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
29 struct 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 u8 data_lanes;
47 bool is_power_on;
48 bool is_attached;
49 };
50
lt8912_write_init_config(struct lt8912 * lt)51 static int lt8912_write_init_config(struct lt8912 *lt)
52 {
53 const struct reg_sequence seq[] = {
54 /* Digital clock en*/
55 {0x08, 0xff},
56 {0x09, 0xff},
57 {0x0a, 0xff},
58 {0x0b, 0x7c},
59 {0x0c, 0xff},
60 {0x42, 0x04},
61
62 /*Tx Analog*/
63 {0x31, 0xb1},
64 {0x32, 0xb1},
65 {0x33, 0x0e},
66 {0x37, 0x00},
67 {0x38, 0x22},
68 {0x60, 0x82},
69
70 /*Cbus Analog*/
71 {0x39, 0x45},
72 {0x3a, 0x00},
73 {0x3b, 0x00},
74
75 /*HDMI Pll Analog*/
76 {0x44, 0x31},
77 {0x55, 0x44},
78 {0x57, 0x01},
79 {0x5a, 0x02},
80
81 /*MIPI Analog*/
82 {0x3e, 0xd6},
83 {0x3f, 0xd4},
84 {0x41, 0x3c},
85 {0xB2, 0x00},
86 };
87
88 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
89 }
90
lt8912_write_mipi_basic_config(struct lt8912 * lt)91 static int lt8912_write_mipi_basic_config(struct lt8912 *lt)
92 {
93 const struct reg_sequence seq[] = {
94 {0x12, 0x04},
95 {0x14, 0x00},
96 {0x15, 0x00},
97 {0x1a, 0x03},
98 {0x1b, 0x03},
99 };
100
101 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
102 };
103
lt8912_write_dds_config(struct lt8912 * lt)104 static int lt8912_write_dds_config(struct lt8912 *lt)
105 {
106 const struct reg_sequence seq[] = {
107 {0x4e, 0xff},
108 {0x4f, 0x56},
109 {0x50, 0x69},
110 {0x51, 0x80},
111 {0x1f, 0x5e},
112 {0x20, 0x01},
113 {0x21, 0x2c},
114 {0x22, 0x01},
115 {0x23, 0xfa},
116 {0x24, 0x00},
117 {0x25, 0xc8},
118 {0x26, 0x00},
119 {0x27, 0x5e},
120 {0x28, 0x01},
121 {0x29, 0x2c},
122 {0x2a, 0x01},
123 {0x2b, 0xfa},
124 {0x2c, 0x00},
125 {0x2d, 0xc8},
126 {0x2e, 0x00},
127 {0x42, 0x64},
128 {0x43, 0x00},
129 {0x44, 0x04},
130 {0x45, 0x00},
131 {0x46, 0x59},
132 {0x47, 0x00},
133 {0x48, 0xf2},
134 {0x49, 0x06},
135 {0x4a, 0x00},
136 {0x4b, 0x72},
137 {0x4c, 0x45},
138 {0x4d, 0x00},
139 {0x52, 0x08},
140 {0x53, 0x00},
141 {0x54, 0xb2},
142 {0x55, 0x00},
143 {0x56, 0xe4},
144 {0x57, 0x0d},
145 {0x58, 0x00},
146 {0x59, 0xe4},
147 {0x5a, 0x8a},
148 {0x5b, 0x00},
149 {0x5c, 0x34},
150 {0x1e, 0x4f},
151 {0x51, 0x00},
152 };
153
154 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
155 }
156
lt8912_write_rxlogicres_config(struct lt8912 * lt)157 static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
158 {
159 int ret;
160
161 ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);
162 usleep_range(10000, 20000);
163 ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff);
164
165 return ret;
166 };
167
168 /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */
lt8912_write_lvds_config(struct lt8912 * lt)169 static int lt8912_write_lvds_config(struct lt8912 *lt)
170 {
171 const struct reg_sequence seq[] = {
172 // lvds power up
173 {0x44, 0x30},
174 {0x51, 0x05},
175
176 // core pll bypass
177 {0x50, 0x24}, // cp=50uA
178 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL
179 {0x52, 0x04}, // loopdiv=0, use second-order PLL
180 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO
181 {0x69, 0x8e},
182 {0x6a, 0x00},
183 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8]
184 {0x6b, 0x51},
185
186 {0x04, 0xfb}, // core pll reset
187 {0x04, 0xff},
188
189 // scaler bypass
190 {0x7f, 0x00}, // disable scaler
191 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA
192
193 {0x02, 0xf7}, // lvds pll reset
194 {0x02, 0xff},
195 {0x03, 0xcf},
196 {0x03, 0xff},
197 };
198
199 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
200 };
201
bridge_to_lt8912(struct drm_bridge * b)202 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
203 {
204 return container_of(b, struct lt8912, bridge);
205 }
206
connector_to_lt8912(struct drm_connector * c)207 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
208 {
209 return container_of(c, struct lt8912, connector);
210 }
211
212 static const struct regmap_config lt8912_regmap_config = {
213 .reg_bits = 8,
214 .val_bits = 8,
215 .max_register = 0xff,
216 };
217
lt8912_init_i2c(struct lt8912 * lt,struct i2c_client * client)218 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client)
219 {
220 unsigned int i;
221 /*
222 * At this time we only initialize 2 chips, but the lt8912 provides
223 * a third interface for the audio over HDMI configuration.
