1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Driver for panels based on Sitronix ST7703 controller, souch as:
4 *
5 * - Rocktech jh057n00900 5.5" MIPI-DSI panel
6 *
7 * Copyright (C) Purism SPC 2019
8 */
9
10 #include <linux/debugfs.h>
11 #include <linux/delay.h>
12 #include <linux/gpio/consumer.h>
13 #include <linux/media-bus-format.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/regulator/consumer.h>
18
19 #include <video/display_timing.h>
20 #include <video/mipi_display.h>
21
22 #include <drm/drm_mipi_dsi.h>
23 #include <drm/drm_modes.h>
24 #include <drm/drm_panel.h>
25
26 #define DRV_NAME "panel-sitronix-st7703"
27
28 /* Manufacturer specific Commands send via DSI */
29 #define ST7703_CMD_ALL_PIXEL_OFF 0x22
30 #define ST7703_CMD_ALL_PIXEL_ON 0x23
31 #define ST7703_CMD_SETDISP 0xB2
32 #define ST7703_CMD_SETRGBIF 0xB3
33 #define ST7703_CMD_SETCYC 0xB4
34 #define ST7703_CMD_SETBGP 0xB5
35 #define ST7703_CMD_SETVCOM 0xB6
36 #define ST7703_CMD_SETOTP 0xB7
37 #define ST7703_CMD_SETPOWER_EXT 0xB8
38 #define ST7703_CMD_SETEXTC 0xB9
39 #define ST7703_CMD_SETMIPI 0xBA
40 #define ST7703_CMD_SETVDC 0xBC
41 #define ST7703_CMD_UNKNOWN_BF 0xBF
42 #define ST7703_CMD_SETSCR 0xC0
43 #define ST7703_CMD_SETPOWER 0xC1
44 #define ST7703_CMD_SETPANEL 0xCC
45 #define ST7703_CMD_UNKNOWN_C6 0xC6
46 #define ST7703_CMD_SETGAMMA 0xE0
47 #define ST7703_CMD_SETEQ 0xE3
48 #define ST7703_CMD_SETGIP1 0xE9
49 #define ST7703_CMD_SETGIP2 0xEA
50
51 struct st7703 {
52 struct device *dev;
53 struct drm_panel panel;
54 struct gpio_desc *reset_gpio;
55 struct regulator *vcc;
56 struct regulator *iovcc;
57 bool prepared;
58
59 struct dentry *debugfs;
60 const struct st7703_panel_desc *desc;
61 };
62
63 struct st7703_panel_desc {
64 const struct drm_display_mode *mode;
65 unsigned int lanes;
66 unsigned long mode_flags;
67 enum mipi_dsi_pixel_format format;
68 int (*init_sequence)(struct st7703 *ctx);
69 };
70
panel_to_st7703(struct drm_panel * panel)71 static inline struct st7703 *panel_to_st7703(struct drm_panel *panel)
72 {
73 return container_of(panel, struct st7703, panel);
74 }
75
76 #define dsi_generic_write_seq(dsi, seq...) do { \
77 static const u8 d[] = { seq }; \
78 int ret; \
79 ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d)); \
80 if (ret < 0) \
81 return ret; \
82 } while (0)
83
jh057n_init_sequence(struct st7703 * ctx)84 static int jh057n_init_sequence(struct st7703 *ctx)
85 {
86 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
87
88 /*
89 * Init sequence was supplied by the panel vendor. Most of the commands
90 * resemble the ST7703 but the number of parameters often don't match
91 * so it's likely a clone.
