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