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
18 struct 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 */
29 static 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
panel_to_s6d16d0(struct drm_panel * panel)50 static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel)
51 {
52 return container_of(panel, struct s6d16d0, panel);
53 }
54
s6d16d0_unprepare(struct drm_panel * panel)55 static 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
s6d16d0_prepare(struct drm_panel * panel)76 static 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
s6d16d0_enable(struct drm_panel * panel)114 static 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
s6d16d0_disable(struct drm_panel * panel)130 static 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
s6d16d0_get_modes(struct drm_panel * panel)146 static 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
167 static 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
s6d16d0_probe(struct mipi_dsi_device * dsi)175 static 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
s6d16d0_remove(struct mipi_dsi_device * dsi)233 static 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
243 static const struct of_device_id s6d16d0_of_match[] = {
244 { .compatible = "samsung,s6d16d0" },
245 { }
246 };
247 MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
248
249 static 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 };
257 module_mipi_dsi_driver(s6d16d0_driver);
258
259 MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
260 MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
261 MODULE_LICENSE("GPL v2");
262
