8622(connector);
462
463 return drm_panel_get_modes(ps8622->panel);
464}
465
466static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
467 .get_modes = ps8622_get_modes,
468};
469
470static const struct drm_connector_funcs ps8622_connector_funcs = {
471 .fill_modes = drm_helper_probe_single_connector_modes,
472 .destroy = drm_connector_cleanup,
473 .reset = drm_atomic_helper_connector_reset,
474 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
475 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
476};
477
478static int ps8622_attach(struct drm_bridge *bridge)
479{
480 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
481 int ret;
482
483 if (!bridge->encoder) {
484 DRM_ERROR("Parent encoder object not found");
485 return -ENODEV;
486 }
487
488 ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD;
489 ret = drm_connector_init(bridge->dev, &ps8622->connector,
490 &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
491 if (ret) {
492 DRM_ERROR("Failed to initialize connector with drm\n");
493 return ret;
494 }
495 drm_connector_helper_add(&ps8622->connector,
496 &ps8622_connector_helper_funcs);
497 drm_connector_register(&ps8622->connector);
498 drm_connector_attach_encoder(&ps8622->connector,
499 bridge->encoder);
500
501 if (ps8622->panel)
502 drm_panel_attach(ps8622->panel, &ps8622->connector);
503
504 drm_helper_hpd_irq_event(ps8622->connector.dev);
505
506 return ret;
507}
508
509static const struct drm_bridge_funcs ps8622_bridge_funcs = {
510 .pre_enable = ps8622_pre_enable,
511 .enable = ps8622_enable,
512 .disable = ps8622_disable,
513 .post_disable = ps8622_post_disable,
514 .attach = ps8622_attach,
515};
516
517static const struct of_device_id ps8622_devices[] = {
518 {.compatible = "parade,ps8622",},
519 {.compatible = "parade,ps8625",},
520 {}
521};
522MODULE_DEVICE_TABLE(of, ps8622_devices);
523
524static int ps8622_probe(struct i2c_client *client,
525 const struct i2c_device_id *id)
526{
527 struct device *dev = &client->dev;
528 struct ps8622_bridge *ps8622;
529 int ret;
530
531 ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
532 if (!ps8622)
533 return -ENOMEM;
534
535 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &ps8622->panel, NULL);
536 if (ret)
537 return ret;
538
539 ps8622->client = client;
540
541 ps8622->v12 = devm_regulator_get(dev, "vdd12");
542 if (IS_ERR(ps8622->v12)) {
543 dev_info(dev, "no 1.2v regulator found for PS8622\n");
544 ps8622->v12 = NULL;
545 }
546
547 ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);
548 if (IS_ERR(ps8622->gpio_slp)) {
549 ret = PTR_ERR(ps8622->gpio_slp);
550 dev_err(dev, "cannot get gpio_slp %d\n", ret);
551 return ret;
552 }
553
554 /*
555 * Assert the reset pin high to avoid the bridge being
556 * initialized prematurely
557 */
558 ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
559 if (IS_ERR(ps8622->gpio_rst)) {
560 ret = PTR_ERR(ps8622->gpio_rst);
561 dev_err(dev, "cannot get gpio_rst %d\n", ret);
562 return ret;
563 }
564
565 ps8622->max_lane_count = id->driver_data;
566
567 if (of_property_read_u32(dev->of_node, "lane-count",
568 &ps8622->lane_count)) {
569 ps8622->lane_count = ps8622->max_lane_count;
570 } else if (ps8622->lane_count > ps8622->max_lane_count) {
571 dev_info(dev, "lane-count property is too high,"
572 "using max_lane_count\n");
573 ps8622->lane_count = ps8622->max_lane_count;
574 }
575
576 if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
577 ps8622->bl = backlight_device_register("ps8622-backlight",
578 dev, ps8622, &ps8622_backlight_ops,
579 NULL);
580 if (IS_ERR(ps8622->bl)) {
581 DRM_ERROR("failed to register backlight\n");
582 ret = PTR_ERR(ps8622->bl);
583 ps8622->bl = NULL;
584 return ret;
585 }
586 ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
587 ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
588 }
589
590 ps8622->bridge.funcs = &ps8622_bridge_funcs;
591 ps8622->bridge.of_node = dev->of_node;
592 drm_bridge_add(&ps8622->bridge);
593
594 i2c_set_clientdata(client, ps8622);
595
596 return 0;
597}
598
599static int ps8622_remove(struct i2c_client *client)
600{
601 struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
602
603 backlight_device_unregister(ps8622->bl);
604 drm_bridge_remove(&ps8622->bridge);
605
606 return 0;
607}
608
609static const struct i2c_device_id ps8622_i2c_table[] = {
610 /* Device type, max_lane_count */
611 {"ps8622", 1},
612 {"ps8625", 2},
613 {},
614};
615MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table);
616
617static struct i2c_driver ps8622_driver = {
618 .id_table = ps8622_i2c_table,
619 .probe = ps8622_probe,
620 .remove = ps8622_remove,
621 .driver = {
622 .name = "ps8622",
623 .of_match_table = ps8622_devices,
624 },
625};
626module_i2c_driver(ps8622_driver);
627
628MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>");
629MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");
630MODULE_LICENSE("GPL v2");