92 */
93 dsi_generic_write_seq(dsi, ST7703_CMD_SETEXTC,
94 0xF1, 0x12, 0x83);
95 dsi_generic_write_seq(dsi, ST7703_CMD_SETRGBIF,
96 0x10, 0x10, 0x05, 0x05, 0x03, 0xFF, 0x00, 0x00,
97 0x00, 0x00);
98 dsi_generic_write_seq(dsi, ST7703_CMD_SETSCR,
99 0x73, 0x73, 0x50, 0x50, 0x00, 0x00, 0x08, 0x70,
100 0x00);
101 dsi_generic_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);
102 dsi_generic_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);
103 dsi_generic_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
104 dsi_generic_write_seq(dsi, ST7703_CMD_SETDISP, 0xF0, 0x12, 0x30);
105 dsi_generic_write_seq(dsi, ST7703_CMD_SETEQ,
106 0x07, 0x07, 0x0B, 0x0B, 0x03, 0x0B, 0x00, 0x00,
107 0x00, 0x00, 0xFF, 0x00, 0xC0, 0x10);
108 dsi_generic_write_seq(dsi, ST7703_CMD_SETBGP, 0x08, 0x08);
109 msleep(20);
110
111 dsi_generic_write_seq(dsi, ST7703_CMD_SETVCOM, 0x3F, 0x3F);
112 dsi_generic_write_seq(dsi, ST7703_CMD_UNKNOWN_BF, 0x02, 0x11, 0x00);
113 dsi_generic_write_seq(dsi, ST7703_CMD_SETGIP1,
114 0x82, 0x10, 0x06, 0x05, 0x9E, 0x0A, 0xA5, 0x12,
115 0x31, 0x23, 0x37, 0x83, 0x04, 0xBC, 0x27, 0x38,
116 0x0C, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0C, 0x00,
117 0x03, 0x00, 0x00, 0x00, 0x75, 0x75, 0x31, 0x88,
118 0x88, 0x88, 0x88, 0x88, 0x88, 0x13, 0x88, 0x64,
119 0x64, 0x20, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
120 0x02, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
121 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
122 dsi_generic_write_seq(dsi, ST7703_CMD_SETGIP2,
123 0x02, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
124 0x00, 0x00, 0x00, 0x00, 0x02, 0x46, 0x02, 0x88,
125 0x88, 0x88, 0x88, 0x88, 0x88, 0x64, 0x88, 0x13,
126 0x57, 0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
127 0x75, 0x88, 0x23, 0x14, 0x00, 0x00, 0x02, 0x00,
128 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
129 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x0A,
130 0xA5, 0x00, 0x00, 0x00, 0x00);
131 dsi_generic_write_seq(dsi, ST7703_CMD_SETGAMMA,
132 0x00, 0x09, 0x0E, 0x29, 0x2D, 0x3C, 0x41, 0x37,
133 0x07, 0x0B, 0x0D, 0x10, 0x11, 0x0F, 0x10, 0x11,
134 0x18, 0x00, 0x09, 0x0E, 0x29, 0x2D, 0x3C, 0x41,
135 0x37, 0x07, 0x0B, 0x0D, 0x10, 0x11, 0x0F, 0x10,
136 0x11, 0x18);
137
138 return 0;
139 }
140
141 static const struct drm_display_mode jh057n00900_mode = {
142 .hdisplay = 720,
143 .hsync_start = 720 + 90,
144 .hsync_end = 720 + 90 + 20,
145 .htotal = 720 + 90 + 20 + 20,
146 .vdisplay = 1440,
147 .vsync_start = 1440 + 20,
148 .vsync_end = 1440 + 20 + 4,
149 .vtotal = 1440 + 20 + 4 + 12,
150 .clock = 75276,
151 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
152 .width_mm = 65,
153 .height_mm = 130,
154 };
155
156 static const struct st7703_panel_desc jh057n00900_panel_desc = {
157 .mode = &jh057n00900_mode,
158 .lanes = 4,
159 .mode_flags = MIPI_DSI_MODE_VIDEO |
160 MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
161 .format = MIPI_DSI_FMT_RGB888,
162 .init_sequence = jh057n_init_sequence,
163 };
164
165 #define dsi_dcs_write_seq(dsi, cmd, seq...) do { \
166 static const u8 d[] = { seq }; \
167 int ret; \
168 ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d)); \
169 if (ret < 0) \
170 return ret; \
171 } while (0)
172
173
xbd599_init_sequence(struct st7703 * ctx)174 static int xbd599_init_sequence(struct st7703 *ctx)
175 {
176 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
177
178 /*
179 * Init sequence was supplied by the panel vendor.
