1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2016 InforceComputing
  4 * Copyright (C) 2016 Linaro Ltd
  5 * Copyright (C) 2023 BayLibre, SAS
  6 *
  7 * Authors:
  8 * - Vinay Simha BN <simhavcs@gmail.com>
  9 * - Sumit Semwal <sumit.semwal@linaro.org>
 10 * - Guillaume La Roque <glaroque@baylibre.com>
 11 *
 12 */
 13
 14#include <linux/backlight.h>
 15#include <linux/delay.h>
 16#include <linux/gpio/consumer.h>
 17#include <linux/module.h>
 18#include <linux/of.h>
 19#include <linux/regulator/consumer.h>
 20
 21#include <video/mipi_display.h>
 22
 23#include <drm/drm_mipi_dsi.h>
 24#include <drm/drm_modes.h>
 25#include <drm/drm_panel.h>
 26
 27#define DSI_REG_MCAP	0xB0
 28#define DSI_REG_IS	0xB3 /* Interface Setting */
 29#define DSI_REG_IIS	0xB4 /* Interface ID Setting */
 30#define DSI_REG_CTRL	0xB6
 31
 32enum {
 33	IOVCC = 0,
 34	POWER = 1
 35};
 36
 37struct stk_panel {
 38	const struct drm_display_mode *mode;
 39	struct backlight_device *backlight;
 40	struct drm_panel base;
 41	struct gpio_desc *enable_gpio; /* Power IC supply enable */
 42	struct gpio_desc *reset_gpio; /* External reset */
 43	struct mipi_dsi_device *dsi;
 44	struct regulator_bulk_data supplies[2];
 45};
 46
 47static inline struct stk_panel *to_stk_panel(struct drm_panel *panel)
 48{
 49	return container_of(panel, struct stk_panel, base);
 50}
 51
 52static int stk_panel_init(struct stk_panel *stk)
 53{
 54	struct mipi_dsi_device *dsi = stk->dsi;
 55	struct device *dev = &stk->dsi->dev;
 56	int ret;
 57
 58	ret = mipi_dsi_dcs_soft_reset(dsi);
 59	if (ret < 0) {
 60		dev_err(dev, "failed to mipi_dsi_dcs_soft_reset: %d\n", ret);
 61		return ret;
 62	}
 63	mdelay(5);
 64
 65	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 66	if (ret < 0) {
 67		dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
 68		return ret;
 69	}
 70	msleep(120);
 71
 72	mipi_dsi_generic_write_seq(dsi, DSI_REG_MCAP, 0x04);
 73
 74	/* Interface setting, video mode */
 75	mipi_dsi_generic_write_seq(dsi, DSI_REG_IS, 0x14, 0x08, 0x00, 0x22, 0x00);
 76	mipi_dsi_generic_write_seq(dsi, DSI_REG_IIS, 0x0C, 0x00);
 77	mipi_dsi_generic_write_seq(dsi, DSI_REG_CTRL, 0x3A, 0xD3);
 78
 79	ret = mipi_dsi_dcs_set_display_brightness(dsi, 0x77);
 80	if (ret < 0) {
 81		dev_err(dev, "failed to write display brightness: %d\n", ret);
 82		return ret;
 83	}
 84
 85	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 86			       MIPI_DCS_WRITE_MEMORY_START);
 87
 88	ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x77);
 89	if (ret < 0) {
 90		dev_err(dev, "failed to set pixel format: %d\n", ret);
 91		return ret;
 92	}
 93
 94	ret = mipi_dsi_dcs_set_column_address(dsi, 0, stk->mode->hdisplay - 1);
 95	if (ret < 0) {
 96		dev_err(dev, "failed to set column address: %d\n", ret);
 97		return ret;
 98	}
 99
100	ret = mipi_dsi_dcs_set_page_address(dsi, 0, stk->mode->vdisplay - 1);
101	if (ret < 0) {
102		dev_err(dev, "failed to set page address: %d\n", ret);
103		return ret;
104	}
105
106	return 0;
107}
108
109static int stk_panel_on(struct stk_panel *stk)
110{
111	struct mipi_dsi_device *dsi = stk->dsi;
112	struct device *dev = &stk->dsi->dev;
113	int ret;
114
115	ret = mipi_dsi_dcs_set_display_on(dsi);
116	if (ret < 0)
117		dev_err(dev, "failed to set display on: %d\n", ret);
118
119	mdelay(20);
120
121	return ret;
122}
123
124static void stk_panel_off(struct stk_panel *stk)
125{
126	struct mipi_dsi_device *dsi = stk->dsi;
127	struct device *dev = &stk->dsi->dev;
128	int ret;
129
130	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