224 */
225 struct i2c_board_info info[] = {
226 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },
227 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },
228 };
229
230 if (!lt)
231 return -ENODEV;
232
233 for (i = 0; i < ARRAY_SIZE(info); i++) {
234 if (i > 0) {
235 lt->i2c_client[i] = i2c_new_dummy_device(client->adapter,
236 info[i].addr);
237 if (IS_ERR(lt->i2c_client[i]))
238 return PTR_ERR(lt->i2c_client[i]);
239 }
240
241 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],
242 <8912_regmap_config);
243 if (IS_ERR(lt->regmap[i]))
244 return PTR_ERR(lt->regmap[i]);
245 }
246 return 0;
247 }
248
lt8912_free_i2c(struct lt8912 * lt)249 static int lt8912_free_i2c(struct lt8912 *lt)
250 {
251 unsigned int i;
252
253 for (i = 1; i < I2C_MAX_IDX; i++)
254 i2c_unregister_device(lt->i2c_client[i]);
255
256 return 0;
257 }
258
lt8912_hard_power_on(struct lt8912 * lt)259 static int lt8912_hard_power_on(struct lt8912 *lt)
260 {
261 gpiod_set_value_cansleep(lt->gp_reset, 0);
262 msleep(20);
263
264 return 0;
265 }
266
lt8912_hard_power_off(struct lt8912 * lt)267 static void lt8912_hard_power_off(struct lt8912 *lt)
268 {
269 gpiod_set_value_cansleep(lt->gp_reset, 1);
270 msleep(20);
271 lt->is_power_on = false;
272 }
273
lt8912_video_setup(struct lt8912 * lt)274 static int lt8912_video_setup(struct lt8912 *lt)
275 {
276 u32 hactive, h_total, hpw, hfp, hbp;
277 u32 vactive, v_total, vpw, vfp, vbp;
278 u8 settle = 0x08;
279 int ret, hsync_activehigh, vsync_activehigh;
280
281 if (!lt)
282 return -EINVAL;
283
284 hactive = lt->mode.hactive;
285 hfp = lt->mode.hfront_porch;
286 hpw = lt->mode.hsync_len;
287 hbp = lt->mode.hback_porch;
288 h_total = hactive + hfp + hpw + hbp;
289 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH;
290
291 vactive = lt->mode.vactive;
292 vfp = lt->mode.vfront_porch;
293 vpw = lt->mode.vsync_len;
294 vbp = lt->mode.vback_porch;
295 v_total = vactive + vfp + vpw + vbp;
296 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH;
297
298 if (vactive <= 600)
299 settle = 0x04;
300 else if (vactive == 1080)
301 settle = 0x0a;
302
303 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);
304 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);
305 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);
306 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);
307 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff);
308 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8);
309
310 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);
311
312 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff);
313 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8);
314
315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff);
316 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8);
317
318 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff);
319 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8);
320
321 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff);
322 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8);
323
324 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff);
325 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8);
326
327 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);
328 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);
329
330 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0),
331 vsync_activehigh ? BIT(0) : 0);
332 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1),
333 hsync_activehigh ? BIT(1) : 0);
334 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0),
335 lt->connector.display_info.is_hdmi ? BIT(0) : 0);
336
337 return ret;
338 }
339
