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 | |
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(map: lt->regmap[I2C_MAIN], regs: seq, ARRAY_SIZE(seq)); |
88 | } |
89 | |
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(map: lt->regmap[I2C_CEC_DSI], regs: seq, ARRAY_SIZE(seq)); |
101 | }; |
102 | |
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(map: lt->regmap[I2C_CEC_DSI], regs: seq, ARRAY_SIZE(seq)); |
154 | } |
155 | |
156 | static int lt8912_write_rxlogicres_config(struct lt8912 *lt) |
157 | { |
158 | int ret; |
159 | |
160 | ret = regmap_write(map: lt->regmap[I2C_MAIN], reg: 0x03, val: 0x7f); |
161 | usleep_range(min: 10000, max: 20000); |
162 | ret |= regmap_write(map: lt->regmap[I2C_MAIN], reg: 0x03, val: 0xff); |
163 | |
164 | return ret; |
165 | }; |
166 | |
167 | /* enable LVDS output with some hardcoded configuration, not required for the HDMI output */ |
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(map: lt->regmap[I2C_MAIN], regs: seq, ARRAY_SIZE(seq)); |
199 | }; |
200 | |
201 | static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b) |
202 | { |
203 | return container_of(b, struct lt8912, bridge); |
204 | } |
205 | |
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 | |
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(adapter: client->adapter, |
235 | address: info[i].addr); |
236 | if (IS_ERR(ptr: lt->i2c_client[i])) |
237 | return PTR_ERR(ptr: 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(ptr: lt->regmap[i])) |
243 | return PTR_ERR(ptr: lt->regmap[i]); |
244 | } |
245 | return 0; |
246 | } |
247 | |
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(client: lt->i2c_client[i]); |
254 | |
255 | return 0; |
256 | } |
257 | |
258 | static int lt8912_hard_power_on(struct lt8912 *lt) |
259 | { |
260 | gpiod_set_value_cansleep(desc: lt->gp_reset, value: 0); |
261 | msleep(msecs: 20); |
262 | |
263 | return 0; |
264 | } |
265 | |
266 | static void lt8912_hard_power_off(struct lt8912 *lt) |
267 | { |
268 | gpiod_set_value_cansleep(desc: lt->gp_reset, value: 1); |
269 | msleep(msecs: 20); |
270 | lt->is_power_on = false; |
271 | } |
272 | |
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(map: lt->regmap[I2C_CEC_DSI], reg: 0x10, val: 0x01); |
303 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x11, val: settle); |
304 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x18, val: hpw); |
305 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x19, val: vpw); |
306 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x1c, val: hactive & 0xff); |
307 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x1d, val: hactive >> 8); |
308 | |
309 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x2f, val: 0x0c); |
310 | |
311 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x34, val: h_total & 0xff); |
312 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x35, val: h_total >> 8); |
313 | |
314 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x36, val: v_total & 0xff); |
315 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x37, val: v_total >> 8); |
316 | |
317 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x38, val: vbp & 0xff); |
318 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x39, val: vbp >> 8); |
319 | |
320 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3a, val: vfp & 0xff); |
321 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3b, val: vfp >> 8); |
322 | |
323 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3c, val: hbp & 0xff); |
324 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3d, val: hbp >> 8); |
325 | |
326 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3e, val: hfp & 0xff); |
327 | ret |= regmap_write(map: lt->regmap[I2C_CEC_DSI], reg: 0x3f, val: hfp >> 8); |
328 | |
329 | ret |= regmap_update_bits(map: lt->regmap[I2C_MAIN], reg: 0xab, BIT(0), |
330 | val: vsync_activehigh ? BIT(0) : 0); |
331 | ret |= regmap_update_bits(map: lt->regmap[I2C_MAIN], reg: 0xab, BIT(1), |
332 | val: hsync_activehigh ? BIT(1) : 0); |
333 | ret |= regmap_update_bits(map: lt->regmap[I2C_MAIN], reg: 0xb2, BIT(0), |
