1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2016 InforceComputing
4 * Author: Vinay Simha BN <simhavcs@gmail.com>
5 *
6 * Copyright (C) 2016 Linaro Ltd
7 * Author: Sumit Semwal <sumit.semwal@linaro.org>
8 */
9
10 #include <linux/backlight.h>
11 #include <linux/delay.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/regulator/consumer.h>
16
17 #include <video/mipi_display.h>
18
19 #include <drm/drm_crtc.h>
20 #include <drm/drm_mipi_dsi.h>
21 #include <drm/drm_modes.h>
22 #include <drm/drm_panel.h>
23
24 static const char * const regulator_names[] = {
25 "vddp",
26 "iovcc"
27 };
28
29 struct jdi_panel {
30 struct drm_panel base;
31 struct mipi_dsi_device *dsi;
32
33 struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
34
35 struct gpio_desc *enable_gpio;
36 struct gpio_desc *reset_gpio;
37 struct gpio_desc *dcdc_en_gpio;
38 struct backlight_device *backlight;
39
40 const struct drm_display_mode *mode;
41 };
42
to_jdi_panel(struct drm_panel * panel)43 static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
44 {
45 return container_of(panel, struct jdi_panel, base);
46 }
47
jdi_panel_init(struct jdi_panel * jdi)48 static int jdi_panel_init(struct jdi_panel *jdi)
49 {
50 struct mipi_dsi_device *dsi = jdi->dsi;
51 struct device *dev = &jdi->dsi->dev;
52 int ret;
53
54 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
55
56 ret = mipi_dsi_dcs_soft_reset(dsi);
57 if (ret < 0)
58 return ret;
59
60 usleep_range(10000, 20000);
61
62 ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
63 if (ret < 0) {
64 dev_err(dev, "failed to set pixel format: %d\n", ret);
65 return ret;
66 }
67
68 ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
69 if (ret < 0) {
70 dev_err(dev, "failed to set column address: %d\n", ret);
71 return ret;
72 }
73
74 ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
75 if (ret < 0) {
76 dev_err(dev, "failed to set page address: %d\n", ret);
77 return ret;
78 }
79
80 /*
81 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
82 * are active
83 * BIT(3) BL = 1 Backlight Control On
84 * BIT(2) DD = 0 Display Dimming is Off
85 */
86 ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
87 (u8[]){ 0x24 }, 1);
88 if (ret < 0) {
89 dev_err(dev, "failed to write control display: %d\n", ret);
90 return ret;
91 }
92
93 /* CABC off */
94 ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
95 (u8[]){ 0x00 }, 1);
96 if (ret < 0) {
97 dev_err(dev, "failed to set cabc off: %d\n", ret);
98 return ret;
99 }
100
101 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
102 if (ret < 0) {
103 dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
104 return ret;
105 }
106
107 msleep(120);
108
109 ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
110 if (ret < 0) {
111 dev_err(dev, "failed to set mcap: %d\n", ret);
112 return ret;
113 }
114
115 mdelay(10);
116
117 /* Interface setting, video mode */
118 ret = mipi_dsi_generic_write(dsi, (u8[])
119 {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
120 if (ret < 0) {
121 dev_err(dev, "failed to set display interface setting: %d\n"
122 , ret);
123 return ret;
124 }
125
126 mdelay(20);
127
128 ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
129 if (ret < 0) {
130 dev_err(dev, "failed to set default values for mcap: %d\n"
131 , ret);
132 return ret;
133 }
134
135 return 0;
136 }
137
jdi_panel_on(struct jdi_panel * jdi)138 static int jdi_panel_on(struct jdi_panel *jdi)
139 {
140 struct mipi_dsi_device *dsi = jdi->dsi;
141 struct device *dev = &jdi->dsi->dev;
142 int ret;
143
144 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
145
146 ret = mipi_dsi_dcs_set_display_on(dsi);
147 if (ret < 0)
148 dev_err(dev, "failed to set display on: %d\n", ret);
149
150 return ret;
151 }
152
jdi_panel_off(struct jdi_panel * jdi)153 static void jdi_panel_off(struct jdi_panel *jdi)
154 {
155 struct mipi_dsi_device *dsi = jdi->dsi;
156 struct device *dev = &jdi->dsi->dev;
157 int ret;
158
159 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
160
161 ret = mipi_dsi_dcs_set_display_off(dsi);
162 if (ret < 0)
163 dev_err(dev, "failed to set display off: %d\n", ret);
164
165 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
166 if (ret < 0)
