drm/panel: Add Sharp LS043T1LE01 MIPI DSI panel

The Sharp LS043T1LE01 is a 4.3", 540x960 TFT-LCD panel connected using
two DSI lanes. It is for example found on the Qualcomm Snapdragon 800
Dragonboard (APQ8074).

Signed-off-by: Werner Johansson <[e-mail]>
Signed-off-by: Bjorn Andersson <[e-mail]>
Reviewed-by: Archit Taneja <[e-mail]>
Signed-off-by: Thierry Reding <[e-mail]>

drivers/gpu/drm/panel/Kconfig

···
 	  To compile this driver as a module, choose M here: the module
 	  will be called panel-sharp-lq101r1sx01.
 
+config DRM_PANEL_SHARP_LS043T1LE01
+	tristate "Sharp LS043T1LE01 qHD video mode panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for Sharp LS043T1LE01 qHD
+	  (540x960) DSI panel as found on the Qualcomm APQ8074 Dragonboard
+
 endmenu

drivers/gpu/drm/panel/Makefile

···
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
+obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o

drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c

···
+/*
+ * Copyright (C) 2015 Red Hat
+ * Copyright (C) 2015 Sony Mobile Communications Inc.
+ * Author: Werner Johansson <[e-mail]>
+ *
+ * Based on AUO panel driver by Rob Clark <[e-mail]>
+ *
+ * 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/gpio/consumer.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>
+
+struct sharp_nt_panel {
+	struct drm_panel base;
+	struct mipi_dsi_device *dsi;
+
+	struct backlight_device *backlight;
+	struct regulator *supply;
+	struct gpio_desc *reset_gpio;
+
+	bool prepared;
+	bool enabled;
+
+	const struct drm_display_mode *mode;
+};
+
+static inline struct sharp_nt_panel *to_sharp_nt_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct sharp_nt_panel, base);
+}
+
+static int sharp_nt_panel_init(struct sharp_nt_panel *sharp_nt)
+{
+	struct mipi_dsi_device *dsi = sharp_nt->dsi;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0)
+		return ret;
+
+	msleep(120);
+
+	/* Novatek two-lane operation */
+	ret = mipi_dsi_dcs_write(dsi, 0xae, (u8[]){ 0x03 }, 1);
+	if (ret < 0)
+		return ret;
+
+	/* Set both MCU and RGB I/F to 24bpp */
+	ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT |
+					(MIPI_DCS_PIXEL_FMT_24BIT << 4));
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int sharp_nt_panel_on(struct sharp_nt_panel *sharp_nt)
+{
+	struct mipi_dsi_device *dsi = sharp_nt->dsi;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int sharp_nt_panel_off(struct sharp_nt_panel *sharp_nt)
+{
+	struct mipi_dsi_device *dsi = sharp_nt->dsi;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+
+static int sharp_nt_panel_disable(struct drm_panel *panel)
+{
+	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+
+	if (!sharp_nt->enabled)
+		return 0;
+
+	if (sharp_nt->backlight) {
+		sharp_nt->backlight->props.power = FB_BLANK_POWERDOWN;
+		backlight_update_status(sharp_nt->backlight);
+	}
+
+	sharp_nt->enabled = false;
+
+	return 0;
+}
+
+static int sharp_nt_panel_unprepare(struct drm_panel *panel)
+{
+	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+	int ret;
+
+	if (!sharp_nt->prepared)
+		return 0;
+
+	ret = sharp_nt_panel_off(sharp_nt);
+	if (ret < 0) {
+		dev_err(panel->dev, "failed to set panel off: %d\n", ret);
+		return ret;
+	}
+
+	regulator_disable(sharp_nt->supply);
+	if (sharp_nt->reset_gpio)
+		gpiod_set_value(sharp_nt->reset_gpio, 0);
+
+	sharp_nt->prepared = false;
+
+	return 0;
+}
+
+static int sharp_nt_panel_prepare(struct drm_panel *panel)
+{
+	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+	int ret;
+
+	if (sharp_nt->prepared)
+		return 0;
+
+	ret = regulator_enable(sharp_nt->supply);
+	if (ret < 0)
+		return ret;
+
+	msleep(20);
+
+	if (sharp_nt->reset_gpio) {
+		gpiod_set_value(sharp_nt->reset_gpio, 1);
+		msleep(1);
+		gpiod_set_value(sharp_nt->reset_gpio, 0);
+		msleep(1);
+		gpiod_set_value(sharp_nt->reset_gpio, 1);
+		msleep(10);
+	}
+
+	ret = sharp_nt_panel_init(sharp_nt);
+	if (ret < 0) {
+		dev_err(panel->dev, "failed to init panel: %d\n", ret);
+		goto poweroff;
+	}
+
+	ret = sharp_nt_panel_on(sharp_nt);
+	if (ret < 0) {
+		dev_err(panel->dev, "failed to set panel on: %d\n", ret);
+		goto poweroff;
+	}
