1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2017 NXP Semiconductors.
4 * Author: Marco Franchi <marco.franchi@nxp.com>
6 * Based on Panel Simple driver by Thierry Reding <treding@nvidia.com>
9 #include <linux/backlight.h>
10 #include <linux/module.h>
12 #include <linux/regulator/consumer.h>
15 #include <drm/drm_crtc.h>
16 #include <drm/drm_panel.h>
18 #include <video/display_timing.h>
19 #include <video/videomode.h>
21 struct seiko_panel_desc {
22 const struct drm_display_mode *modes;
23 unsigned int num_modes;
24 const struct display_timing *timings;
25 unsigned int num_timings;
30 * @width: width (in millimeters) of the panel's active display area
31 * @height: height (in millimeters) of the panel's active display area
43 struct drm_panel base;
46 const struct seiko_panel_desc *desc;
47 struct backlight_device *backlight;
48 struct regulator *dvdd;
49 struct regulator *avdd;
52 static inline struct seiko_panel *to_seiko_panel(struct drm_panel *panel)
54 return container_of(panel, struct seiko_panel, base);
57 static int seiko_panel_get_fixed_modes(struct seiko_panel *panel)
59 struct drm_connector *connector = panel->base.connector;
60 struct drm_device *drm = panel->base.drm;
61 struct drm_display_mode *mode;
62 unsigned int i, num = 0;
67 for (i = 0; i < panel->desc->num_timings; i++) {
68 const struct display_timing *dt = &panel->desc->timings[i];
71 videomode_from_timing(dt, &vm);
72 mode = drm_mode_create(drm);
74 dev_err(drm->dev, "failed to add mode %ux%u\n",
75 dt->hactive.typ, dt->vactive.typ);
79 drm_display_mode_from_videomode(&vm, mode);
81 mode->type |= DRM_MODE_TYPE_DRIVER;
83 if (panel->desc->num_timings == 1)
84 mode->type |= DRM_MODE_TYPE_PREFERRED;
86 drm_mode_probed_add(connector, mode);
90 for (i = 0; i < panel->desc->num_modes; i++) {
91 const struct drm_display_mode *m = &panel->desc->modes[i];
93 mode = drm_mode_duplicate(drm, m);
95 dev_err(drm->dev, "failed to add mode %ux%u@%u\n",
96 m->hdisplay, m->vdisplay, m->vrefresh);
100 mode->type |= DRM_MODE_TYPE_DRIVER;
102 if (panel->desc->num_modes == 1)
103 mode->type |= DRM_MODE_TYPE_PREFERRED;
105 drm_mode_set_name(mode);
107 drm_mode_probed_add(connector, mode);
111 connector->display_info.bpc = panel->desc->bpc;
112 connector->display_info.width_mm = panel->desc->size.width;
113 connector->display_info.height_mm = panel->desc->size.height;
114 if (panel->desc->bus_format)
115 drm_display_info_set_bus_formats(&connector->display_info,
116 &panel->desc->bus_format, 1);
117 connector->display_info.bus_flags = panel->desc->bus_flags;
122 static int seiko_panel_disable(struct drm_panel *panel)
124 struct seiko_panel *p = to_seiko_panel(panel);
130 p->backlight->props.power = FB_BLANK_POWERDOWN;
131 p->backlight->props.state |= BL_CORE_FBBLANK;
132 backlight_update_status(p->backlight);
140 static int seiko_panel_unprepare(struct drm_panel *panel)
142 struct seiko_panel *p = to_seiko_panel(panel);
147 regulator_disable(p->avdd);
149 /* Add a 100ms delay as per the panel datasheet */
152 regulator_disable(p->dvdd);
159 static int seiko_panel_prepare(struct drm_panel *panel)
161 struct seiko_panel *p = to_seiko_panel(panel);
167 err = regulator_enable(p->dvdd);
169 dev_err(panel->dev, "failed to enable dvdd: %d\n", err);
173 /* Add a 100ms delay as per the panel datasheet */
176 err = regulator_enable(p->avdd);
178 dev_err(panel->dev, "failed to enable avdd: %d\n", err);
187 regulator_disable(p->dvdd);
191 static int seiko_panel_enable(struct drm_panel *panel)
193 struct seiko_panel *p = to_seiko_panel(panel);
199 p->backlight->props.state &= ~BL_CORE_FBBLANK;
200 p->backlight->props.power = FB_BLANK_UNBLANK;
201 backlight_update_status(p->backlight);
