1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/device.h>
7#include <linux/delay.h>
8#include <linux/gpio/consumer.h>
9#include <linux/i2c.h>
10#include <linux/media-bus-format.h>
11#include <linux/regmap.h>
12
13#include <drm/drm_probe_helper.h>
14#include <drm/drm_atomic_helper.h>
15#include <drm/drm_edid.h>
16#include <drm/drm_mipi_dsi.h>
17#include <drm/drm_of.h>
18
19#include <video/videomode.h>
20
21#define I2C_MAIN 0
22#define I2C_ADDR_MAIN 0x48
23
24#define I2C_CEC_DSI 1
25#define I2C_ADDR_CEC_DSI 0x49
26
27#define I2C_MAX_IDX 2
28
29struct lt8912 {
30 struct device *dev;
31 struct drm_bridge bridge;
32 struct drm_connector connector;
33
34 struct i2c_client *i2c_client[I2C_MAX_IDX];
35 struct regmap *regmap[I2C_MAX_IDX];
36
37 struct device_node *host_node;
38 struct drm_bridge *hdmi_port;
39
40 struct mipi_dsi_device *dsi;
41
42 struct gpio_desc *gp_reset;
43
44 struct videomode mode;
45
46 struct regulator_bulk_data supplies[7];
47
48 u8 data_lanes;
49 bool is_power_on;
50};
51
52static int lt8912_write_init_config(struct lt8912 *lt)
53{
54 const struct reg_sequence seq[] = {
55 /* Digital clock en*/
56 {0x08, 0xff},
57 {0x09, 0xff},
58 {0x0a, 0xff},
59 {0x0b, 0x7c},
60 {0x0c, 0xff},
61 {0x42, 0x04},
62
63 /*Tx Analog*/
64 {0x31, 0xb1},
65 {0x32, 0xb1},
66 {0x33, 0x0e},
67 {0x37, 0x00},
68 {0x38, 0x22},
69 {0x60, 0x82},
70
71 /*Cbus Analog*/
72 {0x39, 0x45},
73 {0x3a, 0x00},
74 {0x3b, 0x00},
75
76 /*HDMI Pll Analog*/
77 {0x44, 0x31},
78 {0x55, 0x44},
79 {0x57, 0x01},
80 {0x5a, 0x02},
81
82 /*MIPI Analog*/
83 {0x3e, 0xd6},
84 {0x3f, 0xd4},
85 {0x41, 0x3c},
86 {0xB2, 0x00},
87 };
88
89 return regmap_multi_reg_write(map: lt->regmap[I2C_MAIN], regs: seq, ARRAY_SIZE(seq));
90}
91
92static int lt8912_write_mipi_basic_config(struct lt8912 *lt)
93{
94 const struct reg_sequence seq[] = {
95 {0x12, 0x04},
96 {0x14, 0x00},
97 {0x15, 0x00},
98 {0x1a, 0x03},
99 {0x1b, 0x03},
100 };
101
102 return regmap_multi_reg_write(map: lt->regmap[I2C_CEC_DSI], regs: seq, ARRAY_SIZE(seq));
103};
104
105static int lt8912_write_dds_config(struct lt8912 *lt)
106{
107 const struct reg_sequence seq[] = {
108 {0x4e, 0xff},
109 {0x4f, 0x56},
110 {0x50, 0x69},
111 {0x51, 0x80},
112 {0x1f, 0x5e},
113 {0x20, 0x01},
114 {0x21, 0x2c},
115 {0x22, 0x01},
116 {0x23, 0xfa},
117 {0x24, 0x00},
118 {0x25, 0xc8},
119 {0x26, 0x00},
120 {0x27, 0x5e},
121 {0x28, 0x01},
122 {0x29, 0x2c},
123 {0x2a, 0x01},
124 {0x2b, 0xfa},
125 {0x2c, 0x00},
126 {0x2d, 0xc8},
127 {0x2e, 0x00},
128 {0x42, 0x64},
129 {0x43, 0x00},
130 {0x44, 0x04},
131 {0x45, 0x00},
132 {0x46, 0x59},
133 {0x47, 0x00},
134 {0x48, 0xf2},
135 {0x49, 0x06},
136 {0x4a, 0x00},
137 {0x4b, 0x72},
138 {0x4c, 0x45},
139 {0x4d, 0x00},
140 {0x52, 0x08},
141 {0x53, 0x00},
142 {0x54, 0xb2},
143 {0x55, 0x00},
144 {0x56, 0xe4},
145 {0x57, 0x0d},
146 {0x58, 0x00},
147 {0x59, 0xe4},
148 {0x5a, 0x8a},
149 {0x5b, 0x00},
150 {0x5c, 0x34},
151 {0x1e, 0x4f},
152 {0x51, 0x00},
153 };
154
155 return regmap_multi_reg_write(map: lt->regmap[I2C_CEC_DSI], regs: seq, ARRAY_SIZE(seq));
156}
157
158static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
159{
160 int ret;
161
162 ret = regmap_write(map: lt->regmap[I2C_MAIN], reg: 0x03, val: 0x7f);
163 usleep_range(min: 10000, max: 20000);
164 ret |= regmap_write(map: lt->regmap[I2C_MAIN], reg: 0x03, val: 0xff);
165
166 return ret;
167};
168
169/* enable LVDS output with some hardcoded configuration, not required for the HDMI output */
170static int lt8912_write_lvds_config(struct lt8912 *lt)
171{
172 const struct reg_sequence seq[] = {
173 // lvds power up
174 {0x44, 0x30},
175 {0x51, 0x05},
176
177 // core pll bypass
178 {0x50, 0x24}, // cp=50uA
