1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2015 Red Hat
4  * Copyright (C) 2015 Sony Mobile Communications Inc.
5  * Author: Werner Johansson <werner.johansson@sonymobile.com>
6  *
7  * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
8  */
9 
10 #include <linux/delay.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/regulator/consumer.h>
14 
15 #include <video/mipi_display.h>
16 
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_device.h>
19 #include <drm/drm_mipi_dsi.h>
20 #include <drm/drm_panel.h>
21 
22 /*
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
26  */
27 #define MIN_POFF_MS (500)
28 
29 struct wuxga_nt_panel {
30 	struct drm_panel base;
31 	struct mipi_dsi_device *dsi;
32 
33 	struct regulator *supply;
34 
35 	bool prepared;
36 	bool enabled;
37 
38 	ktime_t earliest_wake;
39 
40 	const struct drm_display_mode *mode;
41 };
42 
to_wuxga_nt_panel(struct drm_panel * panel)43 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
44 {
45 	return container_of(panel, struct wuxga_nt_panel, base);
46 }
47 
wuxga_nt_panel_on(struct wuxga_nt_panel * wuxga_nt)48 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
49 {
50 	return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
51 }
52 
wuxga_nt_panel_disable(struct drm_panel * panel)53 static int wuxga_nt_panel_disable(struct drm_panel *panel)
54 {
55 	struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
56 	int mipi_ret, bl_ret = 0;
57 
58 	if (!wuxga_nt->enabled)
59 		return 0;
60 
61 	mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
62 
63 	wuxga_nt->enabled = false;
64 
65 	return mipi_ret ? mipi_ret : bl_ret;
66 }
67 
wuxga_nt_panel_unprepare(struct drm_panel * panel)68 static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
69 {
70 	struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
71 
72 	if (!wuxga_nt->prepared)
73 		return 0;
74 
75 	regulator_disable(wuxga_nt->supply);
76 	wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
77 	wuxga_nt->prepared = false;
78 
79 	return 0;
80 }
81 
wuxga_nt_panel_prepare(struct drm_panel * panel)82 static int wuxga_nt_panel_prepare(struct drm_panel *panel)
83 {
84 	struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
85 	int ret;
86 	s64 enablewait;
87 
88 	if (wuxga_nt->prepared)
89 		return 0;
90 
91 	/*
92 	 * If the user re-enabled the panel before the required off-time then
93 	 * we need to wait the remaining period before re-enabling regulator
94 	 */
95 	enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
96 
97 	/* Sanity check, this should never happen */
98 	if (enablewait > MIN_POFF_MS)
99 		enablewait = MIN_POFF_MS;
100 
101 	if (enablewait > 0)
102 		msleep(enablewait);
103 
104 	ret = regulator_enable(wuxga_nt->supply);
105 	if (ret < 0)
106 		return ret;
107 
108 	/*
109 	 * A minimum delay of 250ms is required after power-up until commands
110 	 * can be sent
111 	 */
112 	msleep(250);
113 
114 	ret = wuxga_nt_panel_on(wuxga_nt);
115 	if (ret < 0) {
116 		dev_err(panel->dev, "failed to set panel on: %d\n", ret);
117 		goto poweroff;
118 	}
119 
120 	wuxga_nt->prepared = true;
121 
122 	return 0;
123 
124 poweroff:
125 	regulator_disable(wuxga_nt->supply);
126 
127 	return ret;
128 }
129 
wuxga_nt_panel_enable(struct drm_panel * panel)130 static int wuxga_nt_panel_enable(struct drm_panel *panel)
131 {
132 	struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
133 
134 	if (wuxga_nt->enabled)
135 		return 0;
136 
137 	wuxga_nt->enabled = true;
138 
139 	return 0;
140 }
141 
142 static const struct drm_display_mode default_mode = {
143 	.clock = 164402,
144 	.hdisplay = 1920,
145 	.hsync_start = 1920 + 152,
146 	.hsync_end = 1920 + 152 + 52,
147 	.htotal = 1920 + 152 + 52 + 20,
148 	.vdisplay = 1200,
149 	.vsync_start = 1200 + 24,
150 	.vsync_end = 1200 + 24 + 6,
151 	.vtotal = 1200 + 24 + 6 + 48,
152 };
153 
wuxga_nt_panel_get_modes(struct drm_panel * panel,struct drm_connector * connector)154 static int wuxga_nt_panel_get_modes(struct drm_panel *panel,
