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 
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 
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, m->vrefresh);
96 			continue;
97 		}
98 
99 		mode->type |= DRM_MODE_TYPE_DRIVER;
100 
101 		if (panel->desc->num_modes == 1)
102 			mode->type |= DRM_MODE_TYPE_PREFERRED;
103 
104 		drm_mode_set_name(mode);
105 
106 		drm_mode_probed_add(connector, mode);
107 		num++;
108 	}
109 
110 	connector->display_info.bpc = panel->desc->bpc;
111 	connector->display_info.width_mm = panel->desc->size.width;
112 	connector->display_info.height_mm = panel->desc->size.height;
113 	if (panel->desc->bus_format)
114 		drm_display_info_set_bus_formats(&connector->display_info,
115 						 &panel->desc->bus_format, 1);
116 	connector->display_info.bus_flags = panel->desc->bus_flags;
117 
118 	return num;
119 }
120 
121 static int seiko_panel_disable(struct drm_panel *panel)
122 {
123 	struct seiko_panel *p = to_seiko_panel(panel);
124 
125 	if (!p->enabled)
126 		return 0;
127 
128 	p->enabled = false;
129 
130 	return 0;
131 }
132 
133 static int seiko_panel_unprepare(struct drm_panel *panel)
134 {
135 	struct seiko_panel *p = to_seiko_panel(panel);
136 
137 	if (!p->prepared)
138 		return 0;
139 
140 	regulator_disable(p->avdd);
141 
142 	/* Add a 100ms delay as per the panel datasheet */
143 	msleep(100);
144 
145 	regulator_disable(p->dvdd);
146 
147 	p->prepared = false;
148 
149 	return 0;
150 }
151 
152 static int seiko_panel_prepare(struct drm_panel *panel)
153 {
154 	struct seiko_panel *p = to_seiko_panel(panel);
155 	int err;
156 
157 	if (p->prepared)
158 		return 0;
159 
160 	err = regulator_enable(p->dvdd);
161 	if (err < 0) {
162 		dev_err(panel->dev, "failed to enable dvdd: %d\n", err);
163 		return err;
164 	}
165 
166 	/* Add a 100ms delay as per the panel datasheet */
167 	msleep(100);
168 
169 	err = regulator_enable(p->avdd);
170 	if (err < 0) {
171 		dev_err(panel->dev, "failed to enable avdd: %d\n", err);
172 		goto disable_dvdd;
173 	}
174 
175 	p->prepared = true;
176 
177 	return 0;
178 
179 disable_dvdd:
180 	regulator_disable(p->dvdd);
181 	return err;
182 }
183 
184 static int seiko_panel_enable(struct drm_panel *panel)
185 {
186 	struct seiko_panel *p = to_seiko_panel(panel);
187 
188 	if (p->enabled)
189 		return 0;
190 
191 	p->enabled = true;
192 
193 	return 0;
194 }
195 
196 static int seiko_panel_get_modes(struct drm_panel *panel,
197 				 struct drm_connector *connector)
198 {
199 	struct seiko_panel *p = to_seiko_panel(panel);
200 
201 	/* add hard-coded panel modes */
202 	return seiko_panel_get_fixed_modes(p, connector);
203 }
204 
205 static int seiko_panel_get_timings(struct drm_panel *panel,
206 				    unsigned int num_timings,
207 				    struct display_timing *timings)
208 {
209 	struct seiko_panel *p = to_seiko_panel(panel);
210 	unsigned int i;
211 
212 	if (p->desc->num_timings < num_timings)
213 		num_timings = p->desc->num_timings;
214 
215 	if (timings)
216 		for (i = 0; i < num_timings; i++)
217 			timings[i] = p->desc->timings[i];
218 
219 	return p->desc->num_timings;
220 }
221 
222 static const struct drm_panel_funcs seiko_panel_funcs = {
223 	.disable = seiko_panel_disable,
224 	.unprepare = seiko_panel_unprepare,
225 	.prepare = seiko_panel_prepare,