179 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL
180 {0x52, 0x04}, // loopdiv=0, use second-order PLL
181 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO
182 {0x69, 0x8e},
183 {0x6a, 0x00},
184 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8]
185 {0x6b, 0x51},
186
187 {0x04, 0xfb}, // core pll reset
188 {0x04, 0xff},
189
190 // scaler bypass
191 {0x7f, 0x00}, // disable scaler
192 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA
193
194 {0x02, 0xf7}, // lvds pll reset
195 {0x02, 0xff},
196 {0x03, 0xcf},
197 {0x03, 0xff},
198 };
199
200 return regmap_multi_reg_write(map: lt->regmap[I2C_MAIN], regs: seq, ARRAY_SIZE(seq));
201};
202
203static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
204{
205 return container_of(b, struct lt8912, bridge);
206}
207
208static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
209{
210 return container_of(c, struct lt8912, connector);
211}
212
213static const struct regmap_config lt8912_regmap_config = {
214 .reg_bits = 8,
215 .val_bits = 8,
216 .max_register = 0xff,
217};
218
219static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client)
220{
221 unsigned int i;
222 /*
223 * At this time we only initialize 2 chips, but the lt8912 provides
224 * a third interface for the audio over HDMI configuration.
225 */
226 struct i2c_board_info info[] = {
227 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },
228 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },
229 };
230
231 if (!lt)
232 return -ENODEV;
233
234 for (i = 0; i < ARRAY_SIZE(info); i++) {
235 if (i > 0) {
236 lt->i2c_client[i] = i2c_new_dummy_device(adapter: client->adapter,
237 address: info[i].addr);
238 if (IS_ERR(ptr: lt->i2c_client[i]))
239 return PTR_ERR(ptr: lt->i2c_client[i]);
240 }
241
242 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],
243 &lt8912_regmap_config);
244 if (IS_ERR(ptr: lt->regmap[i]))
245 return PTR_ERR(ptr: lt->regmap[i]);
246 }
247 return 0;
248}
249
250static int lt8912_free_i2c(struct lt8912 *lt)
251{
252 unsigned int i;
253
254 for (i = 1; i < I2C_MAX_IDX; i++)
255 i2c_unregister_device(client: lt->i2c_client[i]);
256
257 return 0;
258}
259
260static int lt8912_hard_power_on(struct lt8912 *lt)
261{
262 int ret;
263
264 ret = regulator_bulk_enable(ARRAY_SIZE(lt->supplies), consumers: lt->supplies);
265 if (ret)
266 return ret;
267
268 gpiod_set_value_cansleep(desc: lt->gp_reset, value: 0);
269 msleep(msecs: 20);
270
271 return 0;
272}
273
274static void lt8912_hard_power_off(struct lt8912 *lt)
275{
276 gpiod_set_value_cansleep(desc: lt->gp_reset, value: 1);
277 msleep(msecs: 20);
278
279 regulator_bulk_disable(ARRAY_SIZE(lt->supplies), consumers: lt->supplies);
280
281 lt->is_power_on = false;
282}
283
284static int lt8912_video_setup(struct lt8912 *lt)
285{
286 u32 hactive, h_total, hpw, hfp, hbp;
287 u32 vactive, v_total, vpw, vfp, vbp;
288 u8 settle = 0x08;
289 int ret, hsync_activehigh, vsync_activehigh;
290
291 if (!lt)
292 return -EINVAL;
293
294 hactive = lt->mode.hactive;
295 hfp = lt->mode.hfront_porch;
296 hpw = lt->mode.hsync_len;
297 hbp = lt->mode.hback_porch;
298 h_total = hactive + hfp + hpw + hbp;
299 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH;
300
301 vactive = lt->mode.vactive;
302 vfp = lt->mode.vfront_porch;
303 vpw = lt->mode.vsync_len;
304 vbp = lt->mode.vback_porch;
305 v_total = vactive + vfp + vpw + vbp;
306 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH;
307
308 if (vactive <= 600)
309 settle = 0x04;
310 else if (vactive == 1080)
311 settle = 0x0a;
312
313 ret = regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x10, val: 0x01);
314 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x11, val: settle);
