wip: add lg sw43408 panel

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>

4 files changed, 578 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 57f496cff999..f9f53dce0649 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5033,6 +5033,13 @@ S:	Orphan / Obsolete
 F:	drivers/gpu/drm/i810/
 F:	include/uapi/drm/i810_drm.h
 
+DRM DRIVER FOR LG SW43408 PANELS
+M:      Sumit Semwal <sumit.semwal@linaro.org>
+T:      git git://anongit.freedesktop.org/drm/drm-misc
+S:      Maintained
+F:      drivers/gpu/drm/panel/panel-lg-sw43408.c
+F:      Documentation/devicetree/bindings/display/panel/lg,sw43408-panel.txt
+
 DRM DRIVER FOR MATROX G200/G400 GRAPHICS CARDS
 S:	Orphan / Obsolete
 F:	drivers/gpu/drm/mga/
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index e281fc544742..24c762e1e203 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -98,6 +98,17 @@ config DRM_PANEL_KINGDISPLAY_KD097D04
 	  24 bit RGB per pixel. It provides a MIPI DSI interface to
 	  the host and has a built-in LED backlight.
 
+config DRM_PANEL_LG_SW43408
+	tristate "LG SW43408 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 LG sw43408 panel.
+	  The panel has a 1080x2160 resolution and uses
+	  24 bit RGB per pixel. It provides a MIPI DSI interface to
+	  the host and has a built-in LED backlight.
+
 config DRM_PANEL_SAMSUNG_LD9040
 	tristate "Samsung LD9040 RGB/SPI panel"
 	depends on OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 78e3dc376bdd..61169b3ea684 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
 obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o
 obj-$(CONFIG_DRM_PANEL_KINGDISPLAY_KD097D04) += panel-kingdisplay-kd097d04.o
 obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
+obj-$(CONFIG_DRM_PANEL_LG_SW43408) += panel-lg-sw43408.o
 obj-$(CONFIG_DRM_PANEL_OLIMEX_LCD_OLINUXINO) += panel-olimex-lcd-olinuxino.o
 obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o
 obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
diff --git a/drivers/gpu/drm/panel/panel-lg-sw43408.c b/drivers/gpu/drm/panel/panel-lg-sw43408.c
new file mode 100644
index 000000000000..6f1857de0904
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-lg-sw43408.c
@@ -0,0 +1,559 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Linaro Ltd
+ * Author: Sumit Semwal <sumit.semwal@linaro.org>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_device.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#include <video/mipi_display.h>
+
+/*
+to figure out:
+ - reset_gpio - is ACTIVE_HIGH 
+ - does the panel need to set lab-supply?
+ - looks like clocks are taken care of in drivers/gpu/drm/msm/dsi/dsi_host,
+ - do we need pinctrl for panel, or does the dsi_host one suffice?
+
+dsi_sw43408_cmd_display: qcom,dsi-display@51 {
+                compatible = "qcom,dsi-display";
+                label = "dsi_sw43408_cmd_display";
+                qcom,display-type = "primary";
+
+                qcom,dsi-ctrl = <&mdss_dsi0>;
+                qcom,dsi-phy = <&mdss_dsi_phy0>;
+                clocks = <&mdss_dsi0_pll BYTECLK_MUX_0_CLK>,
+                        <&mdss_dsi0_pll PCLK_MUX_0_CLK>;
+                clock-names = "src_byte_clk", "src_pixel_clk";
+
+                pinctrl-names = "panel_active", "panel_suspend";
+                pinctrl-0 = <&sde_dsi_active &sde_te_active>;
+                pinctrl-1 = <&sde_dsi_suspend &sde_te_suspend>;
+
+                qcom,dsi-panel = <&dsi_sw43408_dsc_fhd_cmd>;
+
+                vddi-supply = <&pm8998_l14>;
+                vpnl-supply = <&pm8998_l28>;
+                lab-supply = <&lab_regulator>;
+};
+
+&dsi_sw43408_dsc_fhd_cmd {
+        qcom,panel-supply-entries = <&dsi_panel_pwr_supply_sw43408>;
+        qcom,mdss-dsi-t-clk-post = <0x09>;
+        qcom,mdss-dsi-t-clk-pre = <0x1A>;
+
+        qcom,platform-reset-gpio = <&tlmm 6 0>;
+        qcom,mdss-dsi-display-timings {
+                timing@0 {
+                        qcom,mdss-dsi-panel-phy-timings =
