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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(lt->regmap[I2C_MAIN], 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(lt->regmap[I2C_CEC_DSI], 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(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
156}
157
158static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
159{
160 int ret;
161
162 ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);
163 usleep_range(10000, 20000);
164 ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 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(lt->regmap[I2C_MAIN], 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(client->adapter,
237 info[i].addr);
238 if (IS_ERR(lt->i2c_client[i]))
239 return PTR_ERR(lt->i2c_client[i]);
240 }
241
242 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],
243 <8912_regmap_config);
244 if (IS_ERR(lt->regmap[i]))
245 return PTR_ERR(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(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), lt->supplies);
265 if (ret)
266 return ret;
267
268 gpiod_set_value_cansleep(lt->gp_reset, 0);
269 msleep(20);
270
271 return 0;
272}
273
274static void lt8912_hard_power_off(struct lt8912 *lt)
275{
276 gpiod_set_value_cansleep(lt->gp_reset, 1);
277 msleep(20);
278
279 regulator_bulk_disable(ARRAY_SIZE(lt->supplies), 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(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);
314 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);
315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);
316 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);
317 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff);
318 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8);
319
320 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);
321
322 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff);
323 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8);
324
325 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff);
326 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8);
327
328 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff);
329 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8);
330
331 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff);
332 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8);
333
334 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff);
335 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8);
336
337 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);
338 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);
339
340 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0),
341 vsync_activehigh ? BIT(0) : 0);
342 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1),
343 hsync_activehigh ? BIT(1) : 0);
344 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0),
345 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(lt->regmap[I2C_CEC_DSI], 0x13, 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(lt->regmap[I2C_MAIN], 0xC1, ®_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(connector);
409
410 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
411 return drm_bridge_detect(lt->hdmi_port);
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 enum drm_mode_status
426lt8912_connector_mode_valid(struct drm_connector *connector,
427 struct drm_display_mode *mode)
428{
429 if (mode->clock > 150000)
430 return MODE_CLOCK_HIGH;
431
432 if (mode->hdisplay > 1920)
433 return MODE_BAD_HVALUE;
434
435 if (mode->vdisplay > 1080)
436 return MODE_BAD_VVALUE;
437
438 return MODE_OK;
439}
440
441static int lt8912_connector_get_modes(struct drm_connector *connector)
442{
443 struct edid *edid;
444 int ret = -1;
445 int num = 0;
446 struct lt8912 *lt = connector_to_lt8912(connector);
447 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
448
449 edid = drm_bridge_get_edid(lt->hdmi_port, connector);
450 if (edid) {
451 drm_connector_update_edid_property(connector, edid);
452 num = drm_add_edid_modes(connector, edid);
453 } else {
454 return ret;
455 }
456
457 ret = drm_display_info_set_bus_formats(&connector->display_info,
458 &bus_format, 1);
459 if (ret)
460 num = ret;
461
462 kfree(edid);
463 return num;
464}
465
466static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
467 .get_modes = lt8912_connector_get_modes,
468 .mode_valid = lt8912_connector_mode_valid,
469};
470
471static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
472 const struct drm_display_mode *mode,
473 const struct drm_display_mode *adj)
474{
