1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * MIPI-DSI Samsung s6d16d0 panel driver. This is a 864x480
  4 * AMOLED panel with a command-only DSI interface.
  5 */
  6
  7#include <drm/drm_modes.h>
  8#include <drm/drm_mipi_dsi.h>
  9#include <drm/drm_panel.h>
 10#include <drm/drm_print.h>
 11
 12#include <linux/gpio/consumer.h>
 13#include <linux/regulator/consumer.h>
 14#include <linux/delay.h>
 15#include <linux/of_device.h>
 16#include <linux/module.h>
 17
 18struct s6d16d0 {
 19	struct device *dev;
 20	struct drm_panel panel;
 21	struct regulator *supply;
 22	struct gpio_desc *reset_gpio;
 23};
 24
 25/*
 26 * The timings are not very helpful as the display is used in
 27 * command mode.
 28 */
 29static const struct drm_display_mode samsung_s6d16d0_mode = {
 30	/* HS clock, (htotal*vtotal*vrefresh)/1000 */
 31	.clock = 420160,
 32	.hdisplay = 864,
 33	.hsync_start = 864 + 154,
 34	.hsync_end = 864 + 154 + 16,
 35	.htotal = 864 + 154 + 16 + 32,
 36	.vdisplay = 480,
 37	.vsync_start = 480 + 1,
 38	.vsync_end = 480 + 1 + 1,
 39	.vtotal = 480 + 1 + 1 + 1,
 40	.width_mm = 84,
 41	.height_mm = 48,
 42};
 43
 44static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel)
 45{
 46	return container_of(panel, struct s6d16d0, panel);
 47}
 48
 49static int s6d16d0_unprepare(struct drm_panel *panel)
 50{
 51	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
 52	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
 53	int ret;
 54
 55	/* Enter sleep mode */
 56	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 57	if (ret) {
 58		DRM_DEV_ERROR(s6->dev, "failed to enter sleep mode (%d)\n",
 59			      ret);
 60		return ret;
 61	}
 62
 63	/* Assert RESET */
 64	gpiod_set_value_cansleep(s6->reset_gpio, 1);
 65	regulator_disable(s6->supply);
 66
 67	return 0;
 68}
 69
 70static int s6d16d0_prepare(struct drm_panel *panel)
 71{
 72	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
 73	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
 74	int ret;
 75
 76	ret = regulator_enable(s6->supply);
 77	if (ret) {
 78		DRM_DEV_ERROR(s6->dev, "failed to enable supply (%d)\n", ret);
 79		return ret;
 80	}
 81
 82	/* Assert RESET */
 83	gpiod_set_value_cansleep(s6->reset_gpio, 1);
 84	udelay(10);
 85	/* De-assert RESET */
 86	gpiod_set_value_cansleep(s6->reset_gpio, 0);
 87	msleep(120);
 88
 89	/* Enabe tearing mode: send TE (tearing effect) at VBLANK */
 90	ret = mipi_dsi_dcs_set_tear_on(dsi,
 91				       MIPI_DSI_DCS_TEAR_MODE_VBLANK);
 92	if (ret) {
 93		DRM_DEV_ERROR(s6->dev, "failed to enable vblank TE (%d)\n",
 94			      ret);
 95		return ret;
 96	}
 97	/* Exit sleep mode and power on */
 98	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
 99	if (ret) {
100		DRM_DEV_ERROR(s6->dev, "failed to exit sleep mode (%d)\n",
101			      ret);
102		return ret;
103	}
104
105	return 0;
106}
107
108static int s6d16d0_enable(struct drm_panel *panel)
109{
110	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
111	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
112	int ret;
113
114	ret = mipi_dsi_dcs_set_display_on(dsi);
115	if (ret) {
116		DRM_DEV_ERROR(s6->dev, "failed to turn display on (%d)\n",
117			      ret);
118		return ret;
119	}
120
121	return 0;
122}
123
124static int s6d16d0_disable(struct drm_panel *panel)
125{
126	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
