1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4 * Copyright (c) 2019-2020. Linaro Limited.
5 */
6
7#include <linux/firmware.h>
8#include <linux/gpio/consumer.h>
9#include <linux/i2c.h>
10#include <linux/interrupt.h>
11#include <linux/module.h>
12#include <linux/mutex.h>
13#include <linux/of_graph.h>
14#include <linux/platform_device.h>
15#include <linux/regmap.h>
16#include <linux/regulator/consumer.h>
17#include <linux/wait.h>
18#include <linux/workqueue.h>
19
20#include <sound/hdmi-codec.h>
21
22#include <drm/drm_atomic_helper.h>
23#include <drm/drm_bridge.h>
24#include <drm/drm_edid.h>
25#include <drm/drm_mipi_dsi.h>
26#include <drm/drm_of.h>
27#include <drm/drm_print.h>
28#include <drm/drm_probe_helper.h>
29
30#define EDID_BLOCK_SIZE 128
31#define EDID_NUM_BLOCKS 2
32
33#define FW_FILE "lt9611uxc_fw.bin"
34
35struct lt9611uxc {
36 struct device *dev;
37 struct drm_bridge bridge;
38 struct drm_bridge *next_bridge;
39
40 struct regmap *regmap;
41 /* Protects all accesses to registers by stopping the on-chip MCU */
42 struct mutex ocm_lock;
43
44 struct wait_queue_head wq;
45 struct work_struct work;
46
47 struct device_node *dsi0_node;
48 struct device_node *dsi1_node;
49 struct mipi_dsi_device *dsi0;
50 struct mipi_dsi_device *dsi1;
51 struct platform_device *audio_pdev;
52
53 struct gpio_desc *reset_gpio;
54 struct gpio_desc *enable_gpio;
55
56 struct regulator_bulk_data supplies[2];
57
58 struct i2c_client *client;
59
60 bool hpd_supported;
61 bool edid_read;
62 /* can be accessed from different threads, so protect this with ocm_lock */
63 bool hdmi_connected;
64 uint8_t fw_version;
65};
66
67#define LT9611_PAGE_CONTROL 0xff
68
69static const struct regmap_range_cfg lt9611uxc_ranges[] = {
70 {
71 .name = "register_range",
72 .range_min = 0,
73 .range_max = 0xd0ff,
74 .selector_reg = LT9611_PAGE_CONTROL,
75 .selector_mask = 0xff,
76 .selector_shift = 0,
77 .window_start = 0,
78 .window_len = 0x100,
79 },
80};
81
82static const struct regmap_config lt9611uxc_regmap_config = {
83 .reg_bits = 8,
84 .val_bits = 8,
85 .max_register = 0xffff,
86 .ranges = lt9611uxc_ranges,
87 .num_ranges = ARRAY_SIZE(lt9611uxc_ranges),
88};
89
90struct lt9611uxc_mode {
91 u16 hdisplay;
92 u16 vdisplay;
93 u8 vrefresh;
94};
95
96/*
97 * This chip supports only a fixed set of modes.
98 * Enumerate them here to check whether the mode is supported.
99 */
100static struct lt9611uxc_mode lt9611uxc_modes[] = {
101 { 1920, 1080, 60 },
102 { 1920, 1080, 30 },
103 { 1920, 1080, 25 },
104 { 1366, 768, 60 },
105 { 1360, 768, 60 },
106 { 1280, 1024, 60 },
107 { 1280, 800, 60 },
108 { 1280, 720, 60 },
109 { 1280, 720, 50 },
110 { 1280, 720, 30 },
111 { 1152, 864, 60 },
112 { 1024, 768, 60 },
113 { 800, 600, 60 },
114 { 720, 576, 50 },
115 { 720, 480, 60 },
116 { 640, 480, 60 },
117};
118
119static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
120{
121 return container_of(bridge, struct lt9611uxc, bridge);
122}
123
124static void lt9611uxc_lock(struct lt9611uxc *lt9611uxc)
125{
126 mutex_lock(&lt9611uxc->ocm_lock);
127 regmap_write(map: lt9611uxc->regmap, reg: 0x80ee, val: 0x01);
128}
129
130static void lt9611uxc_unlock(struct lt9611uxc *lt9611uxc)
131{
132 regmap_write(map: lt9611uxc->regmap, reg: 0x80ee, val: 0x00);
133 msleep(msecs: 50);
134 mutex_unlock(lock: &lt9611uxc->ocm_lock);
135}
136
137static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
138{
139 struct lt9611uxc *lt9611uxc = dev_id;
140 unsigned int irq_status = 0;
141 unsigned int hpd_status = 0;
142
143 lt9611uxc_lock(lt9611uxc);
144
145 regmap_read(map: lt9611uxc->regmap, reg: 0xb022, val: &irq_status);
146 regmap_read(map: lt9611uxc->regmap, reg: 0xb023, val: &hpd_status);
147 if (irq_status)
148 regmap_write(map: lt9611uxc->regmap, reg: 0xb022, val: 0);
149
150 if (irq_status & BIT(0)) {
151 lt9611uxc->edid_read = !!(hpd_status & BIT(0));
152 wake_up_all(&lt9611uxc->wq);
153 }
154
155 if (irq_status & BIT(1)) {
156 lt9611uxc->hdmi_connected = hpd_status & BIT(1);
157 schedule_work(work: &lt9611uxc->work);
158 }
159
160 lt9611uxc_unlock(lt9611uxc);
161
162 return IRQ_HANDLED;
163}
164
165static void lt9611uxc_hpd_work(struct work_struct *work)
166{
167 struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work);
168 bool connected;
169
170 mutex_lock(&lt9611uxc->ocm_lock);
171 connected = lt9611uxc->hdmi_connected;
172 mutex_unlock(lock: &lt9611uxc->ocm_lock);
173
174 drm_bridge_hpd_notify(bridge: &lt9611uxc->bridge,
175 status: connected ?
