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1/*
2 * Parade PS8622 eDP/LVDS bridge driver
3 *
4 * Copyright (C) 2014 Google, Inc.
5 *
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/backlight.h>
17#include <linux/delay.h>
18#include <linux/err.h>
19#include <linux/fb.h>
20#include <linux/gpio.h>
21#include <linux/gpio/consumer.h>
22#include <linux/i2c.h>
23#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/of_device.h>
26#include <linux/of_graph.h>
27#include <linux/pm.h>
28#include <linux/regulator/consumer.h>
29
30#include <drm/drm_panel.h>
31
32#include "drmP.h"
33#include "drm_crtc.h"
34#include "drm_crtc_helper.h"
35#include "drm_atomic_helper.h"
36
37/* Brightness scale on the Parade chip */
38#define PS8622_MAX_BRIGHTNESS 0xff
39
40/* Timings taken from the version 1.7 datasheet for the PS8622/PS8625 */
41#define PS8622_POWER_RISE_T1_MIN_US 10
42#define PS8622_POWER_RISE_T1_MAX_US 10000
43#define PS8622_RST_HIGH_T2_MIN_US 3000
44#define PS8622_RST_HIGH_T2_MAX_US 30000
45#define PS8622_PWMO_END_T12_MS 200
46#define PS8622_POWER_FALL_T16_MAX_US 10000
47#define PS8622_POWER_OFF_T17_MS 500
48
49#if ((PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US) > \
50 (PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US))
51#error "T2.min + T1.max must be less than T2.max + T1.min"
52#endif
53
54struct ps8622_bridge {
55 struct drm_connector connector;
56 struct i2c_client *client;
57 struct drm_bridge bridge;
58 struct drm_panel *panel;
59 struct regulator *v12;
60 struct backlight_device *bl;
61
62 struct gpio_desc *gpio_slp;
63 struct gpio_desc *gpio_rst;
64
65 u32 max_lane_count;
66 u32 lane_count;
67
68 bool enabled;
69};
70
71static inline struct ps8622_bridge *
72 bridge_to_ps8622(struct drm_bridge *bridge)
73{
74 return container_of(bridge, struct ps8622_bridge, bridge);
75}
76
77static inline struct ps8622_bridge *
78 connector_to_ps8622(struct drm_connector *connector)
79{
80 return container_of(connector, struct ps8622_bridge, connector);
81}
82
83static int ps8622_set(struct i2c_client *client, u8 page, u8 reg, u8 val)
84{
85 int ret;
86 struct i2c_adapter *adap = client->adapter;
87 struct i2c_msg msg;
88 u8 data[] = {reg, val};
89
90 msg.addr = client->addr + page;
91 msg.flags = 0;
92 msg.len = sizeof(data);
93 msg.buf = data;
94
95 ret = i2c_transfer(adap, &msg, 1);
96 if (ret != 1)
97 pr_warn("PS8622 I2C write (0x%02x,0x%02x,0x%02x) failed: %d\n",
98 client->addr + page, reg, val, ret);
99 return !(ret == 1);
100}
101
102static int ps8622_send_config(struct ps8622_bridge *ps8622)
103{
104 struct i2c_client *cl = ps8622->client;
105 int err = 0;
106
107 /* HPD low */
108 err = ps8622_set(cl, 0x02, 0xa1, 0x01);
109 if (err)
110 goto error;
111
112 /* SW setting: [1:0] SW output 1.2V voltage is lower to 96% */
113 err = ps8622_set(cl, 0x04, 0x14, 0x01);
114 if (err)
115 goto error;
116
117 /* RCO SS setting: [5:4] = b01 0.5%, b10 1%, b11 1.5% */
118 err = ps8622_set(cl, 0x04, 0xe3, 0x20);
119 if (err)
120 goto error;
121
122 /* [7] RCO SS enable */
123 err = ps8622_set(cl, 0x04, 0xe2, 0x80);
124 if (err)
125 goto error;
126
127 /* RPHY Setting
128 * [3:2] CDR tune wait cycle before measure for fine tune
129 * b00: 1us b01: 0.5us b10:2us, b11: 4us
130 */
