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 
54 struct 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 
71 static inline struct ps8622_bridge *
72 		bridge_to_ps8622(struct drm_bridge *bridge)
73 {
74 	return container_of(bridge, struct ps8622_bridge, bridge);
75 }
76 
77 static inline struct ps8622_bridge *
78 		connector_to_ps8622(struct drm_connector *connector)
79 {
80 	return container_of(connector, struct ps8622_bridge, connector);
81 }
82 
83 static 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 
102 static 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 
337 error:
338 	return err ? -EIO : 0;
339 }
340 
341 static 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 
358 static const struct backlight_ops ps8622_backlight_ops = {
359 	.update_status	= ps8622_backlight_update,
360 };
361 
362 static 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 
412 static 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 
422 static 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 
433 static 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 
468 static 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 
477 static const struct drm_connector_helper_funcs ps8622_connector_helper_funcs = {
478 	.get_modes = ps8622_get_modes,
479 };
480 
481 static enum drm_connector_status ps8622_detect(struct drm_connector *connector,
482 								bool force)
483 {
484 	return connector_status_connected;
485 }
486 
487 static void ps8622_connector_destroy(struct drm_connector *connector)
488 {
489 	drm_connector_cleanup(connector);
490 }
491 
492 static const struct drm_connector_funcs ps8622_connector_funcs = {
493 	.dpms = drm_atomic_helper_connector_dpms,
494 	.fill_modes = drm_helper_probe_single_connector_modes,
495 	.detect = ps8622_detect,
496 	.destroy = ps8622_connector_destroy,
497 	.reset = drm_atomic_helper_connector_reset,
498 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
499 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
500 };
501 
502 static int ps8622_attach(struct drm_bridge *bridge)
503 {
504 	struct ps8622_bridge *ps8622 = bridge_to_ps8622(bridge);
505 	int ret;
506 
507 	if (!bridge->encoder) {
508 		DRM_ERROR("Parent encoder object not found");
509 		return -ENODEV;
510 	}
511 
512 	ps8622->connector.polled = DRM_CONNECTOR_POLL_HPD;
513 	ret = drm_connector_init(bridge->dev, &ps8622->connector,
514 			&ps8622_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
515 	if (ret) {
516 		DRM_ERROR("Failed to initialize connector with drm\n");
517 		return ret;
518 	}
519 	drm_connector_helper_add(&ps8622->connector,
520 					&ps8622_connector_helper_funcs);
521 	drm_connector_register(&ps8622->connector);
522 	drm_mode_connector_attach_encoder(&ps8622->connector,
523 							bridge->encoder);
524 
525 	if (ps8622->panel)
526 		drm_panel_attach(ps8622->panel, &ps8622->connector);
527 
528 	drm_helper_hpd_irq_event(ps8622->connector.dev);
529 
530 	return ret;
531 }
532 
533 static const struct drm_bridge_funcs ps8622_bridge_funcs = {
534 	.pre_enable = ps8622_pre_enable,
535 	.enable = ps8622_enable,
536 	.disable = ps8622_disable,
537 	.post_disable = ps8622_post_disable,
538 	.attach = ps8622_attach,
539 };
540 
541 static const struct of_device_id ps8622_devices[] = {
542 	{.compatible = "parade,ps8622",},
543 	{.compatible = "parade,ps8625",},
544 	{}
545 };
546 MODULE_DEVICE_TABLE(of, ps8622_devices);
547 
548 static int ps8622_probe(struct i2c_client *client,
549 					const struct i2c_device_id *id)