315 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x18, val: hpw);
316 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x19, val: vpw);
317 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x1c, val: hactive & 0xff);
318 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x1d, val: hactive >> 8);
319
320 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x2f, val: 0x0c);
321
322 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x34, val: h_total & 0xff);
323 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x35, val: h_total >> 8);
324
325 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x36, val: v_total & 0xff);
326 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x37, val: v_total >> 8);
327
328 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x38, val: vbp & 0xff);
329 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x39, val: vbp >> 8);
330
331 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3a, val: vfp & 0xff);
332 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3b, val: vfp >> 8);
333
334 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3c, val: hbp & 0xff);
335 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3d, val: hbp >> 8);
336
337 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3e, val: hfp & 0xff);
338 ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3f, val: hfp >> 8);
339
340 ret |= regmap_update_bits(map: lt->regmap[I2C_MAIN], reg: 0xab, BIT(0),
341 val: vsync_activehigh ? BIT(0) : 0);
342 ret |= regmap_update_bits(map: lt->regmap[I2C_MAIN], reg: 0xab, BIT(1),
343 val: hsync_activehigh ? BIT(1) : 0);
344 ret |= regmap_update_bits(map: lt->regmap[I2C_MAIN], reg: 0xb2, BIT(0),
345 val: lt->connector.display_info.is_hdmi ? BIT(0) : 0);
346
347 return ret;
348}
349
350static int lt8912_soft_power_on(struct lt8912 *lt)
351{
352 if (!lt->is_power_on) {
353 u32 lanes = lt->data_lanes;
354
355 lt8912_write_init_config(lt);
356 regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x13, val: lanes & 3);
357
358 lt8912_write_mipi_basic_config(lt);
359
360 lt->is_power_on = true;
361 }
362
363 return 0;
364}
365
366static int lt8912_video_on(struct lt8912 *lt)
367{
368 int ret;
369
370 ret = lt8912_video_setup(lt);
371 if (ret < 0)
372 goto end;
373
374 ret = lt8912_write_dds_config(lt);
375 if (ret < 0)
376 goto end;
377
378 ret = lt8912_write_rxlogicres_config(lt);
379 if (ret < 0)
380 goto end;
381
382 ret = lt8912_write_lvds_config(lt);
383 if (ret < 0)
384 goto end;
385
386end:
387 return ret;
388}
389
390static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt)
391{
392 int ret;
393 unsigned int reg_val;
394
395 ret = regmap_read(map: lt->regmap[I2C_MAIN], reg: 0xC1, val: &reg_val);
396 if (ret)
397 return connector_status_unknown;
398
399 if (reg_val & BIT(7))
400 return connector_status_connected;
401
402 return connector_status_disconnected;
403}
404
405static enum drm_connector_status
406lt8912_connector_detect(struct drm_connector *connector, bool force)
407{
408 struct lt8912 *lt = connector_to_lt8912(c: connector);
409
410 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
411 return drm_bridge_detect(bridge: lt->hdmi_port, connector);
412
413 return lt8912_check_cable_status(lt);
414}
415
416static const struct drm_connector_funcs lt8912_connector_funcs = {
417 .detect = lt8912_connector_detect,
418 .fill_modes = drm_helper_probe_single_connector_modes,
419 .destroy = drm_connector_cleanup,
420 .reset = drm_atomic_helper_connector_reset,
421 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
422 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
423};
424
425static int lt8912_connector_get_modes(struct drm_connector *connector)
