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 };
49
lt8912_write_init_config(struct lt8912 * lt)50 static int lt8912_write_init_config(struct lt8912 *lt)
51 {
52 const struct reg_sequence seq[] = {
53 /* Digital clock en*/
54 {0x08, 0xff},
55 {0x09, 0xff},
56 {0x0a, 0xff},
57 {0x0b, 0x7c},
58 {0x0c, 0xff},
59 {0x42, 0x04},
60
61 /*Tx Analog*/
62 {0x31, 0xb1},
63 {0x32, 0xb1},
64 {0x33, 0x0e},
65 {0x37, 0x00},
66 {0x38, 0x22},
67 {0x60, 0x82},
68
69 /*Cbus Analog*/
70 {0x39, 0x45},
71 {0x3a, 0x00},
72 {0x3b, 0x00},
73
74 /*HDMI Pll Analog*/
75 {0x44, 0x31},
76 {0x55, 0x44},
77 {0x57, 0x01},
78 {0x5a, 0x02},
79
80 /*MIPI Analog*/
81 {0x3e, 0xd6},
82 {0x3f, 0xd4},
83 {0x41, 0x3c},
84 {0xB2, 0x00},
85 };
86
87 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
88 }
89
lt8912_write_mipi_basic_config(struct lt8912 * lt)90 static int lt8912_write_mipi_basic_config(struct lt8912 *lt)
91 {
92 const struct reg_sequence seq[] = {
93 {0x12, 0x04},
94 {0x14, 0x00},
95 {0x15, 0x00},
96 {0x1a, 0x03},
97 {0x1b, 0x03},
98 };
99
100 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
101 };
102
lt8912_write_dds_config(struct lt8912 * lt)103 static int lt8912_write_dds_config(struct lt8912 *lt)
104 {
105 const struct reg_sequence seq[] = {
106 {0x4e, 0xff},
107 {0x4f, 0x56},
108 {0x50, 0x69},
109 {0x51, 0x80},
110 {0x1f, 0x5e},
111 {0x20, 0x01},
112 {0x21, 0x2c},
113 {0x22, 0x01},
114 {0x23, 0xfa},
115 {0x24, 0x00},
116 {0x25, 0xc8},
117 {0x26, 0x00},
118 {0x27, 0x5e},
119 {0x28, 0x01},
120 {0x29, 0x2c},
121 {0x2a, 0x01},
122 {0x2b, 0xfa},
123 {0x2c, 0x00},
124 {0x2d, 0xc8},
125 {0x2e, 0x00},
126 {0x42, 0x64},
127 {0x43, 0x00},
128 {0x44, 0x04},
129 {0x45, 0x00},
130 {0x46, 0x59},
131 {0x47, 0x00},
132 {0x48, 0xf2},
133 {0x49, 0x06},
134 {0x4a, 0x00},
135 {0x4b, 0x72},
136 {0x4c, 0x45},
137 {0x4d, 0x00},
138 {0x52, 0x08},
139 {0x53, 0x00},
140 {0x54, 0xb2},
141 {0x55, 0x00},
142 {0x56, 0xe4},
143 {0x57, 0x0d},
144 {0x58, 0x00},
145 {0x59, 0xe4},
146 {0x5a, 0x8a},
147 {0x5b, 0x00},
148 {0x5c, 0x34},
149 {0x1e, 0x4f},
150 {0x51, 0x00},
151 };
152
153 return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
154 }
155
lt8912_write_rxlogicres_config(struct lt8912 * lt)156 static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
157 {
158 int ret;
159
160 ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);
161 usleep_range(10000, 20000);
162 ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff);
163
164 return ret;
165 };
166
167 /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */
lt8912_write_lvds_config(struct lt8912 * lt)168 static int lt8912_write_lvds_config(struct lt8912 *lt)
169 {
170 const struct reg_sequence seq[] = {
171 // lvds power up
172 {0x44, 0x30},
173 {0x51, 0x05},
174
175 // core pll bypass
176 {0x50, 0x24}, // cp=50uA
177 {0x51, 0x2d}, // Pix_clk as reference, second order passive LPF PLL
178 {0x52, 0x04}, // loopdiv=0, use second-order PLL
179 {0x69, 0x0e}, // CP_PRESET_DIV_RATIO
180 {0x69, 0x8e},
181 {0x6a, 0x00},
182 {0x6c, 0xb8}, // RGD_CP_SOFT_K_EN,RGD_CP_SOFT_K[13:8]
183 {0x6b, 0x51},
184
185 {0x04, 0xfb}, // core pll reset
186 {0x04, 0xff},
187
188 // scaler bypass
189 {0x7f, 0x00}, // disable scaler
190 {0xa8, 0x13}, // 0x13: JEIDA, 0x33: VESA
191
192 {0x02, 0xf7}, // lvds pll reset
193 {0x02, 0xff},
194 {0x03, 0xcf},
195 {0x03, 0xff},
196 };
197
198 return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
