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 | struct regulator_bulk_data supplies[7]; |
47 | |
48 | u8 data_lanes; |
49 | bool is_power_on; |
50 | }; |
51 | |
52 | static 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 | |
92 | static 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 | |
105 | static 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 | |
158 | static 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 */ |
170 | static 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 | |
203 | static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) |
204 | { |
205 | return container_of(b, struct lt8912, bridge); |
206 | } |
207 | |
208 | static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c) |
209 | { |
210 | return container_of(c, struct lt8912, connector); |
211 | } |
212 | |
213 | static const struct regmap_config lt8912_regmap_config = { |
214 | .reg_bits = 8, |
215 | .val_bits = 8, |
216 | .max_register = 0xff, |
217 | }; |
218 | |
219 | static 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 | <8912_regmap_config); |
244 | if (IS_ERR(ptr: lt->regmap[i])) |
245 | return PTR_ERR(ptr: lt->regmap[i]); |
246 | } |
247 | return 0; |
248 | } |
249 | |
250 | static 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 | |
260 | static 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 | |
274 | static 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 | |
284 | static 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 | |
350 | static 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 | |
366 | static 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 | |
386 | end: |
387 | return ret; |
388 | } |
389 | |
390 | static 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: ®_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 | |
405 | static enum drm_connector_status |
406 | lt8912_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); |
412 | |
413 | return lt8912_check_cable_status(lt); |
414 | } |
415 | |
416 | static 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 | |
425 | static enum drm_mode_status |
426 | lt8912_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 | |
441 | static int lt8912_connector_get_modes(struct drm_connector *connector) |
442 | { |
443 | const struct drm_edid *drm_edid; |
444 | struct lt8912 *lt = connector_to_lt8912(c: connector); |
445 | u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; |
446 | int ret, num; |
447 | |
448 | drm_edid = drm_bridge_edid_read(bridge: lt->hdmi_port, connector); |
449 | drm_edid_connector_update(connector, edid: drm_edid); |
450 | if (!drm_edid) |
451 | return 0; |
452 | |
453 | num = drm_edid_connector_add_modes(connector); |
454 | |
455 | ret = drm_display_info_set_bus_formats(info: &connector->display_info, |
456 | formats: &bus_format, num_formats: 1); |
457 | if (ret < 0) |
458 | num = 0; |
459 | |
460 | drm_edid_free(drm_edid); |
461 | return num; |
462 | } |
463 | |
464 | static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { |
465 | .get_modes = lt8912_connector_get_modes, |
466 | .mode_valid = lt8912_connector_mode_valid, |
467 | }; |
468 | |
469 | static void lt8912_bridge_mode_set(struct drm_bridge *bridge, |
470 | const struct drm_display_mode *mode, |
471 | const struct drm_display_mode *adj) |
472 | { |
473 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
474 | |
475 | drm_display_mode_to_videomode(dmode: adj, vm: <->mode); |
476 | } |
477 | |
478 | static void lt8912_bridge_enable(struct drm_bridge *bridge) |
479 | { |
480 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
481 | |
482 | lt8912_video_on(lt); |
483 | } |
484 | |
485 | static int lt8912_attach_dsi(struct lt8912 *lt) |
486 | { |
487 | struct device *dev = lt->dev; |