176 connector_status_connected :
177 connector_status_disconnected);
178}
179
180static void lt9611uxc_reset(struct lt9611uxc *lt9611uxc)
181{
182 gpiod_set_value_cansleep(desc: lt9611uxc->reset_gpio, value: 1);
183 msleep(msecs: 20);
184
185 gpiod_set_value_cansleep(desc: lt9611uxc->reset_gpio, value: 0);
186 msleep(msecs: 20);
187
188 gpiod_set_value_cansleep(desc: lt9611uxc->reset_gpio, value: 1);
189 msleep(msecs: 300);
190}
191
192static void lt9611uxc_assert_5v(struct lt9611uxc *lt9611uxc)
193{
194 if (!lt9611uxc->enable_gpio)
195 return;
196
197 gpiod_set_value_cansleep(desc: lt9611uxc->enable_gpio, value: 1);
198 msleep(msecs: 20);
199}
200
201static int lt9611uxc_regulator_init(struct lt9611uxc *lt9611uxc)
202{
203 int ret;
204
205 lt9611uxc->supplies[0].supply = "vdd";
206 lt9611uxc->supplies[1].supply = "vcc";
207
208 ret = devm_regulator_bulk_get(dev: lt9611uxc->dev, num_consumers: 2, consumers: lt9611uxc->supplies);
209 if (ret < 0)
210 return ret;
211
212 return regulator_set_load(regulator: lt9611uxc->supplies[0].consumer, load_uA: 200000);
213}
214
215static int lt9611uxc_regulator_enable(struct lt9611uxc *lt9611uxc)
216{
217 int ret;
218
219 ret = regulator_enable(regulator: lt9611uxc->supplies[0].consumer);
220 if (ret < 0)
221 return ret;
222
223 usleep_range(min: 1000, max: 10000); /* 50000 according to dtsi */
224
225 ret = regulator_enable(regulator: lt9611uxc->supplies[1].consumer);
226 if (ret < 0) {
227 regulator_disable(regulator: lt9611uxc->supplies[0].consumer);
228 return ret;
229 }
230
231 return 0;
232}
233
234static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode *mode)
235{
236 int i;
237
238 for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
239 if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
240 lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
241 lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
242 return &lt9611uxc_modes[i];
243 }
244 }
245
246 return NULL;
247}
248
249static struct mipi_dsi_device *lt9611uxc_attach_dsi(struct lt9611uxc *lt9611uxc,
250 struct device_node *dsi_node)
251{
252 const struct mipi_dsi_device_info info = { "lt9611uxc", 0, NULL };
253 struct mipi_dsi_device *dsi;
254 struct mipi_dsi_host *host;
255 struct device *dev = lt9611uxc->dev;
256 int ret;
257
258 host = of_find_mipi_dsi_host_by_node(node: dsi_node);
259 if (!host)
260 return ERR_PTR(error: dev_err_probe(dev, err: -EPROBE_DEFER, fmt: "failed to find dsi host\n"));
261
262 dsi = devm_mipi_dsi_device_register_full(dev, host, info: &info);
263 if (IS_ERR(ptr: dsi)) {
264 dev_err(dev, "failed to create dsi device\n");
265 return dsi;
266 }
267
268 dsi->lanes = 4;
269 dsi->format = MIPI_DSI_FMT_RGB888;
270 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
271 MIPI_DSI_MODE_VIDEO_HSE;
272
273 ret = devm_mipi_dsi_attach(dev, dsi);
274 if (ret < 0) {
275 dev_err(dev, "failed to attach dsi to host\n");
276 return ERR_PTR(error: ret);
277 }
278
279 return dsi;
280}
281
282static int lt9611uxc_bridge_attach(struct drm_bridge *bridge,
283 struct drm_encoder *encoder,
284 enum drm_bridge_attach_flags flags)
285{
286 struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
287
288 return drm_bridge_attach(encoder, bridge: lt9611uxc->next_bridge,
289 previous: bridge, flags);
290}
291
292static enum drm_mode_status
293lt9611uxc_bridge_mode_valid(struct drm_bridge *bridge,
294 const struct drm_display_info *info,
295 const struct drm_display_mode *mode)
296{
297 struct lt9611uxc_mode *lt9611uxc_mode;
298
299 lt9611uxc_mode = lt9611uxc_find_mode(mode);
300
