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	/*
 41	 * This depends on the clocking HS vs LP rate, this value
 42	 * is calculated as:
 43	 * vrefresh = (clock * 1000) / (htotal*vtotal)
 44	 */
 45	.vrefresh = 816,
 46	.width_mm = 84,
 47	.height_mm = 48,
 48};
 49
 50static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel)
 51{
 52	return container_of(panel, struct s6d16d0, panel);
 53}
 54
 55static int s6d16d0_unprepare(struct drm_panel *panel)
 56{
 57	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
 58	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
 59	int ret;
 60
 61	/* Enter sleep mode */
 62	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
 63	if (ret) {
 64		DRM_DEV_ERROR(s6->dev, "failed to enter sleep mode (%d)\n",
 65			      ret);
 66		return ret;
 67	}
 68
 69	/* Assert RESET */
 70	gpiod_set_value_cansleep(s6->reset_gpio, 1);
 71	regulator_disable(s6->supply);
 72
 73	return 0;
 74}
 75
 76static int s6d16d0_prepare(struct drm_panel *panel)
 77{
 78	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
 79	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
 80	int ret;
 81
 82	ret = regulator_enable(s6->supply);
 83	if (ret) {
 84		DRM_DEV_ERROR(s6->dev, "failed to enable supply (%d)\n", ret);
 85		return ret;
 86	}
 87
 88	/* Assert RESET */
 89	gpiod_set_value_cansleep(s6->reset_gpio, 1);
 90	udelay(10);
 91	/* De-assert RESET */
 92	gpiod_set_value_cansleep(s6->reset_gpio, 0);
 93	msleep(120);
 94
 95	/* Enabe tearing mode: send TE (tearing effect) at VBLANK */
 96	ret = mipi_dsi_dcs_set_tear_on(dsi,
 97				       MIPI_DSI_DCS_TEAR_MODE_VBLANK);
 98	if (ret) {
 99		DRM_DEV_ERROR(s6->dev, "failed to enable vblank TE (%d)\n",
100			      ret);
101		return ret;
102	}
103	/* Exit sleep mode and power on */
104	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
105	if (ret) {
106		DRM_DEV_ERROR(s6->dev, "failed to exit sleep mode (%d)\n",
107			      ret);
108		return ret;
109	}
110
111	return 0;
112}
113
114static int s6d16d0_enable(struct drm_panel *panel)
115{
116	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
117	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
118	int ret;
119
120	ret = mipi_dsi_dcs_set_display_on(dsi);
121	if (ret) {
122		DRM_DEV_ERROR(s6->dev, "failed to turn display on (%d)\n",
123			      ret);
124		return ret;
125	}
126
127	return 0;
128}
129
130static int s6d16d0_disable(struct drm_panel *panel)
131{
132	struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
133	struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
134	int ret;
135
136	ret = mipi_dsi_dcs_set_display_off(dsi);
137	if (ret) {
138		DRM_DEV_ERROR(s6->dev, "failed to turn display off (%d)\n",
139			      ret);
140		return ret;
141	}
142
143	return 0;
144}
145
146static int s6d16d0_get_modes(struct drm_panel *panel)
147{
148	struct drm_connector *connector = panel->connector;
149	struct drm_display_mode *mode;
150
151	mode = drm_mode_duplicate(panel->drm, &samsung_s6d16d0_mode);
152	if (!mode) {
153		DRM_ERROR("bad mode or failed to add mode\n");
154		return -EINVAL;
155	}
156	drm_mode_set_name(mode);
157	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
158
159	connector->display_info.width_mm = mode->width_mm;
160	connector->display_info.height_mm = mode->height_mm;
161
162	drm_mode_probed_add(connector, mode);
163
164	return 1; /* Number of modes */
165}
166
167static const struct drm_panel_funcs s6d16d0_drm_funcs = {
168	.disable = s6d16d0_disable,
169	.unprepare = s6d16d0_unprepare,
170	.prepare = s6d16d0_prepare,
171	.enable = s6d16d0_enable,
172	.get_modes = s6d16d0_get_modes,
173};
174
175static int s6d16d0_probe(struct mipi_dsi_device *dsi)
176{
177	struct device *dev = &dsi->dev;
178	struct s6d16d0 *s6;
179	int ret;
180
181	s6 = devm_kzalloc(dev, sizeof(struct s6d16d0), GFP_KERNEL);
182	if (!s6)
183		return -ENOMEM;
184
185	mipi_dsi_set_drvdata(dsi, s6);
186	s6->dev = dev;
187
188	dsi->lanes = 2;
189	dsi->format = MIPI_DSI_FMT_RGB888;
190	dsi->hs_rate = 420160000;
191	dsi->lp_rate = 19200000;
192	/*
193	 * This display uses command mode so no MIPI_DSI_MODE_VIDEO
194	 * or MIPI_DSI_MODE_VIDEO_SYNC_PULSE
195	 *
196	 * As we only send commands we do not need to be continuously
197	 * clocked.
198	 */
199	dsi->mode_flags =
200		MIPI_DSI_CLOCK_NON_CONTINUOUS |
201		MIPI_DSI_MODE_EOT_PACKET;
202
203	s6->supply = devm_regulator_get(dev, "vdd1");
204	if (IS_ERR(s6->supply))
205		return PTR_ERR(s6->supply);
206
207	/* This asserts RESET by default */
208	s6->reset_gpio = devm_gpiod_get_optional(dev, "reset",
209						 GPIOD_OUT_HIGH);
210	if (IS_ERR(s6->reset_gpio)) {
211		ret = PTR_ERR(s6->reset_gpio);
212		if (ret != -EPROBE_DEFER)
213			DRM_DEV_ERROR(dev, "failed to request GPIO (%d)\n",
214				      ret);
215		return ret;
216	}
217
218	drm_panel_init(&s6->panel);
219	s6->panel.dev = dev;
220	s6->panel.funcs = &s6d16d0_drm_funcs;
221
222	ret = drm_panel_add(&s6->panel);
223	if (ret < 0)
224		return ret;
225
226	ret = mipi_dsi_attach(dsi);
227	if (ret < 0)
228		drm_panel_remove(&s6->panel);
229
230	return ret;
231}
232
233static int s6d16d0_remove(struct mipi_dsi_device *dsi)
234{
235	struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi);
236
237	mipi_dsi_detach(dsi);
238	drm_panel_remove(&s6->panel);
239
240	return 0;
241}
242
243static const struct of_device_id s6d16d0_of_match[] = {
244	{ .compatible = "samsung,s6d16d0" },
245	{ }
246};
247MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
248
249static struct mipi_dsi_driver s6d16d0_driver = {
250	.probe = s6d16d0_probe,
251	.remove = s6d16d0_remove,
252	.driver = {
253		.name = "panel-samsung-s6d16d0",
254		.of_match_table = s6d16d0_of_match,
255	},
256};
257module_mipi_dsi_driver(s6d16d0_driver);
258
259MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
260MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
261MODULE_LICENSE("GPL v2");