550 {
551 	struct device *dev = &client->dev;
552 	struct device_node *endpoint, *panel_node;
553 	struct ps8622_bridge *ps8622;
554 	int ret;
555 
556 	ps8622 = devm_kzalloc(dev, sizeof(*ps8622), GFP_KERNEL);
557 	if (!ps8622)
558 		return -ENOMEM;
559 
560 	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
561 	if (endpoint) {
562 		panel_node = of_graph_get_remote_port_parent(endpoint);
563 		if (panel_node) {
564 			ps8622->panel = of_drm_find_panel(panel_node);
565 			of_node_put(panel_node);
566 			if (!ps8622->panel)
567 				return -EPROBE_DEFER;
568 		}
569 	}
570 
571 	ps8622->client = client;
572 
573 	ps8622->v12 = devm_regulator_get(dev, "vdd12");
574 	if (IS_ERR(ps8622->v12)) {
575 		dev_info(dev, "no 1.2v regulator found for PS8622\n");
576 		ps8622->v12 = NULL;
577 	}
578 
579 	ps8622->gpio_slp = devm_gpiod_get(dev, "sleep", GPIOD_OUT_HIGH);
580 	if (IS_ERR(ps8622->gpio_slp)) {
581 		ret = PTR_ERR(ps8622->gpio_slp);
582 		dev_err(dev, "cannot get gpio_slp %d\n", ret);
583 		return ret;
584 	}
585 
586 	/*
587 	 * Assert the reset pin high to avoid the bridge being
588 	 * initialized prematurely
589 	 */
590 	ps8622->gpio_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
591 	if (IS_ERR(ps8622->gpio_rst)) {
592 		ret = PTR_ERR(ps8622->gpio_rst);
593 		dev_err(dev, "cannot get gpio_rst %d\n", ret);
594 		return ret;
595 	}
596 
597 	ps8622->max_lane_count = id->driver_data;
598 
599 	if (of_property_read_u32(dev->of_node, "lane-count",
600 						&ps8622->lane_count)) {
601 		ps8622->lane_count = ps8622->max_lane_count;
602 	} else if (ps8622->lane_count > ps8622->max_lane_count) {
603 		dev_info(dev, "lane-count property is too high,"
604 						"using max_lane_count\n");
605 		ps8622->lane_count = ps8622->max_lane_count;
606 	}
607 
608 	if (!of_find_property(dev->of_node, "use-external-pwm", NULL)) {
609 		ps8622->bl = backlight_device_register("ps8622-backlight",
610 				dev, ps8622, &ps8622_backlight_ops,
611 				NULL);
612 		if (IS_ERR(ps8622->bl)) {
613 			DRM_ERROR("failed to register backlight\n");
614 			ret = PTR_ERR(ps8622->bl);
615 			ps8622->bl = NULL;
616 			return ret;
617 		}
618 		ps8622->bl->props.max_brightness = PS8622_MAX_BRIGHTNESS;
619 		ps8622->bl->props.brightness = PS8622_MAX_BRIGHTNESS;
620 	}
621 
622 	ps8622->bridge.funcs = &ps8622_bridge_funcs;
623 	ps8622->bridge.of_node = dev->of_node;
624 	ret = drm_bridge_add(&ps8622->bridge);
625 	if (ret) {
626 		DRM_ERROR("Failed to add bridge\n");
627 		return ret;
628 	}
629 
630 	i2c_set_clientdata(client, ps8622);
631 
632 	return 0;
633 }
634 
635 static int ps8622_remove(struct i2c_client *client)
636 {
637 	struct ps8622_bridge *ps8622 = i2c_get_clientdata(client);
638 
639 	backlight_device_unregister(ps8622->bl);
640 	drm_bridge_remove(&ps8622->bridge);
641 
642 	return 0;
643 }
644 
645 static const struct i2c_device_id ps8622_i2c_table[] = {
646 	/* Device type, max_lane_count */
647 	{"ps8622", 1},
648 	{"ps8625", 2},
649 	{},
650 };
651 MODULE_DEVICE_TABLE(i2c, ps8622_i2c_table);
652 
653 static struct i2c_driver ps8622_driver = {
654 	.id_table	= ps8622_i2c_table,
655 	.probe		= ps8622_probe,
656 	.remove		= ps8622_remove,
657 	.driver		= {
658 		.name	= "ps8622",
659 		.of_match_table = ps8622_devices,
660 	},
661 };
662 module_i2c_driver(ps8622_driver);
663 
664 MODULE_AUTHOR("Vincent Palatin <vpalatin@chromium.org>");
665 MODULE_DESCRIPTION("Parade ps8622/ps8625 eDP-LVDS converter driver");
666 MODULE_LICENSE("GPL v2");
667