--- /dev/null
+/*
+ * Copyright (C) 2015 Red Hat
+ * Copyright (C) 2015 Sony Mobile Communications Inc.
+ * Author: Werner Johansson <werner.johansson@sonymobile.com>
+ *
+ * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+/*
+ * When power is turned off to this panel a minimum off time of 500ms has to be
+ * observed before powering back on as there's no external reset pin. Keep
+ * track of earliest wakeup time and delay subsequent prepare call accordingly
+ */
+#define MIN_POFF_MS (500)
+
+struct wuxga_nt_panel {
+ struct drm_panel base;
+ struct mipi_dsi_device *dsi;
+
+ struct backlight_device *backlight;
+ struct regulator *supply;
+
+ bool prepared;
+ bool enabled;
+
+ ktime_t earliest_wake;
+
+ const struct drm_display_mode *mode;
+};
+
+static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
+{
+ return container_of(panel, struct wuxga_nt_panel, base);
+}
+
+static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
+{
+ struct mipi_dsi_device *dsi = wuxga_nt->dsi;
+ int ret;
+
+ ret = mipi_dsi_turn_on_peripheral(dsi);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int wuxga_nt_panel_disable(struct drm_panel *panel)
+{
+ struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+
+ if (!wuxga_nt->enabled)
+ return 0;
+
+ mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
+
+ if (wuxga_nt->backlight) {
+ wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN;
+ wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK;
+ backlight_update_status(wuxga_nt->backlight);
+ }
+
+ wuxga_nt->enabled = false;
+
+ return 0;
+}
+
+static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
+{
+ struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+
+ if (!wuxga_nt->prepared)
+ return 0;
+
+ regulator_disable(wuxga_nt->supply);
+ wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
+ wuxga_nt->prepared = false;
+
+ return 0;
+}
+
+static int wuxga_nt_panel_prepare(struct drm_panel *panel)
+{
+ struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+ int ret;
+ s64 enablewait;
+
+ if (wuxga_nt->prepared)
+ return 0;
+
+ /*
+ * If the user re-enabled the panel before the required off-time then
+ * we need to wait the remaining period before re-enabling regulator
+ */
+ enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
+
+ /* Sanity check, this should never happen */
+ if (enablewait > MIN_POFF_MS)
+ enablewait = MIN_POFF_MS;
+
+ if (enablewait > 0)
+ msleep(enablewait);
+
+ ret = regulator_enable(wuxga_nt->supply);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * A minimum delay of 250ms is required after power-up until commands
+ * can be sent
+ */
+ msleep(250);
+
+ ret = wuxga_nt_panel_on(wuxga_nt);
+ if (ret < 0) {
+ dev_err(panel->dev, "failed to set panel on: %d\n", ret);
+ goto poweroff;
+ }
+
+ wuxga_nt->prepared = true;
+
+ return 0;
+
+poweroff:
+ regulator_disable(wuxga_nt->supply);
+
+ return ret;
+}
+
+static int wuxga_nt_panel_enable(struct drm_panel *panel)
+{
+ struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
+
+ if (wuxga_nt->enabled)
+ return 0;
+
+ if (wuxga_nt->backlight) {
+ wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK;
+ wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK;
+ backlight_update_status(wuxga_nt->backlight);
+ }
+
+ wuxga_nt->enabled = true;
+
+ return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+ .clock = 164402,
+ .hdisplay = 1920,
+ .hsync_start = 1920 + 152,
+ .hsync_end = 1920 + 152 + 52,
+ .htotal = 1920 + 152 + 52 + 20,
+ .vdisplay = 1200,
+ .vsync_start = 1200 + 24,
+ .vsync_end = 1200 + 24 + 6,
+ .vtotal = 1200 + 24 + 6 + 48,