131
132	ret = mipi_dsi_dcs_set_display_off(dsi);
133	if (ret < 0)
134		dev_err(dev, "failed to set display off: %d\n", ret);
135
136	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
137	if (ret < 0)
138		dev_err(dev, "failed to enter sleep mode: %d\n", ret);
139
140	msleep(100);
141}
142
143static int stk_panel_unprepare(struct drm_panel *panel)
144{
145	struct stk_panel *stk = to_stk_panel(panel);
146
147	stk_panel_off(stk);
148	regulator_bulk_disable(ARRAY_SIZE(stk->supplies), stk->supplies);
149	gpiod_set_value(stk->reset_gpio, 0);
150	gpiod_set_value(stk->enable_gpio, 1);
151
152	return 0;
153}
154
155static int stk_panel_prepare(struct drm_panel *panel)
156{
157	struct stk_panel *stk = to_stk_panel(panel);
158	struct device *dev = &stk->dsi->dev;
159	int ret;
160
161	gpiod_set_value(stk->reset_gpio, 0);
162	gpiod_set_value(stk->enable_gpio, 0);
163	ret = regulator_enable(stk->supplies[IOVCC].consumer);
164	if (ret < 0)
165		return ret;
166
167	mdelay(8);
168	ret = regulator_enable(stk->supplies[POWER].consumer);
169	if (ret < 0)
170		goto iovccoff;
171
172	mdelay(20);
173	gpiod_set_value(stk->enable_gpio, 1);
174	mdelay(20);
175	gpiod_set_value(stk->reset_gpio, 1);
176	mdelay(10);
177	ret = stk_panel_init(stk);
178	if (ret < 0) {
179		dev_err(dev, "failed to init panel: %d\n", ret);
180		goto poweroff;
181	}
182
183	ret = stk_panel_on(stk);
184	if (ret < 0) {
185		dev_err(dev, "failed to set panel on: %d\n", ret);
186		goto poweroff;
187	}
188
189	return 0;
190
191poweroff:
192	regulator_disable(stk->supplies[POWER].consumer);
193iovccoff:
194	regulator_disable(stk->supplies[IOVCC].consumer);
195	gpiod_set_value(stk->reset_gpio, 0);
196	gpiod_set_value(stk->enable_gpio, 0);
197
198	return ret;
199}
200
201static const struct drm_display_mode default_mode = {
202		.clock = 163204,
203		.hdisplay = 1200,
204		.hsync_start = 1200 + 144,
205		.hsync_end = 1200 + 144 + 16,
206		.htotal = 1200 + 144 + 16 + 45,
207		.vdisplay = 1920,
208		.vsync_start = 1920 + 8,
209		.vsync_end = 1920 + 8 + 4,
210		.vtotal = 1920 + 8 + 4 + 4,
211		.width_mm = 95,
212		.height_mm = 151,
213};
214
215static int stk_panel_get_modes(struct drm_panel *panel,
216			       struct drm_connector *connector)
217{
218	struct drm_display_mode *mode;
219
220	mode = drm_mode_duplicate(connector->dev, &default_mode);
221	if (!mode) {
222		dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
223			default_mode.hdisplay, default_mode.vdisplay,
224			drm_mode_vrefresh(&default_mode));
225		return -ENOMEM;
226	}
227
228	drm_mode_set_name(mode);
229	drm_mode_probed_add(connector, mode);
230	connector->display_info.width_mm = default_mode.width_mm;
231	connector->display_info.height_mm = default_mode.height_mm;
232	return 1;
233}
234
235static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
236{
237	struct mipi_dsi_device *dsi = bl_get_data(bl);
238	int ret;
239	u16 brightness;
240
241	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
242	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
243	if (ret < 0)
244		return ret;
245
246	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
247	return brightness & 0xff;
248}
249
250static int dsi_dcs_bl_update_status(struct backlight_device *bl)
251{
252	struct mipi_dsi_device *dsi = bl_get_data(bl);
253	struct device *dev = &dsi->dev;
254	int ret;
255
256	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
257	ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
258	if (ret < 0) {
259		dev_err(dev, "failed to set DSI control: %d\n", ret);
