1
2
3
4
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/of_device.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
26
27
28static const struct drm_display_mode samsung_s6d16d0_mode = {
29
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
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
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
81 gpiod_set_value_cansleep(s6->reset_gpio, 1);
82 udelay(10);
83
84 gpiod_set_value_cansleep(s6->reset_gpio, 0);
85 msleep(120);
86
87
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
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;
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
182
183
184
185
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
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 int 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 return 0;
223}
224
225static const struct of_device_id s6d16d0_of_match[] = {
226 { .compatible = "samsung,s6d16d0" },
227 { }
228};
229MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
230
231static struct mipi_dsi_driver s6d16d0_driver = {
232 .probe = s6d16d0_probe,
233 .remove = s6d16d0_remove,
234 .driver = {
235 .name = "panel-samsung-s6d16d0",
236 .of_match_table = s6d16d0_of_match,
237 },
238};
239module_mipi_dsi_driver(s6d16d0_driver);
240
241MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
242MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
243MODULE_LICENSE("GPL v2");
244
