1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Ilitek ILI9341 TFT LCD drm_panel driver.
4  *
5  * This panel can be configured to support:
6  * - 16-bit parallel RGB interface
7  * - 18-bit parallel RGB interface
8  * - 4-line serial spi interface
9  *
10  * Copyright (C) 2021 Dillon Min <dillon.minfei@gmail.com>
11  *
12  * For dbi+dpi part:
13  * Derived from drivers/drm/gpu/panel/panel-ilitek-ili9322.c
14  * the reuse of DBI abstraction part referred from Linus's patch
15  * "drm/panel: s6e63m0: Switch to DBI abstraction for SPI"
16  *
17  * For only-dbi part, copy from David's code (drm/tiny/ili9341.c)
18  * Copyright 2018 David Lechner <david@lechnology.com>
19  */
20 
21 #include <linux/backlight.h>
22 #include <linux/bitops.h>
23 #include <linux/delay.h>
24 #include <linux/gpio/consumer.h>
25 #include <linux/module.h>
26 #include <linux/of_device.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/spi/spi.h>
29 
30 #include <video/mipi_display.h>
31 
32 #include <drm/drm_atomic_helper.h>
33 #include <drm/drm_drv.h>
34 #include <drm/drm_fbdev_generic.h>
35 #include <drm/drm_gem_atomic_helper.h>
36 #include <drm/drm_gem_dma_helper.h>
37 #include <drm/drm_gem_framebuffer_helper.h>
38 #include <drm/drm_mipi_dbi.h>
39 #include <drm/drm_modes.h>
40 #include <drm/drm_panel.h>
41 #include <drm/drm_print.h>
42 
43 #define ILI9341_RGB_INTERFACE  0xb0   /* RGB Interface Signal Control */
44 #define ILI9341_FRC            0xb1   /* Frame Rate Control register */
45 #define ILI9341_DFC            0xb6   /* Display Function Control register */
46 #define ILI9341_POWER1         0xc0   /* Power Control 1 register */
47 #define ILI9341_POWER2         0xc1   /* Power Control 2 register */
48 #define ILI9341_VCOM1          0xc5   /* VCOM Control 1 register */
49 #define ILI9341_VCOM2          0xc7   /* VCOM Control 2 register */
50 #define ILI9341_POWERA         0xcb   /* Power control A register */
51 #define ILI9341_POWERB         0xcf   /* Power control B register */
52 #define ILI9341_PGAMMA         0xe0   /* Positive Gamma Correction register */
53 #define ILI9341_NGAMMA         0xe1   /* Negative Gamma Correction register */
54 #define ILI9341_DTCA           0xe8   /* Driver timing control A */
55 #define ILI9341_DTCB           0xea   /* Driver timing control B */
56 #define ILI9341_POWER_SEQ      0xed   /* Power on sequence register */
57 #define ILI9341_3GAMMA_EN      0xf2   /* 3 Gamma enable register */
58 #define ILI9341_INTERFACE      0xf6   /* Interface control register */
59 #define ILI9341_PRC            0xf7   /* Pump ratio control register */
60 #define ILI9341_ETMOD	       0xb7   /* Entry mode set */
61 
62 #define ILI9341_MADCTL_BGR	BIT(3)
63 #define ILI9341_MADCTL_MV	BIT(5)
64 #define ILI9341_MADCTL_MX	BIT(6)
65 #define ILI9341_MADCTL_MY	BIT(7)
66 
67 #define ILI9341_POWER_B_LEN	3
68 #define ILI9341_POWER_SEQ_LEN	4
69 #define ILI9341_DTCA_LEN	3
70 #define ILI9341_DTCB_LEN	2
71 #define ILI9341_POWER_A_LEN	5
72 #define ILI9341_DFC_1_LEN	2
73 #define ILI9341_FRC_LEN		2
74 #define ILI9341_VCOM_1_LEN	2
75 #define ILI9341_DFC_2_LEN	4
76 #define ILI9341_COLUMN_ADDR_LEN	4
77 #define ILI9341_PAGE_ADDR_LEN	4
78 #define ILI9341_INTERFACE_LEN	3
79 #define ILI9341_PGAMMA_LEN	15
80 #define ILI9341_NGAMMA_LEN	15
81 #define ILI9341_CA_LEN		3
82 
