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Diffstat (limited to 'drivers/video/fbdev/omap/lcd_mipid.c')
-rw-r--r--drivers/video/fbdev/omap/lcd_mipid.c615
1 files changed, 615 insertions, 0 deletions
diff --git a/drivers/video/fbdev/omap/lcd_mipid.c b/drivers/video/fbdev/omap/lcd_mipid.c
new file mode 100644
index 000000000000..803fee618d57
--- /dev/null
+++ b/drivers/video/fbdev/omap/lcd_mipid.c
@@ -0,0 +1,615 @@
1/*
2 * LCD driver for MIPI DBI-C / DCS compatible LCDs
3 *
4 * Copyright (C) 2006 Nokia Corporation
5 * Author: Imre Deak <imre.deak@nokia.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21#include <linux/device.h>
22#include <linux/delay.h>
23#include <linux/slab.h>
24#include <linux/workqueue.h>
25#include <linux/spi/spi.h>
26#include <linux/module.h>
27
28#include <linux/platform_data/lcd-mipid.h>
29
30#include "omapfb.h"
31
32#define MIPID_MODULE_NAME "lcd_mipid"
33
34#define MIPID_CMD_READ_DISP_ID 0x04
35#define MIPID_CMD_READ_RED 0x06
36#define MIPID_CMD_READ_GREEN 0x07
37#define MIPID_CMD_READ_BLUE 0x08
38#define MIPID_CMD_READ_DISP_STATUS 0x09
39#define MIPID_CMD_RDDSDR 0x0F
40#define MIPID_CMD_SLEEP_IN 0x10
41#define MIPID_CMD_SLEEP_OUT 0x11
42#define MIPID_CMD_DISP_OFF 0x28
43#define MIPID_CMD_DISP_ON 0x29
44
45#define MIPID_ESD_CHECK_PERIOD msecs_to_jiffies(5000)
46
47#define to_mipid_device(p) container_of(p, struct mipid_device, \
48 panel)
49struct mipid_device {
50 int enabled;
51 int revision;
52 unsigned int saved_bklight_level;
53 unsigned long hw_guard_end; /* next value of jiffies
54 when we can issue the
55 next sleep in/out command */
56 unsigned long hw_guard_wait; /* max guard time in jiffies */
57
58 struct omapfb_device *fbdev;
59 struct spi_device *spi;
60 struct mutex mutex;
61 struct lcd_panel panel;
62
63 struct workqueue_struct *esd_wq;
64 struct delayed_work esd_work;
65 void (*esd_check)(struct mipid_device *m);
66};
67
68static void mipid_transfer(struct mipid_device *md, int cmd, const u8 *wbuf,
69 int wlen, u8 *rbuf, int rlen)
70{
71 struct spi_message m;
72 struct spi_transfer *x, xfer[4];
73 u16 w;
74 int r;
75
76 BUG_ON(md->spi == NULL);
77
78 spi_message_init(&m);
79
80 memset(xfer, 0, sizeof(xfer));
81 x = &xfer[0];
82
83 cmd &= 0xff;
84 x->tx_buf = &cmd;
85 x->bits_per_word = 9;
86 x->len = 2;
87 spi_message_add_tail(x, &m);
88
89 if (wlen) {
90 x++;
91 x->tx_buf = wbuf;
92 x->len = wlen;
93 x->bits_per_word = 9;
94 spi_message_add_tail(x, &m);
95 }
96
97 if (rlen) {
98 x++;
99 x->rx_buf = &w;
100 x->len = 1;
101 spi_message_add_tail(x, &m);
102
103 if (rlen > 1) {
104 /* Arrange for the extra clock before the first
105 * data bit.
