1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
// SPDX-License-Identifier: GPL-2.0+
/*
* MIPI-DSI Samsung s6d16d0 panel driver. This is a 864x480
* AMOLED panel with a command-only DSI interface.
*/
#include <drm/drm_modes.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/module.h>
struct s6d16d0 {
struct device *dev;
struct drm_panel panel;
struct regulator *supply;
struct gpio_desc *reset_gpio;
};
/*
* The timings are not very helpful as the display is used in
* command mode.
*/
static const struct drm_display_mode samsung_s6d16d0_mode = {
/* HS clock, (htotal*vtotal*vrefresh)/1000 */
.clock = 420160,
.hdisplay = 864,
.hsync_start = 864 + 154,
.hsync_end = 864 + 154 + 16,
.htotal = 864 + 154 + 16 + 32,
.vdisplay = 480,
.vsync_start = 480 + 1,
.vsync_end = 480 + 1 + 1,
.vtotal = 480 + 1 + 1 + 1,
/*
* This depends on the clocking HS vs LP rate, this value
* is calculated as:
* vrefresh = (clock * 1000) / (htotal*vtotal)
*/
.vrefresh = 816,
.width_mm = 84,
.height_mm = 48,
};
static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel)
{
return container_of(panel, struct s6d16d0, panel);
}
static int s6d16d0_unprepare(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
/* Enter sleep mode */
ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to enter sleep mode (%d)\n",
ret);
return ret;
}
/* Assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 1);
regulator_disable(s6->supply);
return 0;
}
static int s6d16d0_prepare(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = regulator_enable(s6->supply);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to enable supply (%d)\n", ret);
return ret;
}
/* Assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 1);
udelay(10);
/* De-assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 0);
msleep(120);
/* Enabe tearing mode: send TE (tearing effect) at VBLANK */
ret = mipi_dsi_dcs_set_tear_on(dsi,
MIPI_DSI_DCS_TEAR_MODE_VBLANK);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to enable vblank TE (%d)\n",
ret);
return ret;
}
/* Exit sleep mode and power on */
ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to exit sleep mode (%d)\n",
ret);
return ret;
}
return 0;
}
static int s6d16d0_enable(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to turn display on (%d)\n",
ret);
return ret;
}
return 0;
}
static int s6d16d0_disable(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = mipi_dsi_dcs_set_display_off(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to turn display off (%d)\n",
ret);
return ret;
}
return 0;
}
static int s6d16d0_get_modes(struct drm_panel *panel)
{
struct drm_connector *connector = panel->connector;
struct drm_display_mode *mode;
strncpy(connector->display_info.name, "Samsung S6D16D0\0",
DRM_DISPLAY_INFO_LEN);
mode = drm_mode_duplicate(panel->drm, &samsung_s6d16d0_mode);
if (!mode) {
DRM_ERROR("bad mode or failed to add mode\n");
return -EINVAL;
}
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
drm_mode_probed_add(connector, mode);
return 1; /* Number of modes */
}
static const struct drm_panel_funcs s6d16d0_drm_funcs = {
.disable = s6d16d0_disable,
.unprepare = s6d16d0_unprepare,
.prepare = s6d16d0_prepare,
.enable = s6d16d0_enable,
.get_modes = s6d16d0_get_modes,
};
static int s6d16d0_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct s6d16d0 *s6;
int ret;
s6 = devm_kzalloc(dev, sizeof(struct s6d16d0), GFP_KERNEL);
if (!s6)
return -ENOMEM;
mipi_dsi_set_drvdata(dsi, s6);
s6->dev = dev;
dsi->lanes = 2;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->hs_rate = 420160000;
dsi->lp_rate = 19200000;
/*
* This display uses command mode so no MIPI_DSI_MODE_VIDEO
* or MIPI_DSI_MODE_VIDEO_SYNC_PULSE
*
* As we only send commands we do not need to be continuously
* clocked.
*/
dsi->mode_flags =
MIPI_DSI_CLOCK_NON_CONTINUOUS |
MIPI_DSI_MODE_EOT_PACKET;
s6->supply = devm_regulator_get(dev, "vdd1");
if (IS_ERR(s6->supply))
return PTR_ERR(s6->supply);
/* This asserts RESET by default */
s6->reset_gpio = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(s6->reset_gpio)) {
ret = PTR_ERR(s6->reset_gpio);
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev, "failed to request GPIO (%d)\n",
ret);
return ret;
}
drm_panel_init(&s6->panel);
s6->panel.dev = dev;
s6->panel.funcs = &s6d16d0_drm_funcs;
ret = drm_panel_add(&s6->panel);
if (ret < 0)
return ret;
ret = mipi_dsi_attach(dsi);
if (ret < 0)
drm_panel_remove(&s6->panel);
return ret;
}
static int s6d16d0_remove(struct mipi_dsi_device *dsi)
{
struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi);
mipi_dsi_detach(dsi);
drm_panel_remove(&s6->panel);
return 0;
}
static const struct of_device_id s6d16d0_of_match[] = {
{ .compatible = "samsung,s6d16d0" },
{ }
};
MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
static struct mipi_dsi_driver s6d16d0_driver = {
.probe = s6d16d0_probe,
.remove = s6d16d0_remove,
.driver = {
.name = "panel-samsung-s6d16d0",
.of_match_table = s6d16d0_of_match,
},
};
module_mipi_dsi_driver(s6d16d0_driver);
MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
MODULE_LICENSE("GPL v2");
|