83 #define ILI9341_PIXEL_DPI_16_BITS	(BIT(6) | BIT(4))
84 #define ILI9341_PIXEL_DPI_18_BITS	(BIT(6) | BIT(5))
85 #define ILI9341_GAMMA_CURVE_1		BIT(0)
86 #define ILI9341_IF_WE_MODE		BIT(0)
87 #define ILI9341_IF_BIG_ENDIAN		0x00
88 #define ILI9341_IF_DM_RGB		BIT(2)
89 #define ILI9341_IF_DM_INTERNAL		0x00
90 #define ILI9341_IF_DM_VSYNC		BIT(3)
91 #define ILI9341_IF_RM_RGB		BIT(1)
92 #define ILI9341_IF_RIM_RGB		0x00
93 
94 #define ILI9341_COLUMN_ADDR		0x00ef
95 #define ILI9341_PAGE_ADDR		0x013f
96 
97 #define ILI9341_RGB_EPL			BIT(0)
98 #define ILI9341_RGB_DPL			BIT(1)
99 #define ILI9341_RGB_HSPL		BIT(2)
100 #define ILI9341_RGB_VSPL		BIT(3)
101 #define ILI9341_RGB_DE_MODE		BIT(6)
102 #define ILI9341_RGB_DISP_PATH_MEM	BIT(7)
103 
104 #define ILI9341_DBI_VCOMH_4P6V		0x23
105 #define ILI9341_DBI_PWR_2_DEFAULT	0x10
106 #define ILI9341_DBI_PRC_NORMAL		0x20
107 #define ILI9341_DBI_VCOM_1_VMH_4P25V	0x3e
108 #define ILI9341_DBI_VCOM_1_VML_1P5V	0x28
109 #define ILI9341_DBI_VCOM_2_DEC_58	0x86
110 #define ILI9341_DBI_FRC_DIVA		0x00
111 #define ILI9341_DBI_FRC_RTNA		0x1b
112 #define ILI9341_DBI_EMS_GAS		BIT(0)
113 #define ILI9341_DBI_EMS_DTS		BIT(1)
114 #define ILI9341_DBI_EMS_GON		BIT(2)
115 
116 /* struct ili9341_config - the system specific ILI9341 configuration */
117 struct ili9341_config {
118 	u32 max_spi_speed;
119 	/* mode: the drm display mode */
120 	const struct drm_display_mode mode;
121 	/* ca: TODO: need comments for this register */
122 	u8 ca[ILI9341_CA_LEN];
123 	/* power_b: TODO: need comments for this register */
124 	u8 power_b[ILI9341_POWER_B_LEN];
125 	/* power_seq: TODO: need comments for this register */
126 	u8 power_seq[ILI9341_POWER_SEQ_LEN];
127 	/* dtca: TODO: need comments for this register */
128 	u8 dtca[ILI9341_DTCA_LEN];
129 	/* dtcb: TODO: need comments for this register */
130 	u8 dtcb[ILI9341_DTCB_LEN];
131 	/* power_a: TODO: need comments for this register */
132 	u8 power_a[ILI9341_POWER_A_LEN];
133 	/* frc: Frame Rate Control (In Normal Mode/Full Colors) (B1h) */
134 	u8 frc[ILI9341_FRC_LEN];
135 	/* prc: TODO: need comments for this register */
136 	u8 prc;
137 	/* dfc_1: B6h DISCTRL (Display Function Control) */
138 	u8 dfc_1[ILI9341_DFC_1_LEN];
139 	/* power_1: Power Control 1 (C0h) */
140 	u8 power_1;
141 	/* power_2: Power Control 2 (C1h) */
142 	u8 power_2;
143 	/* vcom_1: VCOM Control 1(C5h) */
144 	u8 vcom_1[ILI9341_VCOM_1_LEN];
145 	/* vcom_2: VCOM Control 2(C7h) */
146 	u8 vcom_2;
147 	/* address_mode: Memory Access Control (36h) */
148 	u8 address_mode;
149 	/* g3amma_en: TODO: need comments for this register */
150 	u8 g3amma_en;
151 	/* rgb_interface: RGB Interface Signal Control (B0h) */
152 	u8 rgb_interface;
153 	/* dfc_2: refer to dfc_1 */
154 	u8 dfc_2[ILI9341_DFC_2_LEN];
155 	/* column_addr: Column Address Set (2Ah) */
156 	u8 column_addr[ILI9341_COLUMN_ADDR_LEN];
157 	/* page_addr: Page Address Set (2Bh) */
158 	u8 page_addr[ILI9341_PAGE_ADDR_LEN];
159 	/* interface: Interface Control (F6h) */
160 	u8 interface[ILI9341_INTERFACE_LEN];
161 	/*
162 	 * pixel_format: This command sets the pixel format for the RGB
163 	 * image data used by
164 	 */
165 	u8 pixel_format;
166 	/*
167 	 * gamma_curve: This command is used to select the desired Gamma
168 	 * curve for the
169 	 */
170 	u8 gamma_curve;