426{
427 const struct drm_edid *drm_edid;
428 struct lt8912 *lt = connector_to_lt8912(c: connector);
429 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
430 int ret, num;
431
432 drm_edid = drm_bridge_edid_read(bridge: lt->hdmi_port, connector);
433 drm_edid_connector_update(connector, edid: drm_edid);
434 if (!drm_edid)
435 return 0;
436
437 num = drm_edid_connector_add_modes(connector);
438
439 ret = drm_display_info_set_bus_formats(info: &connector->display_info,
440 formats: &bus_format, num_formats: 1);
441 if (ret < 0)
442 num = 0;
443
444 drm_edid_free(drm_edid);
445 return num;
446}
447
448static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
449 .get_modes = lt8912_connector_get_modes,
450};
451
452static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
453 const struct drm_display_mode *mode,
454 const struct drm_display_mode *adj)
455{
456 struct lt8912 *lt = bridge_to_lt8912(b: bridge);
457
458 drm_display_mode_to_videomode(dmode: adj, vm: &lt->mode);
459}
460
461static void lt8912_bridge_enable(struct drm_bridge *bridge)
462{
463 struct lt8912 *lt = bridge_to_lt8912(b: bridge);
464
465 lt8912_video_on(lt);
466}
467
468static int lt8912_attach_dsi(struct lt8912 *lt)
469{
470 struct device *dev = lt->dev;
471 struct mipi_dsi_host *host;
472 struct mipi_dsi_device *dsi;
473 int ret = -1;
474 const struct mipi_dsi_device_info info = { .type = "lt8912",
475 .channel = 0,
476 .node = NULL,
477 };
478
479 host = of_find_mipi_dsi_host_by_node(node: lt->host_node);
480 if (!host)
481 return dev_err_probe(dev, err: -EPROBE_DEFER, fmt: "failed to find dsi host\n");
482
483 dsi = devm_mipi_dsi_device_register_full(dev, host, info: &info);
484 if (IS_ERR(ptr: dsi)) {
485 ret = PTR_ERR(ptr: dsi);
486 dev_err(dev, "failed to create dsi device (%d)\n", ret);
487 return ret;
488 }
489
490 lt->dsi = dsi;
491
492 dsi->lanes = lt->data_lanes;
493 dsi->format = MIPI_DSI_FMT_RGB888;
494
495 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
496 MIPI_DSI_MODE_LPM |
497 MIPI_DSI_MODE_NO_EOT_PACKET;
498
499 ret = devm_mipi_dsi_attach(dev, dsi);
500 if (ret < 0) {
501 dev_err(dev, "failed to attach dsi to host\n");
502 return ret;
503 }
504
505 return 0;
506}
507
508static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status)
509{
510 struct lt8912 *lt = data;
511
512 if (lt->bridge.dev)
513 drm_helper_hpd_irq_event(dev: lt->bridge.dev);
514}
515
516static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
517{
518 int ret;
519 struct lt8912 *lt = bridge_to_lt8912(b: bridge);
520 struct drm_connector *connector = &lt->connector;
521
522 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) {
523 drm_bridge_hpd_enable(bridge: lt->hdmi_port, cb: lt8912_bridge_hpd_cb, data: lt);
524 connector->polled = DRM_CONNECTOR_POLL_HPD;
525 } else {
526 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
527 DRM_CONNECTOR_POLL_DISCONNECT;
528 }
529
530 ret = drm_connector_init(dev: bridge->dev, connector,
531 funcs: &lt8912_connector_funcs,
532 connector_type: lt->hdmi_port->type);
533 if (ret)
534 goto exit;
535
536 drm_connector_helper_add(connector, funcs: &lt8912_connector_helper_funcs);
537
538 connector->dpms = DRM_MODE_DPMS_OFF;
539 drm_connector_attach_encoder(connector, encoder: bridge->encoder);
540
541exit:
542 return ret;
543}
544
545static int lt8912_bridge_attach(struct drm_bridge *bridge,
546 struct drm_encoder *encoder,
547 enum drm_bridge_attach_flags flags)
548{
549 struct lt8912 *lt = bridge_to_lt8912(b: bridge);
550 int ret;
551
552 ret = drm_bridge_attach(encoder, bridge: lt->hdmi_port, previous: bridge,
553 flags: DRM_BRIDGE_ATTACH_NO_CONNECTOR);