199 };
200
bridge_to_lt8912(struct drm_bridge * b)201 static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
202 {
203 return container_of(b, struct lt8912, bridge);
204 }
205
connector_to_lt8912(struct drm_connector * c)206 static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
207 {
208 return container_of(c, struct lt8912, connector);
209 }
210
211 static const struct regmap_config lt8912_regmap_config = {
212 .reg_bits = 8,
213 .val_bits = 8,
214 .max_register = 0xff,
215 };
216
lt8912_init_i2c(struct lt8912 * lt,struct i2c_client * client)217 static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client)
218 {
219 unsigned int i;
220 /*
221 * At this time we only initialize 2 chips, but the lt8912 provides
222 * a third interface for the audio over HDMI configuration.
223 */
224 struct i2c_board_info info[] = {
225 { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },
226 { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },
227 };
228
229 if (!lt)
230 return -ENODEV;
231
232 for (i = 0; i < ARRAY_SIZE(info); i++) {
233 if (i > 0) {
234 lt->i2c_client[i] = i2c_new_dummy_device(client->adapter,
235 info[i].addr);
236 if (IS_ERR(lt->i2c_client[i]))
237 return PTR_ERR(lt->i2c_client[i]);
238 }
239
240 lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],
241 <8912_regmap_config);
242 if (IS_ERR(lt->regmap[i]))
243 return PTR_ERR(lt->regmap[i]);
244 }
245 return 0;
246 }
247
lt8912_free_i2c(struct lt8912 * lt)248 static int lt8912_free_i2c(struct lt8912 *lt)
249 {
250 unsigned int i;
251
252 for (i = 1; i < I2C_MAX_IDX; i++)
253 i2c_unregister_device(lt->i2c_client[i]);
254
255 return 0;
256 }
257
lt8912_hard_power_on(struct lt8912 * lt)258 static int lt8912_hard_power_on(struct lt8912 *lt)
259 {
260 gpiod_set_value_cansleep(lt->gp_reset, 0);
261 msleep(20);
262
263 return 0;
264 }
265
lt8912_hard_power_off(struct lt8912 * lt)266 static void lt8912_hard_power_off(struct lt8912 *lt)
267 {
268 gpiod_set_value_cansleep(lt->gp_reset, 1);
269 msleep(20);
270 lt->is_power_on = false;
271 }
272
lt8912_video_setup(struct lt8912 * lt)273 static int lt8912_video_setup(struct lt8912 *lt)
274 {
275 u32 hactive, h_total, hpw, hfp, hbp;
276 u32 vactive, v_total, vpw, vfp, vbp;
277 u8 settle = 0x08;
278 int ret, hsync_activehigh, vsync_activehigh;
279
280 if (!lt)
281 return -EINVAL;
282
283 hactive = lt->mode.hactive;
284 hfp = lt->mode.hfront_porch;
285 hpw = lt->mode.hsync_len;
286 hbp = lt->mode.hback_porch;
287 h_total = hactive + hfp + hpw + hbp;
288 hsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_HSYNC_HIGH;
289
290 vactive = lt->mode.vactive;
291 vfp = lt->mode.vfront_porch;
292 vpw = lt->mode.vsync_len;
293 vbp = lt->mode.vback_porch;
294 v_total = vactive + vfp + vpw + vbp;
295 vsync_activehigh = lt->mode.flags & DISPLAY_FLAGS_VSYNC_HIGH;
296
297 if (vactive <= 600)
298 settle = 0x04;
299 else if (vactive == 1080)
300 settle = 0x0a;
301
302 ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);
303 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);
304 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);
305 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);
306 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff);
307 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8);
308
309 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);