+                                        [00 0E 03 03 1E 1D 04 04 02 03 04 00];
+                };
+        };
+};
+
+*/
+
+struct panel_cmd {
+	size_t len;
+	const char *data;
+};
+
+#define _INIT_CMD(...) { \
+	.len = sizeof((char[]){__VA_ARGS__}), \
+	.data = (char[]){__VA_ARGS__} }
+
+static const char * const regulator_names[] = {
+	"vddi",
+	"vpnl",
+//	"lab", // Validate the name
+};
+
+static unsigned long const regulator_enable_loads[] = {
+	62000,
+	857000,
+//	0,	// Confirm this value
+};
+
+static unsigned long const regulator_disable_loads[] = {
+	80,
+	0,
+//	0,	// confirm this value
+};
+
+struct panel_desc {
+	const struct drm_display_mode *display_mode;
+	const char *panel_name;
+
+	unsigned int width_mm;
+	unsigned int height_mm;
+
+	unsigned long mode_flags;
+	enum mipi_dsi_pixel_format format;
+	unsigned int lanes;
+
+	const struct panel_cmd *on_cmds;
+};
+
+struct panel_info {
+	struct drm_panel base;
+	struct mipi_dsi_device *link;
+	const struct panel_desc *desc;
+
+	struct backlight_device *backlight;
+
+	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+
+	struct gpio_desc *reset_gpio;
+
+	bool prepared;
+	bool enabled;
+};
+
+static inline struct panel_info *to_panel_info(struct drm_panel *panel)
+{
+	return container_of(panel, struct panel_info, base);
+}
+
+static int send_mipi_cmds(struct drm_panel *panel, const struct panel_cmd *cmds)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	unsigned int i = 0;
+	int err;
+
+	if (!cmds)
+		return -EFAULT;
+
+	for (i = 0; cmds[i].len != 0; i++) {
+		const struct panel_cmd *cmd = &cmds[i];
+
+		if (cmd->len == 2)
+			err = mipi_dsi_dcs_write(pinfo->link,
+						    cmd->data[1], NULL, 0);
+		else
+			err = mipi_dsi_dcs_write(pinfo->link,
+						    cmd->data[1], cmd->data + 2,
+						    cmd->len - 2);
+
+		if (err < 0)
+			return err;
+
+		usleep_range((cmd->data[0]) * 1000,
+			    (1 + cmd->data[0]) * 1000);
+	}
+
+	return 0;
+}
+
+static int lg_panel_disable(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+
+	backlight_disable(pinfo->backlight);
+
+	pinfo->enabled = false;
+
+	return 0;
+}
+
+static int lg_panel_power_off(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	int i, ret = 0;
+
+	gpiod_set_value(pinfo->reset_gpio, 0);
+
+	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
+		ret = regulator_set_load(pinfo->supplies[i].consumer,
+				regulator_disable_loads[i]);
+		if (ret) {
+			DRM_DEV_ERROR(panel->dev,
+				"regulator_set_load failed %d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
+	if (ret) {
+		DRM_DEV_ERROR(panel->dev,
+			"regulator_bulk_disable failed %d\n", ret);
+	}
+	return ret;
+}
+
+static int lg_panel_unprepare(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	int ret;
+
+	if (!pinfo->prepared)
+		return 0;
+
+	ret = mipi_dsi_dcs_write(pinfo->link, MIPI_DCS_SET_DISPLAY_OFF, NULL, 0);
+	if (ret < 0) {
+		DRM_DEV_ERROR(panel->dev,
+			"set_display_off cmd failed ret = %d\n",
+			ret);
+	}
+
+	/* 120ms delay required here as per DCS spec */
+	msleep(120);
+
+	ret = mipi_dsi_dcs_write(pinfo->link, MIPI_DCS_ENTER_SLEEP_MODE, NULL, 0);
+	if (ret < 0) {
+		DRM_DEV_ERROR(panel->dev,
+			"enter_sleep cmd failed ret = %d\n", ret);
+	}
+
+	ret = lg_panel_power_off(panel);
+	if (ret < 0)
+		DRM_DEV_ERROR(panel->dev, "power_off failed ret = %d\n", ret);
+
+	pinfo->prepared = false;
+
+	return ret;
+
+}
+
+static int lg_panel_power_on(struct panel_info *pinfo)
+{
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++) {
+		ret = regulator_set_load(pinfo->supplies[i].consumer,
+					regulator_enable_loads[i]);
+		if (ret)
+			return ret;
+	}
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(pinfo->supplies), pinfo->supplies);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Reset sequence of LG sw43408 panel requires the panel to be
+	 * out of reset for 9ms, followed by being held in reset
+	 * for 1ms and then out again
+	 * Check: value to set - 0 or 1?
