1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015 Red Hat
4 * Copyright (C) 2015 Sony Mobile Communications Inc.
5 * Author: Werner Johansson <werner.johansson@sonymobile.com>
7 * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
10 #include <linux/backlight.h>
11 #include <linux/delay.h>
12 #include <linux/module.h>
14 #include <linux/regulator/consumer.h>
16 #include <video/mipi_display.h>
18 #include <drm/drm_crtc.h>
19 #include <drm/drm_device.h>
20 #include <drm/drm_mipi_dsi.h>
21 #include <drm/drm_panel.h>
24 * When power is turned off to this panel a minimum off time of 500ms has to be
25 * observed before powering back on as there's no external reset pin. Keep
26 * track of earliest wakeup time and delay subsequent prepare call accordingly
28 #define MIN_POFF_MS (500)
30 struct wuxga_nt_panel {
31 struct drm_panel base;
32 struct mipi_dsi_device *dsi;
34 struct backlight_device *backlight;
35 struct regulator *supply;
40 ktime_t earliest_wake;
42 const struct drm_display_mode *mode;
45 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
47 return container_of(panel, struct wuxga_nt_panel, base);
50 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
52 return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
55 static int wuxga_nt_panel_disable(struct drm_panel *panel)
57 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
58 int mipi_ret, bl_ret = 0;
60 if (!wuxga_nt->enabled)
63 mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
65 if (wuxga_nt->backlight) {
66 wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN;
67 wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK;
68 bl_ret = backlight_update_status(wuxga_nt->backlight);
71 wuxga_nt->enabled = false;
73 return mipi_ret ? mipi_ret : bl_ret;
76 static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
78 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
80 if (!wuxga_nt->prepared)
83 regulator_disable(wuxga_nt->supply);
84 wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
85 wuxga_nt->prepared = false;
90 static int wuxga_nt_panel_prepare(struct drm_panel *panel)
92 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
96 if (wuxga_nt->prepared)
100 * If the user re-enabled the panel before the required off-time then
101 * we need to wait the remaining period before re-enabling regulator
103 enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
105 /* Sanity check, this should never happen */
106 if (enablewait > MIN_POFF_MS)
107 enablewait = MIN_POFF_MS;
112 ret = regulator_enable(wuxga_nt->supply);
117 * A minimum delay of 250ms is required after power-up until commands
122 ret = wuxga_nt_panel_on(wuxga_nt);
124 dev_err(panel->dev, "failed to set panel on: %d\n", ret);
128 wuxga_nt->prepared = true;
133 regulator_disable(wuxga_nt->supply);
138 static int wuxga_nt_panel_enable(struct drm_panel *panel)
140 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
142 if (wuxga_nt->enabled)
145 if (wuxga_nt->backlight) {
146 wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK;
147 wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK;
148 backlight_update_status(wuxga_nt->backlight);
151 wuxga_nt->enabled = true;
156 static const struct drm_display_mode default_mode = {
159 .hsync_start = 1920 + 152,
160 .hsync_end = 1920 + 152 + 52,
161 .htotal = 1920 + 152 + 52 + 20,
163 .vsync_start = 1200 + 24,
164 .vsync_end = 1200 + 24 + 6,
165 .vtotal = 1200 + 24 + 6 + 48,
169 static int wuxga_nt_panel_get_modes(struct drm_panel *panel)
171 struct drm_display_mode *mode;
173 mode = drm_mode_duplicate(panel->drm, &default_mode);
175 dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
176 default_mode.hdisplay, default_mode.vdisplay,
177 default_mode.vrefresh);
181 drm_mode_set_name(mode);
183 drm_mode_probed_add(panel->connector, mode);
185 panel->connector->display_info.width_mm = 217;
186 panel->connector->display_info.height_mm = 136;
191 static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
192 .disable = wuxga_nt_panel_disable,
193 .unprepare = wuxga_nt_panel_unprepare,
194 .prepare = wuxga_nt_panel_prepare,
195 .enable = wuxga_nt_panel_enable,
196 .get_modes = wuxga_nt_panel_get_modes,
199 static const struct of_device_id wuxga_nt_of_match[] = {
200 { .compatible = "panasonic,vvx10f034n00", },
203 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
205 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
207 struct device *dev = &wuxga_nt->dsi->dev;
208 struct device_node *np;
211 wuxga_nt->mode = &default_mode;
213 wuxga_nt->supply = devm_regulator_get(dev, "power");
214 if (IS_ERR(wuxga_nt->supply))
215 return PTR_ERR(wuxga_nt->supply);
217 np = of_parse_phandle(dev->of_node, "backlight", 0);
219 wuxga_nt->backlight = of_find_backlight_by_node(np);
222 if (!wuxga_nt->backlight)
223 return -EPROBE_DEFER;
226 drm_panel_init(&wuxga_nt->base);
227 wuxga_nt->base.funcs = &wuxga_nt_panel_funcs;
228 wuxga_nt->base.dev = &wuxga_nt->dsi->dev;
230 ret = drm_panel_add(&wuxga_nt->base);
237 if (wuxga_nt->backlight)
238 put_device(&wuxga_nt->backlight->dev);
243 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
245 if (wuxga_nt->base.dev)
246 drm_panel_remove(&wuxga_nt->base);
248 if (wuxga_nt->backlight)
249 put_device(&wuxga_nt->backlight->dev);
252 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
254 struct wuxga_nt_panel *wuxga_nt;
258 dsi->format = MIPI_DSI_FMT_RGB888;
259 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
260 MIPI_DSI_MODE_VIDEO_HSE |
261 MIPI_DSI_CLOCK_NON_CONTINUOUS |
264 wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
268 mipi_dsi_set_drvdata(dsi, wuxga_nt);
272 ret = wuxga_nt_panel_add(wuxga_nt);
276 return mipi_dsi_attach(dsi);
279 static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
281 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
284 ret = wuxga_nt_panel_disable(&wuxga_nt->base);
286 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
288 ret = mipi_dsi_detach(dsi);
290 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
292 wuxga_nt_panel_del(wuxga_nt);
297 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
299 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
301 wuxga_nt_panel_disable(&wuxga_nt->base);
304 static struct mipi_dsi_driver wuxga_nt_panel_driver = {
306 .name = "panel-panasonic-vvx10f034n00",
307 .of_match_table = wuxga_nt_of_match,
309 .probe = wuxga_nt_panel_probe,
310 .remove = wuxga_nt_panel_remove,
311 .shutdown = wuxga_nt_panel_shutdown,
313 module_mipi_dsi_driver(wuxga_nt_panel_driver);
315 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
316 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
317 MODULE_LICENSE("GPL v2");