1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2015 Red Hat
4 * Copyright (C) 2015 Sony Mobile Communications Inc.
5 * Author: Werner Johansson <werner.johansson@sonymobile.com>
6 *
7 * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
8 */
9
10 #include <linux/delay.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/regulator/consumer.h>
14
15 #include <video/mipi_display.h>
16
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_device.h>
19 #include <drm/drm_mipi_dsi.h>
20 #include <drm/drm_panel.h>
21
22 /*
23 * When power is turned off to this panel a minimum off time of 500ms has to be
24 * observed before powering back on as there's no external reset pin. Keep
25 * track of earliest wakeup time and delay subsequent prepare call accordingly
26 */
27 #define MIN_POFF_MS (500)
28
29 struct wuxga_nt_panel {
30 struct drm_panel base;
31 struct mipi_dsi_device *dsi;
32
33 struct regulator *supply;
34
35 ktime_t earliest_wake;
36
37 const struct drm_display_mode *mode;
38 };
39
to_wuxga_nt_panel(struct drm_panel * panel)40 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
41 {
42 return container_of(panel, struct wuxga_nt_panel, base);
43 }
44
wuxga_nt_panel_on(struct wuxga_nt_panel * wuxga_nt)45 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
46 {
47 return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
48 }
49
wuxga_nt_panel_disable(struct drm_panel * panel)50 static int wuxga_nt_panel_disable(struct drm_panel *panel)
51 {
52 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
53
54 return mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
55 }
56
wuxga_nt_panel_unprepare(struct drm_panel * panel)57 static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
58 {
59 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
60
61 regulator_disable(wuxga_nt->supply);
62 wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
63
64 return 0;
65 }
66
wuxga_nt_panel_prepare(struct drm_panel * panel)67 static int wuxga_nt_panel_prepare(struct drm_panel *panel)
68 {
69 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
70 int ret;
71 s64 enablewait;
72
73 /*
74 * If the user re-enabled the panel before the required off-time then
75 * we need to wait the remaining period before re-enabling regulator
76 */
77 enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
78
79 /* Sanity check, this should never happen */
80 if (enablewait > MIN_POFF_MS)
81 enablewait = MIN_POFF_MS;
82
83 if (enablewait > 0)
84 msleep(enablewait);
85
86 ret = regulator_enable(wuxga_nt->supply);
87 if (ret < 0)
88 return ret;
89
90 /*
91 * A minimum delay of 250ms is required after power-up until commands
92 * can be sent
93 */
94 msleep(250);
95
96 ret = wuxga_nt_panel_on(wuxga_nt);
97 if (ret < 0) {
98 dev_err(panel->dev, "failed to set panel on: %d\n", ret);
99 goto poweroff;
100 }
101
102 return 0;
103
104 poweroff:
105 regulator_disable(wuxga_nt->supply);
106
107 return ret;
108 }
109
110 static const struct drm_display_mode default_mode = {
111 .clock = 164402,
112 .hdisplay = 1920,
113 .hsync_start = 1920 + 152,
114 .hsync_end = 1920 + 152 + 52,
115 .htotal = 1920 + 152 + 52 + 20,
116 .vdisplay = 1200,
117 .vsync_start = 1200 + 24,
118 .vsync_end = 1200 + 24 + 6,
119 .vtotal = 1200 + 24 + 6 + 48,
120 };
121
wuxga_nt_panel_get_modes(struct drm_panel * panel,struct drm_connector * connector)122 static int wuxga_nt_panel_get_modes(struct drm_panel *panel,
123 struct drm_connector *connector)
124 {
125 struct drm_display_mode *mode;
126
127 mode = drm_mode_duplicate(connector->dev, &default_mode);
128 if (!mode) {
129 dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
130 default_mode.hdisplay, default_mode.vdisplay,
131 drm_mode_vrefresh(&default_mode));
132 return -ENOMEM;
133 }
134
135 drm_mode_set_name(mode);
136
137 drm_mode_probed_add(connector, mode);
138
139 connector->display_info.width_mm = 217;
140 connector->display_info.height_mm = 136;
141
142 return 1;
143 }
144
145 static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
146 .disable = wuxga_nt_panel_disable,
147 .unprepare = wuxga_nt_panel_unprepare,
148 .prepare = wuxga_nt_panel_prepare,
149 .get_modes = wuxga_nt_panel_get_modes,
150 };
151
152 static const struct of_device_id wuxga_nt_of_match[] = {
153 { .compatible = "panasonic,vvx10f034n00", },
154 { }
155 };
156 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
157
wuxga_nt_panel_add(struct wuxga_nt_panel * wuxga_nt)158 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
159 {
160 struct device *dev = &wuxga_nt->dsi->dev;
161 int ret;
162
163 wuxga_nt->mode = &default_mode;
164
165 wuxga_nt->supply = devm_regulator_get(dev, "power");
166 if (IS_ERR(wuxga_nt->supply))
167 return PTR_ERR(wuxga_nt->supply);
168
169 drm_panel_init(&wuxga_nt->base, &wuxga_nt->dsi->dev,
170 &wuxga_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
171
172 ret = drm_panel_of_backlight(&wuxga_nt->base);
173 if (ret)
174 return ret;
175
176 drm_panel_add(&wuxga_nt->base);
177
178 return 0;
179 }
180
wuxga_nt_panel_del(struct wuxga_nt_panel * wuxga_nt)181 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
182 {
183 if (wuxga_nt->base.dev)
184 drm_panel_remove(&wuxga_nt->base);
185 }
186
wuxga_nt_panel_probe(struct mipi_dsi_device * dsi)187 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
188 {
189 struct wuxga_nt_panel *wuxga_nt;
190 int ret;
191
192 dsi->lanes = 4;
193 dsi->format = MIPI_DSI_FMT_RGB888;
194 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
195 MIPI_DSI_MODE_VIDEO_HSE |
196 MIPI_DSI_CLOCK_NON_CONTINUOUS |
197 MIPI_DSI_MODE_LPM;
198
199 wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
200 if (!wuxga_nt)
201 return -ENOMEM;
202
203 mipi_dsi_set_drvdata(dsi, wuxga_nt);
204
205 wuxga_nt->dsi = dsi;
206
207 ret = wuxga_nt_panel_add(wuxga_nt);
208 if (ret < 0)
209 return ret;
210
211 ret = mipi_dsi_attach(dsi);
212 if (ret < 0) {
213 wuxga_nt_panel_del(wuxga_nt);
214 return ret;
215 }
216
217 return 0;
218 }
219
wuxga_nt_panel_remove(struct mipi_dsi_device * dsi)220 static void wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
221 {
222 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
223 int ret;
224
225 ret = mipi_dsi_detach(dsi);
226 if (ret < 0)
227 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
228
229 wuxga_nt_panel_del(wuxga_nt);
230 }
231
232 static struct mipi_dsi_driver wuxga_nt_panel_driver = {
233 .driver = {
234 .name = "panel-panasonic-vvx10f034n00",
235 .of_match_table = wuxga_nt_of_match,
236 },
237 .probe = wuxga_nt_panel_probe,
238 .remove = wuxga_nt_panel_remove,
239 };
240 module_mipi_dsi_driver(wuxga_nt_panel_driver);
241
242 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
243 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
244 MODULE_LICENSE("GPL v2");
245