301 return lt9611uxc_mode ? MODE_OK : MODE_BAD;
302}
303
304static void lt9611uxc_video_setup(struct lt9611uxc *lt9611uxc,
305 const struct drm_display_mode *mode)
306{
307 u32 h_total, hactive, hsync_len, hfront_porch;
308 u32 v_total, vactive, vsync_len, vfront_porch;
309
310 h_total = mode->htotal;
311 v_total = mode->vtotal;
312
313 hactive = mode->hdisplay;
314 hsync_len = mode->hsync_end - mode->hsync_start;
315 hfront_porch = mode->hsync_start - mode->hdisplay;
316
317 vactive = mode->vdisplay;
318 vsync_len = mode->vsync_end - mode->vsync_start;
319 vfront_porch = mode->vsync_start - mode->vdisplay;
320
321 regmap_write(map: lt9611uxc->regmap, reg: 0xd00d, val: (u8)(v_total / 256));
322 regmap_write(map: lt9611uxc->regmap, reg: 0xd00e, val: (u8)(v_total % 256));
323
324 regmap_write(map: lt9611uxc->regmap, reg: 0xd00f, val: (u8)(vactive / 256));
325 regmap_write(map: lt9611uxc->regmap, reg: 0xd010, val: (u8)(vactive % 256));
326
327 regmap_write(map: lt9611uxc->regmap, reg: 0xd011, val: (u8)(h_total / 256));
328 regmap_write(map: lt9611uxc->regmap, reg: 0xd012, val: (u8)(h_total % 256));
329
330 regmap_write(map: lt9611uxc->regmap, reg: 0xd013, val: (u8)(hactive / 256));
331 regmap_write(map: lt9611uxc->regmap, reg: 0xd014, val: (u8)(hactive % 256));
332
333 regmap_write(map: lt9611uxc->regmap, reg: 0xd015, val: (u8)(vsync_len % 256));
334
335 regmap_update_bits(map: lt9611uxc->regmap, reg: 0xd016, mask: 0xf, val: (u8)(hsync_len / 256));
336 regmap_write(map: lt9611uxc->regmap, reg: 0xd017, val: (u8)(hsync_len % 256));
337
338 regmap_update_bits(map: lt9611uxc->regmap, reg: 0xd018, mask: 0xf, val: (u8)(vfront_porch / 256));
339 regmap_write(map: lt9611uxc->regmap, reg: 0xd019, val: (u8)(vfront_porch % 256));
340
341 regmap_update_bits(map: lt9611uxc->regmap, reg: 0xd01a, mask: 0xf, val: (u8)(hfront_porch / 256));
342 regmap_write(map: lt9611uxc->regmap, reg: 0xd01b, val: (u8)(hfront_porch % 256));
343}
344
345static void lt9611uxc_bridge_mode_set(struct drm_bridge *bridge,
346 const struct drm_display_mode *mode,
347 const struct drm_display_mode *adj_mode)
348{
349 struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
350
351 lt9611uxc_lock(lt9611uxc);
352 lt9611uxc_video_setup(lt9611uxc, mode);
353 lt9611uxc_unlock(lt9611uxc);
354}
355
356static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *bridge)
357{
358 struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
359 unsigned int reg_val = 0;
360 int ret;
361 bool connected = true;
362
363 lt9611uxc_lock(lt9611uxc);
364
365 if (lt9611uxc->hpd_supported) {
366 ret = regmap_read(map: lt9611uxc->regmap, reg: 0xb023, val: &reg_val);
367
368 if (ret)
369 dev_err(lt9611uxc->dev, "failed to read hpd status: %d\n", ret);
370 else
371 connected = reg_val & BIT(1);
372 }
373 lt9611uxc->hdmi_connected = connected;
374
375 lt9611uxc_unlock(lt9611uxc);
376
377 return connected ? connector_status_connected :
378 connector_status_disconnected;
379}
380
381static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
382{
383 return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
384 msecs_to_jiffies(500));
385}
386
387static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
388{
389 struct lt9611uxc *lt9611uxc = data;
390 int ret;
391
392 if (len > EDID_BLOCK_SIZE)
393 return -EINVAL;
394
395 if (block >= EDID_NUM_BLOCKS)
396 return -EINVAL;
397
398 lt9611uxc_lock(lt9611uxc);
399
400 regmap_write(map: lt9611uxc->regmap, reg: 0xb00b, val: 0x10);
401
402 regmap_write(map: lt9611uxc->regmap, reg: 0xb00a, val: block * EDID_BLOCK_SIZE);
403
