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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2017-2018, Bootlin
4 */
5
6#include <linux/delay.h>
7#include <linux/device.h>
8#include <linux/err.h>
9#include <linux/errno.h>
10#include <linux/fb.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13
14#include <linux/gpio/consumer.h>
15#include <linux/regulator/consumer.h>
16
17#include <drm/drm_mipi_dsi.h>
18#include <drm/drm_modes.h>
19#include <drm/drm_panel.h>
20
21#include <video/mipi_display.h>
22
23struct ili9881c {
24 struct drm_panel panel;
25 struct mipi_dsi_device *dsi;
26
27 struct regulator *power;
28 struct gpio_desc *reset;
29};
30
31enum ili9881c_op {
32 ILI9881C_SWITCH_PAGE,
33 ILI9881C_COMMAND,
34};
35
36struct ili9881c_instr {
37 enum ili9881c_op op;
38
39 union arg {
40 struct cmd {
41 u8 cmd;
42 u8 data;
43 } cmd;
44 u8 page;
45 } arg;
46};
47
48#define ILI9881C_SWITCH_PAGE_INSTR(_page) \
49 { \
50 .op = ILI9881C_SWITCH_PAGE, \
51 .arg = { \
52 .page = (_page), \
53 }, \
54 }
55
56#define ILI9881C_COMMAND_INSTR(_cmd, _data) \
57 { \
58 .op = ILI9881C_COMMAND, \
59 .arg = { \
60 .cmd = { \
61 .cmd = (_cmd), \
62 .data = (_data), \
63 }, \
64 }, \
65 }
66
67static const struct ili9881c_instr ili9881c_init[] = {
68 ILI9881C_SWITCH_PAGE_INSTR(3),
69 ILI9881C_COMMAND_INSTR(0x01, 0x00),
70 ILI9881C_COMMAND_INSTR(0x02, 0x00),
71 ILI9881C_COMMAND_INSTR(0x03, 0x73),
72 ILI9881C_COMMAND_INSTR(0x04, 0x03),
73 ILI9881C_COMMAND_INSTR(0x05, 0x00),
74 ILI9881C_COMMAND_INSTR(0x06, 0x06),
75 ILI9881C_COMMAND_INSTR(0x07, 0x06),
76 ILI9881C_COMMAND_INSTR(0x08, 0x00),
77 ILI9881C_COMMAND_INSTR(0x09, 0x18),
78 ILI9881C_COMMAND_INSTR(0x0a, 0x04),
79 ILI9881C_COMMAND_INSTR(0x0b, 0x00),
80 ILI9881C_COMMAND_INSTR(0x0c, 0x02),
81 ILI9881C_COMMAND_INSTR(0x0d, 0x03),
82 ILI9881C_COMMAND_INSTR(0x0e, 0x00),
83 ILI9881C_COMMAND_INSTR(0x0f, 0x25),
84 ILI9881C_COMMAND_INSTR(0x10, 0x25),
85 ILI9881C_COMMAND_INSTR(0x11, 0x00),
86 ILI9881C_COMMAND_INSTR(0x12, 0x00),
87 ILI9881C_COMMAND_INSTR(0x13, 0x00),
88 ILI9881C_COMMAND_INSTR(0x14, 0x00),
89 ILI9881C_COMMAND_INSTR(0x15, 0x00),
90 ILI9881C_COMMAND_INSTR(0x16, 0x0C),
91 ILI9881C_COMMAND_INSTR(0x17, 0x00),
92 ILI9881C_COMMAND_INSTR(0x18, 0x00),
93 ILI9881C_COMMAND_INSTR(0x19, 0x00),
94 ILI9881C_COMMAND_INSTR(0x1a, 0x00),
95 ILI9881C_COMMAND_INSTR(0x1b, 0x00),
96 ILI9881C_COMMAND_INSTR(0x1c, 0x00),
97 ILI9881C_COMMAND_INSTR(0x1d, 0x00),
98 ILI9881C_COMMAND_INSTR(0x1e, 0xC0),
99 ILI9881C_COMMAND_INSTR(0x1f, 0x80),
100 ILI9881C_COMMAND_INSTR(0x20, 0x04),
101 ILI9881C_COMMAND_INSTR(0x21, 0x01),
102 ILI9881C_COMMAND_INSTR(0x22, 0x00),
103 ILI9881C_COMMAND_INSTR(0x23, 0x00),
104 ILI9881C_COMMAND_INSTR(0x24, 0x00),
105 ILI9881C_COMMAND_INSTR(0x25, 0x00),
106 ILI9881C_COMMAND_INSTR(0x26, 0x00),
107 ILI9881C_COMMAND_INSTR(0x27, 0x00),
108 ILI9881C_COMMAND_INSTR(0x28, 0x33),
109 ILI9881C_COMMAND_INSTR(0x29, 0x03),