171 	/* pgamma: Positive Gamma Correction (E0h) */
172 	u8 pgamma[ILI9341_PGAMMA_LEN];
173 	/* ngamma: Negative Gamma Correction (E1h) */
174 	u8 ngamma[ILI9341_NGAMMA_LEN];
175 };
176 
177 struct ili9341 {
178 	struct device *dev;
179 	const struct ili9341_config *conf;
180 	struct drm_panel panel;
181 	struct gpio_desc *reset_gpio;
182 	struct gpio_desc *dc_gpio;
183 	struct mipi_dbi *dbi;
184 	u32 max_spi_speed;
185 	struct regulator_bulk_data supplies[3];
186 };
187 
188 /*
189  * The Stm32f429-disco board has a panel ili9341 connected to ltdc controller
190  */
191 static const struct ili9341_config ili9341_stm32f429_disco_data = {
192 	.max_spi_speed = 10000000,
193 	.mode = {
194 		.clock = 6100,
195 		.hdisplay = 240,
196 		.hsync_start = 240 + 10,/* hfp 10 */
197 		.hsync_end = 240 + 10 + 10,/* hsync 10 */
198 		.htotal = 240 + 10 + 10 + 20,/* hbp 20 */
199 		.vdisplay = 320,
200 		.vsync_start = 320 + 4,/* vfp 4 */
201 		.vsync_end = 320 + 4 + 2,/* vsync 2 */
202 		.vtotal = 320 + 4 + 2 + 2,/* vbp 2 */
203 		.flags = 0,
204 		.width_mm = 65,
205 		.height_mm = 50,
206 		.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
207 	},
208 	.ca = {0xc3, 0x08, 0x50},
209 	.power_b = {0x00, 0xc1, 0x30},
210 	.power_seq = {0x64, 0x03, 0x12, 0x81},
211 	.dtca = {0x85, 0x00, 0x78},
212 	.power_a = {0x39, 0x2c, 0x00, 0x34, 0x02},
213 	.prc = 0x20,
214 	.dtcb = {0x00, 0x00},
215 	/* 0x00 fosc, 0x1b 70hz */
216 	.frc = {0x00, 0x1b},
217 	/*
218 	 * 0x0a Interval scan, AGND AGND AGND AGND
219 	 * 0xa2 Normally white, G1 -> G320, S720 -> S1,
220 	 *	Scan Cycle 5 frames,85ms
221 	 */
222 	.dfc_1 = {0x0a, 0xa2},
223 	/* 0x10 3.65v */
224 	.power_1 = 0x10,
225 	/* 0x10 AVDD=vci*2, VGH=vci*7, VGL=-vci*4 */
226 	.power_2 = 0x10,
227 	/* 0x45 VCOMH 4.425v, 0x15 VCOML -1.975*/
228 	.vcom_1 = {0x45, 0x15},
229 	/* 0x90 offset voltage, VMH-48, VML-48 */
230 	.vcom_2 = 0x90,
231 	/*
232 	 * 0xc8 Row Address Order, Column Address Order
233 	 * BGR 1
234 	 */
235 	.address_mode = 0xc8,
236 	.g3amma_en = 0x00,
237 	/*
238 	 * 0xc2
239 	 * Display Data Path: Memory
240 	 * RGB: DE mode
241 	 * DOTCLK polarity set (data fetched at the falling time)
242 	 */
243 	.rgb_interface = ILI9341_RGB_DISP_PATH_MEM |
244 			ILI9341_RGB_DE_MODE |
245 			ILI9341_RGB_DPL,
246 	/*
247 	 * 0x0a
248 	 * Gate outputs in non-display area: Interval scan
249 	 * Determine source/VCOM output in a non-display area in the partial
250 	 * display mode: AGND AGND AGND AGND
251 	 *
252 	 * 0xa7
253 	 * Scan Cycle: 15 frames
254 	 * fFLM = 60Hz: 255ms
255 	 * Liquid crystal type: Normally white
256 	 * Gate Output Scan Direction: G1 -> G320
257 	 * Source Output Scan Direction: S720 -> S1
258 	 *
259 	 * 0x27
260 	 * LCD Driver Line: 320 lines
261 	 *
262 	 * 0x04
263 	 * PCDIV: 4
264 	 */
265 	.dfc_2 = {0x0a, 0xa7, 0x27, 0x04},
266 	/* column address: 240 */
267 	.column_addr = {0x00, 0x00, (ILI9341_COLUMN_ADDR >> 4) & 0xff,
268 				ILI9341_COLUMN_ADDR & 0xff},
269 	/* page address: 320 */
270 	.page_addr = {0x00, 0x00, (ILI9341_PAGE_ADDR >> 4) & 0xff,
271 				ILI9341_PAGE_ADDR & 0xff},
272 	/*
273 	 * Memory write control: When the transfer number of data exceeds
274 	 * (EC-SC+1)*(EP-SP+1), the column and page number will be
275 	 * reset, and the exceeding data will be written into the following
276 	 * column and page.