226 	.enable = seiko_panel_enable,
227 	.get_modes = seiko_panel_get_modes,
228 	.get_timings = seiko_panel_get_timings,
229 };
230 
231 static int seiko_panel_probe(struct device *dev,
232 					const struct seiko_panel_desc *desc)
233 {
234 	struct seiko_panel *panel;
235 	int err;
236 
237 	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
238 	if (!panel)
239 		return -ENOMEM;
240 
241 	panel->enabled = false;
242 	panel->prepared = false;
243 	panel->desc = desc;
244 
245 	panel->dvdd = devm_regulator_get(dev, "dvdd");
246 	if (IS_ERR(panel->dvdd))
247 		return PTR_ERR(panel->dvdd);
248 
249 	panel->avdd = devm_regulator_get(dev, "avdd");
250 	if (IS_ERR(panel->avdd))
251 		return PTR_ERR(panel->avdd);
252 
253 	drm_panel_init(&panel->base, dev, &seiko_panel_funcs,
254 		       DRM_MODE_CONNECTOR_DPI);
255 
256 	err = drm_panel_of_backlight(&panel->base);
257 	if (err)
258 		return err;
259 
260 	err = drm_panel_add(&panel->base);
261 	if (err < 0)
262 		return err;
263 
264 	dev_set_drvdata(dev, panel);
265 
266 	return 0;
267 }
268 
269 static int seiko_panel_remove(struct platform_device *pdev)
270 {
271 	struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
272 
273 	drm_panel_remove(&panel->base);
274 	drm_panel_disable(&panel->base);
275 
276 	return 0;
277 }
278 
279 static void seiko_panel_shutdown(struct platform_device *pdev)
280 {
281 	struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
282 
283 	drm_panel_disable(&panel->base);
284 }
285 
286 static const struct display_timing seiko_43wvf1g_timing = {
287 	.pixelclock = { 33500000, 33500000, 33500000 },
288 	.hactive = { 800, 800, 800 },
289 	.hfront_porch = {  164, 164, 164 },
290 	.hback_porch = { 89, 89, 89 },
291 	.hsync_len = { 10, 10, 10 },
292 	.vactive = { 480, 480, 480 },
293 	.vfront_porch = { 10, 10, 10 },
294 	.vback_porch = { 23, 23, 23 },
295 	.vsync_len = { 10, 10, 10 },
296 	.flags = DISPLAY_FLAGS_DE_LOW,
297 };
298 
299 static const struct seiko_panel_desc seiko_43wvf1g = {
300 	.timings = &seiko_43wvf1g_timing,
301 	.num_timings = 1,
302 	.bpc = 8,
303 	.size = {
304 		.width = 93,
305 		.height = 57,
306 	},
307 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
308 	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
309 };
310 
311 static const struct of_device_id platform_of_match[] = {
312 	{
313 		.compatible = "sii,43wvf1g",
314 		.data = &seiko_43wvf1g,
315 	}, {
316 		/* sentinel */
317 	}
318 };
319 MODULE_DEVICE_TABLE(of, platform_of_match);
320 
321 static int seiko_panel_platform_probe(struct platform_device *pdev)
322 {
323 	const struct of_device_id *id;
324 
325 	id = of_match_node(platform_of_match, pdev->dev.of_node);
326 	if (!id)
327 		return -ENODEV;
328 
329 	return seiko_panel_probe(&pdev->dev, id->data);
330 }
331 
332 static struct platform_driver seiko_panel_platform_driver = {
333 	.driver = {
334 		.name = "seiko_panel",
335 		.of_match_table = platform_of_match,
336 	},
337 	.probe = seiko_panel_platform_probe,
338 	.remove = seiko_panel_remove,
339 	.shutdown = seiko_panel_shutdown,
340 };
341 module_platform_driver(seiko_panel_platform_driver);
342 
343 MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
344 MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
345 MODULE_LICENSE("GPL v2");
346