334 | val: lt->connector.display_info.is_hdmi ? BIT(0) : 0); |
335 | |
336 | return ret; |
337 | } |
338 | |
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(map: lt->regmap[I2C_CEC_DSI], reg: 0x13, val: lanes & 3); |
346 | |
347 | lt8912_write_mipi_basic_config(lt); |
348 | |
349 | lt->is_power_on = true; |
350 | } |
351 | |
352 | return 0; |
353 | } |
354 | |
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 | |
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(map: lt->regmap[I2C_MAIN], reg: 0xC1, val: ®_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 |
395 | lt8912_connector_detect(struct drm_connector *connector, bool force) |
396 | { |
397 | struct lt8912 *lt = connector_to_lt8912(c: connector); |
398 | |
399 | if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) |
400 | return drm_bridge_detect(bridge: 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 | |
414 | static enum drm_mode_status |
415 | lt8912_connector_mode_valid(struct drm_connector *connector, |
416 | struct drm_display_mode *mode) |
417 | { |
418 | if (mode->clock > 150000) |
419 | return MODE_CLOCK_HIGH; |
420 | |
421 | if (mode->hdisplay > 1920) |
422 | return MODE_BAD_HVALUE; |
423 | |
424 | if (mode->vdisplay > 1080) |
425 | return MODE_BAD_VVALUE; |
426 | |
427 | return MODE_OK; |
428 | } |
429 | |
430 | static int lt8912_connector_get_modes(struct drm_connector *connector) |
431 | { |
432 | struct edid *edid; |
433 | int ret = -1; |
434 | int num = 0; |
435 | struct lt8912 *lt = connector_to_lt8912(c: connector); |
436 | u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; |
437 | |
438 | edid = drm_bridge_get_edid(bridge: lt->hdmi_port, connector); |
439 | if (edid) { |
440 | drm_connector_update_edid_property(connector, edid); |
441 | num = drm_add_edid_modes(connector, edid); |
442 | } else { |
443 | return ret; |
444 | } |
445 | |
446 | ret = drm_display_info_set_bus_formats(info: &connector->display_info, |
447 | formats: &bus_format, num_formats: 1); |
448 | if (ret) |
449 | num = ret; |
450 | |
451 | kfree(objp: edid); |
452 | return num; |
453 | } |
454 | |
455 | static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = { |
456 | .get_modes = lt8912_connector_get_modes, |
457 | .mode_valid = lt8912_connector_mode_valid, |
458 | }; |
459 | |
460 | static void lt8912_bridge_mode_set(struct drm_bridge *bridge, |
461 | const struct drm_display_mode *mode, |
462 | const struct drm_display_mode *adj) |
463 | { |
464 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
465 | |
466 | drm_display_mode_to_videomode(dmode: adj, vm: <->mode); |
467 | } |
468 | |
469 | static void lt8912_bridge_enable(struct drm_bridge *bridge) |
470 | { |
471 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
472 | |
473 | lt8912_video_on(lt); |
474 | } |
475 | |
476 | static int lt8912_attach_dsi(struct lt8912 *lt) |
477 | { |
478 | struct device *dev = lt->dev; |
479 | struct mipi_dsi_host *host; |
480 | struct mipi_dsi_device *dsi; |
481 | int ret = -1; |
482 | const struct mipi_dsi_device_info info = { .type = "lt8912" , |
483 | .channel = 0, |
484 | .node = NULL, |
485 | }; |
486 | |
487 | host = of_find_mipi_dsi_host_by_node(node: lt->host_node); |
488 | if (!host) { |
489 | dev_err(dev, "failed to find dsi host\n" ); |
490 | return -EPROBE_DEFER; |
491 | } |
492 | |
493 | dsi = devm_mipi_dsi_device_register_full(dev, host, info: &info); |
494 | if (IS_ERR(ptr: dsi)) { |
495 | ret = PTR_ERR(ptr: dsi); |
496 | dev_err(dev, "failed to create dsi device (%d)\n" , ret); |
497 | return ret; |
498 | } |
499 | |
500 | lt->dsi = dsi; |
501 | |
502 | dsi->lanes = lt->data_lanes; |
503 | dsi->format = MIPI_DSI_FMT_RGB888; |
504 | |
505 | dsi->mode_flags = MIPI_DSI_MODE_VIDEO | |
506 | MIPI_DSI_MODE_LPM | |
507 | MIPI_DSI_MODE_NO_EOT_PACKET; |
508 | |
509 | ret = devm_mipi_dsi_attach(dev, dsi); |
510 | if (ret < 0) { |
511 | dev_err(dev, "failed to attach dsi to host\n" ); |
512 | return ret; |
513 | } |
514 | |
515 | return 0; |
516 | } |
517 | |
518 | static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status) |
519 | { |