180 */
181
182 /* Magic sequence to unlock user commands below. */
183 dsi_dcs_write_seq(dsi, ST7703_CMD_SETEXTC, 0xF1, 0x12, 0x83);
184
185 dsi_dcs_write_seq(dsi, ST7703_CMD_SETMIPI,
186 0x33, /* VC_main = 0, Lane_Number = 3 (4 lanes) */
187 0x81, /* DSI_LDO_SEL = 1.7V, RTERM = 90 Ohm */
188 0x05, /* IHSRX = x6 (Low High Speed driving ability) */
189 0xF9, /* TX_CLK_SEL = fDSICLK/16 */
190 0x0E, /* HFP_OSC (min. HFP number in DSI mode) */
191 0x0E, /* HBP_OSC (min. HBP number in DSI mode) */
192 /* The rest is undocumented in ST7703 datasheet */
193 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
194 0x44, 0x25, 0x00, 0x91, 0x0a, 0x00, 0x00, 0x02,
195 0x4F, 0x11, 0x00, 0x00, 0x37);
196
197 dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT,
198 0x25, /* PCCS = 2, ECP_DC_DIV = 1/4 HSYNC */
199 0x22, /* DT = 15ms XDK_ECP = x2 */
200 0x20, /* PFM_DC_DIV = /1 */
201 0x03 /* ECP_SYNC_EN = 1, VGX_SYNC_EN = 1 */);
202
203 /* RGB I/F porch timing */
204 dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF,
205 0x10, /* VBP_RGB_GEN */
206 0x10, /* VFP_RGB_GEN */
207 0x05, /* DE_BP_RGB_GEN */
208 0x05, /* DE_FP_RGB_GEN */
209 /* The rest is undocumented in ST7703 datasheet */
210 0x03, 0xFF,
211 0x00, 0x00,
212 0x00, 0x00);
213
214 /* Source driving settings. */
215 dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR,
216 0x73, /* N_POPON */
217 0x73, /* N_NOPON */
218 0x50, /* I_POPON */
219 0x50, /* I_NOPON */
220 0x00, /* SCR[31,24] */
221 0xC0, /* SCR[23,16] */
222 0x08, /* SCR[15,8] */
223 0x70, /* SCR[7,0] */
224 0x00 /* Undocumented */);
225
226 /* NVDDD_SEL = -1.8V, VDDD_SEL = out of range (possibly 1.9V?) */
227 dsi_dcs_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);
228
229 /*
230 * SS_PANEL = 1 (reverse scan), GS_PANEL = 0 (normal scan)
231 * REV_PANEL = 1 (normally black panel), BGR_PANEL = 1 (BGR)
232 */
233 dsi_dcs_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);
234
235 /* Zig-Zag Type C column inversion. */
236 dsi_dcs_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
237
238 /* Set display resolution. */
239 dsi_dcs_write_seq(dsi, ST7703_CMD_SETDISP,
240 0xF0, /* NL = 240 */
241 0x12, /* RES_V_LSB = 0, BLK_CON = VSSD,
242 * RESO_SEL = 720RGB
243 */
244 0xF0 /* WHITE_GND_EN = 1 (GND),
245 * WHITE_FRAME_SEL = 7 frames,
246 * ISC = 0 frames
247 */);
248
249 dsi_dcs_write_seq(dsi, ST7703_CMD_SETEQ,
250 0x00, /* PNOEQ */
251 0x00, /* NNOEQ */
252 0x0B, /* PEQGND */
253 0x0B, /* NEQGND */
254 0x10, /* PEQVCI */
255 0x10, /* NEQVCI */
256 0x00, /* PEQVCI1 */
257 0x00, /* NEQVCI1 */
258 0x00, /* reserved */
259 0x00, /* reserved */
260 0xFF, /* reserved */
261 0x00, /* reserved */
262 0xC0, /* ESD_DET_DATA_WHITE = 1, ESD_WHITE_EN = 1 */
263 0x10 /* SLPIN_OPTION = 1 (no need vsync after sleep-in)
264 * VEDIO_NO_CHECK_EN = 0
265 * ESD_WHITE_GND_EN = 0
266 * ESD_DET_TIME_SEL = 0 frames
267 */);
268
269 /* Undocumented command. */
270 dsi_dcs_write_seq(dsi, ST7703_CMD_UNKNOWN_C6, 0x01, 0x00, 0xFF, 0xFF, 0x00);
271
272 dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER,
273 0x74, /* VBTHS, VBTLS: VGH = 17V, VBL = -11V */
274 0x00, /* FBOFF_VGH = 0, FBOFF_VGL = 0 */
275 0x32, /* VRP */
276 0x32, /* VRN */
277 0x77, /* reserved */
278 0xF1, /* APS = 1 (small),
279 * VGL_DET_EN = 1, VGH_DET_EN = 1,
280 * VGL_TURBO = 1, VGH_TURBO = 1
281 */
282 0xFF, /* VGH1_L_DIV, VGL1_L_DIV (1.5MHz) */
283 0xFF, /* VGH1_R_DIV, VGL1_R_DIV (1.5MHz) */
284 0xCC, /* VGH2_L_DIV, VGL2_L_DIV (2.6MHz) */
285 0xCC, /* VGH2_R_DIV, VGL2_R_DIV (2.6MHz) */
286 0x77, /* VGH3_L_DIV, VGL3_L_DIV (4.5MHz) */