277 	 * Display Operation Mode: RGB Interface Mode
278 	 * Interface for RAM Access: RGB interface
279 	 * 16- bit RGB interface (1 transfer/pixel)
280 	 */
281 	.interface = {ILI9341_IF_WE_MODE, 0x00,
282 			ILI9341_IF_DM_RGB | ILI9341_IF_RM_RGB},
283 	/* DPI: 16 bits / pixel */
284 	.pixel_format = ILI9341_PIXEL_DPI_16_BITS,
285 	/* Curve Selected: Gamma curve 1 (G2.2) */
286 	.gamma_curve = ILI9341_GAMMA_CURVE_1,
287 	.pgamma = {0x0f, 0x29, 0x24, 0x0c, 0x0e,
288 			0x09, 0x4e, 0x78, 0x3c, 0x09,
289 			0x13, 0x05, 0x17, 0x11, 0x00},
290 	.ngamma = {0x00, 0x16, 0x1b, 0x04, 0x11,
291 			0x07, 0x31, 0x33, 0x42, 0x05,
292 			0x0c, 0x0a, 0x28, 0x2f, 0x0f},
293 };
294 
295 static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
296 {
297 	return container_of(panel, struct ili9341, panel);
298 }
299 
300 static void ili9341_dpi_init(struct ili9341 *ili)
301 {
302 	struct device *dev = (&ili->panel)->dev;
303 	struct mipi_dbi *dbi = ili->dbi;
304 	struct ili9341_config *cfg = (struct ili9341_config *)ili->conf;
305 
306 	/* Power Control */
307 	mipi_dbi_command_stackbuf(dbi, 0xca, cfg->ca, ILI9341_CA_LEN);
308 	mipi_dbi_command_stackbuf(dbi, ILI9341_POWERB, cfg->power_b,
309 				  ILI9341_POWER_B_LEN);
310 	mipi_dbi_command_stackbuf(dbi, ILI9341_POWER_SEQ, cfg->power_seq,
311 				  ILI9341_POWER_SEQ_LEN);
312 	mipi_dbi_command_stackbuf(dbi, ILI9341_DTCA, cfg->dtca,
313 				  ILI9341_DTCA_LEN);
314 	mipi_dbi_command_stackbuf(dbi, ILI9341_POWERA, cfg->power_a,
315 				  ILI9341_POWER_A_LEN);
316 	mipi_dbi_command(ili->dbi, ILI9341_PRC, cfg->prc);
317 	mipi_dbi_command_stackbuf(dbi, ILI9341_DTCB, cfg->dtcb,
318 				  ILI9341_DTCB_LEN);
319 	mipi_dbi_command_stackbuf(dbi, ILI9341_FRC, cfg->frc, ILI9341_FRC_LEN);
320 	mipi_dbi_command_stackbuf(dbi, ILI9341_DFC, cfg->dfc_1,
321 				  ILI9341_DFC_1_LEN);
322 	mipi_dbi_command(dbi, ILI9341_POWER1, cfg->power_1);
323 	mipi_dbi_command(dbi, ILI9341_POWER2, cfg->power_2);
324 
325 	/* VCOM */
326 	mipi_dbi_command_stackbuf(dbi, ILI9341_VCOM1, cfg->vcom_1,
327 				  ILI9341_VCOM_1_LEN);
328 	mipi_dbi_command(dbi, ILI9341_VCOM2, cfg->vcom_2);
329 	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, cfg->address_mode);
330 
331 	/* Gamma */
332 	mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, cfg->g3amma_en);
333 	mipi_dbi_command(dbi, ILI9341_RGB_INTERFACE, cfg->rgb_interface);
334 	mipi_dbi_command_stackbuf(dbi, ILI9341_DFC, cfg->dfc_2,
335 				  ILI9341_DFC_2_LEN);
336 
337 	/* Colomn address set */
338 	mipi_dbi_command_stackbuf(dbi, MIPI_DCS_SET_COLUMN_ADDRESS,
339 				  cfg->column_addr, ILI9341_COLUMN_ADDR_LEN);
340 
341 	/* Page address set */
342 	mipi_dbi_command_stackbuf(dbi, MIPI_DCS_SET_PAGE_ADDRESS,
343 				  cfg->page_addr, ILI9341_PAGE_ADDR_LEN);
344 	mipi_dbi_command_stackbuf(dbi, ILI9341_INTERFACE, cfg->interface,
345 				  ILI9341_INTERFACE_LEN);
346 
347 	/* Format */
348 	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT, cfg->pixel_format);
349 	mipi_dbi_command(dbi, MIPI_DCS_WRITE_MEMORY_START);
350 	msleep(200);
351 	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, cfg->gamma_curve);
352 	mipi_dbi_command_stackbuf(dbi, ILI9341_PGAMMA, cfg->pgamma,
353 				  ILI9341_PGAMMA_LEN);
354 	mipi_dbi_command_stackbuf(dbi, ILI9341_NGAMMA, cfg->ngamma,
355 				  ILI9341_NGAMMA_LEN);
356 	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