131 err = ps8622_set(cl, 0x04, 0x8a, 0x0c);
132 if (err)
133 goto error;
134
135 /* [3] RFD always on */
136 err = ps8622_set(cl, 0x04, 0x89, 0x08);
137 if (err)
138 goto error;
139
140 /* CTN lock in/out: 20000ppm/80000ppm. Lock out 2 times. */
141 err = ps8622_set(cl, 0x04, 0x71, 0x2d);
142 if (err)
143 goto error;
144
145 /* 2.7G CDR settings: NOF=40LSB for HBR CDR setting */
146 err = ps8622_set(cl, 0x04, 0x7d, 0x07);
147 if (err)
148 goto error;
149
150 /* [1:0] Fmin=+4bands */
151 err = ps8622_set(cl, 0x04, 0x7b, 0x00);
152 if (err)
153 goto error;
154
155 /* [7:5] DCO_FTRNG=+-40% */
156 err = ps8622_set(cl, 0x04, 0x7a, 0xfd);
157 if (err)
158 goto error;
159
160 /* 1.62G CDR settings: [5:2]NOF=64LSB [1:0]DCO scale is 2/5 */
161 err = ps8622_set(cl, 0x04, 0xc0, 0x12);
162 if (err)
163 goto error;
164
165 /* Gitune=-37% */
166 err = ps8622_set(cl, 0x04, 0xc1, 0x92);
167 if (err)
168 goto error;
169
170 /* Fbstep=100% */
171 err = ps8622_set(cl, 0x04, 0xc2, 0x1c);
172 if (err)
173 goto error;
174
175 /* [7] LOS signal disable */
176 err = ps8622_set(cl, 0x04, 0x32, 0x80);
177 if (err)
178 goto error;
179
180 /* RPIO Setting: [7:4] LVDS driver bias current : 75% (250mV swing) */
181 err = ps8622_set(cl, 0x04, 0x00, 0xb0);
182 if (err)
183 goto error;
184
185 /* [7:6] Right-bar GPIO output strength is 8mA */
186 err = ps8622_set(cl, 0x04, 0x15, 0x40);
187 if (err)
188 goto error;
189
190 /* EQ Training State Machine Setting, RCO calibration start */
191 err = ps8622_set(cl, 0x04, 0x54, 0x10);
192 if (err)
193 goto error;
194
195 /* Logic, needs more than 10 I2C command */
196 /* [4:0] MAX_LANE_COUNT set to max supported lanes */
197 err = ps8622_set(cl, 0x01, 0x02, 0x80 | ps8622->max_lane_count);
198 if (err)
199 goto error;
200
201 /* [4:0] LANE_COUNT_SET set to chosen lane count */
202 err = ps8622_set(cl, 0x01, 0x21, 0x80 | ps8622->lane_count);
203 if (err)
204 goto error;
205
206 err = ps8622_set(cl, 0x00, 0x52, 0x20);
207 if (err)
208 goto error;
209
210 /* HPD CP toggle enable */
211 err = ps8622_set(cl, 0x00, 0xf1, 0x03);
212 if (err)
213 goto error;
214
215 err = ps8622_set(cl, 0x00, 0x62, 0x41);
216 if (err)
217 goto error;
218
219 /* Counter number, add 1ms counter delay */
220 err = ps8622_set(cl, 0x00, 0xf6, 0x01);
221 if (err)
222 goto error;
223
224 /* [6]PWM function control by DPCD0040f[7], default is PWM block */
225 err = ps8622_set(cl, 0x00, 0x77, 0x06);
226 if (err)
227 goto error;
228
229 /* 04h Adjust VTotal toleranceto fix the 30Hz no display issue */
230 err = ps8622_set(cl, 0x00, 0x4c, 0x04);
231 if (err)
232 goto error;
233
234 /* DPCD00400='h00, Parade OUI ='h001cf8 */
235 err = ps8622_set(cl, 0x01, 0xc0, 0x00);
236 if (err)
237 goto error;
238
239 /* DPCD00401='h1c */
240 err = ps8622_set(cl, 0x01, 0xc1, 0x1c);
241 if (err)
242 goto error;
243
244 /* DPCD00402='hf8 */
245 err = ps8622_set(cl, 0x01, 0xc2, 0xf8);
246 if (err)
247 goto error;
248
249 /* DPCD403~408 = ASCII code, D2SLV5='h4432534c5635 */
250 err = ps8622_set(cl, 0x01, 0xc3, 0x44);
251 if (err)
252 goto error;
253
254 /* DPCD404 */
255 err = ps8622_set(cl, 0x01, 0xc4, 0x32);
256 if (err)
257 goto error;
258
259 /* DPCD405 */
260 err = ps8622_set(cl, 0x01, 0xc5, 0x53);
261 if (err)
262 goto error;