209 static int seiko_panel_get_modes(struct drm_panel *panel)
211 struct seiko_panel *p = to_seiko_panel(panel);
213 /* add hard-coded panel modes */
214 return seiko_panel_get_fixed_modes(p);
217 static int seiko_panel_get_timings(struct drm_panel *panel,
218 unsigned int num_timings,
219 struct display_timing *timings)
221 struct seiko_panel *p = to_seiko_panel(panel);
224 if (p->desc->num_timings < num_timings)
225 num_timings = p->desc->num_timings;
228 for (i = 0; i < num_timings; i++)
229 timings[i] = p->desc->timings[i];
231 return p->desc->num_timings;
234 static const struct drm_panel_funcs seiko_panel_funcs = {
235 .disable = seiko_panel_disable,
236 .unprepare = seiko_panel_unprepare,
237 .prepare = seiko_panel_prepare,
238 .enable = seiko_panel_enable,
239 .get_modes = seiko_panel_get_modes,
240 .get_timings = seiko_panel_get_timings,
243 static int seiko_panel_probe(struct device *dev,
244 const struct seiko_panel_desc *desc)
246 struct device_node *backlight;
247 struct seiko_panel *panel;
250 panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
254 panel->enabled = false;
255 panel->prepared = false;
258 panel->dvdd = devm_regulator_get(dev, "dvdd");
259 if (IS_ERR(panel->dvdd))
260 return PTR_ERR(panel->dvdd);
262 panel->avdd = devm_regulator_get(dev, "avdd");
263 if (IS_ERR(panel->avdd))
264 return PTR_ERR(panel->avdd);
266 backlight = of_parse_phandle(dev->of_node, "backlight", 0);
268 panel->backlight = of_find_backlight_by_node(backlight);
269 of_node_put(backlight);
271 if (!panel->backlight)
272 return -EPROBE_DEFER;
275 drm_panel_init(&panel->base);
276 panel->base.dev = dev;
277 panel->base.funcs = &seiko_panel_funcs;
279 err = drm_panel_add(&panel->base);
283 dev_set_drvdata(dev, panel);
288 static int seiko_panel_remove(struct platform_device *pdev)
290 struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
292 drm_panel_remove(&panel->base);
294 seiko_panel_disable(&panel->base);
296 if (panel->backlight)
297 put_device(&panel->backlight->dev);
302 static void seiko_panel_shutdown(struct platform_device *pdev)
304 struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
306 seiko_panel_disable(&panel->base);
309 static const struct display_timing seiko_43wvf1g_timing = {
310 .pixelclock = { 33500000, 33500000, 33500000 },
311 .hactive = { 800, 800, 800 },
312 .hfront_porch = { 164, 164, 164 },
313 .hback_porch = { 89, 89, 89 },
314 .hsync_len = { 10, 10, 10 },
315 .vactive = { 480, 480, 480 },
316 .vfront_porch = { 10, 10, 10 },
317 .vback_porch = { 23, 23, 23 },
318 .vsync_len = { 10, 10, 10 },
319 .flags = DISPLAY_FLAGS_DE_LOW,
322 static const struct seiko_panel_desc seiko_43wvf1g = {
323 .timings = &seiko_43wvf1g_timing,
330 .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
331 .bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_NEGEDGE,
334 static const struct of_device_id platform_of_match[] = {
336 .compatible = "sii,43wvf1g",
337 .data = &seiko_43wvf1g,
342 MODULE_DEVICE_TABLE(of, platform_of_match);
344 static int seiko_panel_platform_probe(struct platform_device *pdev)
346 const struct of_device_id *id;
348 id = of_match_node(platform_of_match, pdev->dev.of_node);
352 return seiko_panel_probe(&pdev->dev, id->data);
355 static struct platform_driver seiko_panel_platform_driver = {
357 .name = "seiko_panel",
358 .of_match_table = platform_of_match,
360 .probe = seiko_panel_platform_probe,
361 .remove = seiko_panel_remove,
362 .shutdown = seiko_panel_shutdown,
364 module_platform_driver(seiko_panel_platform_driver);
366 MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
367 MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
368 MODULE_LICENSE("GPL v2");