260		return ret;
261	}
262
263	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
264	return 0;
265}
266
267static const struct backlight_ops dsi_bl_ops = {
268	.update_status = dsi_dcs_bl_update_status,
269	.get_brightness = dsi_dcs_bl_get_brightness,
270};
271
272static struct backlight_device *
273drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
274{
275	struct device *dev = &dsi->dev;
276	struct backlight_properties props = {
277		.type = BACKLIGHT_RAW,
278		.brightness = 255,
279		.max_brightness = 255,
280	};
281
282	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
283					      &dsi_bl_ops, &props);
284}
285
286static const struct drm_panel_funcs stk_panel_funcs = {
287	.unprepare = stk_panel_unprepare,
288	.prepare = stk_panel_prepare,
289	.get_modes = stk_panel_get_modes,
290};
291
292static const struct of_device_id stk_of_match[] = {
293	{ .compatible = "startek,kd070fhfid015", },
294	{ }
295};
296MODULE_DEVICE_TABLE(of, stk_of_match);
297
298static int stk_panel_add(struct stk_panel *stk)
299{
300	struct device *dev = &stk->dsi->dev;
301	int ret;
302
303	stk->mode = &default_mode;
304
305	stk->supplies[IOVCC].supply = "iovcc";
306	stk->supplies[POWER].supply = "power";
307	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(stk->supplies), stk->supplies);
308	if (ret) {
309		dev_err(dev, "regulator_bulk failed\n");
310		return ret;
311	}
312
313	stk->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
314	if (IS_ERR(stk->reset_gpio)) {
315		ret = PTR_ERR(stk->reset_gpio);
316		dev_err(dev, "cannot get reset-gpios %d\n", ret);
317		return ret;
318	}
319
320	stk->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
321	if (IS_ERR(stk->enable_gpio)) {
322		ret = PTR_ERR(stk->enable_gpio);
323		dev_err(dev, "cannot get enable-gpio %d\n", ret);
324		return ret;
325	}
326
327	stk->backlight = drm_panel_create_dsi_backlight(stk->dsi);
328	if (IS_ERR(stk->backlight)) {
329		ret = PTR_ERR(stk->backlight);
330		dev_err(dev, "failed to register backlight %d\n", ret);
331		return ret;
332	}
333
334	drm_panel_init(&stk->base, &stk->dsi->dev, &stk_panel_funcs,
335		       DRM_MODE_CONNECTOR_DSI);
336
337	drm_panel_add(&stk->base);
338
339	return 0;
340}
341
342static int stk_panel_probe(struct mipi_dsi_device *dsi)
343{
344	struct stk_panel *stk;
345	int ret;
346
347	dsi->lanes = 4;
348	dsi->format = MIPI_DSI_FMT_RGB888;
349	dsi->mode_flags = (MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM);
350
351	stk = devm_kzalloc(&dsi->dev, sizeof(*stk), GFP_KERNEL);
352	if (!stk)
353		return -ENOMEM;
354
355	mipi_dsi_set_drvdata(dsi, stk);
356
357	stk->dsi = dsi;
358
359	ret = stk_panel_add(stk);
360	if (ret < 0)
361		return ret;
362
363	ret = mipi_dsi_attach(dsi);
364	if (ret < 0)
365		drm_panel_remove(&stk->base);
366
367	return 0;
368}
369
370static void stk_panel_remove(struct mipi_dsi_device *dsi)
371{
372	struct stk_panel *stk = mipi_dsi_get_drvdata(dsi);
373	int err;
374
375	err = mipi_dsi_detach(dsi);
376	if (err < 0)
377		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
378			err);
379
380	drm_panel_remove(&stk->base);
381}
382
383static struct mipi_dsi_driver stk_panel_driver = {
384	.driver = {
385		.name = "panel-startek-kd070fhfid015",
386		.of_match_table = stk_of_match,
387	},
388	.probe = stk_panel_probe,
389	.remove = stk_panel_remove,
390};
391module_mipi_dsi_driver(stk_panel_driver);
392
393MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
394MODULE_DESCRIPTION("STARTEK KD070FHFID015");
395MODULE_LICENSE("GPL");