263
264 /* DPCD406 */
265 err = ps8622_set(cl, 0x01, 0xc6, 0x4c);
266 if (err)
267 goto error;
268
269 /* DPCD407 */
270 err = ps8622_set(cl, 0x01, 0xc7, 0x56);
271 if (err)
272 goto error;
273
274 /* DPCD408 */
275 err = ps8622_set(cl, 0x01, 0xc8, 0x35);
276 if (err)
277 goto error;
278
279 /* DPCD40A, Initial Code major revision '01' */
280 err = ps8622_set(cl, 0x01, 0xca, 0x01);
281 if (err)
282 goto error;
283
284 /* DPCD40B, Initial Code minor revision '05' */
285 err = ps8622_set(cl, 0x01, 0xcb, 0x05);
286 if (err)
287 goto error;
288
289
290 if (ps8622->bl) {
291 /* DPCD720, internal PWM */
292 err = ps8622_set(cl, 0x01, 0xa5, 0xa0);
293 if (err)
294 goto error;
295
296 /* FFh for 100% brightness, 0h for 0% brightness */
297 err = ps8622_set(cl, 0x01, 0xa7,
298 ps8622->bl->props.brightness);
299 if (err)
300 goto error;
301 } else {
302 /* DPCD720, external PWM */
303 err = ps8622_set(cl, 0x01, 0xa5, 0x80);
304 if (err)
305 goto error;
306 }
307
308 /* Set LVDS output as 6bit-VESA mapping, single LVDS channel */
309 err = ps8622_set(cl, 0x01, 0xcc, 0x13);
310 if (err)
311 goto error;
312
313 /* Enable SSC set by register */
314 err = ps8622_set(cl, 0x02, 0xb1, 0x20);
315 if (err)
316 goto error;
317
318 /* Set SSC enabled and +/-1% central spreading */
319 err = ps8622_set(cl, 0x04, 0x10, 0x16);
320 if (err)
321 goto error;
322
323 /* Logic end */
324 /* MPU Clock source: LC => RCO */
325 err = ps8622_set(cl, 0x04, 0x59, 0x60);
326 if (err)
327 goto error;
328
329 /* LC -> RCO */
330 err = ps8622_set(cl, 0x04, 0x54, 0x14);
331 if (err)
332 goto error;
333
334 /* HPD high */
335 err = ps8622_set(cl, 0x02, 0xa1, 0x91);
336
337error:
338 return err ? -EIO : 0;
339}
340
341static int ps8622_backlight_update(struct backlight_device *bl)
342{
343 struct ps8622_bridge *ps8622 = dev_get_drvdata(&bl->dev);
344 int ret, brightness = bl->props.brightness;
345
346 if (bl->props.power != FB_BLANK_UNBLANK ||
347 bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
348 brightness = 0;
349
350 if (!ps8622->enabled)
351 return -EINVAL;
352
353 ret = ps8622_set(ps8622->client, 0x01, 0xa7, brightness);
354
355 return ret;
356}
357
358static const struct backlight_ops ps8622_backlight_ops = {
359 .update_status = ps8622_backlight_update,
360};
361
362static void ps8622_pre_enable(struct drm_bridge *bridge)
363{
364 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
365 int ret;
366
367 if (ps8622->enabled)
368 return;
369
370 gpiod_set_value(ps8622->gpio_rst, 0);
371
372 if (ps8622->v12) {
373 ret = regulator_enable(ps8622->v12);
374 if (ret)
375 DRM_ERROR("fails to enable ps8622->v12");
376 }
377
378 if (drm_panel_prepare(ps8622->panel)) {
379 DRM_ERROR("failed to prepare panel\n");
380 return;
381 }
382
383 gpiod_set_value(ps8622->gpio_slp, 1);
384
385 /*
386 * T1 is the range of time that it takes for the power to rise after we
387 * enable the lcd/ps8622 fet. T2 is the range of time in which the
388 * data sheet specifies we should deassert the reset pin.
389 *
390 * If it takes T1.max for the power to rise, we need to wait atleast
391 * T2.min before deasserting the reset pin. If it takes T1.min for the
392 * power to rise, we need to wait at most T2.max before deasserting the
393 * reset pin.