404 ret = regmap_noinc_read(map: lt9611uxc->regmap, reg: 0xb0b0, val: buf, val_len: len);
405 if (ret)
406 dev_err(lt9611uxc->dev, "edid read failed: %d\n", ret);
407
408 lt9611uxc_unlock(lt9611uxc);
409
410 return 0;
411};
412
413static const struct drm_edid *lt9611uxc_bridge_edid_read(struct drm_bridge *bridge,
414 struct drm_connector *connector)
415{
416 struct lt9611uxc *lt9611uxc = bridge_to_lt9611uxc(bridge);
417 int ret;
418
419 ret = lt9611uxc_wait_for_edid(lt9611uxc);
420 if (ret < 0) {
421 dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
422 return NULL;
423 } else if (ret == 0) {
424 dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
425 return NULL;
426 }
427
428 return drm_edid_read_custom(connector, read_block: lt9611uxc_get_edid_block, context: lt9611uxc);
429}
430
431static const struct drm_bridge_funcs lt9611uxc_bridge_funcs = {
432 .attach = lt9611uxc_bridge_attach,
433 .mode_valid = lt9611uxc_bridge_mode_valid,
434 .mode_set = lt9611uxc_bridge_mode_set,
435 .detect = lt9611uxc_bridge_detect,
436 .edid_read = lt9611uxc_bridge_edid_read,
437};
438
439static int lt9611uxc_parse_dt(struct device *dev,
440 struct lt9611uxc *lt9611uxc)
441{
442 lt9611uxc->dsi0_node = of_graph_get_remote_node(node: dev->of_node, port: 0, endpoint: -1);
443 if (!lt9611uxc->dsi0_node) {
444 dev_err(lt9611uxc->dev, "failed to get remote node for primary dsi\n");
445 return -ENODEV;
446 }
447
448 lt9611uxc->dsi1_node = of_graph_get_remote_node(node: dev->of_node, port: 1, endpoint: -1);
449
450 return drm_of_find_panel_or_bridge(np: dev->of_node, port: 2, endpoint: -1, NULL, bridge: &lt9611uxc->next_bridge);
451}
452
453static int lt9611uxc_gpio_init(struct lt9611uxc *lt9611uxc)
454{
455 struct device *dev = lt9611uxc->dev;
456
457 lt9611uxc->reset_gpio = devm_gpiod_get(dev, con_id: "reset", flags: GPIOD_OUT_HIGH);
458 if (IS_ERR(ptr: lt9611uxc->reset_gpio)) {
459 dev_err(dev, "failed to acquire reset gpio\n");
460 return PTR_ERR(ptr: lt9611uxc->reset_gpio);
461 }
462
463 lt9611uxc->enable_gpio = devm_gpiod_get_optional(dev, con_id: "enable", flags: GPIOD_OUT_LOW);
464 if (IS_ERR(ptr: lt9611uxc->enable_gpio)) {
465 dev_err(dev, "failed to acquire enable gpio\n");
466 return PTR_ERR(ptr: lt9611uxc->enable_gpio);
467 }
468
469 return 0;
470}
471
472static int lt9611uxc_read_device_rev(struct lt9611uxc *lt9611uxc)
473{
474 unsigned int rev0, rev1, rev2;
475 int ret;
476
477 lt9611uxc_lock(lt9611uxc);
478
479 ret = regmap_read(map: lt9611uxc->regmap, reg: 0x8100, val: &rev0);
480 ret |= regmap_read(map: lt9611uxc->regmap, reg: 0x8101, val: &rev1);
481 ret |= regmap_read(map: lt9611uxc->regmap, reg: 0x8102, val: &rev2);
482 if (ret)
483 dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
484 else
485 dev_info(lt9611uxc->dev, "LT9611 revision: 0x%02x.%02x.%02x\n", rev0, rev1, rev2);
486
487 lt9611uxc_unlock(lt9611uxc);
488
489 return ret;
490}
491
492static int lt9611uxc_read_version(struct lt9611uxc *lt9611uxc)
493{
494 unsigned int rev;
495 int ret;
496
497 lt9611uxc_lock(lt9611uxc);
498
499 ret = regmap_read(map: lt9611uxc->regmap, reg: 0xb021, val: &rev);
500 if (ret)
501 dev_err(lt9611uxc->dev, "failed to read revision: %d\n", ret);
502 else
503 dev_info(lt9611uxc->dev, "LT9611 version: 0x%02x\n", rev);
504
505 lt9611uxc_unlock(lt9611uxc);
506
507 return ret < 0 ? ret : rev;
508}
509
510static int lt9611uxc_hdmi_hw_params(struct device *dev, void *data,
511 struct hdmi_codec_daifmt *fmt,
512 struct hdmi_codec_params *hparms)
513{
514 /*
515 * LT9611UXC will automatically detect rate and sample size, so no need
516 * to setup anything here.