357 	msleep(200);
358 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
359 	mipi_dbi_command(dbi, MIPI_DCS_WRITE_MEMORY_START);
360 
361 	dev_info(dev, "Initialized display rgb interface\n");
362 }
363 
364 static int ili9341_dpi_power_on(struct ili9341 *ili)
365 {
366 	struct device *dev = (&ili->panel)->dev;
367 	int ret = 0;
368 
369 	/* Assert RESET */
370 	gpiod_set_value(ili->reset_gpio, 1);
371 
372 	/* Enable power */
373 	ret = regulator_bulk_enable(ARRAY_SIZE(ili->supplies),
374 				    ili->supplies);
375 	if (ret < 0) {
376 		dev_err(dev, "unable to enable vcc\n");
377 		return ret;
378 	}
379 	msleep(20);
380 
381 	/* De-assert RESET */
382 	gpiod_set_value(ili->reset_gpio, 0);
383 	msleep(20);
384 
385 	return 0;
386 }
387 
388 static int ili9341_dpi_power_off(struct ili9341 *ili)
389 {
390 	/* Assert RESET */
391 	gpiod_set_value(ili->reset_gpio, 1);
392 
393 	/* Disable power */
394 	return regulator_bulk_disable(ARRAY_SIZE(ili->supplies),
395 				      ili->supplies);
396 }
397 
398 static int ili9341_dpi_disable(struct drm_panel *panel)
399 {
400 	struct ili9341 *ili = panel_to_ili9341(panel);
401 
402 	mipi_dbi_command(ili->dbi, MIPI_DCS_SET_DISPLAY_OFF);
403 	return 0;
404 }
405 
406 static int ili9341_dpi_unprepare(struct drm_panel *panel)
407 {
408 	struct ili9341 *ili = panel_to_ili9341(panel);
409 
410 	return ili9341_dpi_power_off(ili);
411 }
412 
413 static int ili9341_dpi_prepare(struct drm_panel *panel)
414 {
415 	struct ili9341 *ili = panel_to_ili9341(panel);
416 	int ret;
417 
418 	ret = ili9341_dpi_power_on(ili);
419 	if (ret < 0)
420 		return ret;
421 
422 	ili9341_dpi_init(ili);
423 
424 	return ret;
425 }
426 
427 static int ili9341_dpi_enable(struct drm_panel *panel)
428 {
429 	struct ili9341 *ili = panel_to_ili9341(panel);
430 
431 	mipi_dbi_command(ili->dbi, MIPI_DCS_SET_DISPLAY_ON);
432 	return 0;
433 }
434 
435 static int ili9341_dpi_get_modes(struct drm_panel *panel,
436 				 struct drm_connector *connector)
437 {
438 	struct ili9341 *ili = panel_to_ili9341(panel);
439 	struct drm_device *drm = connector->dev;
440 	struct drm_display_mode *mode;
441 	struct drm_display_info *info;
442 
443 	info = &connector->display_info;
444 	info->width_mm = ili->conf->mode.width_mm;
445 	info->height_mm = ili->conf->mode.height_mm;
446 
447 	if (ili->conf->rgb_interface & ILI9341_RGB_DPL)
448 		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
449 	else
450 		info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
451 
452 	if (ili->conf->rgb_interface & ILI9341_RGB_EPL)
453 		info->bus_flags |= DRM_BUS_FLAG_DE_LOW;
454 	else
455 		info->bus_flags |= DRM_BUS_FLAG_DE_HIGH;
456 
457 	mode = drm_mode_duplicate(drm, &ili->conf->mode);
458 	if (!mode) {
459 		drm_err(drm, "bad mode or failed to add mode\n");
460 		return -EINVAL;
461 	}
462 	drm_mode_set_name(mode);
463 
464 	/* Set up the polarity */
465 	if (ili->conf->rgb_interface & ILI9341_RGB_HSPL)
466 		mode->flags |= DRM_MODE_FLAG_PHSYNC;
467 	else
468 		mode->flags |= DRM_MODE_FLAG_NHSYNC;
469 
470 	if (ili->conf->rgb_interface & ILI9341_RGB_VSPL)
471 		mode->flags |= DRM_MODE_FLAG_PVSYNC;
472 	else
473 		mode->flags |= DRM_MODE_FLAG_NVSYNC;
474 
475 	drm_mode_probed_add(connector, mode);
476 
477 	return 1; /* Number of modes */
478 }
479 