167 dev_err(dev, "failed to enter sleep mode: %d\n", ret);
168
169 msleep(100);
170 }
171
jdi_panel_disable(struct drm_panel * panel)172 static int jdi_panel_disable(struct drm_panel *panel)
173 {
174 struct jdi_panel *jdi = to_jdi_panel(panel);
175
176 backlight_disable(jdi->backlight);
177
178 return 0;
179 }
180
jdi_panel_unprepare(struct drm_panel * panel)181 static int jdi_panel_unprepare(struct drm_panel *panel)
182 {
183 struct jdi_panel *jdi = to_jdi_panel(panel);
184 struct device *dev = &jdi->dsi->dev;
185 int ret;
186
187 jdi_panel_off(jdi);
188
189 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
190 if (ret < 0)
191 dev_err(dev, "regulator disable failed, %d\n", ret);
192
193 gpiod_set_value(jdi->enable_gpio, 0);
194
195 gpiod_set_value(jdi->reset_gpio, 1);
196
197 gpiod_set_value(jdi->dcdc_en_gpio, 0);
198
199 return 0;
200 }
201
jdi_panel_prepare(struct drm_panel * panel)202 static int jdi_panel_prepare(struct drm_panel *panel)
203 {
204 struct jdi_panel *jdi = to_jdi_panel(panel);
205 struct device *dev = &jdi->dsi->dev;
206 int ret;
207
208 ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
209 if (ret < 0) {
210 dev_err(dev, "regulator enable failed, %d\n", ret);
211 return ret;
212 }
213
214 msleep(20);
215
216 gpiod_set_value(jdi->dcdc_en_gpio, 1);
217 usleep_range(10, 20);
218
219 gpiod_set_value(jdi->reset_gpio, 0);
220 usleep_range(10, 20);
221
222 gpiod_set_value(jdi->enable_gpio, 1);
223 usleep_range(10, 20);
224
225 ret = jdi_panel_init(jdi);
226 if (ret < 0) {
227 dev_err(dev, "failed to init panel: %d\n", ret);
228 goto poweroff;
229 }
230
231 ret = jdi_panel_on(jdi);
232 if (ret < 0) {
233 dev_err(dev, "failed to set panel on: %d\n", ret);
234 goto poweroff;
235 }
236
237 return 0;
238
239 poweroff:
240 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
241 if (ret < 0)
242 dev_err(dev, "regulator disable failed, %d\n", ret);
243
244 gpiod_set_value(jdi->enable_gpio, 0);
245
246 gpiod_set_value(jdi->reset_gpio, 1);
247
248 gpiod_set_value(jdi->dcdc_en_gpio, 0);
249
250 return ret;
251 }
252
jdi_panel_enable(struct drm_panel * panel)253 static int jdi_panel_enable(struct drm_panel *panel)
254 {
255 struct jdi_panel *jdi = to_jdi_panel(panel);
256
257 backlight_enable(jdi->backlight);
258
259 return 0;
260 }
261
262 static const struct drm_display_mode default_mode = {
263 .clock = 155493,
264 .hdisplay = 1200,
265 .hsync_start = 1200 + 48,
266 .hsync_end = 1200 + 48 + 32,
267 .htotal = 1200 + 48 + 32 + 60,
268 .vdisplay = 1920,
269 .vsync_start = 1920 + 3,
270 .vsync_end = 1920 + 3 + 5,
271 .vtotal = 1920 + 3 + 5 + 6,
272 .flags = 0,
273 };
274
jdi_panel_get_modes(struct drm_panel * panel,struct drm_connector * connector)275 static int jdi_panel_get_modes(struct drm_panel *panel,
276 struct drm_connector *connector)
277 {
278 struct drm_display_mode *mode;
279 struct jdi_panel *jdi = to_jdi_panel(panel);
280 struct device *dev = &jdi->dsi->dev;
281
282 mode = drm_mode_duplicate(connector->dev, &default_mode);
283 if (!mode) {
284 dev_err(dev, "failed to add mode %ux%ux@%u\n",
285 default_mode.hdisplay, default_mode.vdisplay,
286 drm_mode_vrefresh(&default_mode));
287 return -ENOMEM;
288 }
289
290 drm_mode_set_name(mode);
291
292 drm_mode_probed_add(connector, mode);
293
294 connector->display_info.width_mm = 95;
295 connector->display_info.height_mm = 151;
296
297 return 1;
298 }
299
dsi_dcs_bl_get_brightness(struct backlight_device * bl)300 static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
301 {
302 struct mipi_dsi_device *dsi = bl_get_data(bl);
303 int ret;
304 u16 brightness = bl->props.brightness;
305
306 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
307
308 ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
309 if (ret < 0)
310 return ret;
311
312 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
313
314 return brightness & 0xff;
315 }
316
dsi_dcs_bl_update_status(struct backlight_device * bl)317 static int dsi_dcs_bl_update_status(struct backlight_device *bl)
318 {
319 struct mipi_dsi_device *dsi = bl_get_data(bl);
320 int ret;
321
322 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
323
324 ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
325 if (ret < 0)
326 return ret;
327