310
311 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff);
312 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8);
313
314 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff);
315 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8);
316
317 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff);
318 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8);
319
320 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff);
321 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8);
322
323 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff);
324 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8);
325
326 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);
327 ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);
328
329 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(0),
330 vsync_activehigh ? BIT(0) : 0);
331 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1),
332 hsync_activehigh ? BIT(1) : 0);
333 ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0),
334 lt->connector.display_info.is_hdmi ? BIT(0) : 0);
335
336 return ret;
337 }
338
lt8912_soft_power_on(struct lt8912 * lt)339 static int lt8912_soft_power_on(struct lt8912 *lt)
340 {
341 if (!lt->is_power_on) {
342 u32 lanes = lt->data_lanes;
343
344 lt8912_write_init_config(lt);
345 regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3);
346
347 lt8912_write_mipi_basic_config(lt);
348
349 lt->is_power_on = true;
350 }
351
352 return 0;
353 }
354
lt8912_video_on(struct lt8912 * lt)355 static int lt8912_video_on(struct lt8912 *lt)
356 {
357 int ret;
358
359 ret = lt8912_video_setup(lt);
360 if (ret < 0)
361 goto end;
362
363 ret = lt8912_write_dds_config(lt);
364 if (ret < 0)
365 goto end;
366
367 ret = lt8912_write_rxlogicres_config(lt);
368 if (ret < 0)
369 goto end;
370
371 ret = lt8912_write_lvds_config(lt);
372 if (ret < 0)
373 goto end;
374
375 end:
376 return ret;
377 }
378
lt8912_check_cable_status(struct lt8912 * lt)379 static enum drm_connector_status lt8912_check_cable_status(struct lt8912 *lt)
380 {
381 int ret;
382 unsigned int reg_val;
383
384 ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, ®_val);
385 if (ret)
386 return connector_status_unknown;
387
388 if (reg_val & BIT(7))
389 return connector_status_connected;
390
391 return connector_status_disconnected;
392 }
393
394 static enum drm_connector_status
lt8912_connector_detect(struct drm_connector * connector,bool force)395 lt8912_connector_detect(struct drm_connector *connector, bool force)
396 {
397 struct lt8912 *lt = connector_to_lt8912(connector);
398
399 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
400 return drm_bridge_detect(lt->hdmi_port);
401
402 return lt8912_check_cable_status(lt);
403 }
404
405 static const struct drm_connector_funcs lt8912_connector_funcs = {
406 .detect = lt8912_connector_detect,
407 .fill_modes = drm_helper_probe_single_connector_modes,
408 .destroy = drm_connector_cleanup,
409 .reset = drm_atomic_helper_connector_reset,
410 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
411 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
412 };
413
lt8912_connector_get_modes(struct drm_connector * connector)414 static int lt8912_connector_get_modes(struct drm_connector *connector)
415 {
416 const struct drm_edid *drm_edid;
417 struct lt8912 *lt = connector_to_lt8912(connector);
