1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2017 NXP Semiconductors.
4 * Author: Marco Franchi <marco.franchi@nxp.com>
5 *
6 * Based on Panel Simple driver by Thierry Reding <treding@nvidia.com>
7 */
8
9 #include <linux/delay.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/platform_device.h>
13 #include <linux/regulator/consumer.h>
14
15 #include <video/display_timing.h>
16 #include <video/videomode.h>
17
18 #include <drm/drm_crtc.h>
19 #include <drm/drm_device.h>
20 #include <drm/drm_panel.h>
21
22 struct seiko_panel_desc {
23 const struct drm_display_mode *modes;
24 unsigned int num_modes;
25 const struct display_timing *timings;
26 unsigned int num_timings;
27
28 unsigned int bpc;
29
30 /**
31 * @width: width (in millimeters) of the panel's active display area
32 * @height: height (in millimeters) of the panel's active display area
33 */
34 struct {
35 unsigned int width;
36 unsigned int height;
37 } size;
38
39 u32 bus_format;
40 u32 bus_flags;
41 };
42
43 struct seiko_panel {
44 struct drm_panel base;
45 bool prepared;
46 bool enabled;
47 const struct seiko_panel_desc *desc;
48 struct regulator *dvdd;
49 struct regulator *avdd;
50 };
51
to_seiko_panel(struct drm_panel * panel)52 static inline struct seiko_panel *to_seiko_panel(struct drm_panel *panel)
53 {
54 return container_of(panel, struct seiko_panel, base);
55 }
56
seiko_panel_get_fixed_modes(struct seiko_panel * panel,struct drm_connector * connector)57 static int seiko_panel_get_fixed_modes(struct seiko_panel *panel,
58 struct drm_connector *connector)
59 {
60 struct drm_display_mode *mode;
61 unsigned int i, num = 0;
62
63 if (!panel->desc)
64 return 0;
65
66 for (i = 0; i < panel->desc->num_timings; i++) {
67 const struct display_timing *dt = &panel->desc->timings[i];
68 struct videomode vm;
69
70 videomode_from_timing(dt, &vm);
71 mode = drm_mode_create(connector->dev);
72 if (!mode) {
73 dev_err(panel->base.dev, "failed to add mode %ux%u\n",
74 dt->hactive.typ, dt->vactive.typ);
75 continue;
76 }
77
78 drm_display_mode_from_videomode(&vm, mode);
79
80 mode->type |= DRM_MODE_TYPE_DRIVER;
81
82 if (panel->desc->num_timings == 1)
83 mode->type |= DRM_MODE_TYPE_PREFERRED;
84
85 drm_mode_probed_add(connector, mode);
86 num++;
87 }
88
89 for (i = 0; i < panel->desc->num_modes; i++) {
90 const struct drm_display_mode *m = &panel->desc->modes[i];
91
92 mode = drm_mode_duplicate(connector->dev, m);
93 if (!mode) {
94 dev_err(panel->base.dev, "failed to add mode %ux%u@%u\n",
95 m->hdisplay, m->vdisplay,
96 drm_mode_vrefresh(m));
97 continue;
98 }
99
100 mode->type |= DRM_MODE_TYPE_DRIVER;
101
102 if (panel->desc->num_modes == 1)
103 mode->type |= DRM_MODE_TYPE_PREFERRED;
104
105 drm_mode_set_name(mode);
106
107 drm_mode_probed_add(connector, mode);
108 num++;
109 }
110
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;
118
119 return num;
120 }
121
seiko_panel_disable(struct drm_panel * panel)122 static int seiko_panel_disable(struct drm_panel *panel)
123 {
124 struct seiko_panel *p = to_seiko_panel(panel);
125
126 if (!p->enabled)
127 return 0;
128
129 p->enabled = false;
130
131 return 0;
132 }
133
seiko_panel_unprepare(struct drm_panel * panel)134 static int seiko_panel_unprepare(struct drm_panel *panel)
135 {
136 struct seiko_panel *p = to_seiko_panel(panel);
137
138 if (!p->prepared)
139 return 0;
140
141 regulator_disable(p->avdd);
142
143 /* Add a 100ms delay as per the panel datasheet */
144 msleep(100);
145
146 regulator_disable(p->dvdd);
147
148 p->prepared = false;
149
150 return 0;
151 }
152
seiko_panel_prepare(struct drm_panel * panel)153 static int seiko_panel_prepare(struct drm_panel *panel)
154 {
155 struct seiko_panel *p = to_seiko_panel(panel);
156 int err;
157
158 if (p->prepared)
159 return 0;
160
161 err = regulator_enable(p->dvdd);
162 if (err < 0) {
163 dev_err(panel->dev, "failed to enable dvdd: %d\n", err);
164 return err;
165 }
166
167 /* Add a 100ms delay as per the panel datasheet */
168 msleep(100);
169
170 err = regulator_enable(p->avdd);
171 if (err < 0) {
172 dev_err(panel->dev, "failed to enable avdd: %d\n", err);
173 goto disable_dvdd;
174 }
175
176 p->prepared = true;
177
178 return 0;
179
180 disable_dvdd:
181 regulator_disable(p->dvdd);
182 return err;
183 }
184
seiko_panel_enable(struct drm_panel * panel)185 static int seiko_panel_enable(struct drm_panel *panel)
186 {
187 struct seiko_panel *p = to_seiko_panel(panel);
188
189 if (p->enabled)
190 return 0;
191