lt8912_soft_power_on(struct lt8912 * lt)340 static int lt8912_soft_power_on(struct lt8912 *lt)
341 {
342 if (!lt->is_power_on) {
343 u32 lanes = lt->data_lanes;
344
345 lt8912_write_init_config(lt);
346 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3);
347
348 lt8912_write_mipi_basic_config(lt);
349
350 lt->is_power_on = true;
351 }
352
353 return 0;
354 }
355
lt8912_video_on(struct lt8912 * lt)356 static int lt8912_video_on(struct lt8912 *lt)
357 {
358 int ret;
359
360 ret = lt8912_video_setup(lt);
361 if (ret < 0)
362 goto end;
363
364 ret = lt8912_write_dds_config(lt);
365 if (ret < 0)
366 goto end;
367
368 ret = lt8912_write_rxlogicres_config(lt);
369 if (ret < 0)
370 goto end;
371
372 ret = lt8912_write_lvds_config(lt);
373 if (ret < 0)
374 goto end;
375
376 end:
377 return ret;
378 }
379
lt8912_check_cable_status(struct lt8912 * lt)380 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt)
381 {
382 int ret;
383 unsigned int reg_val;
384
385 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val);
386 if (ret)
387 return connector_status_unknown;
388
389 if (reg_val & BIT(7))
390 return connector_status_connected;
391
392 return connector_status_disconnected;
393 }
394
395 static enum drm_connector_status
lt8912_connector_detect(struct drm_connector * connector,bool force)396 lt8912_connector_detect(struct drm_connector *connector, bool force)
397 {
398 struct lt8912 *lt = connector_to_lt8912(connector);
399
400 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
401 return drm_bridge_detect(lt->hdmi_port);
402
403 return lt8912_check_cable_status(lt);
404 }
405
406 static const struct drm_connector_funcs lt8912_connector_funcs = {
407 .detect = lt8912_connector_detect,
408 .fill_modes = drm_helper_probe_single_connector_modes,
409 .destroy = drm_connector_cleanup,
410 .reset = drm_atomic_helper_connector_reset,
411 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
412 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
413 };
414
415 static enum drm_mode_status
lt8912_connector_mode_valid(struct drm_connector * connector,struct drm_display_mode * mode)416 lt8912_connector_mode_valid(struct drm_connector *connector,
417 struct drm_display_mode *mode)
418 {
419 if (mode->clock > 150000)
420 return MODE_CLOCK_HIGH;
421
422 if (mode->hdisplay > 1920)
423 return MODE_BAD_HVALUE;
424
425 if (mode->vdisplay > 1080)
426 return MODE_BAD_VVALUE;
427
428 return MODE_OK;
429 }
430
lt8912_connector_get_modes(struct drm_connector * connector)431 static int lt8912_connector_get_modes(struct drm_connector *connector)
432 {
433 struct edid *edid;
434 int ret = -1;
435 int num = 0;
436 struct lt8912 *lt = connector_to_lt8912(connector);
437 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
438
439 edid = drm_bridge_get_edid(lt->hdmi_port, connector);
440 if (edid) {
441 drm_connector_update_edid_property(connector, edid);
442 num = drm_add_edid_modes(connector, edid);
443 } else {
444 return ret;
445 }
446
447 ret = drm_display_info_set_bus_formats(&connector->display_info,
448 &bus_format, 1);
449 if (ret)
450 num = ret;
451
452 kfree(edid);
453 return num;
454 }
455
456 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
457 .get_modes = lt8912_connector_get_modes,
458 .mode_valid = lt8912_connector_mode_valid,
459 };
460
lt8912_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adj)461 static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
462 const struct drm_display_mode *mode,
463 const struct drm_display_mode *adj)
464 {
465 struct lt8912 *lt = bridge_to_lt8912(bridge);
466
467 drm_display_mode_to_videomode(adj, <->mode);
468 }
469
lt8912_bridge_enable(struct drm_bridge * bridge)470 static void lt8912_bridge_enable(struct drm_bridge *bridge)