110 ILI9881C_COMMAND_INSTR(0x2a, 0x00),
111 ILI9881C_COMMAND_INSTR(0x2b, 0x00),
112 ILI9881C_COMMAND_INSTR(0x2c, 0x00),
113 ILI9881C_COMMAND_INSTR(0x2d, 0x00),
114 ILI9881C_COMMAND_INSTR(0x2e, 0x00),
115 ILI9881C_COMMAND_INSTR(0x2f, 0x00),
116 ILI9881C_COMMAND_INSTR(0x30, 0x00),
117 ILI9881C_COMMAND_INSTR(0x31, 0x00),
118 ILI9881C_COMMAND_INSTR(0x32, 0x00),
119 ILI9881C_COMMAND_INSTR(0x33, 0x00),
120 ILI9881C_COMMAND_INSTR(0x34, 0x04),
121 ILI9881C_COMMAND_INSTR(0x35, 0x00),
122 ILI9881C_COMMAND_INSTR(0x36, 0x00),
123 ILI9881C_COMMAND_INSTR(0x37, 0x00),
124 ILI9881C_COMMAND_INSTR(0x38, 0x3C),
125 ILI9881C_COMMAND_INSTR(0x39, 0x00),
126 ILI9881C_COMMAND_INSTR(0x3a, 0x00),
127 ILI9881C_COMMAND_INSTR(0x3b, 0x00),
128 ILI9881C_COMMAND_INSTR(0x3c, 0x00),
129 ILI9881C_COMMAND_INSTR(0x3d, 0x00),
130 ILI9881C_COMMAND_INSTR(0x3e, 0x00),
131 ILI9881C_COMMAND_INSTR(0x3f, 0x00),
132 ILI9881C_COMMAND_INSTR(0x40, 0x00),
133 ILI9881C_COMMAND_INSTR(0x41, 0x00),
134 ILI9881C_COMMAND_INSTR(0x42, 0x00),
135 ILI9881C_COMMAND_INSTR(0x43, 0x00),
136 ILI9881C_COMMAND_INSTR(0x44, 0x00),
137 ILI9881C_COMMAND_INSTR(0x50, 0x01),
138 ILI9881C_COMMAND_INSTR(0x51, 0x23),
139 ILI9881C_COMMAND_INSTR(0x52, 0x45),
140 ILI9881C_COMMAND_INSTR(0x53, 0x67),
141 ILI9881C_COMMAND_INSTR(0x54, 0x89),
142 ILI9881C_COMMAND_INSTR(0x55, 0xab),
143 ILI9881C_COMMAND_INSTR(0x56, 0x01),
144 ILI9881C_COMMAND_INSTR(0x57, 0x23),
145 ILI9881C_COMMAND_INSTR(0x58, 0x45),
146 ILI9881C_COMMAND_INSTR(0x59, 0x67),
147 ILI9881C_COMMAND_INSTR(0x5a, 0x89),
148 ILI9881C_COMMAND_INSTR(0x5b, 0xab),
149 ILI9881C_COMMAND_INSTR(0x5c, 0xcd),
150 ILI9881C_COMMAND_INSTR(0x5d, 0xef),
151 ILI9881C_COMMAND_INSTR(0x5e, 0x11),
152 ILI9881C_COMMAND_INSTR(0x5f, 0x02),
153 ILI9881C_COMMAND_INSTR(0x60, 0x02),
154 ILI9881C_COMMAND_INSTR(0x61, 0x02),
155 ILI9881C_COMMAND_INSTR(0x62, 0x02),
156 ILI9881C_COMMAND_INSTR(0x63, 0x02),
157 ILI9881C_COMMAND_INSTR(0x64, 0x02),
158 ILI9881C_COMMAND_INSTR(0x65, 0x02),
159 ILI9881C_COMMAND_INSTR(0x66, 0x02),
160 ILI9881C_COMMAND_INSTR(0x67, 0x02),
161 ILI9881C_COMMAND_INSTR(0x68, 0x02),
162 ILI9881C_COMMAND_INSTR(0x69, 0x02),
163 ILI9881C_COMMAND_INSTR(0x6a, 0x0C),
164 ILI9881C_COMMAND_INSTR(0x6b, 0x02),
165 ILI9881C_COMMAND_INSTR(0x6c, 0x0F),
166 ILI9881C_COMMAND_INSTR(0x6d, 0x0E),
167 ILI9881C_COMMAND_INSTR(0x6e, 0x0D),
168 ILI9881C_COMMAND_INSTR(0x6f, 0x06),
169 ILI9881C_COMMAND_INSTR(0x70, 0x07),
170 ILI9881C_COMMAND_INSTR(0x71, 0x02),
171 ILI9881C_COMMAND_INSTR(0x72, 0x02),
172 ILI9881C_COMMAND_INSTR(0x73, 0x02),
173 ILI9881C_COMMAND_INSTR(0x74, 0x02),
174 ILI9881C_COMMAND_INSTR(0x75, 0x02),
175 ILI9881C_COMMAND_INSTR(0x76, 0x02),
176 ILI9881C_COMMAND_INSTR(0x77, 0x02),
177 ILI9881C_COMMAND_INSTR(0x78, 0x02),
178 ILI9881C_COMMAND_INSTR(0x79, 0x02),
179 ILI9881C_COMMAND_INSTR(0x7a, 0x02),
180 ILI9881C_COMMAND_INSTR(0x7b, 0x02),
181 ILI9881C_COMMAND_INSTR(0x7c, 0x02),
182 ILI9881C_COMMAND_INSTR(0x7d, 0x02),
183 ILI9881C_COMMAND_INSTR(0x7e, 0x02),