554 if (ret < 0) {
555 dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret);
556 return ret;
557 }
558
559 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
560 ret = lt8912_bridge_connector_init(bridge);
561 if (ret) {
562 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);
563 return ret;
564 }
565 }
566
567 ret = lt8912_hard_power_on(lt);
568 if (ret)
569 return ret;
570
571 ret = lt8912_soft_power_on(lt);
572 if (ret)
573 goto error;
574
575 return 0;
576
577error:
578 lt8912_hard_power_off(lt);
579 return ret;
580}
581
582static void lt8912_bridge_detach(struct drm_bridge *bridge)
583{
584 struct lt8912 *lt = bridge_to_lt8912(b: bridge);
585
586 lt8912_hard_power_off(lt);
587
588 if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD)
589 drm_bridge_hpd_disable(bridge: lt->hdmi_port);
590}
591
592static enum drm_mode_status
593lt8912_bridge_mode_valid(struct drm_bridge *bridge,
594 const struct drm_display_info *info,
595 const struct drm_display_mode *mode)
596{
597 if (mode->clock > 150000)
598 return MODE_CLOCK_HIGH;
599
600 if (mode->hdisplay > 1920)
601 return MODE_BAD_HVALUE;
602
603 if (mode->vdisplay > 1080)
604 return MODE_BAD_VVALUE;
605
606 return MODE_OK;
607}
608
609static enum drm_connector_status
610lt8912_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connector)
611{
612 struct lt8912 *lt = bridge_to_lt8912(b: bridge);
613
614 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
615 return drm_bridge_detect(bridge: lt->hdmi_port, connector);
616
617 return lt8912_check_cable_status(lt);
618}
619
620static const struct drm_edid *lt8912_bridge_edid_read(struct drm_bridge *bridge,
621 struct drm_connector *connector)
622{
623 struct lt8912 *lt = bridge_to_lt8912(b: bridge);
624
625 /*
626 * edid must be read through the ddc bus but it must be
627 * given to the hdmi connector node.
628 */
629 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)
630 return drm_bridge_edid_read(bridge: lt->hdmi_port, connector);
631
632 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");
633 return NULL;
634}
635
636static const struct drm_bridge_funcs lt8912_bridge_funcs = {
637 .attach = lt8912_bridge_attach,
638 .detach = lt8912_bridge_detach,
639 .mode_valid = lt8912_bridge_mode_valid,
640 .mode_set = lt8912_bridge_mode_set,
641 .enable = lt8912_bridge_enable,
642 .detect = lt8912_bridge_detect,
643 .edid_read = lt8912_bridge_edid_read,
644};
645
646static int lt8912_bridge_resume(struct device *dev)
647{
648 struct lt8912 *lt = dev_get_drvdata(dev);
649 int ret;
650
651 ret = lt8912_hard_power_on(lt);
652 if (ret)
653 return ret;
654
655 ret = lt8912_soft_power_on(lt);
656 if (ret)
657 return ret;
658
659 return lt8912_video_on(lt);
660}
661
662static int lt8912_bridge_suspend(struct device *dev)
663{
664 struct lt8912 *lt = dev_get_drvdata(dev);
665
666 lt8912_hard_power_off(lt);
667
668 return 0;
669}
670
671static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, lt8912_bridge_resume);
672
673static int lt8912_get_regulators(struct lt8912 *lt)
674{
675 unsigned int i;
676 const char * const supply_names[] = {
677 "vdd", "vccmipirx", "vccsysclk", "vcclvdstx",
678 "vcchdmitx", "vcclvdspll", "vcchdmipll"
679 };
680
681 for (i = 0; i < ARRAY_SIZE(lt->supplies); i++)
682 lt->supplies[i].supply = supply_names[i];
683
684 return devm_regulator_bulk_get(dev: lt->dev, ARRAY_SIZE(lt->supplies),
685 consumers: lt->supplies);
686}
687
688static int lt8912_parse_dt(struct lt8912 *lt)
689{
690 struct gpio_desc *gp_reset;
691 struct device *dev = lt->dev;
692 int ret;
693 int data_lanes;
694 struct device_node *port_node;
695
696 gp_reset = devm_gpiod_get_optional(dev, con_id: "reset", flags: GPIOD_OUT_HIGH);