106 */
107 x->bits_per_word = 9;
108 x->len = 2;
109
110 x++;
111 x->rx_buf = &rbuf[1];
112 x->len = rlen - 1;
113 spi_message_add_tail(x, &m);
114 }
115 }
116
117 r = spi_sync(md->spi, &m);
118 if (r < 0)
119 dev_dbg(&md->spi->dev, "spi_sync %d\n", r);
120
121 if (rlen)
122 rbuf[0] = w & 0xff;
123}
124
125static inline void mipid_cmd(struct mipid_device *md, int cmd)
126{
127 mipid_transfer(md, cmd, NULL, 0, NULL, 0);
128}
129
130static inline void mipid_write(struct mipid_device *md,
131 int reg, const u8 *buf, int len)
132{
133 mipid_transfer(md, reg, buf, len, NULL, 0);
134}
135
136static inline void mipid_read(struct mipid_device *md,
137 int reg, u8 *buf, int len)
138{
139 mipid_transfer(md, reg, NULL, 0, buf, len);
140}
141
142static void set_data_lines(struct mipid_device *md, int data_lines)
143{
144 u16 par;
145
146 switch (data_lines) {
147 case 16:
148 par = 0x150;
149 break;
150 case 18:
151 par = 0x160;
152 break;
153 case 24:
154 par = 0x170;
155 break;
156 }
157 mipid_write(md, 0x3a, (u8 *)&par, 2);
158}
159
160static void send_init_string(struct mipid_device *md)
161{
162 u16 initpar[] = { 0x0102, 0x0100, 0x0100 };
163
164 mipid_write(md, 0xc2, (u8 *)initpar, sizeof(initpar));
165 set_data_lines(md, md->panel.data_lines);
166}
167
168static void hw_guard_start(struct mipid_device *md, int guard_msec)
169{
170 md->hw_guard_wait = msecs_to_jiffies(guard_msec);
171 md->hw_guard_end = jiffies + md->hw_guard_wait;
172}
173
174static void hw_guard_wait(struct mipid_device *md)
175{
176 unsigned long wait = md->hw_guard_end - jiffies;
177
178 if ((long)wait > 0 && wait <= md->hw_guard_wait) {
179 set_current_state(TASK_UNINTERRUPTIBLE);
180 schedule_timeout(wait);
181 }
182}
183
184static void set_sleep_mode(struct mipid_device *md, int on)
185{
186 int cmd, sleep_time = 50;
187
188 if (on)
189 cmd = MIPID_CMD_SLEEP_IN;
190 else
191 cmd = MIPID_CMD_SLEEP_OUT;
192 hw_guard_wait(md);
193 mipid_cmd(md, cmd);
194 hw_guard_start(md, 120);
195 /*
196 * When we enable the panel, it seems we _have_ to sleep
197 * 120 ms before sending the init string. When disabling the
198 * panel we'll sleep for the duration of 2 frames, so that the
199 * controller can still provide the PCLK,HS,VS signals.
200 */
201 if (!on)
202 sleep_time = 120;
203 msleep(sleep_time);
204}
205
206static void set_display_state(struct mipid_device *md, int enabled)
207{
208 int cmd = enabled ? MIPID_CMD_DISP_ON : MIPID_CMD_DISP_OFF;
209
210 mipid_cmd(md, cmd);
211}
212
213static int mipid_set_bklight_level(struct lcd_panel *panel, unsigned int level)
214{
215 struct mipid_device *md = to_mipid_device(panel);
216 struct mipid_platform_data *pd = md->spi->dev.platform_data;
217
218 if (pd->get_bklight_max == NULL || pd->set_bklight_level == NULL)
219 return -ENODEV;
220 if (level > pd->get_bklight_max(pd))
221 return -EINVAL;
222 if (!md->enabled) {
223 md->saved_bklight_level = level;
224 return 0;
225 }