471 {
472 struct lt8912 *lt = bridge_to_lt8912(bridge);
473
474 lt8912_video_on(lt);
475 }
476
lt8912_attach_dsi(struct lt8912 * lt)477 static int lt8912_attach_dsi(struct lt8912 *lt)
478 {
479 struct device *dev = lt->dev;
480 struct mipi_dsi_host *host;
481 struct mipi_dsi_device *dsi;
482 int ret = -1;
483 const struct mipi_dsi_device_info info = { .type = "lt8912",
484 .channel = 0,
485 .node = NULL,
486 };
487
488 host = of_find_mipi_dsi_host_by_node(lt->host_node);
489 if (!host) {
490 dev_err(dev, "failed to find dsi host\n");
491 return -EPROBE_DEFER;
492 }
493
494 dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
495 if (IS_ERR(dsi)) {
496 ret = PTR_ERR(dsi);
497 dev_err(dev, "failed to create dsi device (%d)\n", ret);
498 return ret;
499 }
500
501 lt->dsi = dsi;
502
503 dsi->lanes = lt->data_lanes;
504 dsi->format = MIPI_DSI_FMT_RGB888;
505
506 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
507 MIPI_DSI_MODE_VIDEO_BURST |
508 MIPI_DSI_MODE_LPM |
509 MIPI_DSI_MODE_NO_EOT_PACKET;
510
511 ret = devm_mipi_dsi_attach(dev, dsi);
512 if (ret < 0) {
513 dev_err(dev, "failed to attach dsi to host\n");
514 return ret;
515 }
516
517 return 0;
518 }
519
lt8912_bridge_connector_init(struct drm_bridge * bridge)520 static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
521 {
522 int ret;
523 struct lt8912 *lt = bridge_to_lt8912(bridge);
524 struct drm_connector *connector = <->connector;
525
526 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
527 DRM_CONNECTOR_POLL_DISCONNECT;
528
529 ret = drm_connector_init(bridge->dev, connector,
530 <8912_connector_funcs,
531 lt->hdmi_port->type);
532 if (ret)
533 goto exit;
534
535 drm_connector_helper_add(connector, <8912_connector_helper_funcs);
536
537 connector->dpms = DRM_MODE_DPMS_OFF;
538 drm_connector_attach_encoder(connector, bridge->encoder);
539
540 exit:
541 return ret;
542 }
543
lt8912_bridge_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)544 static int lt8912_bridge_attach(struct drm_bridge *bridge,
545 enum drm_bridge_attach_flags flags)
546 {
547 struct lt8912 *lt = bridge_to_lt8912(bridge);
548 int ret;
549
550 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
551 ret = lt8912_bridge_connector_init(bridge);
552 if (ret) {
553 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);
554 return ret;
555 }
556 }
557
558 ret = lt8912_hard_power_on(lt);
559 if (ret)
560 return ret;
561
562 ret = lt8912_soft_power_on(lt);
563 if (ret)
564 goto error;
565
566 lt->is_attached = true;
567
568 return 0;
569
570 error:
571 lt8912_hard_power_off(lt);
572 return ret;
573 }
574
lt8912_bridge_detach(struct drm_bridge * bridge)575 static void lt8912_bridge_detach(struct drm_bridge *bridge)
576 {
577 struct lt8912 *lt = bridge_to_lt8912(bridge);
578
579 if (lt->is_attached) {
580 lt8912_hard_power_off(lt);
581 drm_connector_unregister(<->connector);
582 drm_connector_cleanup(<->connector);
583 }
584 }
585
586 static enum drm_connector_status
lt8912_bridge_detect(struct drm_bridge * bridge)587 lt8912_bridge_detect(struct drm_bridge *bridge)
588 {
589 struct lt8912 *lt = bridge_to_lt8912(bridge);
590
591 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
592 return drm_bridge_detect(lt->hdmi_port);
593
594 return lt8912_check_cable_status(lt);
595 }
596
lt8912_bridge_get_edid(struct drm_bridge * bridge,struct drm_connector * connector)597 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge,
598 struct drm_connector *connector)
599 {
600 struct lt8912 *lt = bridge_to_lt8912(bridge);
601
602 /*
603 * edid must be read through the ddc bus but it must be
604 * given to the hdmi connector node.