184 ILI9881C_COMMAND_INSTR(0x7f, 0x02),
185 ILI9881C_COMMAND_INSTR(0x80, 0x0C),
186 ILI9881C_COMMAND_INSTR(0x81, 0x02),
187 ILI9881C_COMMAND_INSTR(0x82, 0x0F),
188 ILI9881C_COMMAND_INSTR(0x83, 0x0E),
189 ILI9881C_COMMAND_INSTR(0x84, 0x0D),
190 ILI9881C_COMMAND_INSTR(0x85, 0x06),
191 ILI9881C_COMMAND_INSTR(0x86, 0x07),
192 ILI9881C_COMMAND_INSTR(0x87, 0x02),
193 ILI9881C_COMMAND_INSTR(0x88, 0x02),
194 ILI9881C_COMMAND_INSTR(0x89, 0x02),
195 ILI9881C_COMMAND_INSTR(0x8A, 0x02),
196 ILI9881C_SWITCH_PAGE_INSTR(4),
197 ILI9881C_COMMAND_INSTR(0x6C, 0x15),
198 ILI9881C_COMMAND_INSTR(0x6E, 0x22),
199 ILI9881C_COMMAND_INSTR(0x6F, 0x33),
200 ILI9881C_COMMAND_INSTR(0x3A, 0xA4),
201 ILI9881C_COMMAND_INSTR(0x8D, 0x0D),
202 ILI9881C_COMMAND_INSTR(0x87, 0xBA),
203 ILI9881C_COMMAND_INSTR(0x26, 0x76),
204 ILI9881C_COMMAND_INSTR(0xB2, 0xD1),
205 ILI9881C_SWITCH_PAGE_INSTR(1),
206 ILI9881C_COMMAND_INSTR(0x22, 0x0A),
207 ILI9881C_COMMAND_INSTR(0x53, 0xDC),
208 ILI9881C_COMMAND_INSTR(0x55, 0xA7),
209 ILI9881C_COMMAND_INSTR(0x50, 0x78),
210 ILI9881C_COMMAND_INSTR(0x51, 0x78),
211 ILI9881C_COMMAND_INSTR(0x31, 0x02),
212 ILI9881C_COMMAND_INSTR(0x60, 0x14),
213 ILI9881C_COMMAND_INSTR(0xA0, 0x2A),
214 ILI9881C_COMMAND_INSTR(0xA1, 0x39),
215 ILI9881C_COMMAND_INSTR(0xA2, 0x46),
216 ILI9881C_COMMAND_INSTR(0xA3, 0x0e),
217 ILI9881C_COMMAND_INSTR(0xA4, 0x12),
218 ILI9881C_COMMAND_INSTR(0xA5, 0x25),
219 ILI9881C_COMMAND_INSTR(0xA6, 0x19),
220 ILI9881C_COMMAND_INSTR(0xA7, 0x1d),
221 ILI9881C_COMMAND_INSTR(0xA8, 0xa6),
222 ILI9881C_COMMAND_INSTR(0xA9, 0x1C),
223 ILI9881C_COMMAND_INSTR(0xAA, 0x29),
224 ILI9881C_COMMAND_INSTR(0xAB, 0x85),
225 ILI9881C_COMMAND_INSTR(0xAC, 0x1C),
226 ILI9881C_COMMAND_INSTR(0xAD, 0x1B),
227 ILI9881C_COMMAND_INSTR(0xAE, 0x51),
228 ILI9881C_COMMAND_INSTR(0xAF, 0x22),
229 ILI9881C_COMMAND_INSTR(0xB0, 0x2d),
230 ILI9881C_COMMAND_INSTR(0xB1, 0x4f),
231 ILI9881C_COMMAND_INSTR(0xB2, 0x59),
232 ILI9881C_COMMAND_INSTR(0xB3, 0x3F),
233 ILI9881C_COMMAND_INSTR(0xC0, 0x2A),
234 ILI9881C_COMMAND_INSTR(0xC1, 0x3a),
235 ILI9881C_COMMAND_INSTR(0xC2, 0x45),
236 ILI9881C_COMMAND_INSTR(0xC3, 0x0e),
237 ILI9881C_COMMAND_INSTR(0xC4, 0x11),
238 ILI9881C_COMMAND_INSTR(0xC5, 0x24),
239 ILI9881C_COMMAND_INSTR(0xC6, 0x1a),
240 ILI9881C_COMMAND_INSTR(0xC7, 0x1c),
241 ILI9881C_COMMAND_INSTR(0xC8, 0xaa),
242 ILI9881C_COMMAND_INSTR(0xC9, 0x1C),
243 ILI9881C_COMMAND_INSTR(0xCA, 0x29),
244 ILI9881C_COMMAND_INSTR(0xCB, 0x96),
245 ILI9881C_COMMAND_INSTR(0xCC, 0x1C),
246 ILI9881C_COMMAND_INSTR(0xCD, 0x1B),
247 ILI9881C_COMMAND_INSTR(0xCE, 0x51),
248 ILI9881C_COMMAND_INSTR(0xCF, 0x22),
249 ILI9881C_COMMAND_INSTR(0xD0, 0x2b),
250 ILI9881C_COMMAND_INSTR(0xD1, 0x4b),
251 ILI9881C_COMMAND_INSTR(0xD2, 0x59),
252 ILI9881C_COMMAND_INSTR(0xD3, 0x3F),
253};
254
255static inline struct ili9881c *panel_to_ili9881c(struct drm_panel *panel)
256{
257 return container_of(panel, struct ili9881c, panel);
258}
259