+
+	sharp_nt->prepared = true;
+
+	return 0;
+
+poweroff:
+	regulator_disable(sharp_nt->supply);
+	if (sharp_nt->reset_gpio)
+		gpiod_set_value(sharp_nt->reset_gpio, 0);
+	return ret;
+}
+
+static int sharp_nt_panel_enable(struct drm_panel *panel)
+{
+	struct sharp_nt_panel *sharp_nt = to_sharp_nt_panel(panel);
+
+	if (sharp_nt->enabled)
+		return 0;
+
+	if (sharp_nt->backlight) {
+		sharp_nt->backlight->props.power = FB_BLANK_UNBLANK;
+		backlight_update_status(sharp_nt->backlight);
+	}
+
+	sharp_nt->enabled = true;
+
+	return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+	.clock = 41118,
+	.hdisplay = 540,
+	.hsync_start = 540 + 48,
+	.hsync_end = 540 + 48 + 80,
+	.htotal = 540 + 48 + 80 + 32,
+	.vdisplay = 960,
+	.vsync_start = 960 + 3,
+	.vsync_end = 960 + 3 + 15,
+	.vtotal = 960 + 3 + 15 + 1,
+	.vrefresh = 60,
+};
+
+static int sharp_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 = 54;
+	panel->connector->display_info.height_mm = 95;
+
+	return 1;
+}
+
+static const struct drm_panel_funcs sharp_nt_panel_funcs = {
+	.disable = sharp_nt_panel_disable,
+	.unprepare = sharp_nt_panel_unprepare,
+	.prepare = sharp_nt_panel_prepare,
+	.enable = sharp_nt_panel_enable,
+	.get_modes = sharp_nt_panel_get_modes,
+};
+
+static int sharp_nt_panel_add(struct sharp_nt_panel *sharp_nt)
+{
+	struct device *dev = &sharp_nt->dsi->dev;
+	struct device_node *np;
+	int ret;
+
+	sharp_nt->mode = &default_mode;
+
+	sharp_nt->supply = devm_regulator_get(dev, "avdd");
+	if (IS_ERR(sharp_nt->supply))
+		return PTR_ERR(sharp_nt->supply);
+
+	sharp_nt->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(sharp_nt->reset_gpio)) {
+		dev_err(dev, "cannot get reset-gpios %ld\n",
+			PTR_ERR(sharp_nt->reset_gpio));
+		sharp_nt->reset_gpio = NULL;
+	} else {
+		gpiod_set_value(sharp_nt->reset_gpio, 0);
+	}
+
+	np = of_parse_phandle(dev->of_node, "backlight", 0);
+	if (np) {
+		sharp_nt->backlight = of_find_backlight_by_node(np);
+		of_node_put(np);
+
+		if (!sharp_nt->backlight)
+			return -EPROBE_DEFER;
+	}
+
+	drm_panel_init(&sharp_nt->base);
+	sharp_nt->base.funcs = &sharp_nt_panel_funcs;
+	sharp_nt->base.dev = &sharp_nt->dsi->dev;
+
+	ret = drm_panel_add(&sharp_nt->base);
+	if (ret < 0)
+		goto put_backlight;
+
+	return 0;
+
+put_backlight:
+	if (sharp_nt->backlight)
+		put_device(&sharp_nt->backlight->dev);
+
+	return ret;
+}
+
+static void sharp_nt_panel_del(struct sharp_nt_panel *sharp_nt)
+{
+	if (sharp_nt->base.dev)
+		drm_panel_remove(&sharp_nt->base);
+
+	if (sharp_nt->backlight)
+		put_device(&sharp_nt->backlight->dev);
+}
+
+static int sharp_nt_panel_probe(struct mipi_dsi_device *dsi)
+{
+	struct sharp_nt_panel *sharp_nt;
+	int ret;
+
+	dsi->lanes = 2;
+	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_EOT_PACKET;
+
+	sharp_nt = devm_kzalloc(&dsi->dev, sizeof(*sharp_nt), GFP_KERNEL);
+	if (!sharp_nt)
+		return -ENOMEM;
+
+	mipi_dsi_set_drvdata(dsi, sharp_nt);
+
+	sharp_nt->dsi = dsi;
+
+	ret = sharp_nt_panel_add(sharp_nt);
+	if (ret < 0)
+		return ret;
+
+	return mipi_dsi_attach(dsi);
+}
+
+static int sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = sharp_nt_panel_disable(&sharp_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(&sharp_nt->base);
+	sharp_nt_panel_del(sharp_nt);
+
+	return 0;
+}
+
+static void sharp_nt_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+	struct sharp_nt_panel *sharp_nt = mipi_dsi_get_drvdata(dsi);
+
+	sharp_nt_panel_disable(&sharp_nt->base);
+}
+
+static const struct of_device_id sharp_nt_of_match[] = {
+	{ .compatible = "sharp,ls043t1le01-qhd", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sharp_nt_of_match);
+
+static struct mipi_dsi_driver sharp_nt_panel_driver = {
+	.driver = {
+		.name = "panel-sharp-ls043t1le01-qhd",
+		.of_match_table = sharp_nt_of_match,
+	},
+	.probe = sharp_nt_panel_probe,
+	.remove = sharp_nt_panel_remove,
+	.shutdown = sharp_nt_panel_shutdown,
+};
+module_mipi_dsi_driver(sharp_nt_panel_driver);
+
+MODULE_AUTHOR("Werner Johansson <[e-mail]>");
+MODULE_DESCRIPTION("Sharp LS043T1LE01 NT35565-based qHD (540x960) video mode panel driver");
+MODULE_LICENSE("GPL v2");