605 */
606 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)
607 return drm_bridge_get_edid(lt->hdmi_port, connector);
608
609 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");
610 return NULL;
611 }
612
613 static const struct drm_bridge_funcs lt8912_bridge_funcs = {
614 .attach = lt8912_bridge_attach,
615 .detach = lt8912_bridge_detach,
616 .mode_set = lt8912_bridge_mode_set,
617 .enable = lt8912_bridge_enable,
618 .detect = lt8912_bridge_detect,
619 .get_edid = lt8912_bridge_get_edid,
620 };
621
lt8912_parse_dt(struct lt8912 * lt)622 static int lt8912_parse_dt(struct lt8912 *lt)
623 {
624 struct gpio_desc *gp_reset;
625 struct device *dev = lt->dev;
626 int ret;
627 int data_lanes;
628 struct device_node *port_node;
629
630 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
631 if (IS_ERR(gp_reset)) {
632 ret = PTR_ERR(gp_reset);
633 if (ret != -EPROBE_DEFER)
634 dev_err(dev, "Failed to get reset gpio: %d\n", ret);
635 return ret;
636 }
637 lt->gp_reset = gp_reset;
638
639 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4);
640 if (data_lanes < 0) {
641 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
642 return data_lanes;
643 }
644
645 lt->data_lanes = data_lanes;
646
647 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
648 if (!lt->host_node) {
649 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
650 return -ENODEV;
651 }
652
653 port_node = of_graph_get_remote_node(dev->of_node, 1, -1);
654 if (!port_node) {
655 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);
656 ret = -ENODEV;
657 goto err_free_host_node;
658 }
659
660 lt->hdmi_port = of_drm_find_bridge(port_node);
661 if (!lt->hdmi_port) {
662 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
663 ret = -ENODEV;
664 goto err_free_host_node;
665 }
666
667 if (!of_device_is_compatible(port_node, "hdmi-connector")) {
668 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
669 ret = -EINVAL;
670 goto err_free_host_node;
671 }
672
673 of_node_put(port_node);
674 return 0;
675
676 err_free_host_node:
677 of_node_put(port_node);
678 of_node_put(lt->host_node);
679 return ret;
680 }
681
lt8912_put_dt(struct lt8912 * lt)682 static int lt8912_put_dt(struct lt8912 *lt)
683 {
684 of_node_put(lt->host_node);
685 return 0;
686 }
687
lt8912_probe(struct i2c_client * client,const struct i2c_device_id * id)688 static int lt8912_probe(struct i2c_client *client,
689 const struct i2c_device_id *id)
690 {
691 static struct lt8912 *lt;
692 int ret = 0;
693 struct device *dev = &client->dev;
694
695 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);
696 if (!lt)
697 return -ENOMEM;
698
699 lt->dev = dev;
700 lt->i2c_client[0] = client;
701
702 ret = lt8912_parse_dt(lt);
703 if (ret)
704 goto err_dt_parse;
705
706 ret = lt8912_init_i2c(lt, client);
707 if (ret)
708 goto err_i2c;
709
710 i2c_set_clientdata(client, lt);
711
712 lt->bridge.funcs = <8912_bridge_funcs;
713 lt->bridge.of_node = dev->of_node;
714 lt->bridge.ops = (DRM_BRIDGE_OP_EDID |
715 DRM_BRIDGE_OP_DETECT);
716
717 drm_bridge_add(<->bridge);
718
719 ret = lt8912_attach_dsi(lt);
720 if (ret)
721 goto err_attach;
722
723 return 0;
724
725 err_attach:
726 drm_bridge_remove(<->bridge);
727 lt8912_free_i2c(lt);
728 err_i2c:
729 lt8912_put_dt(lt);
730 err_dt_parse:
731 return ret;
732 }
733
lt8912_remove(struct i2c_client * client)734 static void lt8912_remove(struct i2c_client *client)
735 {
736 struct lt8912 *lt = i2c_get_clientdata(client);
737
738 lt8912_bridge_detach(<->bridge);
739 drm_bridge_remove(<->bridge);
740 lt8912_free_i2c(lt);
741 lt8912_put_dt(lt);
742 }
743
744 static const struct of_device_id lt8912_dt_match[] = {
745 {.compatible = "lontium,lt8912b"},
746 {}
747 };
748 MODULE_DEVICE_TABLE(of, lt8912_dt_match);
749
750 static const struct i2c_device_id lt8912_id[] = {
751 {"lt8912", 0},
752 {},
753 };
754 MODULE_DEVICE_TABLE(i2c, lt8912_id);
755
756 static struct i2c_driver lt8912_i2c_driver = {
757 .driver = {
758 .name = "lt8912",
759 .of_match_table = lt8912_dt_match,
760 },
761 .probe = lt8912_probe,
762 .remove = lt8912_remove,
763 .id_table = lt8912_id,
764 };
765 module_i2c_driver(lt8912_i2c_driver);
766
767 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
768 MODULE_DESCRIPTION("lt8912 drm driver");
769 MODULE_LICENSE("GPL v2");
770