418 u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
419 int ret, num;
420
421 drm_edid = drm_bridge_edid_read(lt->hdmi_port, connector);
422 drm_edid_connector_update(connector, drm_edid);
423 if (!drm_edid)
424 return 0;
425
426 num = drm_edid_connector_add_modes(connector);
427
428 ret = drm_display_info_set_bus_formats(&connector->display_info,
429 &bus_format, 1);
430 if (ret < 0)
431 num = 0;
432
433 drm_edid_free(drm_edid);
434 return num;
435 }
436
437 static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
438 .get_modes = lt8912_connector_get_modes,
439 };
440
lt8912_bridge_mode_set(struct drm_bridge * bridge,const struct drm_display_mode * mode,const struct drm_display_mode * adj)441 static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
442 const struct drm_display_mode *mode,
443 const struct drm_display_mode *adj)
444 {
445 struct lt8912 *lt = bridge_to_lt8912(bridge);
446
447 drm_display_mode_to_videomode(adj, <->mode);
448 }
449
lt8912_bridge_enable(struct drm_bridge * bridge)450 static void lt8912_bridge_enable(struct drm_bridge *bridge)
451 {
452 struct lt8912 *lt = bridge_to_lt8912(bridge);
453
454 lt8912_video_on(lt);
455 }
456
lt8912_attach_dsi(struct lt8912 * lt)457 static int lt8912_attach_dsi(struct lt8912 *lt)
458 {
459 struct device *dev = lt->dev;
460 struct mipi_dsi_host *host;
461 struct mipi_dsi_device *dsi;
462 int ret = -1;
463 const struct mipi_dsi_device_info info = { .type = "lt8912",
464 .channel = 0,
465 .node = NULL,
466 };
467
468 host = of_find_mipi_dsi_host_by_node(lt->host_node);
469 if (!host)
470 return dev_err_probe(dev, -EPROBE_DEFER, "failed to find dsi host\n");
471
472 dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
473 if (IS_ERR(dsi)) {
474 ret = PTR_ERR(dsi);
475 dev_err(dev, "failed to create dsi device (%d)\n", ret);
476 return ret;
477 }
478
479 lt->dsi = dsi;
480
481 dsi->lanes = lt->data_lanes;
482 dsi->format = MIPI_DSI_FMT_RGB888;
483
484 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
485 MIPI_DSI_MODE_LPM |
486 MIPI_DSI_MODE_NO_EOT_PACKET;
487
488 ret = devm_mipi_dsi_attach(dev, dsi);
489 if (ret < 0) {
490 dev_err(dev, "failed to attach dsi to host\n");
491 return ret;
492 }
493
494 return 0;
495 }
496
lt8912_bridge_hpd_cb(void * data,enum drm_connector_status status)497 static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status)
498 {
499 struct lt8912 *lt = data;
500
501 if (lt->bridge.dev)
502 drm_helper_hpd_irq_event(lt->bridge.dev);
503 }
504
lt8912_bridge_connector_init(struct drm_bridge * bridge)505 static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
506 {
507 int ret;
508 struct lt8912 *lt = bridge_to_lt8912(bridge);
509 struct drm_connector *connector = <->connector;
510
511 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) {
512 drm_bridge_hpd_enable(lt->hdmi_port, lt8912_bridge_hpd_cb, lt);
513 connector->polled = DRM_CONNECTOR_POLL_HPD;
514 } else {
515 connector->polled = DRM_CONNECTOR_POLL_CONNECT |
516 DRM_CONNECTOR_POLL_DISCONNECT;
517 }
518
519 ret = drm_connector_init(bridge->dev, connector,
520 <8912_connector_funcs,
521 lt->hdmi_port->type);
522 if (ret)
523 goto exit;
524
525 drm_connector_helper_add(connector, <8912_connector_helper_funcs);
526
527 connector->dpms = DRM_MODE_DPMS_OFF;
528 drm_connector_attach_encoder(connector, bridge->encoder);
529
530 exit:
531 return ret;
532 }
533
