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 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 ret = regulator_enable(ctx->vcc);
432 if (ret < 0) {
433 dev_err(ctx->dev, "Failed to enable vcc supply: %d\n", ret);
434 return ret;
435 }
436 ret = regulator_enable(ctx->iovcc);
437 if (ret < 0) {
438 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
439 goto disable_vcc;
440 }
441
442 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
443 usleep_range(20, 40);
444 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
445 msleep(20);
446
447 ctx->prepared = true;
448
449 return 0;
450
451 disable_vcc:
452 regulator_disable(ctx->vcc);
453 return ret;
454 }
455
st7703_get_modes(struct drm_panel * panel,struct drm_connector * connector)456 static int st7703_get_modes(struct drm_panel *panel,
457 struct drm_connector *connector)
458 {
459 struct st7703 *ctx = panel_to_st7703(panel);
460 struct drm_display_mode *mode;
461
462 mode = drm_mode_duplicate(connector->dev, ctx->desc->mode);
463 if (!mode) {
464 dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
465 ctx->desc->mode->hdisplay, ctx->desc->mode->vdisplay,
466 drm_mode_vrefresh(ctx->desc->mode));
467 return -ENOMEM;
468 }
469
470 drm_mode_set_name(mode);
471
472 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
473 connector->display_info.width_mm = mode->width_mm;
474 connector->display_info.height_mm = mode->height_mm;
475 drm_mode_probed_add(connector, mode);
476
477 return 1;
478 }
479
480 static const struct drm_panel_funcs st7703_drm_funcs = {
481 .disable = st7703_disable,
482 .unprepare = st7703_unprepare,
483 .prepare = st7703_prepare,
484 .enable = st7703_enable,
485 .get_modes = st7703_get_modes,
486 };
487
allpixelson_set(void * data,u64 val)488 static int allpixelson_set(void *data, u64 val)
489 {
490 struct st7703 *ctx = data;
491 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
492
493 dev_dbg(ctx->dev, "Setting all pixels on\n");
494 dsi_generic_write_seq(dsi, ST7703_CMD_ALL_PIXEL_ON);
495 msleep(val * 1000);
496 /* Reset the panel to get video back */
497 drm_panel_disable(&ctx->panel);
498 drm_panel_unprepare(&ctx->panel);
499 drm_panel_prepare(&ctx->panel);
500 drm_panel_enable(&ctx->panel);
501
502 return 0;
503 }
504
505 DEFINE_SIMPLE_ATTRIBUTE(allpixelson_fops, NULL,
506 allpixelson_set, "%llu\n");
507
st7703_debugfs_init(struct st7703 * ctx)508 static void st7703_debugfs_init(struct st7703 *ctx)
509 {
510 ctx->debugfs = debugfs_create_dir(DRV_NAME, NULL);
511
512 debugfs_create_file("allpixelson", 0600, ctx->debugfs, ctx,
513 &allpixelson_fops);
514 }
515
st7703_debugfs_remove(struct st7703 * ctx)516 static void st7703_debugfs_remove(struct st7703 *ctx)
517 {
518 debugfs_remove_recursive(ctx->debugfs);
519 ctx->debugfs = NULL;
520 }
521
st7703_probe(struct mipi_dsi_device * dsi)522 static int st7703_probe(struct mipi_dsi_device *dsi)
523 {
524 struct device *dev = &dsi->dev;
525 struct st7703 *ctx;
526 int ret;
527
528 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
529 if (!ctx)
530 return -ENOMEM;
531
532 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
533 if (IS_ERR(ctx->reset_gpio)) {
534 dev_err(dev, "cannot get reset gpio\n");
535 return PTR_ERR(ctx->reset_gpio);
536 }
537
538 mipi_dsi_set_drvdata(dsi, ctx);
539
540 ctx->dev = dev;
541 ctx->desc = of_device_get_match_data(dev);
542
543 dsi->mode_flags = ctx->desc->mode_flags;
544 dsi->format = ctx->desc->format;
545 dsi->lanes = ctx->desc->lanes;
546
547 ctx->vcc = devm_regulator_get(dev, "vcc");
548 if (IS_ERR(ctx->vcc)) {
549 ret = PTR_ERR(ctx->vcc);
550 if (ret != -EPROBE_DEFER)
551 dev_err(dev, "Failed to request vcc regulator: %d\n", ret);
552 return ret;
553 }
554 ctx->iovcc = devm_regulator_get(dev, "iovcc");
555 if (IS_ERR(ctx->iovcc)) {
556 ret = PTR_ERR(ctx->iovcc);
557 if (ret != -EPROBE_DEFER)
558 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
559 return ret;
560 }
561
562 drm_panel_init(&ctx->panel, dev, &st7703_drm_funcs,
563 DRM_MODE_CONNECTOR_DSI);
564
565 ret = drm_panel_of_backlight(&ctx->panel);
566 if (ret)
567 return ret;
568
569 drm_panel_add(&ctx->panel);
570
571 ret = mipi_dsi_attach(dsi);
572 if (ret < 0) {
573 dev_err(dev, "mipi_dsi_attach failed (%d). Is host ready?\n", ret);
574 drm_panel_remove(&ctx->panel);
575 return ret;
576 }
577
578 dev_info(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
579 ctx->desc->mode->hdisplay, ctx->desc->mode->vdisplay,
580 drm_mode_vrefresh(ctx->desc->mode),
581 mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
582
583 st7703_debugfs_init(ctx);
584 return 0;
585 }
586
st7703_shutdown(struct mipi_dsi_device * dsi)587 static void st7703_shutdown(struct mipi_dsi_device *dsi)
588 {
589 struct st7703 *ctx = mipi_dsi_get_drvdata(dsi);
590 int ret;
591
592 ret = drm_panel_unprepare(&ctx->panel);
593 if (ret < 0)
594 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
595
596 ret = drm_panel_disable(&ctx->panel);
597 if (ret < 0)
598 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
599 }
600
st7703_remove(struct mipi_dsi_device * dsi)601 static int st7703_remove(struct mipi_dsi_device *dsi)
602 {
603 struct st7703 *ctx = mipi_dsi_get_drvdata(dsi);
604 int ret;
605
606 st7703_shutdown(dsi);
607
608 ret = mipi_dsi_detach(dsi);
609 if (ret < 0)
610 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
611
612 drm_panel_remove(&ctx->panel);
613
614 st7703_debugfs_remove(ctx);
615
616 return 0;
617 }
618
619 static const struct of_device_id st7703_of_match[] = {
620 { .compatible = "rocktech,jh057n00900", .data = &jh057n00900_panel_desc },
621 { .compatible = "xingbangda,xbd599", .data = &xbd599_desc },
622 { /* sentinel */ }
623 };
624 MODULE_DEVICE_TABLE(of, st7703_of_match);
625
626 static struct mipi_dsi_driver st7703_driver = {
627 .probe = st7703_probe,
628 .remove = st7703_remove,
629 .shutdown = st7703_shutdown,
630 .driver = {
631 .name = DRV_NAME,
632 .of_match_table = st7703_of_match,
633 },
634 };
635 module_mipi_dsi_driver(st7703_driver);
636
637 MODULE_AUTHOR("Guido Günther <agx@sigxcpu.org>");
638 MODULE_DESCRIPTION("DRM driver for Sitronix ST7703 based MIPI DSI panels");
639 MODULE_LICENSE("GPL v2");
640