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	ktime_t earliest_wake;
 36
 37	const struct drm_display_mode *mode;
 38};
 39
 40static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
 41{
 42	return container_of(panel, struct wuxga_nt_panel, base);
 43}
 44
 45static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
 46{
 47	return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
 48}
 49
 50static int wuxga_nt_panel_disable(struct drm_panel *panel)
 51{
 52	struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 53
 54	return mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
 55}
 56
 57static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
 58{
 59	struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 60
 61	regulator_disable(wuxga_nt->supply);
 62	wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
 63
 64	return 0;
 65}
 66
 67static int wuxga_nt_panel_prepare(struct drm_panel *panel)
 68{
 69	struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 70	int ret;
 71	s64 enablewait;
 72
 73	/*
 74	 * If the user re-enabled the panel before the required off-time then
 75	 * we need to wait the remaining period before re-enabling regulator
 76	 */
 77	enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
 78
 79	/* Sanity check, this should never happen */
 80	if (enablewait > MIN_POFF_MS)
 81		enablewait = MIN_POFF_MS;
 82
 83	if (enablewait > 0)
 84		msleep(enablewait);
 85
 86	ret = regulator_enable(wuxga_nt->supply);
 87	if (ret < 0)
 88		return ret;
 89
 90	/*
 91	 * A minimum delay of 250ms is required after power-up until commands
 92	 * can be sent
 93	 */
 94	msleep(250);
 95
 96	ret = wuxga_nt_panel_on(wuxga_nt);
 97	if (ret < 0) {
 98		dev_err(panel->dev, "failed to set panel on: %d\n", ret);
 99		goto poweroff;
100	}
101
102	return 0;
103
104poweroff:
105	regulator_disable(wuxga_nt->supply);
106
107	return ret;
108}
109
110static const struct drm_display_mode default_mode = {
111	.clock = 164402,
112	.hdisplay = 1920,
113	.hsync_start = 1920 + 152,
114	.hsync_end = 1920 + 152 + 52,
115	.htotal = 1920 + 152 + 52 + 20,
116	.vdisplay = 1200,
117	.vsync_start = 1200 + 24,
118	.vsync_end = 1200 + 24 + 6,
119	.vtotal = 1200 + 24 + 6 + 48,
120};
121
122static int wuxga_nt_panel_get_modes(struct drm_panel *panel,
123				    struct drm_connector *connector)
124{
125	struct drm_display_mode *mode;
126
127	mode = drm_mode_duplicate(connector->dev, &default_mode);
128	if (!mode) {
129		dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
130			default_mode.hdisplay, default_mode.vdisplay,
131			drm_mode_vrefresh(&default_mode));
132		return -ENOMEM;
133	}
134
135	drm_mode_set_name(mode);
136
137	drm_mode_probed_add(connector, mode);
138
139	connector->display_info.width_mm = 217;
140	connector->display_info.height_mm = 136;
141
142	return 1;
143}
144
145static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
146	.disable = wuxga_nt_panel_disable,
147	.unprepare = wuxga_nt_panel_unprepare,
148	.prepare = wuxga_nt_panel_prepare,
149	.get_modes = wuxga_nt_panel_get_modes,
150};
151
152static const struct of_device_id wuxga_nt_of_match[] = {
153	{ .compatible = "panasonic,vvx10f034n00", },
154	{ }
155};
156MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
157
158static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
159{
160	struct device *dev = &wuxga_nt->dsi->dev;
161	int ret;
162
163	wuxga_nt->mode = &default_mode;
164
165	wuxga_nt->supply = devm_regulator_get(dev, "power");
166	if (IS_ERR(wuxga_nt->supply))
167		return PTR_ERR(wuxga_nt->supply);
168
169	drm_panel_init(&wuxga_nt->base, &wuxga_nt->dsi->dev,
170		       &wuxga_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
171
172	ret = drm_panel_of_backlight(&wuxga_nt->base);
173	if (ret)
174		return ret;
175
176	drm_panel_add(&wuxga_nt->base);
177
178	return 0;
179}
180
181static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
182{
183	if (wuxga_nt->base.dev)
184		drm_panel_remove(&wuxga_nt->base);
185}
186
187static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
188{
189	struct wuxga_nt_panel *wuxga_nt;
190	int ret;
191
192	dsi->lanes = 4;
193	dsi->format = MIPI_DSI_FMT_RGB888;
194	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
195			MIPI_DSI_MODE_VIDEO_HSE |
196			MIPI_DSI_CLOCK_NON_CONTINUOUS |
197			MIPI_DSI_MODE_LPM;
198
199	wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
200	if (!wuxga_nt)
201		return -ENOMEM;
202
203	mipi_dsi_set_drvdata(dsi, wuxga_nt);
204
205	wuxga_nt->dsi = dsi;
206
207	ret = wuxga_nt_panel_add(wuxga_nt);
208	if (ret < 0)
209		return ret;
210
211	ret = mipi_dsi_attach(dsi);
212	if (ret < 0) {
213		wuxga_nt_panel_del(wuxga_nt);
214		return ret;
215	}
216
217	return 0;
218}
219
220static void wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
221{
222	struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
223	int ret;
224
225	ret = mipi_dsi_detach(dsi);
226	if (ret < 0)
227		dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
228
229	wuxga_nt_panel_del(wuxga_nt);
230}
231
232static struct mipi_dsi_driver wuxga_nt_panel_driver = {
233	.driver = {
234		.name = "panel-panasonic-vvx10f034n00",
235		.of_match_table = wuxga_nt_of_match,
236	},
237	.probe = wuxga_nt_panel_probe,
238	.remove = wuxga_nt_panel_remove,
239};
240module_mipi_dsi_driver(wuxga_nt_panel_driver);
241
242MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
243MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
244MODULE_LICENSE("GPL v2");