lt8912_bridge_attach(struct drm_bridge * bridge,enum drm_bridge_attach_flags flags)534 static int lt8912_bridge_attach(struct drm_bridge *bridge,
535 enum drm_bridge_attach_flags flags)
536 {
537 struct lt8912 *lt = bridge_to_lt8912(bridge);
538 int ret;
539
540 ret = drm_bridge_attach(bridge->encoder, lt->hdmi_port, bridge,
541 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
542 if (ret < 0) {
543 dev_err(lt->dev, "Failed to attach next bridge (%d)\n", ret);
544 return ret;
545 }
546
547 if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
548 ret = lt8912_bridge_connector_init(bridge);
549 if (ret) {
550 dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);
551 return ret;
552 }
553 }
554
555 ret = lt8912_hard_power_on(lt);
556 if (ret)
557 return ret;
558
559 ret = lt8912_soft_power_on(lt);
560 if (ret)
561 goto error;
562
563 return 0;
564
565 error:
566 lt8912_hard_power_off(lt);
567 return ret;
568 }
569
lt8912_bridge_detach(struct drm_bridge * bridge)570 static void lt8912_bridge_detach(struct drm_bridge *bridge)
571 {
572 struct lt8912 *lt = bridge_to_lt8912(bridge);
573
574 lt8912_hard_power_off(lt);
575
576 if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD)
577 drm_bridge_hpd_disable(lt->hdmi_port);
578 }
579
580 static enum drm_mode_status
lt8912_bridge_mode_valid(struct drm_bridge * bridge,const struct drm_display_info * info,const struct drm_display_mode * mode)581 lt8912_bridge_mode_valid(struct drm_bridge *bridge,
582 const struct drm_display_info *info,
583 const struct drm_display_mode *mode)
584 {
585 if (mode->clock > 150000)
586 return MODE_CLOCK_HIGH;
587
588 if (mode->hdisplay > 1920)
589 return MODE_BAD_HVALUE;
590
591 if (mode->vdisplay > 1080)
592 return MODE_BAD_VVALUE;
593
594 return MODE_OK;
595 }
596
597 static enum drm_connector_status
lt8912_bridge_detect(struct drm_bridge * bridge)598 lt8912_bridge_detect(struct drm_bridge *bridge)
599 {
600 struct lt8912 *lt = bridge_to_lt8912(bridge);
601
602 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
603 return drm_bridge_detect(lt->hdmi_port);
604
605 return lt8912_check_cable_status(lt);
606 }
607
lt8912_bridge_get_edid(struct drm_bridge * bridge,struct drm_connector * connector)608 static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge,
609 struct drm_connector *connector)
610 {
611 struct lt8912 *lt = bridge_to_lt8912(bridge);
612
613 /*
614 * edid must be read through the ddc bus but it must be
615 * given to the hdmi connector node.
616 */
617 if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)
618 return drm_bridge_get_edid(lt->hdmi_port, connector);
619
620 dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");
621 return NULL;
622 }
623
624 static const struct drm_bridge_funcs lt8912_bridge_funcs = {
625 .attach = lt8912_bridge_attach,
626 .detach = lt8912_bridge_detach,
627 .mode_valid = lt8912_bridge_mode_valid,
628 .mode_set = lt8912_bridge_mode_set,
629 .enable = lt8912_bridge_enable,
630 .detect = lt8912_bridge_detect,
631 .get_edid = lt8912_bridge_get_edid,
632 };
633
lt8912_parse_dt(struct lt8912 * lt)634 static int lt8912_parse_dt(struct lt8912 *lt)
635 {
636 struct gpio_desc *gp_reset;
637 struct device *dev = lt->dev;
638 int ret;
639 int data_lanes;
640 struct device_node *port_node;
641
642 gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
643 if (IS_ERR(gp_reset)) {
644 ret = PTR_ERR(gp_reset);