226 pd->set_bklight_level(pd, level);
227
228 return 0;
229}
230
231static unsigned int mipid_get_bklight_level(struct lcd_panel *panel)
232{
233 struct mipid_device *md = to_mipid_device(panel);
234 struct mipid_platform_data *pd = md->spi->dev.platform_data;
235
236 if (pd->get_bklight_level == NULL)
237 return -ENODEV;
238 return pd->get_bklight_level(pd);
239}
240
241static unsigned int mipid_get_bklight_max(struct lcd_panel *panel)
242{
243 struct mipid_device *md = to_mipid_device(panel);
244 struct mipid_platform_data *pd = md->spi->dev.platform_data;
245
246 if (pd->get_bklight_max == NULL)
247 return -ENODEV;
248
249 return pd->get_bklight_max(pd);
250}
251
252static unsigned long mipid_get_caps(struct lcd_panel *panel)
253{
254 return OMAPFB_CAPS_SET_BACKLIGHT;
255}
256
257static u16 read_first_pixel(struct mipid_device *md)
258{
259 u16 pixel;
260 u8 red, green, blue;
261
262 mutex_lock(&md->mutex);
263 mipid_read(md, MIPID_CMD_READ_RED, &red, 1);
264 mipid_read(md, MIPID_CMD_READ_GREEN, &green, 1);
265 mipid_read(md, MIPID_CMD_READ_BLUE, &blue, 1);
266 mutex_unlock(&md->mutex);
267
268 switch (md->panel.data_lines) {
269 case 16:
270 pixel = ((red >> 1) << 11) | (green << 5) | (blue >> 1);
271 break;
272 case 24:
273 /* 24 bit -> 16 bit */
274 pixel = ((red >> 3) << 11) | ((green >> 2) << 5) |
275 (blue >> 3);
276 break;
277 default:
278 pixel = 0;
279 BUG();
280 }
281
282 return pixel;
283}
284
285static int mipid_run_test(struct lcd_panel *panel, int test_num)
286{
287 struct mipid_device *md = to_mipid_device(panel);
288 static const u16 test_values[4] = {
289 0x0000, 0xffff, 0xaaaa, 0x5555,
290 };
291 int i;
292
293 if (test_num != MIPID_TEST_RGB_LINES)
294 return MIPID_TEST_INVALID;
295
296 for (i = 0; i < ARRAY_SIZE(test_values); i++) {
297 int delay;
298 unsigned long tmo;
299
300 omapfb_write_first_pixel(md->fbdev, test_values[i]);
301 tmo = jiffies + msecs_to_jiffies(100);
302 delay = 25;
303 while (1) {
304 u16 pixel;
305
306 msleep(delay);
307 pixel = read_first_pixel(md);
308 if (pixel == test_values[i])
309 break;
310 if (time_after(jiffies, tmo)) {
311 dev_err(&md->spi->dev,
312 "MIPI LCD RGB I/F test failed: "
313 "expecting %04x, got %04x\n",
314 test_values[i], pixel);
315 return MIPID_TEST_FAILED;
316 }
317 delay = 10;
318 }
319 }
320
321 return 0;
322}
323
324static void ls041y3_esd_recover(struct mipid_device *md)
325{
326 dev_err(&md->spi->dev, "performing LCD ESD recovery\n");
327 set_sleep_mode(md, 1);
328 set_sleep_mode(md, 0);
329}
330
331static void ls041y3_esd_check_mode1(struct mipid_device *md)
332{
333 u8 state1, state2;
334
335 mipid_read(md, MIPID_CMD_RDDSDR, &state1, 1);
336 set_sleep_mode(md, 0);
337 mipid_read(md, MIPID_CMD_RDDSDR, &state2, 1);
338 dev_dbg(&md->spi->dev, "ESD mode 1 state1 %02x state2 %02x\n",
339 state1, state2);
340 /* Each sleep out command will trigger a self diagnostic and flip
341 * Bit6 if the test passes.