517 */
518 return 0;
519}
520
521static void lt9611uxc_audio_shutdown(struct device *dev, void *data)
522{
523}
524
525static int lt9611uxc_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
526 struct device_node *endpoint,
527 void *data)
528{
529 struct of_endpoint of_ep;
530 int ret;
531
532 ret = of_graph_parse_endpoint(node: endpoint, endpoint: &of_ep);
533 if (ret < 0)
534 return ret;
535
536 /*
537 * HDMI sound should be located as reg = <2>
538 * Then, it is sound port 0
539 */
540 if (of_ep.port == 2)
541 return 0;
542
543 return -EINVAL;
544}
545
546static const struct hdmi_codec_ops lt9611uxc_codec_ops = {
547 .hw_params = lt9611uxc_hdmi_hw_params,
548 .audio_shutdown = lt9611uxc_audio_shutdown,
549 .get_dai_id = lt9611uxc_hdmi_i2s_get_dai_id,
550};
551
552static int lt9611uxc_audio_init(struct device *dev, struct lt9611uxc *lt9611uxc)
553{
554 struct hdmi_codec_pdata codec_data = {
555 .ops = &lt9611uxc_codec_ops,
556 .max_i2s_channels = 2,
557 .i2s = 1,
558 .data = lt9611uxc,
559 };
560
561 lt9611uxc->audio_pdev =
562 platform_device_register_data(parent: dev, HDMI_CODEC_DRV_NAME,
563 PLATFORM_DEVID_AUTO,
564 data: &codec_data, size: sizeof(codec_data));
565
566 return PTR_ERR_OR_ZERO(ptr: lt9611uxc->audio_pdev);
567}
568
569static void lt9611uxc_audio_exit(struct lt9611uxc *lt9611uxc)
570{
571 if (lt9611uxc->audio_pdev) {
572 platform_device_unregister(lt9611uxc->audio_pdev);
573 lt9611uxc->audio_pdev = NULL;
574 }
575}
576
577#define LT9611UXC_FW_PAGE_SIZE 32
578static void lt9611uxc_firmware_write_page(struct lt9611uxc *lt9611uxc, u16 addr, const u8 *buf)
579{
580 struct reg_sequence seq_write_prepare[] = {
581 REG_SEQ0(0x805a, 0x04),
582 REG_SEQ0(0x805a, 0x00),
583
584 REG_SEQ0(0x805e, 0xdf),
585 REG_SEQ0(0x805a, 0x20),
586 REG_SEQ0(0x805a, 0x00),
587 REG_SEQ0(0x8058, 0x21),
588 };
589
590 struct reg_sequence seq_write_addr[] = {
591 REG_SEQ0(0x805b, (addr >> 16) & 0xff),
592 REG_SEQ0(0x805c, (addr >> 8) & 0xff),
593 REG_SEQ0(0x805d, addr & 0xff),
594 REG_SEQ0(0x805a, 0x10),
595 REG_SEQ0(0x805a, 0x00),
596 };
597
598 regmap_write(map: lt9611uxc->regmap, reg: 0x8108, val: 0xbf);
599 msleep(msecs: 20);
600 regmap_write(map: lt9611uxc->regmap, reg: 0x8108, val: 0xff);
601 msleep(msecs: 20);
602 regmap_multi_reg_write(map: lt9611uxc->regmap, regs: seq_write_prepare, ARRAY_SIZE(seq_write_prepare));
603 regmap_noinc_write(map: lt9611uxc->regmap, reg: 0x8059, val: buf, LT9611UXC_FW_PAGE_SIZE);