328 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
329
330 return 0;
331 }
332
333 static const struct backlight_ops dsi_bl_ops = {
334 .update_status = dsi_dcs_bl_update_status,
335 .get_brightness = dsi_dcs_bl_get_brightness,
336 };
337
338 static struct backlight_device *
drm_panel_create_dsi_backlight(struct mipi_dsi_device * dsi)339 drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
340 {
341 struct device *dev = &dsi->dev;
342 struct backlight_properties props;
343
344 memset(&props, 0, sizeof(props));
345 props.type = BACKLIGHT_RAW;
346 props.brightness = 255;
347 props.max_brightness = 255;
348
349 return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
350 &dsi_bl_ops, &props);
351 }
352
353 static const struct drm_panel_funcs jdi_panel_funcs = {
354 .disable = jdi_panel_disable,
355 .unprepare = jdi_panel_unprepare,
356 .prepare = jdi_panel_prepare,
357 .enable = jdi_panel_enable,
358 .get_modes = jdi_panel_get_modes,
359 };
360
361 static const struct of_device_id jdi_of_match[] = {
362 { .compatible = "jdi,lt070me05000", },
363 { }
364 };
365 MODULE_DEVICE_TABLE(of, jdi_of_match);
366
jdi_panel_add(struct jdi_panel * jdi)367 static int jdi_panel_add(struct jdi_panel *jdi)
368 {
369 struct device *dev = &jdi->dsi->dev;
370 int ret;
371 unsigned int i;
372
373 jdi->mode = &default_mode;
374
375 for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
376 jdi->supplies[i].supply = regulator_names[i];
377
378 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
379 jdi->supplies);
380 if (ret < 0)
381 return dev_err_probe(dev, ret,
382 "failed to init regulator, ret=%d\n", ret);
383
384 jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
385 if (IS_ERR(jdi->enable_gpio)) {
386 return dev_err_probe(dev, PTR_ERR(jdi->enable_gpio),
387 "cannot get enable-gpio %d\n", ret);
388 }
389
390 jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
391 if (IS_ERR(jdi->reset_gpio))
392 return dev_err_probe(dev, PTR_ERR(jdi->reset_gpio),
393 "cannot get reset-gpios %d\n", ret);
394
395 jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
396 if (IS_ERR(jdi->dcdc_en_gpio))
397 return dev_err_probe(dev, PTR_ERR(jdi->dcdc_en_gpio),
398 "cannot get dcdc-en-gpio %d\n", ret);
399
400 jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
401 if (IS_ERR(jdi->backlight))
402 return dev_err_probe(dev, PTR_ERR(jdi->backlight),
403 "failed to register backlight %d\n", ret);
404
405 drm_panel_init(&jdi->base, &jdi->dsi->dev, &jdi_panel_funcs,
406 DRM_MODE_CONNECTOR_DSI);
407
408 drm_panel_add(&jdi->base);
409
410 return 0;
411 }
412
jdi_panel_del(struct jdi_panel * jdi)413 static void jdi_panel_del(struct jdi_panel *jdi)
414 {
415 if (jdi->base.dev)
416 drm_panel_remove(&jdi->base);
417 }
418
jdi_panel_probe(struct mipi_dsi_device * dsi)419 static int jdi_panel_probe(struct mipi_dsi_device *dsi)
420 {
421 struct jdi_panel *jdi;
422 int ret;
423
424 dsi->lanes = 4;
425 dsi->format = MIPI_DSI_FMT_RGB888;
426 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
427 MIPI_DSI_CLOCK_NON_CONTINUOUS;
428
429 jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
430 if (!jdi)
431 return -ENOMEM;
432
433 mipi_dsi_set_drvdata(dsi, jdi);
434
435 jdi->dsi = dsi;
436
437 ret = jdi_panel_add(jdi);
438 if (ret < 0)
439 return ret;
440
441 ret = mipi_dsi_attach(dsi);
442 if (ret < 0) {
443 jdi_panel_del(jdi);
444 return ret;
445 }
446
447 return 0;
448 }
449
jdi_panel_remove(struct mipi_dsi_device * dsi)450 static void jdi_panel_remove(struct mipi_dsi_device *dsi)
451 {
452 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
453 int ret;
454
455 ret = mipi_dsi_detach(dsi);
456 if (ret < 0)
457 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
458 ret);
459
460 jdi_panel_del(jdi);
461 }
462
463 static struct mipi_dsi_driver jdi_panel_driver = {
464 .driver = {
465 .name = "panel-jdi-lt070me05000",
466 .of_match_table = jdi_of_match,
467 },
468 .probe = jdi_panel_probe,
469 .remove = jdi_panel_remove,
470 };
471 module_mipi_dsi_driver(jdi_panel_driver);
472
473 MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
474 MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
475 MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
476 MODULE_LICENSE("GPL v2");
477