192 p->enabled = true;
193
194 return 0;
195 }
196
seiko_panel_get_modes(struct drm_panel * panel,struct drm_connector * connector)197 static int seiko_panel_get_modes(struct drm_panel *panel,
198 struct drm_connector *connector)
199 {
200 struct seiko_panel *p = to_seiko_panel(panel);
201
202 /* add hard-coded panel modes */
203 return seiko_panel_get_fixed_modes(p, connector);
204 }
205
seiko_panel_get_timings(struct drm_panel * panel,unsigned int num_timings,struct display_timing * timings)206 static int seiko_panel_get_timings(struct drm_panel *panel,
207 unsigned int num_timings,
208 struct display_timing *timings)
209 {
210 struct seiko_panel *p = to_seiko_panel(panel);
211 unsigned int i;
212
213 if (p->desc->num_timings < num_timings)
214 num_timings = p->desc->num_timings;
215
216 if (timings)
217 for (i = 0; i < num_timings; i++)
218 timings[i] = p->desc->timings[i];
219
220 return p->desc->num_timings;
221 }
222
223 static const struct drm_panel_funcs seiko_panel_funcs = {
224 .disable = seiko_panel_disable,
225 .unprepare = seiko_panel_unprepare,
226 .prepare = seiko_panel_prepare,
227 .enable = seiko_panel_enable,
228 .get_modes = seiko_panel_get_modes,
229 .get_timings = seiko_panel_get_timings,
230 };
231
seiko_panel_probe(struct device * dev,const struct seiko_panel_desc * desc)232 static int seiko_panel_probe(struct device *dev,
233 const struct seiko_panel_desc *desc)
234 {
235 struct seiko_panel *panel;
236 int err;
237
238 panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
239 if (!panel)
240 return -ENOMEM;
241
242 panel->enabled = false;
243 panel->prepared = false;
244 panel->desc = desc;
245
246 panel->dvdd = devm_regulator_get(dev, "dvdd");
247 if (IS_ERR(panel->dvdd))
248 return PTR_ERR(panel->dvdd);
249
250 panel->avdd = devm_regulator_get(dev, "avdd");
251 if (IS_ERR(panel->avdd))
252 return PTR_ERR(panel->avdd);
253
254 drm_panel_init(&panel->base, dev, &seiko_panel_funcs,
255 DRM_MODE_CONNECTOR_DPI);
256
257 err = drm_panel_of_backlight(&panel->base);
258 if (err)
259 return err;
260
261 drm_panel_add(&panel->base);
262
263 dev_set_drvdata(dev, panel);
264
265 return 0;
266 }
267
seiko_panel_remove(struct platform_device * pdev)268 static int seiko_panel_remove(struct platform_device *pdev)
269 {
270 struct seiko_panel *panel = platform_get_drvdata(pdev);
271
272 drm_panel_remove(&panel->base);
273 drm_panel_disable(&panel->base);
274
275 return 0;
276 }
277
seiko_panel_shutdown(struct platform_device * pdev)278 static void seiko_panel_shutdown(struct platform_device *pdev)
279 {
280 struct seiko_panel *panel = platform_get_drvdata(pdev);
281
282 drm_panel_disable(&panel->base);
283 }
284
285 static const struct display_timing seiko_43wvf1g_timing = {
286 .pixelclock = { 33500000, 33500000, 33500000 },
287 .hactive = { 800, 800, 800 },
288 .hfront_porch = { 164, 164, 164 },
289 .hback_porch = { 89, 89, 89 },
290 .hsync_len = { 10, 10, 10 },
291 .vactive = { 480, 480, 480 },
292 .vfront_porch = { 10, 10, 10 },
293 .vback_porch = { 23, 23, 23 },
294 .vsync_len = { 10, 10, 10 },
295 .flags = DISPLAY_FLAGS_DE_LOW,
296 };
297
298 static const struct seiko_panel_desc seiko_43wvf1g = {
299 .timings = &seiko_43wvf1g_timing,
300 .num_timings = 1,
301 .bpc = 8,
302 .size = {
303 .width = 93,
304 .height = 57,
305 },
306 .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
307 .bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
308 };
309
310 static const struct of_device_id platform_of_match[] = {
311 {
312 .compatible = "sii,43wvf1g",
313 .data = &seiko_43wvf1g,
314 }, {
315 /* sentinel */
316 }
317 };
318 MODULE_DEVICE_TABLE(of, platform_of_match);
319
seiko_panel_platform_probe(struct platform_device * pdev)320 static int seiko_panel_platform_probe(struct platform_device *pdev)
321 {
322 const struct of_device_id *id;
323
324 id = of_match_node(platform_of_match, pdev->dev.of_node);
325 if (!id)
326 return -ENODEV;
327
328 return seiko_panel_probe(&pdev->dev, id->data);
329 }
330
331 static struct platform_driver seiko_panel_platform_driver = {
332 .driver = {
333 .name = "seiko_panel",
334 .of_match_table = platform_of_match,
335 },
336 .probe = seiko_panel_platform_probe,
337 .remove = seiko_panel_remove,
338 .shutdown = seiko_panel_shutdown,
339 };
340 module_platform_driver(seiko_panel_platform_driver);
341
342 MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
343 MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
344 MODULE_LICENSE("GPL v2");
345