604 regmap_multi_reg_write(map: lt9611uxc->regmap, regs: seq_write_addr, ARRAY_SIZE(seq_write_addr));
605 msleep(msecs: 20);
606}
607
608static void lt9611uxc_firmware_read_page(struct lt9611uxc *lt9611uxc, u16 addr, char *buf)
609{
610 struct reg_sequence seq_read_page[] = {
611 REG_SEQ0(0x805a, 0xa0),
612 REG_SEQ0(0x805a, 0x80),
613 REG_SEQ0(0x805b, (addr >> 16) & 0xff),
614 REG_SEQ0(0x805c, (addr >> 8) & 0xff),
615 REG_SEQ0(0x805d, addr & 0xff),
616 REG_SEQ0(0x805a, 0x90),
617 REG_SEQ0(0x805a, 0x80),
618 REG_SEQ0(0x8058, 0x21),
619 };
620
621 regmap_multi_reg_write(map: lt9611uxc->regmap, regs: seq_read_page, ARRAY_SIZE(seq_read_page));
622 regmap_noinc_read(map: lt9611uxc->regmap, reg: 0x805f, val: buf, LT9611UXC_FW_PAGE_SIZE);
623}
624
625static char *lt9611uxc_firmware_read(struct lt9611uxc *lt9611uxc, size_t size)
626{
627 struct reg_sequence seq_read_setup[] = {
628 REG_SEQ0(0x805a, 0x84),
629 REG_SEQ0(0x805a, 0x80),
630 };
631
632 char *readbuf;
633 u16 offset;
634
635 readbuf = kzalloc(ALIGN(size, 32), GFP_KERNEL);
636 if (!readbuf)
637 return NULL;
638
639 regmap_multi_reg_write(map: lt9611uxc->regmap, regs: seq_read_setup, ARRAY_SIZE(seq_read_setup));
640
641 for (offset = 0;
642 offset < size;
643 offset += LT9611UXC_FW_PAGE_SIZE)
644 lt9611uxc_firmware_read_page(lt9611uxc, addr: offset, buf: &readbuf[offset]);
645
646 return readbuf;
647}
648
649static int lt9611uxc_firmware_update(struct lt9611uxc *lt9611uxc)
650{
651 int ret;
652 u16 offset;
653 size_t remain;
654 char *readbuf;
655 const struct firmware *fw;
656
657 struct reg_sequence seq_setup[] = {
658 REG_SEQ0(0x805e, 0xdf),
659 REG_SEQ0(0x8058, 0x00),
660 REG_SEQ0(0x8059, 0x50),
661 REG_SEQ0(0x805a, 0x10),
662 REG_SEQ0(0x805a, 0x00),
663 };
664
665
666 struct reg_sequence seq_block_erase[] = {
667 REG_SEQ0(0x805a, 0x04),
668 REG_SEQ0(0x805a, 0x00),
669 REG_SEQ0(0x805b, 0x00),
670 REG_SEQ0(0x805c, 0x00),
671 REG_SEQ0(0x805d, 0x00),
672 REG_SEQ0(0x805a, 0x01),
673 REG_SEQ0(0x805a, 0x00),
674 };
675
676 ret = request_firmware(fw: &fw, FW_FILE, device: lt9611uxc->dev);
677 if (ret < 0)
678 return ret;
679
680 dev_info(lt9611uxc->dev, "Updating firmware\n");
681 lt9611uxc_lock(lt9611uxc);
682
683 regmap_multi_reg_write(map: lt9611uxc->regmap, regs: seq_setup, ARRAY_SIZE(seq_setup));
684
685 /*
686 * Need erase block 2 timess here. Sometimes, block erase can fail.
687 * This is a workaroud.