342 */
343 if (!((state1 ^ state2) & (1 << 6)))
344 ls041y3_esd_recover(md);
345}
346
347static void ls041y3_esd_check_mode2(struct mipid_device *md)
348{
349 int i;
350 u8 rbuf[2];
351 static const struct {
352 int cmd;
353 int wlen;
354 u16 wbuf[3];
355 } *rd, rd_ctrl[7] = {
356 { 0xb0, 4, { 0x0101, 0x01fe, } },
357 { 0xb1, 4, { 0x01de, 0x0121, } },
358 { 0xc2, 4, { 0x0100, 0x0100, } },
359 { 0xbd, 2, { 0x0100, } },
360 { 0xc2, 4, { 0x01fc, 0x0103, } },
361 { 0xb4, 0, },
362 { 0x00, 0, },
363 };
364
365 rd = rd_ctrl;
366 for (i = 0; i < 3; i++, rd++)
367 mipid_write(md, rd->cmd, (u8 *)rd->wbuf, rd->wlen);
368
369 udelay(10);
370 mipid_read(md, rd->cmd, rbuf, 2);
371 rd++;
372
373 for (i = 0; i < 3; i++, rd++) {
374 udelay(10);
375 mipid_write(md, rd->cmd, (u8 *)rd->wbuf, rd->wlen);
376 }
377
378 dev_dbg(&md->spi->dev, "ESD mode 2 state %02x\n", rbuf[1]);
379 if (rbuf[1] == 0x00)
380 ls041y3_esd_recover(md);
381}
382
383static void ls041y3_esd_check(struct mipid_device *md)
384{
385 ls041y3_esd_check_mode1(md);
386 if (md->revision >= 0x88)
387 ls041y3_esd_check_mode2(md);
388}
389
390static void mipid_esd_start_check(struct mipid_device *md)
391{
392 if (md->esd_check != NULL)
393 queue_delayed_work(md->esd_wq, &md->esd_work,
394 MIPID_ESD_CHECK_PERIOD);
395}
396
397static void mipid_esd_stop_check(struct mipid_device *md)
398{
399 if (md->esd_check != NULL)
400 cancel_delayed_work_sync(&md->esd_work);
401}
402
403static void mipid_esd_work(struct work_struct *work)
404{
405 struct mipid_device *md = container_of(work, struct mipid_device,
406 esd_work.work);
407
408 mutex_lock(&md->mutex);
409 md->esd_check(md);
410 mutex_unlock(&md->mutex);
411 mipid_esd_start_check(md);
412}
413
414static int mipid_enable(struct lcd_panel *panel)
415{
416 struct mipid_device *md = to_mipid_device(panel);
417
418 mutex_lock(&md->mutex);
419
420 if (md->enabled) {
421 mutex_unlock(&md->mutex);
422 return 0;
423 }
424 set_sleep_mode(md, 0);
425 md->enabled = 1;
426 send_init_string(md);
427 set_display_state(md, 1);
428 mipid_set_bklight_level(panel, md->saved_bklight_level);
429 mipid_esd_start_check(md);
430
431 mutex_unlock(&md->mutex);
432 return 0;
433}
434
435static void mipid_disable(struct lcd_panel *panel)
436{
437 struct mipid_device *md = to_mipid_device(panel);
438
439 /*
440 * A final ESD work might be called before returning,
441 * so do this without holding the lock.
442 */
443 mipid_esd_stop_check(md);
444 mutex_lock(&md->mutex);
445
446 if (!md->enabled) {
447 mutex_unlock(&md->mutex);
448 return;
449 }
450 md->saved_bklight_level = mipid_get_bklight_level(panel);
451 mipid_set_bklight_level(panel, 0);
452 set_display_state(md, 0);
453 set_sleep_mode(md, 1);
454 md->enabled = 0;
455
456 mutex_unlock(&md->mutex);
457}
458
459static int panel_enabled(struct mipid_device *md)
460{
461 u32 disp_status;
462 int enabled;
463
464 mipid_read(md, MIPID_CMD_READ_DISP_STATUS, (u8 *)&disp_status, 4);
465 disp_status = __be32_to_cpu(disp_status);
466 enabled = (disp_status & (1 << 17)) && (disp_status & (1 << 10));
467 dev_dbg(&md->spi->dev,
468 "LCD panel %senabled by bootloader (status 0x%04x)\n",
469 enabled ? "" : "not ", disp_status);
470 return enabled;
471}
472
473static int mipid_init(struct lcd_panel *panel,
474 struct omapfb_device *fbdev)
475{
476 struct mipid_device *md = to_mipid_device(panel);