488 | struct mipi_dsi_host *host; |
489 | struct mipi_dsi_device *dsi; |
490 | int ret = -1; |
491 | const struct mipi_dsi_device_info info = { .type = "lt8912" , |
492 | .channel = 0, |
493 | .node = NULL, |
494 | }; |
495 | |
496 | host = of_find_mipi_dsi_host_by_node(node: lt->host_node); |
497 | if (!host) { |
498 | dev_err(dev, "failed to find dsi host\n" ); |
499 | return -EPROBE_DEFER; |
500 | } |
501 | |
502 | dsi = devm_mipi_dsi_device_register_full(dev, host, info: &info); |
503 | if (IS_ERR(ptr: dsi)) { |
504 | ret = PTR_ERR(ptr: dsi); |
505 | dev_err(dev, "failed to create dsi device (%d)\n" , ret); |
506 | return ret; |
507 | } |
508 | |
509 | lt->dsi = dsi; |
510 | |
511 | dsi->lanes = lt->data_lanes; |
512 | dsi->format = MIPI_DSI_FMT_RGB888; |
513 | |
514 | dsi->mode_flags = MIPI_DSI_MODE_VIDEO | |
515 | MIPI_DSI_MODE_LPM | |
516 | MIPI_DSI_MODE_NO_EOT_PACKET; |
517 | |
518 | ret = devm_mipi_dsi_attach(dev, dsi); |
519 | if (ret < 0) { |
520 | dev_err(dev, "failed to attach dsi to host\n" ); |
521 | return ret; |
522 | } |
523 | |
524 | return 0; |
525 | } |
526 | |
527 | static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status) |
528 | { |
529 | struct lt8912 *lt = data; |
530 | |
531 | if (lt->bridge.dev) |
532 | drm_helper_hpd_irq_event(dev: lt->bridge.dev); |
533 | } |
534 | |
535 | static int lt8912_bridge_connector_init(struct drm_bridge *bridge) |
536 | { |
537 | int ret; |
538 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
539 | struct drm_connector *connector = <->connector; |
540 | |
541 | if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) { |
542 | drm_bridge_hpd_enable(bridge: lt->hdmi_port, cb: lt8912_bridge_hpd_cb, data: lt); |
543 | connector->polled = DRM_CONNECTOR_POLL_HPD; |
544 | } else { |
545 | connector->polled = DRM_CONNECTOR_POLL_CONNECT | |
546 | DRM_CONNECTOR_POLL_DISCONNECT; |
547 | } |
548 | |
549 | ret = drm_connector_init(dev: bridge->dev, connector, |
550 | funcs: <8912_connector_funcs, |
551 | connector_type: lt->hdmi_port->type); |
552 | if (ret) |
553 | goto exit; |
554 | |
555 | drm_connector_helper_add(connector, funcs: <8912_connector_helper_funcs); |
556 | |
557 | connector->dpms = DRM_MODE_DPMS_OFF; |
558 | drm_connector_attach_encoder(connector, encoder: bridge->encoder); |
559 | |
560 | exit: |
561 | return ret; |
562 | } |
563 | |
564 | static int lt8912_bridge_attach(struct drm_bridge *bridge, |
565 | enum drm_bridge_attach_flags flags) |
566 | { |
567 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
568 | int ret; |
569 | |
570 | ret = drm_bridge_attach(encoder: bridge->encoder, bridge: lt->hdmi_port, previous: bridge, |
571 | flags: DRM_BRIDGE_ATTACH_NO_CONNECTOR); |
572 | if (ret < 0) { |
573 | dev_err(lt->dev, "Failed to attach next bridge (%d)\n" , ret); |
574 | return ret; |
575 | } |
576 | |
577 | if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { |
578 | ret = lt8912_bridge_connector_init(bridge); |
579 | if (ret) { |
580 | dev_err(lt->dev, "Failed to init bridge ! (%d)\n" , ret); |
581 | return ret; |
582 | } |
583 | } |
584 | |
585 | ret = lt8912_hard_power_on(lt); |
586 | if (ret) |
587 | return ret; |
588 | |
589 | ret = lt8912_soft_power_on(lt); |
590 | if (ret) |
591 | goto error; |
592 | |
593 | return 0; |
594 | |
595 | error: |
596 | lt8912_hard_power_off(lt); |
597 | return ret; |
598 | } |
599 | |
600 | static void lt8912_bridge_detach(struct drm_bridge *bridge) |
601 | { |
602 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
603 | |
604 | lt8912_hard_power_off(lt); |
605 | |
606 | if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) |
607 | drm_bridge_hpd_disable(bridge: lt->hdmi_port); |
608 | } |
609 | |
610 | static enum drm_connector_status |
611 | lt8912_bridge_detect(struct drm_bridge *bridge) |