688 */
689 regmap_multi_reg_write(map: lt9611uxc->regmap, regs: seq_block_erase, ARRAY_SIZE(seq_block_erase));
690 msleep(msecs: 3000);
691 regmap_multi_reg_write(map: lt9611uxc->regmap, regs: seq_block_erase, ARRAY_SIZE(seq_block_erase));
692 msleep(msecs: 3000);
693
694 for (offset = 0, remain = fw->size;
695 remain >= LT9611UXC_FW_PAGE_SIZE;
696 offset += LT9611UXC_FW_PAGE_SIZE, remain -= LT9611UXC_FW_PAGE_SIZE)
697 lt9611uxc_firmware_write_page(lt9611uxc, addr: offset, buf: fw->data + offset);
698
699 if (remain > 0) {
700 char buf[LT9611UXC_FW_PAGE_SIZE];
701
702 memset(buf, 0xff, LT9611UXC_FW_PAGE_SIZE);
703 memcpy(buf, fw->data + offset, remain);
704 lt9611uxc_firmware_write_page(lt9611uxc, addr: offset, buf);
705 }
706 msleep(msecs: 20);
707
708 readbuf = lt9611uxc_firmware_read(lt9611uxc, size: fw->size);
709 if (!readbuf) {
710 ret = -ENOMEM;
711 goto out;
712 }
713
714 if (!memcmp(p: readbuf, q: fw->data, size: fw->size)) {
715 dev_err(lt9611uxc->dev, "Firmware update failed\n");
716 print_hex_dump(KERN_ERR, prefix_str: "fw: ", prefix_type: DUMP_PREFIX_OFFSET, rowsize: 16, groupsize: 1, buf: readbuf, len: fw->size, ascii: false);
717 ret = -EINVAL;
718 } else {
719 dev_info(lt9611uxc->dev, "Firmware updates successfully\n");
720 ret = 0;
721 }
722 kfree(objp: readbuf);
723
724out:
725 lt9611uxc_unlock(lt9611uxc);
726 lt9611uxc_reset(lt9611uxc);
727 release_firmware(fw);
728
729 return ret;
730}
731
732static ssize_t lt9611uxc_firmware_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
733{
734 struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
735 int ret;
736
737 ret = lt9611uxc_firmware_update(lt9611uxc);
738 if (ret < 0)
739 return ret;
740 return len;
741}
742
743static ssize_t lt9611uxc_firmware_show(struct device *dev, struct device_attribute *attr, char *buf)
744{
745 struct lt9611uxc *lt9611uxc = dev_get_drvdata(dev);
746
747 return sysfs_emit(buf, fmt: "%02x\n", lt9611uxc->fw_version);
748}
749
750static DEVICE_ATTR_RW(lt9611uxc_firmware);
751
752static struct attribute *lt9611uxc_attrs[] = {
753 &dev_attr_lt9611uxc_firmware.attr,
754 NULL,
755};
756
757static const struct attribute_group lt9611uxc_attr_group = {
758 .attrs = lt9611uxc_attrs,
759};
760
761static const struct attribute_group *lt9611uxc_attr_groups[] = {
762 &lt9611uxc_attr_group,
763 NULL,
764};
765
766static int lt9611uxc_probe(struct i2c_client *client)
767{
768 struct lt9611uxc *lt9611uxc;
769 struct device *dev = &client->dev;
770 int ret;
771 bool fw_updated = false;
772
773 if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_I2C)) {
774 dev_err(dev, "device doesn't support I2C\n");
775 return -ENODEV;
776 }
777
778 lt9611uxc = devm_drm_bridge_alloc(dev, struct lt9611uxc, bridge, &lt9611uxc_bridge_funcs);
779 if (IS_ERR(ptr: lt9611uxc))
780 return PTR_ERR(ptr: lt9611uxc);
781
782 lt9611uxc->dev = dev;
783 lt9611uxc->client = client;
784 mutex_init(&lt9611uxc->ocm_lock);
785
786 lt9611uxc->regmap = devm_regmap_init_i2c(client, &lt9611uxc_regmap_config);
787 if (IS_ERR(ptr: lt9611uxc->regmap)) {
788 dev_err(lt9611uxc->dev, "regmap i2c init failed\n");
789 return PTR_ERR(ptr: lt9611uxc->regmap);
790 }
791
792 ret = lt9611uxc_parse_dt(dev, lt9611uxc);
793 if (ret) {
794 dev_err(dev, "failed to parse device tree\n");
795 return ret;
796 }
797
798 ret = lt9611uxc_gpio_init(lt9611uxc);
799 if (ret < 0)
800 goto err_of_put;
801
802 ret = lt9611uxc_regulator_init(lt9611uxc);
803 if (ret < 0)
804 goto err_of_put;
805
806 lt9611uxc_assert_5v(lt9611uxc);
807
808 ret = lt9611uxc_regulator_enable(lt9611uxc);
809 if (ret)
810 goto err_of_put;
811
812 lt9611uxc_reset(lt9611uxc);
813
814 ret = lt9611uxc_read_device_rev(lt9611uxc);
815 if (ret) {
816 dev_err(dev, "failed to read chip rev\n");
817 goto err_disable_regulators;
818 }
819
820retry:
821 ret = lt9611uxc_read_version(lt9611uxc);
822 if (ret < 0) {