475 struct lt8912 *lt = bridge_to_lt8912(bridge);
476
477 drm_display_mode_to_videomode(adj, <->mode);
478}
479
480static void lt8912_bridge_enable(struct drm_bridge *bridge)
481{
482 struct lt8912 *lt = bridge_to_lt8912(bridge);
483
484 lt8912_video_on(lt);
485}
486
487static int lt8912_attach_dsi(struct lt8912 *lt)
488{
489 struct device *dev = lt->dev;
490 struct mipi_dsi_host *host;
491 struct mipi_dsi_device *dsi;
492 int ret = -1;
493 const struct mipi_dsi_device_info info = { .type = "lt8912",
494 .channel = 0,
495 .node = NULL,
496 };
497
498 host = of_find_mipi_dsi_host_by_node(lt->host_node);
499 if (!host) {
500 dev_err(dev, "failed to find dsi host\n");
501 return -EPROBE_DEFER;
502 }
503
504 dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
505 if (IS_ERR(dsi)) {
506 ret = PTR_ERR(dsi);
507 dev_err(dev, "failed to create dsi device (%d)\n", ret);
508 return ret;
509 }
510
511 lt->dsi = dsi;
512
513 dsi->lanes = lt->data_lanes;
514 dsi->format = MIPI_DSI_FMT_RGB888;
515
516 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
517 MIPI_DSI_MODE_LPM |
518 MIPI_DSI_MODE_NO_EOT_PACKET;
519
520 ret = devm_mipi_dsi_attach(dev, dsi);
521 if (ret < 0) {
522 dev_err(dev, "failed to attach dsi to host\n");
523 return ret;
524 }
525
526 return 0;
527}
528
529static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status)
530{
531 struct lt8912 *lt = data;
532
533 if (lt->bridge.dev)
534 drm_helper_hpd_irq_event(lt->bridge.dev);
535}
536
537static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
538{
539 int ret;
540 struct lt8912 *lt = bridge_to_lt8912(bridge);
541 struct drm_connector *connector = <->connector;
542
543 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) {
544 drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt);
545 connector->polled = DRM_CONNECTOR_POLL_HPD;
546 } else {
547 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
548 DRM_CONNECTOR_POLL_DISCONNECT;
549 }
550
551 ret = drm_connector_init(bridge->dev, connector,
552 <8912_connector_funcs,
553 lt->hdmi_port->type);
554 if (ret)
555 goto exit;
556
557 drm_connector_helper_add(connector, <8912_connector_helper_funcs);
558
559 connector->dpms = DRM_MODE_DPMS_OFF;
560 drm_connector_attach_encoder(connector, bridge->encoder);
561
562exit:
563 return ret;
564}
565
566static int lt8912_bridge_attach(struct drm_bridge *bridge,
567 enum drm_bridge_attach_flags flags)
568{
569 struct lt8912 *lt = bridge_to_lt8912(bridge);
570 int ret;
571
572 ret = drm_bridge_attach(bridge->encoder, lt->hdmi_port, bridge,
573 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
574 if (ret < 0) {
575 dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret);
576 return ret;
577 }
578
579 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
580 ret = lt8912_bridge_connector_init(bridge);
581 if (ret) {
582 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);
583 return ret;
584 }
585 }
586
587 ret = lt8912_hard_power_on(lt);
588 if (ret)
589 return ret;
590
591 ret = lt8912_soft_power_on(lt);
592 if (ret)
593 goto error;
594
595 return 0;
596
597error:
598 lt8912_hard_power_off(lt);
599 return ret;
600}
601
602static void lt8912_bridge_detach(struct drm_bridge *bridge)
603{
604 struct lt8912 *lt = bridge_to_lt8912(bridge);
605
606 lt8912_hard_power_off(lt);
607
608 if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD)
609 drm_bridge_hpd_disable(lt->hdmi_port);
610}
611
612static enum drm_connector_status
613lt8912_bridge_detect(struct drm_bridge *bridge)
614{
615 struct lt8912 *lt = bridge_to_lt8912(bridge);
616
617 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
618 return drm_bridge_detect(lt->hdmi_port);
619
620 return lt8912_check_cable_status(lt);
621}
622
623static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge,
624 struct drm_connector *connector)
625{
626 struct lt8912 *lt = bridge_to_lt8912(bridge);
627
628 /*
629 * edid must be read through the ddc bus but it must be
630 * given to the hdmi connector node.
631 */
632 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)
633 return drm_bridge_get_edid(lt->hdmi_port, connector);
634
635 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");
636 return NULL;
637}
638
639static const struct drm_bridge_funcs lt8912_bridge_funcs = {
640 .attach = lt8912_bridge_attach,
641 .detach = lt8912_bridge_detach,
642 .mode_set = lt8912_bridge_mode_set,
643 .enable = lt8912_bridge_enable,
644 .detect = lt8912_bridge_detect,
645 .get_edid = lt8912_bridge_get_edid,
646};
647
648static int lt8912_bridge_resume(struct device *dev)
649{