260/*
261 * The panel seems to accept some private DCS commands that map
262 * directly to registers.
263 *
264 * It is organised by page, with each page having its own set of
265 * registers, and the first page looks like it's holding the standard
266 * DCS commands.
267 *
268 * So before any attempt at sending a command or data, we have to be
269 * sure if we're in the right page or not.
270 */
271static int ili9881c_switch_page(struct ili9881c *ctx, u8 page)
272{
273 u8 buf[4] = { 0xff, 0x98, 0x81, page };
274 int ret;
275
276 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
277 if (ret < 0)
278 return ret;
279
280 return 0;
281}
282
283static int ili9881c_send_cmd_data(struct ili9881c *ctx, u8 cmd, u8 data)
284{
285 u8 buf[2] = { cmd, data };
286 int ret;
287
288 ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
289 if (ret < 0)
290 return ret;
291
292 return 0;
293}
294
295static int ili9881c_prepare(struct drm_panel *panel)
296{
297 struct ili9881c *ctx = panel_to_ili9881c(panel);
298 unsigned int i;
299 int ret;
300
301 /* Power the panel */
302 ret = regulator_enable(ctx->power);
303 if (ret)
304 return ret;
305 msleep(5);
306
307 /* And reset it */
308 gpiod_set_value(ctx->reset, 1);
309 msleep(20);
310
311 gpiod_set_value(ctx->reset, 0);
312 msleep(20);
313
314 for (i = 0; i < ARRAY_SIZE(ili9881c_init); i++) {
315 const struct ili9881c_instr *instr = &ili9881c_init[i];
316
317 if (instr->op == ILI9881C_SWITCH_PAGE)
318 ret = ili9881c_switch_page(ctx, instr->arg.page);
319 else if (instr->op == ILI9881C_COMMAND)
320 ret = ili9881c_send_cmd_data(ctx, instr->arg.cmd.cmd,
321 instr->arg.cmd.data);
322
323 if (ret)
324 return ret;
325 }
326
327 ret = ili9881c_switch_page(ctx, 0);
328 if (ret)
329 return ret;
330
331 ret = mipi_dsi_dcs_set_tear_on(ctx->dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
332 if (ret)
333 return ret;
334
335 ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
336 if (ret)
337 return ret;
338
339 return 0;
340}
341
342static int ili9881c_enable(struct drm_panel *panel)
343{
344 struct ili9881c *ctx = panel_to_ili9881c(panel);
345
346 msleep(120);
347
348 mipi_dsi_dcs_set_display_on(ctx->dsi);
349
350 return 0;
351}
352
353static int ili9881c_disable(struct drm_panel *panel)
354{
355 struct ili9881c *ctx = panel_to_ili9881c(panel);
356
357 return mipi_dsi_dcs_set_display_off(ctx->dsi);
358}
359
360static int ili9881c_unprepare(struct drm_panel *panel)
361{
362 struct ili9881c *ctx = panel_to_ili9881c(panel);
363
364 mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
365 regulator_disable(ctx->power);
366 gpiod_set_value(ctx->reset, 1);
367
368 return 0;
369}
370
371static const struct drm_display_mode bananapi_default_mode = {
372 .clock = 62000,
373
374 .hdisplay = 720,
375 .hsync_start = 720 + 10,
376 .hsync_end = 720 + 10 + 20,
377 .htotal = 720 + 10 + 20 + 30,
378
379 .vdisplay = 1280,
380 .vsync_start = 1280 + 10,