823 dev_err(dev, "failed to read FW version\n");
824 goto err_disable_regulators;
825 } else if (ret == 0) {
826 if (!fw_updated) {
827 fw_updated = true;
828 dev_err(dev, "FW version 0, enforcing firmware update\n");
829 ret = lt9611uxc_firmware_update(lt9611uxc);
830 if (ret < 0)
831 goto err_disable_regulators;
832 else
833 goto retry;
834 } else {
835 dev_err(dev, "FW version 0, update failed\n");
836 ret = -EOPNOTSUPP;
837 goto err_disable_regulators;
838 }
839 } else if (ret < 0x40) {
840 dev_info(dev, "FW version 0x%x, HPD not supported\n", ret);
841 } else {
842 lt9611uxc->hpd_supported = true;
843 }
844 lt9611uxc->fw_version = ret;
845
846 init_waitqueue_head(&lt9611uxc->wq);
847 INIT_WORK(&lt9611uxc->work, lt9611uxc_hpd_work);
848
849 ret = request_threaded_irq(irq: client->irq, NULL,
850 thread_fn: lt9611uxc_irq_thread_handler,
851 IRQF_ONESHOT, name: "lt9611uxc", dev: lt9611uxc);
852 if (ret) {
853 dev_err(dev, "failed to request irq\n");
854 goto err_disable_regulators;
855 }
856
857 i2c_set_clientdata(client, data: lt9611uxc);
858
859 lt9611uxc->bridge.of_node = client->dev.of_node;
860 lt9611uxc->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID;
861 if (lt9611uxc->hpd_supported)
862 lt9611uxc->bridge.ops |= DRM_BRIDGE_OP_HPD;
863 lt9611uxc->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
864
865 drm_bridge_add(bridge: &lt9611uxc->bridge);
866
867 /* Attach primary DSI */
868 lt9611uxc->dsi0 = lt9611uxc_attach_dsi(lt9611uxc, dsi_node: lt9611uxc->dsi0_node);
869 if (IS_ERR(ptr: lt9611uxc->dsi0)) {
870 ret = PTR_ERR(ptr: lt9611uxc->dsi0);
871 goto err_remove_bridge;
872 }
873
874 /* Attach secondary DSI, if specified */
875 if (lt9611uxc->dsi1_node) {
876 lt9611uxc->dsi1 = lt9611uxc_attach_dsi(lt9611uxc, dsi_node: lt9611uxc->dsi1_node);
877 if (IS_ERR(ptr: lt9611uxc->dsi1)) {
878 ret = PTR_ERR(ptr: lt9611uxc->dsi1);
879 goto err_remove_bridge;
880 }
881 }
882
883 ret = lt9611uxc_audio_init(dev, lt9611uxc);
884 if (ret)
885 goto err_remove_bridge;
886
887 return 0;
888
889err_remove_bridge:
890 free_irq(client->irq, lt9611uxc);
891 cancel_work_sync(work: &lt9611uxc->work);
892 drm_bridge_remove(bridge: &lt9611uxc->bridge);
893
894err_disable_regulators:
895 regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), consumers: lt9611uxc->supplies);
896
897err_of_put:
898 of_node_put(node: lt9611uxc->dsi1_node);
899 of_node_put(node: lt9611uxc->dsi0_node);
900
901 return ret;
902}
903
904static void lt9611uxc_remove(struct i2c_client *client)
905{
906 struct lt9611uxc *lt9611uxc = i2c_get_clientdata(client);
907
908 free_irq(client->irq, lt9611uxc);
909 cancel_work_sync(work: &lt9611uxc->work);
910 lt9611uxc_audio_exit(lt9611uxc);
911 drm_bridge_remove(bridge: &lt9611uxc->bridge);
912
913 mutex_destroy(lock: &lt9611uxc->ocm_lock);
914
915 regulator_bulk_disable(ARRAY_SIZE(lt9611uxc->supplies), consumers: lt9611uxc->supplies);
916
917 of_node_put(node: lt9611uxc->dsi1_node);
918 of_node_put(node: lt9611uxc->dsi0_node);
919}
920
921static const struct i2c_device_id lt9611uxc_id[] = {
922 { "lontium,lt9611uxc" },
923 { /* sentinel */ }
924};
925
926static const struct of_device_id lt9611uxc_match_table[] = {
927 { .compatible = "lontium,lt9611uxc" },
928 { /* sentinel */ }
929};
930MODULE_DEVICE_TABLE(of, lt9611uxc_match_table);
931
932static struct i2c_driver lt9611uxc_driver = {
933 .driver = {
934 .name = "lt9611uxc",
935 .of_match_table = lt9611uxc_match_table,
936 .dev_groups = lt9611uxc_attr_groups,
937 },
938 .probe = lt9611uxc_probe,
939 .remove = lt9611uxc_remove,
940 .id_table = lt9611uxc_id,
941};
942module_i2c_driver(lt9611uxc_driver);
943
944MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>");
945MODULE_DESCRIPTION("Lontium LT9611UXC DSI/HDMI bridge driver");
946MODULE_LICENSE("GPL v2");
947
948MODULE_FIRMWARE(FW_FILE);
949

source code of linux/drivers/gpu/drm/bridge/lontium-lt9611uxc.c