394 */
395 usleep_range(PS8622_RST_HIGH_T2_MIN_US + PS8622_POWER_RISE_T1_MAX_US,
396 PS8622_RST_HIGH_T2_MAX_US + PS8622_POWER_RISE_T1_MIN_US);
397
398 gpiod_set_value(ps8622->gpio_rst, 1);
399
400 /* wait 20ms after RST high */
401 usleep_range(20000, 30000);
402
403 ret = ps8622_send_config(ps8622);
404 if (ret) {
405 DRM_ERROR("Failed to send config to bridge (%d)\n", ret);
406 return;
407 }
408
409 ps8622->enabled = true;
410}
411
412static void ps8622_enable(struct drm_bridge *bridge)
413{
414 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
415
416 if (drm_panel_enable(ps8622->panel)) {
417 DRM_ERROR("failed to enable panel\n");
418 return;
419 }
420}
421
422static void ps8622_disable(struct drm_bridge *bridge)
423{
424 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
425
426 if (drm_panel_disable(ps8622->panel)) {
427 DRM_ERROR("failed to disable panel\n");
428 return;
429 }
430 msleep(PS8622_PWMO_END_T12_MS);
431}
432
433static void ps8622_post_disable(struct drm_bridge *bridge)
434{
435 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
436
437 if (!ps8622->enabled)
438 return;
439
440 ps8622->enabled = false;
441
442 /*
443 * This doesn't matter if the regulators are turned off, but something
444 * else might keep them on. In that case, we want to assert the slp gpio
445 * to lower power.
446 */
447 gpiod_set_value(ps8622->gpio_slp, 0);
448
449 if (drm_panel_unprepare(ps8622->panel)) {
450 DRM_ERROR("failed to unprepare panel\n");
451 return;
452 }
453
454 if (ps8622->v12)
455 regulator_disable(ps8622->v12);
456
457 /*
458 * Sleep for at least the amount of time that it takes the power rail to
459 * fall to prevent asserting the rst gpio from doing anything.
460 */
461 usleep_range(PS8622_POWER_FALL_T16_MAX_US,
462 2 * PS8622_POWER_FALL_T16_MAX_US);
463 gpiod_set_value(ps8622->gpio_rst, 0);
464
465 msleep(PS8622_POWER_OFF_T17_MS);
466}
467
468static int ps8622_get_modes(struct drm_connector *connector)
469{
470 struct ps8622_bridge *ps8622;
471
472 ps8622 = connector_to_ps8622(connector);
473
474 return drm_panel_get_modes(ps8622->panel);
475}
476
477static struct drm_encoder *ps8622_best_encoder(struct drm_connector *connector)
478{
479 struct ps8622_bridge *ps8622;
480
481 ps8622 = connector_to_ps8622(connector);
482
483 return ps8622->bridge.encoder;
484}
485
486static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
487 .get_modes = ps8622_get_modes,
488 .best_encoder = ps8622_best_encoder,
489};
490
491static enum drm_connector_status ps8622_detect(struct drm_connector *connector,
492 bool force)
493{
494 return connector_status_connected;
495}
496
497static void ps8622_connector_destroy(struct drm_connector *connector)
498{
499 drm_connector_cleanup(connector);
500}
501
502static const struct drm_connector_funcs ps8622_connector_funcs = {
503 .dpms = drm_atomic_helper_connector_dpms,
504 .fill_modes = drm_helper_probe_single_connector_modes,
505 .detect = ps8622_detect,
506 .destroy = ps8622_connector_destroy,
507 .reset = drm_atomic_helper_connector_reset,
508 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
509 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
510};
511
512static int ps8622_attach(struct drm_bridge *bridge)
513{
514 struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
515 int ret;
516
517 if (!bridge->encoder) {
518 DRM_ERROR("Parent encoder object not found");
519 return -ENODEV;
520 }
521
522 ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD;
523 ret = drm_connector_init(bridge->dev, &ps8622->connector,
524 &ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
525 if (ret) {
526 DRM_ERROR("Failed to initialize connector with drm\n");
527 return ret;
528 }
529 drm_connector_helper_add(&ps8622->connector,
530 &ps8622_connector_helper_funcs);
531 drm_connector_register(&ps8622->connector);
532 drm_mode_connector_attach_encoder(&ps8622->connector,
533 bridge->encoder);
534
535 if (ps8622->panel)