477
478 md->fbdev = fbdev;
479 md->esd_wq = create_singlethread_workqueue("mipid_esd");
480 if (md->esd_wq == NULL) {
481 dev_err(&md->spi->dev, "can't create ESD workqueue\n");
482 return -ENOMEM;
483 }
484 INIT_DELAYED_WORK(&md->esd_work, mipid_esd_work);
485 mutex_init(&md->mutex);
486
487 md->enabled = panel_enabled(md);
488
489 if (md->enabled)
490 mipid_esd_start_check(md);
491 else
492 md->saved_bklight_level = mipid_get_bklight_level(panel);
493
494 return 0;
495}
496
497static void mipid_cleanup(struct lcd_panel *panel)
498{
499 struct mipid_device *md = to_mipid_device(panel);
500
501 if (md->enabled)
502 mipid_esd_stop_check(md);
503 destroy_workqueue(md->esd_wq);
504}
505
506static struct lcd_panel mipid_panel = {
507 .config = OMAP_LCDC_PANEL_TFT,
508
509 .bpp = 16,
510 .x_res = 800,
511 .y_res = 480,
512 .pixel_clock = 21940,
513 .hsw = 50,
514 .hfp = 20,
515 .hbp = 15,
516 .vsw = 2,
517 .vfp = 1,
518 .vbp = 3,
519
520 .init = mipid_init,
521 .cleanup = mipid_cleanup,
522 .enable = mipid_enable,
523 .disable = mipid_disable,
524 .get_caps = mipid_get_caps,
525 .set_bklight_level = mipid_set_bklight_level,
526 .get_bklight_level = mipid_get_bklight_level,
527 .get_bklight_max = mipid_get_bklight_max,
528 .run_test = mipid_run_test,
529};
530
531static int mipid_detect(struct mipid_device *md)
532{
533 struct mipid_platform_data *pdata;
534 u8 display_id[3];
535
536 pdata = md->spi->dev.platform_data;
537 if (pdata == NULL) {
538 dev_err(&md->spi->dev, "missing platform data\n");
539 return -ENOENT;
540 }
541
542 mipid_read(md, MIPID_CMD_READ_DISP_ID, display_id, 3);
543 dev_dbg(&md->spi->dev, "MIPI display ID: %02x%02x%02x\n",
544 display_id[0], display_id[1], display_id[2]);
545
546 switch (display_id[0]) {
547 case 0x45:
548 md->panel.name = "lph8923";
549 break;
550 case 0x83:
551 md->panel.name = "ls041y3";
552 md->esd_check = ls041y3_esd_check;
553 break;
554 default:
555 md->panel.name = "unknown";
556 dev_err(&md->spi->dev, "invalid display ID\n");
557 return -ENODEV;
558 }
559
560 md->revision = display_id[1];
561 md->panel.data_lines = pdata->data_lines;
562 pr_info("omapfb: %s rev %02x LCD detected, %d data lines\n",
563 md->panel.name, md->revision, md->panel.data_lines);
564
565 return 0;
566}
567
568static int mipid_spi_probe(struct spi_device *spi)
569{
570 struct mipid_device *md;
571 int r;
572
573 md = kzalloc(sizeof(*md), GFP_KERNEL);
574 if (md == NULL) {
575 dev_err(&spi->dev, "out of memory\n");
576 return -ENOMEM;
577 }
578
579 spi->mode = SPI_MODE_0;
580 md->spi = spi;
581 dev_set_drvdata(&spi->dev, md);
582 md->panel = mipid_panel;
583
584 r = mipid_detect(md);
585 if (r < 0)
586 return r;
587
588 omapfb_register_panel(&md->panel);
589
590 return 0;
591}
592
593static int mipid_spi_remove(struct spi_device *spi)
594{
595 struct mipid_device *md = dev_get_drvdata(&spi->dev);
596
597 mipid_disable(&md->panel);
598 kfree(md);
599
600 return 0;
601}
602
603static struct spi_driver mipid_spi_driver = {
604 .driver = {
605 .name = MIPID_MODULE_NAME,
606 .owner = THIS_MODULE,
607 },
608 .probe = mipid_spi_probe,
609 .remove = mipid_spi_remove,
610};
611
612module_spi_driver(mipid_spi_driver);
613
614MODULE_DESCRIPTION("MIPI display driver");
615MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2026-04-27 14:39:55 -0400