381 .vsync_end = 1280 + 10 + 10,
382 .vtotal = 1280 + 10 + 10 + 20,
383};
384
385static int ili9881c_get_modes(struct drm_panel *panel,
386 struct drm_connector *connector)
387{
388 struct ili9881c *ctx = panel_to_ili9881c(panel);
389 struct drm_display_mode *mode;
390
391 mode = drm_mode_duplicate(connector->dev, &bananapi_default_mode);
392 if (!mode) {
393 dev_err(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n",
394 bananapi_default_mode.hdisplay,
395 bananapi_default_mode.vdisplay,
396 drm_mode_vrefresh(&bananapi_default_mode));
397 return -ENOMEM;
398 }
399
400 drm_mode_set_name(mode);
401
402 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
403 drm_mode_probed_add(connector, mode);
404
405 connector->display_info.width_mm = 62;
406 connector->display_info.height_mm = 110;
407
408 return 1;
409}
410
411static const struct drm_panel_funcs ili9881c_funcs = {
412 .prepare = ili9881c_prepare,
413 .unprepare = ili9881c_unprepare,
414 .enable = ili9881c_enable,
415 .disable = ili9881c_disable,
416 .get_modes = ili9881c_get_modes,
417};
418
419static int ili9881c_dsi_probe(struct mipi_dsi_device *dsi)
420{
421 struct ili9881c *ctx;
422 int ret;
423
424 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
425 if (!ctx)
426 return -ENOMEM;
427 mipi_dsi_set_drvdata(dsi, ctx);
428 ctx->dsi = dsi;
429
430 drm_panel_init(&ctx->panel, &dsi->dev, &ili9881c_funcs,
431 DRM_MODE_CONNECTOR_DSI);
432
433 ctx->power = devm_regulator_get(&dsi->dev, "power");
434 if (IS_ERR(ctx->power)) {
435 dev_err(&dsi->dev, "Couldn't get our power regulator\n");
436 return PTR_ERR(ctx->power);
437 }
438
439 ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
440 if (IS_ERR(ctx->reset)) {
441 dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
442 return PTR_ERR(ctx->reset);
443 }
444
445 ret = drm_panel_of_backlight(&ctx->panel);
446 if (ret)
447 return ret;
448
449 ret = drm_panel_add(&ctx->panel);
450 if (ret < 0)
451 return ret;
452
453 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
454 dsi->format = MIPI_DSI_FMT_RGB888;
455 dsi->lanes = 4;
456
457 return mipi_dsi_attach(dsi);
458}
459
460static int ili9881c_dsi_remove(struct mipi_dsi_device *dsi)
461{
462 struct ili9881c *ctx = mipi_dsi_get_drvdata(dsi);
463
464 mipi_dsi_detach(dsi);
465 drm_panel_remove(&ctx->panel);
466
467 return 0;
468}
469
470static const struct of_device_id ili9881c_of_match[] = {
471 { .compatible = "bananapi,lhr050h41" },
472 { }
473};
474MODULE_DEVICE_TABLE(of, ili9881c_of_match);
475
476static struct mipi_dsi_driver ili9881c_dsi_driver = {
477 .probe = ili9881c_dsi_probe,
478 .remove = ili9881c_dsi_remove,
479 .driver = {
480 .name = "ili9881c-dsi",
481 .of_match_table = ili9881c_of_match,
482 },
483};
484module_mipi_dsi_driver(ili9881c_dsi_driver);
485
486MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
487MODULE_DESCRIPTION("Ilitek ILI9881C Controller Driver");
488MODULE_LICENSE("GPL v2");