536 drm_panel_attach(ps8622->panel, &ps8622->connector);
537
538 drm_helper_hpd_irq_event(ps8622->connector.dev);
539
540 return ret;
541}
542
543static const struct drm_bridge_funcs ps8622_bridge_funcs = {
544 .pre_enable = ps8622_pre_enable,
545 .enable = ps8622_enable,
546 .disable = ps8622_disable,
547 .post_disable = ps8622_post_disable,
548 .attach = ps8622_attach,
549};
550
551static const struct of_device_id ps8622_devices[] = {
552 {.compatible = "parade,ps8622",},
553 {.compatible = "parade,ps8625",},
554 {}
555};
556MODULE_DEVICE_TABLE(of, ps8622_devices);
557
558static int ps8622_probe(struct i2c_client *client,
559 const struct i2c_device_id *id)
560{
561 struct device *dev = &client->dev;
562 struct device_node *endpoint, *panel_node;
563 struct ps8622_bridge *ps8622;
564 int ret;
565
566 ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
567 if (!ps8622)
568 return -ENOMEM;
569
570 endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
571 if (endpoint) {
572 panel_node = of_graph_get_remote_port_parent(endpoint);
573 if (panel_node) {
574 ps8622->panel = of_drm_find_panel(panel_node);
575 of_node_put(panel_node);
576 if (!ps8622->panel)
577 return -EPROBE_DEFER;
578 }
579 }
580
581 ps8622->client = client;
582
583 ps8622->v12 = devm_regulator_get(dev, "vdd12");
584 if (IS_ERR(ps8622->v12)) {
585 dev_info(dev, "no 1.2v regulator found for PS8622\n");
586 ps8622->v12 = NULL;
587 }
588
589 ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);
590 if (IS_ERR(ps8622->gpio_slp)) {
591 ret = PTR_ERR(ps8622->gpio_slp);
592 dev_err(dev, "cannot get gpio_slp %d\n", ret);
593 return ret;
594 }
595
596 /*
597 * Assert the reset pin high to avoid the bridge being
598 * initialized prematurely
599 */
600 ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
601 if (IS_ERR(ps8622->gpio_rst)) {
602 ret = PTR_ERR(ps8622->gpio_rst);
603 dev_err(dev, "cannot get gpio_rst %d\n", ret);
604 return ret;
605 }
606
607 ps8622->max_lane_count = id->driver_data;
608
609 if (of_property_read_u32(dev->of_node, "lane-count",
610 &ps8622->lane_count)) {
611 ps8622->lane_count = ps8622->max_lane_count;
612 } else if (ps8622->lane_count > ps8622->max_lane_count) {
613 dev_info(dev, "lane-count property is too high,"
614 "using max_lane_count\n");
615 ps8622->lane_count = ps8622->max_lane_count;
616 }
617
618 if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
619 ps8622->bl = backlight_device_register("ps8622-backlight",
620 dev, ps8622, &ps8622_backlight_ops,
621 NULL);
622 if (IS_ERR(ps8622->bl)) {
623 DRM_ERROR("failed to register backlight\n");
624 ret = PTR_ERR(ps8622->bl);
625 ps8622->bl = NULL;
626 return ret;
627 }
628 ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
629 ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
630 }
631
632 ps8622->bridge.funcs = &ps8622_bridge_funcs;
633 ps8622->bridge.of_node = dev->of_node;
634 ret = drm_bridge_add(&ps8622->bridge);
635 if (ret) {
636 DRM_ERROR("Failed to add bridge\n");
637 return ret;
638 }
639
640 i2c_set_clientdata(client, ps8622);
641
642 return 0;
643}
644
645static int ps8622_remove(struct i2c_client *client)
646{
647 struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
648
649 if (ps8622->bl)
650 backlight_device_unregister(ps8622->bl);
651
652 drm_bridge_remove(&ps8622->bridge);
653
654 return 0;
655}
656
657static const struct i2c_device_id ps8622_i2c_table[] = {
658 /* Device type, max_lane_count */
659 {"ps8622", 1},
660 {"ps8625", 2},
661 {},
662};
663MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table);
664
665static struct i2c_driver ps8622_driver = {
666 .id_table = ps8622_i2c_table,
667 .probe = ps8622_probe,
668 .remove = ps8622_remove,
669 .driver = {
670 .name = "ps8622",
671 .of_match_table = ps8622_devices,
672 },
673};
674module_i2c_driver(ps8622_driver);
675
676MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>");
677MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");
678MODULE_LICENSE("GPL v2");