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
 29struct 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
 43static 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
 48static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
 49{
 50	return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
 51}
 52
 53static 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
 68static 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
 82static 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
124poweroff:
125	regulator_disable(wuxga_nt->supply);
126
127	return ret;
128}
129
130static 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
142static 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
154static 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
177static 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
185static const struct of_device_id wuxga_nt_of_match[] = {
186	{ .compatible = "panasonic,vvx10f034n00", },
187	{ }
188};
189MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
190
191static 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
214static 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
220static 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
253static 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
269static 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
276static 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};
285module_mipi_dsi_driver(wuxga_nt_panel_driver);
286
287MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
288MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
289MODULE_LICENSE("GPL v2");