287 0x77 /* VGH3_R_DIV, VGL3_R_DIV (4.5MHz) */);
288
289 /* Reference voltage. */
290 dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP,
291 0x07, /* VREF_SEL = 4.2V */
292 0x07 /* NVREF_SEL = 4.2V */);
293 msleep(20);
294
295 dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM,
296 0x2C, /* VCOMDC_F = -0.67V */
297 0x2C /* VCOMDC_B = -0.67V */);
298
299 /* Undocumented command. */
300 dsi_dcs_write_seq(dsi, ST7703_CMD_UNKNOWN_BF, 0x02, 0x11, 0x00);
301
302 /* This command is to set forward GIP timing. */
303 dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1,
304 0x82, 0x10, 0x06, 0x05, 0xA2, 0x0A, 0xA5, 0x12,
305 0x31, 0x23, 0x37, 0x83, 0x04, 0xBC, 0x27, 0x38,
306 0x0C, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0C, 0x00,
307 0x03, 0x00, 0x00, 0x00, 0x75, 0x75, 0x31, 0x88,
308 0x88, 0x88, 0x88, 0x88, 0x88, 0x13, 0x88, 0x64,
309 0x64, 0x20, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
310 0x02, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
311 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
312
313 /* This command is to set backward GIP timing. */
314 dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP2,
315 0x02, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
316 0x00, 0x00, 0x00, 0x00, 0x02, 0x46, 0x02, 0x88,
317 0x88, 0x88, 0x88, 0x88, 0x88, 0x64, 0x88, 0x13,
318 0x57, 0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
319 0x75, 0x88, 0x23, 0x14, 0x00, 0x00, 0x02, 0x00,
320 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
321 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x0A,
322 0xA5, 0x00, 0x00, 0x00, 0x00);
323
324 /* Adjust the gamma characteristics of the panel. */
325 dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA,
326 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41, 0x35,
327 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12, 0x12,
328 0x18, 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41,
329 0x35, 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12,
330 0x12, 0x18);
331
332 return 0;
333 }
334
335 static const struct drm_display_mode xbd599_mode = {
336 .hdisplay = 720,
337 .hsync_start = 720 + 40,
338 .hsync_end = 720 + 40 + 40,
339 .htotal = 720 + 40 + 40 + 40,
340 .vdisplay = 1440,
341 .vsync_start = 1440 + 18,
342 .vsync_end = 1440 + 18 + 10,
343 .vtotal = 1440 + 18 + 10 + 17,
344 .clock = 69000,
345 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
346 .width_mm = 68,
347 .height_mm = 136,
348 };
349
350 static const struct st7703_panel_desc xbd599_desc = {
351 .mode = &xbd599_mode,
352 .lanes = 4,
353 .mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE,
354 .format = MIPI_DSI_FMT_RGB888,
355 .init_sequence = xbd599_init_sequence,
356 };
357
st7703_enable(struct drm_panel * panel)358 static int st7703_enable(struct drm_panel *panel)
359 {
360 struct st7703 *ctx = panel_to_st7703(panel);
361 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
362 int ret;
363
364 ret = ctx->desc->init_sequence(ctx);
365 if (ret < 0) {
366 dev_err(ctx->dev, "Panel init sequence failed: %d\n", ret);
367 return ret;
368 }
369
370 msleep(20);
371
372 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
373 if (ret < 0) {
374 dev_err(ctx->dev, "Failed to exit sleep mode: %d\n", ret);
375 return ret;
376 }
377
378 /* Panel is operational 120 msec after reset */
379 msleep(60);
380
381 ret = mipi_dsi_dcs_set_display_on(dsi);
382 if (ret)
383 return ret;
384
385 dev_dbg(ctx->dev, "Panel init sequence done\n");
386
387 return 0;
388 }
389
st7703_disable(struct drm_panel * panel)390 static int st7703_disable(struct drm_panel *panel)