697 if (IS_ERR(ptr: gp_reset)) {
698 ret = PTR_ERR(ptr: gp_reset);
699 if (ret != -EPROBE_DEFER)
700 dev_err(dev, "Failed to get reset gpio: %d\n", ret);
701 return ret;
702 }
703 lt->gp_reset = gp_reset;
704
705 data_lanes = drm_of_get_data_lanes_count_ep(port: dev->of_node, port_reg: 0, reg: -1, min: 1, max: 4);
706 if (data_lanes < 0) {
707 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
708 return data_lanes;
709 }
710
711 lt->data_lanes = data_lanes;
712
713 lt->host_node = of_graph_get_remote_node(node: dev->of_node, port: 0, endpoint: -1);
714 if (!lt->host_node) {
715 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
716 return -ENODEV;
717 }
718
719 port_node = of_graph_get_remote_node(node: dev->of_node, port: 1, endpoint: -1);
720 if (!port_node) {
721 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);
722 ret = -ENODEV;
723 goto err_free_host_node;
724 }
725
726 lt->hdmi_port = of_drm_find_bridge(np: port_node);
727 if (!lt->hdmi_port) {
728 ret = -EPROBE_DEFER;
729 dev_err_probe(dev: lt->dev, err: ret, fmt: "%s: Failed to get hdmi port\n", __func__);
730 goto err_free_host_node;
731 }
732
733 if (!of_device_is_compatible(device: port_node, "hdmi-connector")) {
734 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
735 ret = -EINVAL;
736 goto err_free_host_node;
737 }
738
739 ret = lt8912_get_regulators(lt);
740 if (ret)
741 goto err_free_host_node;
742
743 of_node_put(node: port_node);
744 return 0;
745
746err_free_host_node:
747 of_node_put(node: port_node);
748 of_node_put(node: lt->host_node);
749 return ret;
750}
751
752static int lt8912_put_dt(struct lt8912 *lt)
753{
754 of_node_put(node: lt->host_node);
755 return 0;
756}
757
758static int lt8912_probe(struct i2c_client *client)
759{
760 static struct lt8912 *lt;
761 int ret = 0;
762 struct device *dev = &client->dev;
763
764 lt = devm_drm_bridge_alloc(dev, struct lt8912, bridge,
765 &lt8912_bridge_funcs);
766 if (IS_ERR(ptr: lt))
767 return PTR_ERR(ptr: lt);
768
769 lt->dev = dev;
770 lt->i2c_client[0] = client;
771
772 ret = lt8912_parse_dt(lt);
773 if (ret)
774 goto err_dt_parse;
775
776 ret = lt8912_init_i2c(lt, client);
777 if (ret)
778 goto err_i2c;
779
780 i2c_set_clientdata(client, data: lt);
781
782 lt->bridge.of_node = dev->of_node;
783 lt->bridge.ops = (DRM_BRIDGE_OP_EDID |
784 DRM_BRIDGE_OP_DETECT);
785
786 drm_bridge_add(bridge: &lt->bridge);
787
788 ret = lt8912_attach_dsi(lt);
789 if (ret)
790 goto err_attach;
791
792 return 0;
793
794err_attach:
795 drm_bridge_remove(bridge: &lt->bridge);
796 lt8912_free_i2c(lt);
797err_i2c:
798 lt8912_put_dt(lt);
799err_dt_parse:
800 return ret;
801}
802
803static void lt8912_remove(struct i2c_client *client)
804{
805 struct lt8912 *lt = i2c_get_clientdata(client);
806
807 drm_bridge_remove(bridge: &lt->bridge);
808 lt8912_free_i2c(lt);
809 lt8912_put_dt(lt);
810}
811
812static const struct of_device_id lt8912_dt_match[] = {
813 {.compatible = "lontium,lt8912b"},
814 {}
815};
816MODULE_DEVICE_TABLE(of, lt8912_dt_match);
817
818static const struct i2c_device_id lt8912_id[] = {
819 { "lt8912" },
820 {}
821};
822MODULE_DEVICE_TABLE(i2c, lt8912_id);
823
824static struct i2c_driver lt8912_i2c_driver = {
825 .driver = {
826 .name = "lt8912",
827 .of_match_table = lt8912_dt_match,
828 .pm = pm_sleep_ptr(&lt8912_bridge_pm_ops),
829 },
830 .probe = lt8912_probe,
831 .remove = lt8912_remove,
832 .id_table = lt8912_id,
833};
834module_i2c_driver(lt8912_i2c_driver);
835
836MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
837MODULE_DESCRIPTION("lt8912 drm driver");
838MODULE_LICENSE("GPL v2");
839

source code of linux/drivers/gpu/drm/bridge/lontium-lt8912b.c