520 | struct lt8912 *lt = data; |
521 | |
522 | if (lt->bridge.dev) |
523 | drm_helper_hpd_irq_event(dev: lt->bridge.dev); |
524 | } |
525 | |
526 | static int lt8912_bridge_connector_init(struct drm_bridge *bridge) |
527 | { |
528 | int ret; |
529 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
530 | struct drm_connector *connector = <->connector; |
531 | |
532 | if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) { |
533 | drm_bridge_hpd_enable(bridge: lt->hdmi_port, cb: lt8912_bridge_hpd_cb, data: lt); |
534 | connector->polled = DRM_CONNECTOR_POLL_HPD; |
535 | } else { |
536 | connector->polled = DRM_CONNECTOR_POLL_CONNECT | |
537 | DRM_CONNECTOR_POLL_DISCONNECT; |
538 | } |
539 | |
540 | ret = drm_connector_init(dev: bridge->dev, connector, |
541 | funcs: <8912_connector_funcs, |
542 | connector_type: lt->hdmi_port->type); |
543 | if (ret) |
544 | goto exit; |
545 | |
546 | drm_connector_helper_add(connector, funcs: <8912_connector_helper_funcs); |
547 | |
548 | connector->dpms = DRM_MODE_DPMS_OFF; |
549 | drm_connector_attach_encoder(connector, encoder: bridge->encoder); |
550 | |
551 | exit: |
552 | return ret; |
553 | } |
554 | |
555 | static int lt8912_bridge_attach(struct drm_bridge *bridge, |
556 | enum drm_bridge_attach_flags flags) |
557 | { |
558 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
559 | int ret; |
560 | |
561 | ret = drm_bridge_attach(encoder: bridge->encoder, bridge: lt->hdmi_port, previous: bridge, |
562 | flags: DRM_BRIDGE_ATTACH_NO_CONNECTOR); |
563 | if (ret < 0) { |
564 | dev_err(lt->dev, "Failed to attach next bridge (%d)\n" , ret); |
565 | return ret; |
566 | } |
567 | |
568 | if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) { |
569 | ret = lt8912_bridge_connector_init(bridge); |
570 | if (ret) { |
571 | dev_err(lt->dev, "Failed to init bridge ! (%d)\n" , ret); |
572 | return ret; |
573 | } |
574 | } |
575 | |
576 | ret = lt8912_hard_power_on(lt); |
577 | if (ret) |
578 | return ret; |
579 | |
580 | ret = lt8912_soft_power_on(lt); |
581 | if (ret) |
582 | goto error; |
583 | |
584 | return 0; |
585 | |
586 | error: |
587 | lt8912_hard_power_off(lt); |
588 | return ret; |
589 | } |
590 | |
591 | static void lt8912_bridge_detach(struct drm_bridge *bridge) |
592 | { |
593 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
594 | |
595 | lt8912_hard_power_off(lt); |
596 | |
597 | if (lt->connector.dev && lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD) |
598 | drm_bridge_hpd_disable(bridge: lt->hdmi_port); |
599 | } |
600 | |
601 | static enum drm_connector_status |
602 | lt8912_bridge_detect(struct drm_bridge *bridge) |
603 | { |
604 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
605 | |
606 | if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT) |
607 | return drm_bridge_detect(bridge: lt->hdmi_port); |
608 | |
609 | return lt8912_check_cable_status(lt); |
610 | } |
611 | |
612 | static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge, |
613 | struct drm_connector *connector) |
614 | { |
615 | struct lt8912 *lt = bridge_to_lt8912(b: bridge); |
616 | |
617 | /* |
618 | * edid must be read through the ddc bus but it must be |
619 | * given to the hdmi connector node. |
620 | */ |
621 | if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID) |
622 | return drm_bridge_get_edid(bridge: lt->hdmi_port, connector); |
623 | |
624 | dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n" ); |
625 | return NULL; |
626 | } |
627 | |
628 | static const struct drm_bridge_funcs lt8912_bridge_funcs = { |
629 | .attach = lt8912_bridge_attach, |
630 | .detach = lt8912_bridge_detach, |
631 | .mode_set = lt8912_bridge_mode_set, |
632 | .enable = lt8912_bridge_enable, |
633 | .detect = lt8912_bridge_detect, |
634 | .get_edid = lt8912_bridge_get_edid, |
635 | }; |
636 | |
637 | static int lt8912_parse_dt(struct lt8912 *lt) |
638 | { |
639 | struct gpio_desc *gp_reset; |
640 | struct device *dev = lt->dev; |
641 | int ret; |
642 | int data_lanes; |
643 | struct device_node *port_node; |
644 | |
645 | gp_reset = devm_gpiod_get_optional(dev, con_id: "reset" , flags: GPIOD_OUT_HIGH); |