650 struct lt8912 *lt = dev_get_drvdata(dev);
651 int ret;
652
653 ret = lt8912_hard_power_on(lt);
654 if (ret)
655 return ret;
656
657 ret = lt8912_soft_power_on(lt);
658 if (ret)
659 return ret;
660
661 return lt8912_video_on(lt);
662}
663
664static int lt8912_bridge_suspend(struct device *dev)
665{
666 struct lt8912 *lt = dev_get_drvdata(dev);
667
668 lt8912_hard_power_off(lt);
669
670 return 0;
671}
672
673static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, lt8912_bridge_resume);
674
675static int lt8912_get_regulators(struct lt8912 *lt)
676{
677 unsigned int i;
678 const char * const supply_names[] = {
679 "vdd", "vccmipirx", "vccsysclk", "vcclvdstx",
680 "vcchdmitx", "vcclvdspll", "vcchdmipll"
681 };
682
683 for (i = 0; i < ARRAY_SIZE(lt->supplies); i++)
684 lt->supplies[i].supply = supply_names[i];
685
686 return devm_regulator_bulk_get(lt->dev, ARRAY_SIZE(lt->supplies),
687 lt->supplies);
688}
689
690static int lt8912_parse_dt(struct lt8912 *lt)
691{
692 struct gpio_desc *gp_reset;
693 struct device *dev = lt->dev;
694 int ret;
695 int data_lanes;
696 struct device_node *port_node;
697
698 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
699 if (IS_ERR(gp_reset)) {
700 ret = PTR_ERR(gp_reset);
701 if (ret != -EPROBE_DEFER)
702 dev_err(dev, "Failed to get reset gpio: %d\n", ret);
703 return ret;
704 }
705 lt->gp_reset = gp_reset;
706
707 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4);
708 if (data_lanes < 0) {
709 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
710 return data_lanes;
711 }
712
713 lt->data_lanes = data_lanes;
714
715 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
716 if (!lt->host_node) {
717 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
718 return -ENODEV;
719 }
720
721 port_node = of_graph_get_remote_node(dev->of_node, 1, -1);
722 if (!port_node) {
723 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);
724 ret = -ENODEV;
725 goto err_free_host_node;
726 }
727
728 lt->hdmi_port = of_drm_find_bridge(port_node);
729 if (!lt->hdmi_port) {
730 ret = -EPROBE_DEFER;
731 dev_err_probe(lt->dev, ret, "%s: Failed to get hdmi port\n", __func__);
732 goto err_free_host_node;
733 }
734
735 if (!of_device_is_compatible(port_node, "hdmi-connector")) {
736 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
737 ret = -EINVAL;
738 goto err_free_host_node;
739 }
740
741 ret = lt8912_get_regulators(lt);
742 if (ret)
743 goto err_free_host_node;
744
745 of_node_put(port_node);
746 return 0;
747
748err_free_host_node:
749 of_node_put(port_node);
750 of_node_put(lt->host_node);
751 return ret;
752}
753
754static int lt8912_put_dt(struct lt8912 *lt)
755{
756 of_node_put(lt->host_node);
757 return 0;
758}
759
760static int lt8912_probe(struct i2c_client *client)
761{
762 static struct lt8912 *lt;
763 int ret = 0;
764 struct device *dev = &client->dev;
765
766 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);
767 if (!lt)
768 return -ENOMEM;
769
770 lt->dev = dev;
771 lt->i2c_client[0] = client;
772
773 ret = lt8912_parse_dt(lt);
774 if (ret)
775 goto err_dt_parse;
776
777 ret = lt8912_init_i2c(lt, client);
778 if (ret)
779 goto err_i2c;
780
781 i2c_set_clientdata(client, lt);
782
783 lt->bridge.funcs = <8912_bridge_funcs;
784 lt->bridge.of_node = dev->of_node;
785 lt->bridge.ops = (DRM_BRIDGE_OP_EDID |
786 DRM_BRIDGE_OP_DETECT);
787
788 drm_bridge_add(<->bridge);
789
790 ret = lt8912_attach_dsi(lt);
791 if (ret)
792 goto err_attach;
793
794 return 0;
795
796err_attach:
797 drm_bridge_remove(<->bridge);
798 lt8912_free_i2c(lt);
799err_i2c:
800 lt8912_put_dt(lt);
801err_dt_parse:
802 return ret;
803}
804
805static void lt8912_remove(struct i2c_client *client)
806{
807 struct lt8912 *lt = i2c_get_clientdata(client);
808
809 drm_bridge_remove(<->bridge);
810 lt8912_free_i2c(lt);
811 lt8912_put_dt(lt);
812}
813
814static const struct of_device_id lt8912_dt_match[] = {
815 {.compatible = "lontium,lt8912b"},
816 {}
817};
818MODULE_DEVICE_TABLE(of, lt8912_dt_match);
819
820static const struct i2c_device_id lt8912_id[] = {
821 {"lt8912", 0},
822 {},
823};
824MODULE_DEVICE_TABLE(i2c, lt8912_id);
825
826static struct i2c_driver lt8912_i2c_driver = {
827 .driver = {
828 .name = "lt8912",
829 .of_match_table = lt8912_dt_match,
830 .pm = pm_sleep_ptr(<8912_bridge_pm_ops),
831 },
832 .probe = lt8912_probe,
833 .remove = lt8912_remove,
834 .id_table = lt8912_id,
835};
836module_i2c_driver(lt8912_i2c_driver);
837
838MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
839MODULE_DESCRIPTION("lt8912 drm driver");
840MODULE_LICENSE("GPL v2");