645 if (ret != -EPROBE_DEFER)
646 dev_err(dev, "Failed to get reset gpio: %d\n", ret);
647 return ret;
648 }
649 lt->gp_reset = gp_reset;
650
651 data_lanes = drm_of_get_data_lanes_count_ep(dev->of_node, 0, -1, 1, 4);
652 if (data_lanes < 0) {
653 dev_err(lt->dev, "%s: Bad data-lanes property\n", __func__);
654 return data_lanes;
655 }
656
657 lt->data_lanes = data_lanes;
658
659 lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
660 if (!lt->host_node) {
661 dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
662 return -ENODEV;
663 }
664
665 port_node = of_graph_get_remote_node(dev->of_node, 1, -1);
666 if (!port_node) {
667 dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);
668 ret = -ENODEV;
669 goto err_free_host_node;
670 }
671
672 lt->hdmi_port = of_drm_find_bridge(port_node);
673 if (!lt->hdmi_port) {
674 ret = -EPROBE_DEFER;
675 dev_err_probe(lt->dev, ret, "%s: Failed to get hdmi port\n", __func__);
676 goto err_free_host_node;
677 }
678
679 if (!of_device_is_compatible(port_node, "hdmi-connector")) {
680 dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
681 ret = -EINVAL;
682 goto err_free_host_node;
683 }
684
685 of_node_put(port_node);
686 return 0;
687
688 err_free_host_node:
689 of_node_put(port_node);
690 of_node_put(lt->host_node);
691 return ret;
692 }
693
lt8912_put_dt(struct lt8912 * lt)694 static int lt8912_put_dt(struct lt8912 *lt)
695 {
696 of_node_put(lt->host_node);
697 return 0;
698 }
699
lt8912_probe(struct i2c_client * client)700 static int lt8912_probe(struct i2c_client *client)
701 {
702 static struct lt8912 *lt;
703 int ret = 0;
704 struct device *dev = &client->dev;
705
706 lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);
707 if (!lt)
708 return -ENOMEM;
709
710 lt->dev = dev;
711 lt->i2c_client[0] = client;
712
713 ret = lt8912_parse_dt(lt);
714 if (ret)
715 goto err_dt_parse;
716
717 ret = lt8912_init_i2c(lt, client);
718 if (ret)
719 goto err_i2c;
720
721 i2c_set_clientdata(client, lt);
722
723 lt->bridge.funcs = <8912_bridge_funcs;
724 lt->bridge.of_node = dev->of_node;
725 lt->bridge.ops = (DRM_BRIDGE_OP_EDID |
726 DRM_BRIDGE_OP_DETECT);
727
728 drm_bridge_add(<->bridge);
729
730 ret = lt8912_attach_dsi(lt);
731 if (ret)
732 goto err_attach;
733
734 return 0;
735
736 err_attach:
737 drm_bridge_remove(<->bridge);
738 lt8912_free_i2c(lt);
739 err_i2c:
740 lt8912_put_dt(lt);
741 err_dt_parse:
742 return ret;
743 }
744
lt8912_remove(struct i2c_client * client)745 static void lt8912_remove(struct i2c_client *client)
746 {
747 struct lt8912 *lt = i2c_get_clientdata(client);
748
749 drm_bridge_remove(<->bridge);
750 lt8912_free_i2c(lt);
751 lt8912_put_dt(lt);
752 }
753
754 static const struct of_device_id lt8912_dt_match[] = {
755 {.compatible = "lontium,lt8912b"},
756 {}
757 };
758 MODULE_DEVICE_TABLE(of, lt8912_dt_match);
759
760 static const struct i2c_device_id lt8912_id[] = {
761 {"lt8912", 0},
762 {},
763 };
764 MODULE_DEVICE_TABLE(i2c, lt8912_id);
765
766 static struct i2c_driver lt8912_i2c_driver = {
767 .driver = {
768 .name = "lt8912",
769 .of_match_table = lt8912_dt_match,
770 },
771 .probe = lt8912_probe,
772 .remove = lt8912_remove,
773 .id_table = lt8912_id,
774 };
775 module_i2c_driver(lt8912_i2c_driver);
776
777 MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
778 MODULE_DESCRIPTION("lt8912 drm driver");
779 MODULE_LICENSE("GPL v2");
780