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/module.h>
13 #include <linux/regulator/consumer.h>
16 #include <drm/drm_crtc.h>
17 #include <drm/drm_mipi_dsi.h>
18 #include <drm/drm_panel.h>
20 #include <video/mipi_display.h>
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
27 #define MIN_POFF_MS (500)
29 struct wuxga_nt_panel {
30 struct drm_panel base;
31 struct mipi_dsi_device *dsi;
33 struct backlight_device *backlight;
34 struct regulator *supply;
39 ktime_t earliest_wake;
41 const struct drm_display_mode *mode;
44 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
46 return container_of(panel, struct wuxga_nt_panel, base);
49 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
51 return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
54 static int wuxga_nt_panel_disable(struct drm_panel *panel)
56 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
57 int mipi_ret, bl_ret = 0;
59 if (!wuxga_nt->enabled)
62 mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
64 if (wuxga_nt->backlight) {
65 wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN;
66 wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK;
67 bl_ret = backlight_update_status(wuxga_nt->backlight);
70 wuxga_nt->enabled = false;
72 return mipi_ret ? mipi_ret : bl_ret;
75 static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
77 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
79 if (!wuxga_nt->prepared)
82 regulator_disable(wuxga_nt->supply);
83 wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
84 wuxga_nt->prepared = false;
89 static int wuxga_nt_panel_prepare(struct drm_panel *panel)
91 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
95 if (wuxga_nt->prepared)
99 * If the user re-enabled the panel before the required off-time then
100 * we need to wait the remaining period before re-enabling regulator
102 enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
104 /* Sanity check, this should never happen */
105 if (enablewait > MIN_POFF_MS)
106 enablewait = MIN_POFF_MS;
111 ret = regulator_enable(wuxga_nt->supply);
116 * A minimum delay of 250ms is required after power-up until commands
121 ret = wuxga_nt_panel_on(wuxga_nt);
123 dev_err(panel->dev, "failed to set panel on: %d\n", ret);
127 wuxga_nt->prepared = true;
132 regulator_disable(wuxga_nt->supply);
137 static int wuxga_nt_panel_enable(struct drm_panel *panel)
139 struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
141 if (wuxga_nt->enabled)
144 if (wuxga_nt->backlight) {
145 wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK;
146 wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK;
147 backlight_update_status(wuxga_nt->backlight);
150 wuxga_nt->enabled = true;
155 static const struct drm_display_mode default_mode = {
158 .hsync_start = 1920 + 152,
159 .hsync_end = 1920 + 152 + 52,
160 .htotal = 1920 + 152 + 52 + 20,
162 .vsync_start = 1200 + 24,
163 .vsync_end = 1200 + 24 + 6,
164 .vtotal = 1200 + 24 + 6 + 48,
168 static int wuxga_nt_panel_get_modes(struct drm_panel *panel)
170 struct drm_display_mode *mode;
172 mode = drm_mode_duplicate(panel->drm, &default_mode);
174 dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
175 default_mode.hdisplay, default_mode.vdisplay,
176 default_mode.vrefresh);
180 drm_mode_set_name(mode);
182 drm_mode_probed_add(panel->connector, mode);
184 panel->connector->display_info.width_mm = 217;
185 panel->connector->display_info.height_mm = 136;
190 static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
191 .disable = wuxga_nt_panel_disable,
192 .unprepare = wuxga_nt_panel_unprepare,
193 .prepare = wuxga_nt_panel_prepare,
194 .enable = wuxga_nt_panel_enable,
195 .get_modes = wuxga_nt_panel_get_modes,
198 static const struct of_device_id wuxga_nt_of_match[] = {
199 { .compatible = "panasonic,vvx10f034n00", },
202 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
204 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
206 struct device *dev = &wuxga_nt->dsi->dev;
207 struct device_node *np;
210 wuxga_nt->mode = &default_mode;
212 wuxga_nt->supply = devm_regulator_get(dev, "power");
213 if (IS_ERR(wuxga_nt->supply))
214 return PTR_ERR(wuxga_nt->supply);
216 np = of_parse_phandle(dev->of_node, "backlight", 0);
218 wuxga_nt->backlight = of_find_backlight_by_node(np);
221 if (!wuxga_nt->backlight)
222 return -EPROBE_DEFER;
225 drm_panel_init(&wuxga_nt->base);
226 wuxga_nt->base.funcs = &wuxga_nt_panel_funcs;
227 wuxga_nt->base.dev = &wuxga_nt->dsi->dev;
229 ret = drm_panel_add(&wuxga_nt->base);
236 if (wuxga_nt->backlight)
237 put_device(&wuxga_nt->backlight->dev);
242 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
244 if (wuxga_nt->base.dev)
245 drm_panel_remove(&wuxga_nt->base);
247 if (wuxga_nt->backlight)
248 put_device(&wuxga_nt->backlight->dev);
251 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
253 struct wuxga_nt_panel *wuxga_nt;
257 dsi->format = MIPI_DSI_FMT_RGB888;
258 dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
259 MIPI_DSI_MODE_VIDEO_HSE |
260 MIPI_DSI_CLOCK_NON_CONTINUOUS |
263 wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
267 mipi_dsi_set_drvdata(dsi, wuxga_nt);
271 ret = wuxga_nt_panel_add(wuxga_nt);
275 return mipi_dsi_attach(dsi);
278 static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
280 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
283 ret = wuxga_nt_panel_disable(&wuxga_nt->base);
285 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
287 ret = mipi_dsi_detach(dsi);
289 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
291 wuxga_nt_panel_del(wuxga_nt);
296 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
298 struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
300 wuxga_nt_panel_disable(&wuxga_nt->base);
303 static struct mipi_dsi_driver wuxga_nt_panel_driver = {
305 .name = "panel-panasonic-vvx10f034n00",
306 .of_match_table = wuxga_nt_of_match,
308 .probe = wuxga_nt_panel_probe,
309 .remove = wuxga_nt_panel_remove,
310 .shutdown = wuxga_nt_panel_shutdown,
312 module_mipi_dsi_driver(wuxga_nt_panel_driver);
314 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
315 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
316 MODULE_LICENSE("GPL v2");