480 static const struct drm_panel_funcs ili9341_dpi_funcs = {
481 	.disable = ili9341_dpi_disable,
482 	.unprepare = ili9341_dpi_unprepare,
483 	.prepare = ili9341_dpi_prepare,
484 	.enable = ili9341_dpi_enable,
485 	.get_modes = ili9341_dpi_get_modes,
486 };
487 
488 static void ili9341_dbi_enable(struct drm_simple_display_pipe *pipe,
489 			       struct drm_crtc_state *crtc_state,
490 			       struct drm_plane_state *plane_state)
491 {
492 	struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
493 	struct mipi_dbi *dbi = &dbidev->dbi;
494 	u8 addr_mode;
495 	int ret, idx;
496 
497 	if (!drm_dev_enter(pipe->crtc.dev, &idx))
498 		return;
499 
500 	ret = mipi_dbi_poweron_conditional_reset(dbidev);
501 	if (ret < 0)
502 		goto out_exit;
503 	if (ret == 1)
504 		goto out_enable;
505 
506 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_OFF);
507 
508 	mipi_dbi_command(dbi, ILI9341_POWERB, 0x00, 0xc1, 0x30);
509 	mipi_dbi_command(dbi, ILI9341_POWER_SEQ, 0x64, 0x03, 0x12, 0x81);
510 	mipi_dbi_command(dbi, ILI9341_DTCA, 0x85, 0x00, 0x78);
511 	mipi_dbi_command(dbi, ILI9341_POWERA, 0x39, 0x2c, 0x00, 0x34, 0x02);
512 	mipi_dbi_command(dbi, ILI9341_PRC, ILI9341_DBI_PRC_NORMAL);
513 	mipi_dbi_command(dbi, ILI9341_DTCB, 0x00, 0x00);
514 
515 	/* Power Control */
516 	mipi_dbi_command(dbi, ILI9341_POWER1, ILI9341_DBI_VCOMH_4P6V);
517 	mipi_dbi_command(dbi, ILI9341_POWER2, ILI9341_DBI_PWR_2_DEFAULT);
518 	/* VCOM */
519 	mipi_dbi_command(dbi, ILI9341_VCOM1, ILI9341_DBI_VCOM_1_VMH_4P25V,
520 			 ILI9341_DBI_VCOM_1_VML_1P5V);
521 	mipi_dbi_command(dbi, ILI9341_VCOM2, ILI9341_DBI_VCOM_2_DEC_58);
522 
523 	/* Memory Access Control */
524 	mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
525 			 MIPI_DCS_PIXEL_FMT_16BIT);
526 
527 	/* Frame Rate */
528 	mipi_dbi_command(dbi, ILI9341_FRC, ILI9341_DBI_FRC_DIVA & 0x03,
529 			 ILI9341_DBI_FRC_RTNA & 0x1f);
530 
531 	/* Gamma */
532 	mipi_dbi_command(dbi, ILI9341_3GAMMA_EN, 0x00);
533 	mipi_dbi_command(dbi, MIPI_DCS_SET_GAMMA_CURVE, ILI9341_GAMMA_CURVE_1);
534 	mipi_dbi_command(dbi, ILI9341_PGAMMA,
535 			 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
536 			 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
537 	mipi_dbi_command(dbi, ILI9341_NGAMMA,
538 			 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
539 			 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
540 
541 	/* DDRAM */
542 	mipi_dbi_command(dbi, ILI9341_ETMOD, ILI9341_DBI_EMS_GAS |
543 			 ILI9341_DBI_EMS_DTS |
544 			 ILI9341_DBI_EMS_GON);
545 
546 	/* Display */
547 	mipi_dbi_command(dbi, ILI9341_DFC, 0x08, 0x82, 0x27, 0x00);
548 	mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
549 	msleep(100);
550 
551 	mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
552 	msleep(100);
553 
554 out_enable:
555 	switch (dbidev->rotation) {
556 	default:
557 		addr_mode = ILI9341_MADCTL_MX;
558 		break;
559 	case 90:
560 		addr_mode = ILI9341_MADCTL_MV;
561 		break;
562 	case 180:
563 		addr_mode = ILI9341_MADCTL_MY;
564 		break;
565 	case 270:
566 		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |
567 			    ILI9341_MADCTL_MX;
568 		break;
569 	}
570 
571 	addr_mode |= ILI9341_MADCTL_BGR;
572 	mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
573 	mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
574 	drm_info(&dbidev->drm, "Initialized display serial interface\n");