612 | { |
613 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
614 | |
615 | if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) |
616 | return drm_bridge_detect(bridge: lt->hdmi_port); |
617 | |
618 | return lt8912_check_cable_status(lt); |
619 | } |
620 | |
621 | static const struct drm_edid *lt8912_bridge_edid_read(struct drm_bridge *bridge, |
622 | struct drm_connector *connector) |
623 | { |
624 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
625 | |
626 | /* |
627 | * edid must be read through the ddc bus but it must be |
628 | * given to the hdmi connector node. |
629 | */ |
630 | if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) |
631 | return drm_bridge_edid_read(bridge: lt->hdmi_port, connector); |
632 | |
633 | dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n" ); |
634 | return NULL; |
635 | } |
636 | |
637 | static const struct drm_bridge_funcs lt8912_bridge_funcs = { |
638 | .attach = lt8912_bridge_attach, |
639 | .detach = lt8912_bridge_detach, |
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 | |
646 | static 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 | |
662 | static 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 | |
671 | static DEFINE_SIMPLE_DEV_PM_OPS(lt8912_bridge_pm_ops, lt8912_bridge_suspend, lt8912_bridge_resume); |
672 | |
673 | static 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 | |
688 | static 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 | |
746 | err_free_host_node: |
747 | of_node_put(node: port_node); |
748 | of_node_put(node: lt->host_node); |
749 | return ret; |
750 | } |
751 | |
752 | static int lt8912_put_dt(struct lt8912 *lt) |
753 | { |
754 | of_node_put(node: lt->host_node); |
755 | return 0; |
756 | } |
757 | |
758 | static 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_kzalloc(dev, size: sizeof(struct lt8912), GFP_KERNEL); |
765 | if (!lt) |
766 | return -ENOMEM; |
767 | |
768 | lt->dev = dev; |
769 | lt->i2c_client[0] = client; |
770 | |
771 | ret = lt8912_parse_dt(lt); |
772 | if (ret) |
773 | goto err_dt_parse; |
774 | |
775 | ret = lt8912_init_i2c(lt, client); |
776 | if (ret) |
777 | goto err_i2c; |
778 | |
779 | i2c_set_clientdata(client, data: lt); |
780 | |
781 | lt->bridge.funcs = <8912_bridge_funcs; |
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: <->bridge); |
787 | |
788 | ret = lt8912_attach_dsi(lt); |
789 | if (ret) |
790 | goto err_attach; |
791 | |
792 | return 0; |
793 | |
794 | err_attach: |
795 | drm_bridge_remove(bridge: <->bridge); |
796 | lt8912_free_i2c(lt); |
797 | err_i2c: |
798 | lt8912_put_dt(lt); |
799 | err_dt_parse: |
800 | return ret; |
801 | } |
802 | |
803 | static void lt8912_remove(struct i2c_client *client) |
804 | { |
805 | struct lt8912 *lt = i2c_get_clientdata(client); |
806 | |
807 | drm_bridge_remove(bridge: <->bridge); |
808 | lt8912_free_i2c(lt); |
809 | lt8912_put_dt(lt); |
810 | } |
811 | |
812 | static const struct of_device_id lt8912_dt_match[] = { |
813 | {.compatible = "lontium,lt8912b" }, |
814 | {} |
815 | }; |
816 | MODULE_DEVICE_TABLE(of, lt8912_dt_match); |
817 | |
818 | static const struct i2c_device_id lt8912_id[] = { |
819 | {"lt8912" , 0}, |
820 | {}, |
821 | }; |
822 | MODULE_DEVICE_TABLE(i2c, lt8912_id); |
823 | |
824 | static struct i2c_driver lt8912_i2c_driver = { |
825 | .driver = { |
826 | .name = "lt8912" , |
827 | .of_match_table = lt8912_dt_match, |
828 | .pm = pm_sleep_ptr(<8912_bridge_pm_ops), |
829 | }, |
830 | .probe = lt8912_probe, |
831 | .remove = lt8912_remove, |
832 | .id_table = lt8912_id, |
833 | }; |
834 | module_i2c_driver(lt8912_i2c_driver); |
835 | |
836 | MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>" ); |
837 | MODULE_DESCRIPTION("lt8912 drm driver" ); |
838 | MODULE_LICENSE("GPL v2" ); |
839 | |