391 {
392 struct st7703 *ctx = panel_to_st7703(panel);
393 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
394 int ret;
395
396 ret = mipi_dsi_dcs_set_display_off(dsi);
397 if (ret < 0)
398 dev_err(ctx->dev, "Failed to turn off the display: %d\n", ret);
399
400 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
401 if (ret < 0)
402 dev_err(ctx->dev, "Failed to enter sleep mode: %d\n", ret);
403
404 return 0;
405 }
406
st7703_unprepare(struct drm_panel * panel)407 static int st7703_unprepare(struct drm_panel *panel)
408 {
409 struct st7703 *ctx = panel_to_st7703(panel);
410
411 if (!ctx->prepared)
412 return 0;
413
414 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
415 regulator_disable(ctx->iovcc);
416 regulator_disable(ctx->vcc);
417 ctx->prepared = false;
418
419 return 0;
420 }
421
st7703_prepare(struct drm_panel * panel)422 static int st7703_prepare(struct drm_panel *panel)
423 {
424 struct st7703 *ctx = panel_to_st7703(panel);
425 int ret;
426
427 if (ctx->prepared)
428 return 0;
429
430 dev_dbg(ctx->dev, "Resetting the panel\n");
431 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
432
433 ret = regulator_enable(ctx->iovcc);
434 if (ret < 0) {
435 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
436 return ret;
437 }
438
439 ret = regulator_enable(ctx->vcc);
440 if (ret < 0) {
441 dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
442 regulator_disable(ctx->iovcc);
443 return ret;
444 }
445
446 /* Give power supplies time to stabilize before deasserting reset. */
447 usleep_range(10000, 20000);
448
449 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
450 usleep_range(15000, 20000);
451
452 ctx->prepared = true;
453
454 return 0;
455 }
456
st7703_get_modes(struct drm_panel * panel,struct drm_connector * connector)457 static int st7703_get_modes(struct drm_panel *panel,
458 struct drm_connector *connector)
459 {
460 struct st7703 *ctx = panel_to_st7703(panel);
461 struct drm_display_mode *mode;
462
463 mode = drm_mode_duplicate(connector->dev, ctx->desc->mode);
464 if (!mode) {
465 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
466 ctx->desc->mode->hdisplay, ctx->desc->mode->vdisplay,
467 drm_mode_vrefresh(ctx->desc->mode));
468 return -ENOMEM;
469 }
470
471 drm_mode_set_name(mode);
472
473 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
474 connector->display_info.width_mm = mode->width_mm;
475 connector->display_info.height_mm = mode->height_mm;
476 drm_mode_probed_add(connector, mode);
477
478 return 1;
479 }
480
481 static const struct drm_panel_funcs st7703_drm_funcs = {
482 .disable = st7703_disable,
483 .unprepare = st7703_unprepare,
484 .prepare = st7703_prepare,
485 .enable = st7703_enable,
486 .get_modes = st7703_get_modes,
487 };
488
allpixelson_set(void * data,u64 val)489 static int allpixelson_set(void *data, u64 val)
490 {
491 struct st7703 *ctx = data;
492 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
493
494 dev_dbg(ctx->dev, "Setting all pixels on\n");
495 dsi_generic_write_seq(dsi, ST7703_CMD_ALL_PIXEL_ON);
496 msleep(val * 1000);
497 /* Reset the panel to get video back */
498 drm_panel_disable(&ctx->panel);
499 drm_panel_unprepare(&ctx->panel);
500 drm_panel_prepare(&ctx->panel);
501 drm_panel_enable(&ctx->panel);
502
503 return 0;
504 }
505
506 DEFINE_SIMPLE_ATTRIBUTE(allpixelson_fops, NULL,
507 allpixelson_set, "%llu\n");
508
st7703_debugfs_init(struct st7703 * ctx)509 static void st7703_debugfs_init(struct st7703 *ctx)
510 {
511 ctx->debugfs = debugfs_create_dir(DRV_NAME, NULL);
512