127	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
128	int ret;
129
130	ret = mipi_dsi_dcs_set_display_off(dsi);
131	if (ret) {
132		DRM_DEV_ERROR(s6->dev, "failed to turn display off (%d)\n",
133			      ret);
134		return ret;
135	}
136
137	return 0;
138}
139
140static int s6d16d0_get_modes(struct drm_panel *panel,
141			     struct drm_connector *connector)
142{
143	struct drm_display_mode *mode;
144
145	mode = drm_mode_duplicate(connector->dev, &samsung_s6d16d0_mode);
146	if (!mode) {
147		DRM_ERROR("bad mode or failed to add mode\n");
148		return -EINVAL;
149	}
150	drm_mode_set_name(mode);
151	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
152
153	connector->display_info.width_mm = mode->width_mm;
154	connector->display_info.height_mm = mode->height_mm;
155
156	drm_mode_probed_add(connector, mode);
157
158	return 1; /* Number of modes */
159}
160
161static const struct drm_panel_funcs s6d16d0_drm_funcs = {
162	.disable = s6d16d0_disable,
163	.unprepare = s6d16d0_unprepare,
164	.prepare = s6d16d0_prepare,
165	.enable = s6d16d0_enable,
166	.get_modes = s6d16d0_get_modes,
167};
168
169static int s6d16d0_probe(struct mipi_dsi_device *dsi)
170{
171	struct device *dev = &dsi->dev;
172	struct s6d16d0 *s6;
173	int ret;
174
175	s6 = devm_kzalloc(dev, sizeof(struct s6d16d0), GFP_KERNEL);
176	if (!s6)
177		return -ENOMEM;
178
179	mipi_dsi_set_drvdata(dsi, s6);
180	s6->dev = dev;
181
182	dsi->lanes = 2;
183	dsi->format = MIPI_DSI_FMT_RGB888;
184	dsi->hs_rate = 420160000;
185	dsi->lp_rate = 19200000;
186	/*
187	 * This display uses command mode so no MIPI_DSI_MODE_VIDEO
188	 * or MIPI_DSI_MODE_VIDEO_SYNC_PULSE
189	 *
190	 * As we only send commands we do not need to be continuously
191	 * clocked.
192	 */
193	dsi->mode_flags =
194		MIPI_DSI_CLOCK_NON_CONTINUOUS |
195		MIPI_DSI_MODE_EOT_PACKET;
196
197	s6->supply = devm_regulator_get(dev, "vdd1");
198	if (IS_ERR(s6->supply))
199		return PTR_ERR(s6->supply);
200
201	/* This asserts RESET by default */
202	s6->reset_gpio = devm_gpiod_get_optional(dev, "reset",
203						 GPIOD_OUT_HIGH);
204	if (IS_ERR(s6->reset_gpio)) {
205		ret = PTR_ERR(s6->reset_gpio);
206		if (ret != -EPROBE_DEFER)
207			DRM_DEV_ERROR(dev, "failed to request GPIO (%d)\n",
208				      ret);
209		return ret;
210	}
211
212	drm_panel_init(&s6->panel, dev, &s6d16d0_drm_funcs,
213		       DRM_MODE_CONNECTOR_DSI);
214
215	ret = drm_panel_add(&s6->panel);
216	if (ret < 0)
217		return ret;
218
219	ret = mipi_dsi_attach(dsi);
220	if (ret < 0)
221		drm_panel_remove(&s6->panel);
222
223	return ret;
224}
225
226static int s6d16d0_remove(struct mipi_dsi_device *dsi)
227{
228	struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi);
229
230	mipi_dsi_detach(dsi);
231	drm_panel_remove(&s6->panel);
232
233	return 0;
234}
235
236static const struct of_device_id s6d16d0_of_match[] = {
237	{ .compatible = "samsung,s6d16d0" },
238	{ }
239};
240MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
241
242static struct mipi_dsi_driver s6d16d0_driver = {
243	.probe = s6d16d0_probe,
244	.remove = s6d16d0_remove,
245	.driver = {
246		.name = "panel-samsung-s6d16d0",
247		.of_match_table = s6d16d0_of_match,
248	},
249};
250module_mipi_dsi_driver(s6d16d0_driver);
251
252MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
253MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
254MODULE_LICENSE("GPL v2");