575 out_exit:
576 	drm_dev_exit(idx);
577 }
578 
579 static const struct drm_simple_display_pipe_funcs ili9341_dbi_funcs = {
580 	.mode_valid = mipi_dbi_pipe_mode_valid,
581 	.enable = ili9341_dbi_enable,
582 	.disable = mipi_dbi_pipe_disable,
583 	.update = mipi_dbi_pipe_update,
584 	.prepare_fb = drm_gem_simple_display_pipe_prepare_fb,
585 };
586 
587 static const struct drm_display_mode ili9341_dbi_mode = {
588 	DRM_SIMPLE_MODE(240, 320, 37, 49),
589 };
590 
591 DEFINE_DRM_GEM_DMA_FOPS(ili9341_dbi_fops);
592 
593 static struct drm_driver ili9341_dbi_driver = {
594 	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
595 	.fops			= &ili9341_dbi_fops,
596 	DRM_GEM_DMA_DRIVER_OPS_VMAP,
597 	.debugfs_init		= mipi_dbi_debugfs_init,
598 	.name			= "ili9341",
599 	.desc			= "Ilitek ILI9341",
600 	.date			= "20210716",
601 	.major			= 1,
602 	.minor			= 0,
603 };
604 
605 static int ili9341_dbi_probe(struct spi_device *spi, struct gpio_desc *dc,
606 			     struct gpio_desc *reset)
607 {
608 	struct device *dev = &spi->dev;
609 	struct mipi_dbi_dev *dbidev;
610 	struct mipi_dbi *dbi;
611 	struct drm_device *drm;
612 	struct regulator *vcc;
613 	u32 rotation = 0;
614 	int ret;
615 
616 	vcc = devm_regulator_get_optional(dev, "vcc");
617 	if (IS_ERR(vcc)) {
618 		dev_err(dev, "get optional vcc failed\n");
619 		vcc = NULL;
620 	}
621 
622 	dbidev = devm_drm_dev_alloc(dev, &ili9341_dbi_driver,
623 				    struct mipi_dbi_dev, drm);
624 	if (IS_ERR(dbidev))
625 		return PTR_ERR(dbidev);
626 
627 	dbi = &dbidev->dbi;
628 	drm = &dbidev->drm;
629 	dbi->reset = reset;
630 	dbidev->regulator = vcc;
631 
632 	drm_mode_config_init(drm);
633 
634 	dbidev->backlight = devm_of_find_backlight(dev);
635 	if (IS_ERR(dbidev->backlight))
636 		return PTR_ERR(dbidev->backlight);
637 
638 	device_property_read_u32(dev, "rotation", &rotation);
639 
640 	ret = mipi_dbi_spi_init(spi, dbi, dc);
641 	if (ret)
642 		return ret;
643 
644 	ret = mipi_dbi_dev_init(dbidev, &ili9341_dbi_funcs,
645 				&ili9341_dbi_mode, rotation);
646 	if (ret)
647 		return ret;
648 
649 	drm_mode_config_reset(drm);
650 
651 	ret = drm_dev_register(drm, 0);
652 	if (ret)
653 		return ret;
654 
655 	spi_set_drvdata(spi, drm);
656 
657 	drm_fbdev_generic_setup(drm, 0);
658 
659 	return 0;
660 }
661 
662 static int ili9341_dpi_probe(struct spi_device *spi, struct gpio_desc *dc,
663 			     struct gpio_desc *reset)
664 {
665 	struct device *dev = &spi->dev;
666 	struct ili9341 *ili;
667 	int ret;
668 
669 	ili = devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL);
670 	if (!ili)
671 		return -ENOMEM;
672 
673 	ili->dbi = devm_kzalloc(dev, sizeof(struct mipi_dbi),
674 				GFP_KERNEL);
675 	if (!ili->dbi)
676 		return -ENOMEM;
677 
678 	ili->supplies[0].supply = "vci";
679 	ili->supplies[1].supply = "vddi";
680 	ili->supplies[2].supply = "vddi-led";
681 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ili->supplies),
682 				      ili->supplies);
683 	if (ret < 0) {
684 		dev_err(dev, "failed to get regulators: %d\n", ret);
685 		return ret;
686 	}
687 
688 	ret = mipi_dbi_spi_init(spi, ili->dbi, dc);
689 	if (ret)
690 		return ret;
691 
692 	spi_set_drvdata(spi, ili);
693 	ili->reset_gpio = reset;
694 	/*
695 	 * Every new incarnation of this display must have a unique
696 	 * data entry for the system in this driver.