513 debugfs_create_file("allpixelson", 0600, ctx->debugfs, ctx,
514 &allpixelson_fops);
515 }
516
st7703_debugfs_remove(struct st7703 * ctx)517 static void st7703_debugfs_remove(struct st7703 *ctx)
518 {
519 debugfs_remove_recursive(ctx->debugfs);
520 ctx->debugfs = NULL;
521 }
522
st7703_probe(struct mipi_dsi_device * dsi)523 static int st7703_probe(struct mipi_dsi_device *dsi)
524 {
525 struct device *dev = &dsi->dev;
526 struct st7703 *ctx;
527 int ret;
528
529 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
530 if (!ctx)
531 return -ENOMEM;
532
533 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
534 if (IS_ERR(ctx->reset_gpio))
535 return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio), "Failed to get reset gpio\n");
536
537 mipi_dsi_set_drvdata(dsi, ctx);
538
539 ctx->dev = dev;
540 ctx->desc = of_device_get_match_data(dev);
541
542 dsi->mode_flags = ctx->desc->mode_flags;
543 dsi->format = ctx->desc->format;
544 dsi->lanes = ctx->desc->lanes;
545
546 ctx->vcc = devm_regulator_get(dev, "vcc");
547 if (IS_ERR(ctx->vcc))
548 return dev_err_probe(dev, PTR_ERR(ctx->vcc), "Failed to request vcc regulator\n");
549
550 ctx->iovcc = devm_regulator_get(dev, "iovcc");
551 if (IS_ERR(ctx->iovcc))
552 return dev_err_probe(dev, PTR_ERR(ctx->iovcc),
553 "Failed to request iovcc regulator\n");
554
555 drm_panel_init(&ctx->panel, dev, &st7703_drm_funcs,
556 DRM_MODE_CONNECTOR_DSI);
557
558 ret = drm_panel_of_backlight(&ctx->panel);
559 if (ret)
560 return ret;
561
562 drm_panel_add(&ctx->panel);
563
564 ret = mipi_dsi_attach(dsi);
565 if (ret < 0) {
566 dev_err(dev, "mipi_dsi_attach failed (%d). Is host ready?\n", ret);
567 drm_panel_remove(&ctx->panel);
568 return ret;
569 }
570
571 dev_info(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
572 ctx->desc->mode->hdisplay, ctx->desc->mode->vdisplay,
573 drm_mode_vrefresh(ctx->desc->mode),
574 mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
575
576 st7703_debugfs_init(ctx);
577 return 0;
578 }
579
st7703_shutdown(struct mipi_dsi_device * dsi)580 static void st7703_shutdown(struct mipi_dsi_device *dsi)
581 {
582 struct st7703 *ctx = mipi_dsi_get_drvdata(dsi);
583 int ret;
584
585 ret = drm_panel_unprepare(&ctx->panel);
586 if (ret < 0)
587 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
588
589 ret = drm_panel_disable(&ctx->panel);
590 if (ret < 0)
591 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
592 }
593
st7703_remove(struct mipi_dsi_device * dsi)594 static int st7703_remove(struct mipi_dsi_device *dsi)
595 {
596 struct st7703 *ctx = mipi_dsi_get_drvdata(dsi);
597 int ret;
598
599 st7703_shutdown(dsi);
600
601 ret = mipi_dsi_detach(dsi);
602 if (ret < 0)
603 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
604
605 drm_panel_remove(&ctx->panel);
606
607 st7703_debugfs_remove(ctx);
608
609 return 0;
610 }
611
612 static const struct of_device_id st7703_of_match[] = {
613 { .compatible = "rocktech,jh057n00900", .data = &jh057n00900_panel_desc },
614 { .compatible = "xingbangda,xbd599", .data = &xbd599_desc },
615 { /* sentinel */ }
616 };
617 MODULE_DEVICE_TABLE(of, st7703_of_match);
618
619 static struct mipi_dsi_driver st7703_driver = {
620 .probe = st7703_probe,
621 .remove = st7703_remove,
622 .shutdown = st7703_shutdown,
623 .driver = {
624 .name = DRV_NAME,
625 .of_match_table = st7703_of_match,
626 },
627 };
628 module_mipi_dsi_driver(st7703_driver);
629
630 MODULE_AUTHOR("Guido Günther <agx@sigxcpu.org>");
631 MODULE_DESCRIPTION("DRM driver for Sitronix ST7703 based MIPI DSI panels");
632 MODULE_LICENSE("GPL v2");
633