155 				    struct drm_connector *connector)
156 {
157 	struct drm_display_mode *mode;
158 
159 	mode = drm_mode_duplicate(connector->dev, &default_mode);
160 	if (!mode) {
161 		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
162 			default_mode.hdisplay, default_mode.vdisplay,
163 			drm_mode_vrefresh(&default_mode));
164 		return -ENOMEM;
165 	}
166 
167 	drm_mode_set_name(mode);
168 
169 	drm_mode_probed_add(connector, mode);
170 
171 	connector->display_info.width_mm = 217;
172 	connector->display_info.height_mm = 136;
173 
174 	return 1;
175 }
176 
177 static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
178 	.disable = wuxga_nt_panel_disable,
179 	.unprepare = wuxga_nt_panel_unprepare,
180 	.prepare = wuxga_nt_panel_prepare,
181 	.enable = wuxga_nt_panel_enable,
182 	.get_modes = wuxga_nt_panel_get_modes,
183 };
184 
185 static const struct of_device_id wuxga_nt_of_match[] = {
186 	{ .compatible = "panasonic,vvx10f034n00", },
187 	{ }
188 };
189 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
190 
wuxga_nt_panel_add(struct wuxga_nt_panel * wuxga_nt)191 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
192 {
193 	struct device *dev = &wuxga_nt->dsi->dev;
194 	int ret;
195 
196 	wuxga_nt->mode = &default_mode;
197 
198 	wuxga_nt->supply = devm_regulator_get(dev, "power");
199 	if (IS_ERR(wuxga_nt->supply))
200 		return PTR_ERR(wuxga_nt->supply);
201 
202 	drm_panel_init(&wuxga_nt->base, &wuxga_nt->dsi->dev,
203 		       &wuxga_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
204 
205 	ret = drm_panel_of_backlight(&wuxga_nt->base);
206 	if (ret)
207 		return ret;
208 
209 	drm_panel_add(&wuxga_nt->base);
210 
211 	return 0;
212 }
213 
wuxga_nt_panel_del(struct wuxga_nt_panel * wuxga_nt)214 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
215 {
216 	if (wuxga_nt->base.dev)
217 		drm_panel_remove(&wuxga_nt->base);
218 }
219 
wuxga_nt_panel_probe(struct mipi_dsi_device * dsi)220 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
221 {
222 	struct wuxga_nt_panel *wuxga_nt;
223 	int ret;
224 
225 	dsi->lanes = 4;
226 	dsi->format = MIPI_DSI_FMT_RGB888;
227 	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
228 			MIPI_DSI_MODE_VIDEO_HSE |
229 			MIPI_DSI_CLOCK_NON_CONTINUOUS |
230 			MIPI_DSI_MODE_LPM;
231 
232 	wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
233 	if (!wuxga_nt)
234 		return -ENOMEM;
235 
236 	mipi_dsi_set_drvdata(dsi, wuxga_nt);
237 
238 	wuxga_nt->dsi = dsi;
239 
240 	ret = wuxga_nt_panel_add(wuxga_nt);
241 	if (ret < 0)
242 		return ret;
243 
244 	ret = mipi_dsi_attach(dsi);
245 	if (ret < 0) {
246 		wuxga_nt_panel_del(wuxga_nt);
247 		return ret;
248 	}
249 
250 	return 0;
251 }
252 
wuxga_nt_panel_remove(struct mipi_dsi_device * dsi)253 static void wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
254 {
255 	struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
256 	int ret;
257 
258 	ret = drm_panel_disable(&wuxga_nt->base);
259 	if (ret < 0)
260 		dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
261 
262 	ret = mipi_dsi_detach(dsi);
263 	if (ret < 0)
264 		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
265 
266 	wuxga_nt_panel_del(wuxga_nt);
267 }
268 
wuxga_nt_panel_shutdown(struct mipi_dsi_device * dsi)269 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
270 {
271 	struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
272 
273 	drm_panel_disable(&wuxga_nt->base);
274 }
275 
276 static struct mipi_dsi_driver wuxga_nt_panel_driver = {
277 	.driver = {
278 		.name = "panel-panasonic-vvx10f034n00",
279 		.of_match_table = wuxga_nt_of_match,
280 	},
281 	.probe = wuxga_nt_panel_probe,
282 	.remove = wuxga_nt_panel_remove,
283 	.shutdown = wuxga_nt_panel_shutdown,
284 };
285 module_mipi_dsi_driver(wuxga_nt_panel_driver);
286 
287 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
288 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
289 MODULE_LICENSE("GPL v2");
290