697 	 */
698 	ili->conf = of_device_get_match_data(dev);
699 	if (!ili->conf) {
700 		dev_err(dev, "missing device configuration\n");
701 		return -ENODEV;
702 	}
703 
704 	ili->max_spi_speed = ili->conf->max_spi_speed;
705 	drm_panel_init(&ili->panel, dev, &ili9341_dpi_funcs,
706 		       DRM_MODE_CONNECTOR_DPI);
707 	drm_panel_add(&ili->panel);
708 
709 	return 0;
710 }
711 
712 static int ili9341_probe(struct spi_device *spi)
713 {
714 	struct device *dev = &spi->dev;
715 	struct gpio_desc *dc;
716 	struct gpio_desc *reset;
717 	const struct spi_device_id *id = spi_get_device_id(spi);
718 
719 	reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
720 	if (IS_ERR(reset))
721 		dev_err(dev, "Failed to get gpio 'reset'\n");
722 
723 	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);
724 	if (IS_ERR(dc))
725 		dev_err(dev, "Failed to get gpio 'dc'\n");
726 
727 	if (!strcmp(id->name, "sf-tc240t-9370-t"))
728 		return ili9341_dpi_probe(spi, dc, reset);
729 	else if (!strcmp(id->name, "yx240qv29"))
730 		return ili9341_dbi_probe(spi, dc, reset);
731 
732 	return -1;
733 }
734 
735 static void ili9341_remove(struct spi_device *spi)
736 {
737 	const struct spi_device_id *id = spi_get_device_id(spi);
738 	struct ili9341 *ili = spi_get_drvdata(spi);
739 	struct drm_device *drm = spi_get_drvdata(spi);
740 
741 	if (!strcmp(id->name, "sf-tc240t-9370-t")) {
742 		ili9341_dpi_power_off(ili);
743 		drm_panel_remove(&ili->panel);
744 	} else if (!strcmp(id->name, "yx240qv29")) {
745 		drm_dev_unplug(drm);
746 		drm_atomic_helper_shutdown(drm);
747 	}
748 }
749 
750 static void ili9341_shutdown(struct spi_device *spi)
751 {
752 	const struct spi_device_id *id = spi_get_device_id(spi);
753 
754 	if (!strcmp(id->name, "yx240qv29"))
755 		drm_atomic_helper_shutdown(spi_get_drvdata(spi));
756 }
757 
758 static const struct of_device_id ili9341_of_match[] = {
759 	{
760 		.compatible = "st,sf-tc240t-9370-t",
761 		.data = &ili9341_stm32f429_disco_data,
762 	},
763 	{
764 		/* porting from tiny/ili9341.c
765 		 * for original mipi dbi compitable
766 		 */
767 		.compatible = "adafruit,yx240qv29",
768 		.data = NULL,
769 	},
770 	{ }
771 };
772 MODULE_DEVICE_TABLE(of, ili9341_of_match);
773 
774 static const struct spi_device_id ili9341_id[] = {
775 	{ "yx240qv29", 0 },
776 	{ "sf-tc240t-9370-t", 0 },
777 	{ }
778 };
779 MODULE_DEVICE_TABLE(spi, ili9341_id);
780 
781 static struct spi_driver ili9341_driver = {
782 	.probe = ili9341_probe,
783 	.remove = ili9341_remove,
784 	.shutdown = ili9341_shutdown,
785 	.id_table = ili9341_id,
786 	.driver = {
787 		.name = "panel-ilitek-ili9341",
788 		.of_match_table = ili9341_of_match,
789 	},
790 };
791 module_spi_driver(ili9341_driver);
792 
793 MODULE_AUTHOR("Dillon Min <dillon.minfei@gmail.com>");
794 MODULE_DESCRIPTION("ILI9341 LCD panel driver");
795 MODULE_LICENSE("GPL v2");
796