+ .vrefresh = 60,
+};
+
+static int wuxga_nt_panel_get_modes(struct drm_panel *panel)
+{
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(panel->drm, &default_mode);
+ if (!mode) {
+ dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
+ default_mode.hdisplay, default_mode.vdisplay,
+ default_mode.vrefresh);
+ return -ENOMEM;
+ }
+
+ drm_mode_set_name(mode);
+
+ drm_mode_probed_add(panel->connector, mode);
+
+ panel->connector->display_info.width_mm = 217;
+ panel->connector->display_info.height_mm = 136;
+
+ return 1;
+}
+
+static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
+ .disable = wuxga_nt_panel_disable,
+ .unprepare = wuxga_nt_panel_unprepare,
+ .prepare = wuxga_nt_panel_prepare,
+ .enable = wuxga_nt_panel_enable,
+ .get_modes = wuxga_nt_panel_get_modes,
+};
+
+static const struct of_device_id wuxga_nt_of_match[] = {
+ { .compatible = "panasonic,vvx10f034n00", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
+
+static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
+{
+ struct device *dev = &wuxga_nt->dsi->dev;
+ struct device_node *np;
+ int ret;
+
+ wuxga_nt->mode = &default_mode;
+
+ wuxga_nt->supply = devm_regulator_get(dev, "power");
+ if (IS_ERR(wuxga_nt->supply))
+ return PTR_ERR(wuxga_nt->supply);
+
+ np = of_parse_phandle(dev->of_node, "backlight", 0);
+ if (np) {
+ wuxga_nt->backlight = of_find_backlight_by_node(np);
+ of_node_put(np);
+
+ if (!wuxga_nt->backlight)
+ return -EPROBE_DEFER;
+ }
+
+ drm_panel_init(&wuxga_nt->base);
+ wuxga_nt->base.funcs = &wuxga_nt_panel_funcs;
+ wuxga_nt->base.dev = &wuxga_nt->dsi->dev;
+
+ ret = drm_panel_add(&wuxga_nt->base);
+ if (ret < 0)
+ goto put_backlight;
+
+ return 0;
+
+put_backlight:
+ if (wuxga_nt->backlight)
+ put_device(&wuxga_nt->backlight->dev);
+
+ return ret;
+}
+
+static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
+{
+ if (wuxga_nt->base.dev)
+ drm_panel_remove(&wuxga_nt->base);
+
+ if (wuxga_nt->backlight)
+ put_device(&wuxga_nt->backlight->dev);
+}
+
+static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
+{
+ struct wuxga_nt_panel *wuxga_nt;
+ int ret;
+
+ dsi->lanes = 4;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+ MIPI_DSI_MODE_VIDEO_HSE |
+ MIPI_DSI_CLOCK_NON_CONTINUOUS |
+ MIPI_DSI_MODE_LPM;
+
+ wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
+ if (!wuxga_nt)
+ return -ENOMEM;
+
+ mipi_dsi_set_drvdata(dsi, wuxga_nt);
+
+ wuxga_nt->dsi = dsi;
+
+ ret = wuxga_nt_panel_add(wuxga_nt);
+ if (ret < 0)
+ return ret;
+
+ return mipi_dsi_attach(dsi);
+}
+
+static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
+{
+ struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
+ int ret;
+
+ ret = wuxga_nt_panel_disable(&wuxga_nt->base);
+ if (ret < 0)
+ dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
+
+ ret = mipi_dsi_detach(dsi);
+ if (ret < 0)
+ dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
+
+ drm_panel_detach(&wuxga_nt->base);
+ wuxga_nt_panel_del(wuxga_nt);
+
+ return 0;
+}
+
+static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+ struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
+
+ wuxga_nt_panel_disable(&wuxga_nt->base);
+}
+
+static struct mipi_dsi_driver wuxga_nt_panel_driver = {
+ .driver = {
+ .name = "panel-panasonic-vvx10f034n00",
+ .of_match_table = wuxga_nt_of_match,
+ },
+ .probe = wuxga_nt_panel_probe,
+ .remove = wuxga_nt_panel_remove,
+ .shutdown = wuxga_nt_panel_shutdown,
+};
+module_mipi_dsi_driver(wuxga_nt_panel_driver);
+
+MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
+MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-starfive.git / commitdiff