646 | if (IS_ERR(ptr: gp_reset)) { |
647 | ret = PTR_ERR(ptr: gp_reset); |
648 | if (ret != -EPROBE_DEFER) |
649 | dev_err(dev, "Failed to get reset gpio: %d\n" , ret); |
650 | return ret; |
651 | } |
652 | lt->gp_reset = gp_reset; |
653 | |
654 | data_lanes = drm_of_get_data_lanes_count_ep(port: dev->of_node, port_reg: 0, reg: -1, min: 1, max: 4); |
655 | if (data_lanes < 0) { |
656 | dev_err(lt->dev, "%s: Bad data-lanes property\n" , __func__); |
657 | return data_lanes; |
658 | } |
659 | |
660 | lt->data_lanes = data_lanes; |
661 | |
662 | lt->host_node = of_graph_get_remote_node(node: dev->of_node, port: 0, endpoint: -1); |
663 | if (!lt->host_node) { |
664 | dev_err(lt->dev, "%s: Failed to get remote port\n" , __func__); |
665 | return -ENODEV; |
666 | } |
667 | |
668 | port_node = of_graph_get_remote_node(node: dev->of_node, port: 1, endpoint: -1); |
669 | if (!port_node) { |
670 | dev_err(lt->dev, "%s: Failed to get connector port\n" , __func__); |
671 | ret = -ENODEV; |
672 | goto err_free_host_node; |
673 | } |
674 | |
675 | lt->hdmi_port = of_drm_find_bridge(np: port_node); |
676 | if (!lt->hdmi_port) { |
677 | ret = -EPROBE_DEFER; |
678 | dev_err_probe(dev: lt->dev, err: ret, fmt: "%s: Failed to get hdmi port\n" , __func__); |
679 | goto err_free_host_node; |
680 | } |
681 | |
682 | if (!of_device_is_compatible(device: port_node, "hdmi-connector" )) { |
683 | dev_err(lt->dev, "%s: Failed to get hdmi port\n" , __func__); |
684 | ret = -EINVAL; |
685 | goto err_free_host_node; |
686 | } |
687 | |
688 | of_node_put(node: port_node); |
689 | return 0; |
690 | |
691 | err_free_host_node: |
692 | of_node_put(node: port_node); |
693 | of_node_put(node: lt->host_node); |
694 | return ret; |
695 | } |
696 | |
697 | static int lt8912_put_dt(struct lt8912 *lt) |
698 | { |
699 | of_node_put(node: lt->host_node); |
700 | return 0; |
701 | } |
702 | |
703 | static int lt8912_probe(struct i2c_client *client) |
704 | { |
705 | static struct lt8912 *lt; |
706 | int ret = 0; |
707 | struct device *dev = &client->dev; |
708 | |
709 | lt = devm_kzalloc(dev, size: sizeof(struct lt8912), GFP_KERNEL); |
710 | if (!lt) |
711 | return -ENOMEM; |
712 | |
713 | lt->dev = dev; |
714 | lt->i2c_client[0] = client; |
715 | |
716 | ret = lt8912_parse_dt(lt); |
717 | if (ret) |
718 | goto err_dt_parse; |
719 | |
720 | ret = lt8912_init_i2c(lt, client); |
721 | if (ret) |
722 | goto err_i2c; |
723 | |
724 | i2c_set_clientdata(client, data: lt); |
725 | |
726 | lt->bridge.funcs = <8912_bridge_funcs; |
727 | lt->bridge.of_node = dev->of_node; |
728 | lt->bridge.ops = (DRM_BRIDGE_OP_EDID | |
729 | DRM_BRIDGE_OP_DETECT); |
730 | |
731 | drm_bridge_add(bridge: <->bridge); |
732 | |
733 | ret = lt8912_attach_dsi(lt); |
734 | if (ret) |
735 | goto err_attach; |
736 | |
737 | return 0; |
738 | |
739 | err_attach: |
740 | drm_bridge_remove(bridge: <->bridge); |
741 | lt8912_free_i2c(lt); |
742 | err_i2c: |
743 | lt8912_put_dt(lt); |
744 | err_dt_parse: |
745 | return ret; |
746 | } |
747 | |
748 | static void lt8912_remove(struct i2c_client *client) |
749 | { |
750 | struct lt8912 *lt = i2c_get_clientdata(client); |
751 | |
752 | drm_bridge_remove(bridge: <->bridge); |
753 | lt8912_free_i2c(lt); |
754 | lt8912_put_dt(lt); |
755 | } |
756 | |
757 | static const struct of_device_id lt8912_dt_match[] = { |
758 | {.compatible = "lontium,lt8912b" }, |
759 | {} |
760 | }; |
761 | MODULE_DEVICE_TABLE(of, lt8912_dt_match); |
762 | |
763 | static const struct i2c_device_id lt8912_id[] = { |
764 | {"lt8912" , 0}, |
765 | {}, |
766 | }; |
767 | MODULE_DEVICE_TABLE(i2c, lt8912_id); |
768 | |
769 | static struct i2c_driver lt8912_i2c_driver = { |
770 | .driver = { |
771 | .name = "lt8912" , |
772 | .of_match_table = lt8912_dt_match, |
773 | }, |
774 | .probe = lt8912_probe, |
775 | .remove = lt8912_remove, |
776 | .id_table = lt8912_id, |
777 | }; |
778 | module_i2c_driver(lt8912_i2c_driver); |
779 | |
780 | MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>" ); |
781 | MODULE_DESCRIPTION("lt8912 drm driver" ); |
782 | MODULE_LICENSE("GPL v2" ); |
783 | |