+	 */
+	gpiod_set_value(pinfo->reset_gpio, 1);
+	usleep_range(9000, 10000);
+	gpiod_set_value(pinfo->reset_gpio, 0);
+	usleep_range(1000, 2000);
+	gpiod_set_value(pinfo->reset_gpio, 1);
+	usleep_range(9000, 10000);
+
+	return 0;
+}
+
+static int lg_panel_prepare(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	int err;
+
+	if (pinfo->prepared)
+		return 0;
+
+	err = lg_panel_power_on(pinfo);
+	if (err < 0)
+		goto poweroff;
+
+	/* send init code */
+	err = send_mipi_cmds(panel, pinfo->desc->on_cmds);
+	if (err < 0) {
+		DRM_DEV_ERROR(panel->dev,
+				"failed to send DCS Init Code: %d\n", err);
+		goto poweroff;
+	}
+
+	pinfo->prepared = true;
+
+	return 0;
+
+poweroff:
+	gpiod_set_value(pinfo->reset_gpio, 1);
+	return err;
+}
+
+static int lg_panel_enable(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	int ret;
+
+	if (pinfo->enabled)
+		return 0;
+
+	ret = backlight_enable(pinfo->backlight);
+	if (ret) {
+		DRM_DEV_ERROR(panel->drm->dev,
+				"Failed to enable backlight %d\n", ret);
+		return ret;
+	}
+
+	pinfo->enabled = true;
+
+	return 0;
+}
+
+static int lg_panel_get_modes(struct drm_panel *panel)
+{
+	struct panel_info *pinfo = to_panel_info(panel);
+	const struct drm_display_mode *m = pinfo->desc->display_mode;
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(panel->drm, m);
+	if (!mode) {
+		DRM_DEV_ERROR(panel->drm->dev, "failed to add mode %ux%u@%u\n",
+				m->hdisplay, m->vdisplay, m->vrefresh);
+		return -ENOMEM;
+	}
+
+	panel->connector->display_info.width_mm = pinfo->desc->width_mm;
+	panel->connector->display_info.height_mm = pinfo->desc->height_mm;
+
+	drm_mode_set_name(mode);
+	drm_mode_probed_add(panel->connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs panel_funcs = {
+	.disable = lg_panel_disable,
+	.unprepare = lg_panel_unprepare,
+	.prepare = lg_panel_prepare,
+	.enable = lg_panel_enable,
+	.get_modes = lg_panel_get_modes,
+};
+
+/* The on_cmds sequence is translated from the below table, taken from
+   pixel3 panel driver dts:
+qcom,mdss-dsi-on-command = [
+	15 01 00 00 00 00 02 26 02 => MIPI_DSI_SET_GAMMA_CURVE, 0x02
+	15 01 00 00 00 00 02 35 00 => MIPI_DSI_SET_TEAR_ON
+	39 01 00 00 00 00 03 53 0C 30 => as-is; 
+	39 01 00 00 00 00 07 55 00 70 DF 00 70 DF => as-is;
+	39 01 00 00 00 00 04 F7 01 49 0C => as-is
+	05 01 00 00 87 00 01 11 => MIPI_DCS_EXIT_SLEEP_MODE
+	07 01 00 00 00 00 01 11 =??
+	15 01 00 00 00 00 02 B0 AC 
+	39 01 00 00 00 00 13 CD
+		00 00 00 19 19 19 19 19
+		19 19 19 19 19 19 19 19
+		16 16
+	39 01 00 00 00 00 06 CB 80 5C 07 03 28
+	39 01 00 00 00 00 04 C0 02 02 0F
+	39 01 00 00 00 00 08 E5
+		00 3A 00 3A 00 0E 10
+	39 01 00 00 00 00 2A B5
+		75 60 2D 5D 80 00 0A 0B
+		00 05 0B 00 80 0D 0E 40
+		00 0C 00 16 00 B8 00 80
+		0D 0E 40 00 0C 00 16 00
+		B8 00 81 00 03 03 03 01
+		01
+	39 01 00 00 00 00 07 55 04 61 DB 04 70 DB
+	15 01 00 00 00 00 02 B0 CA
+	05 01 00 00 32 00 01 29 => MIPI_DCS_SET_DISPLAY_ON
+];
+*/
+
+static const struct panel_cmd lg_sw43408_on_cmds[] = {
+	_INIT_CMD(0x00, 0x26, 0x02),	// MIPI_DCS_SET_GAMMA_CURVE, 0x02
+	_INIT_CMD(0x00, 0x35, 0x00),	// MIPI_DCS_SET_TEAR_ON
+	_INIT_CMD(0x00, 0x53, 0x0C, 0x30),
+	_INIT_CMD(0x00, 0x55, 0x00, 0x70, 0xDF, 0x00, 0x70, 0xDF),
+	_INIT_CMD(0x00, 0xF7, 0x01, 0x49, 0x0C),
+	_INIT_CMD(0x00, 0x11),	// MIPI_DCS_EXIT_SLEEP_MODE
+	_INIT_CMD(0x00, 0x11),	// repetition, but what does a 07 DTYPE mean?
+	_INIT_CMD(0x00, 0xB0, 0xAC),
+	_INIT_CMD(0x00, 0xCD,
+			0x00, 0x00, 0x00, 0x19, 0x19, 0x19, 0x19, 0x19,
+			0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
+			0x16, 0x16),
+	_INIT_CMD(0x00, 0xCB, 0x80, 0x5C, 0x07, 0x03, 0x28),
+	_INIT_CMD(0x00, 0xC0, 0x02, 0x02, 0x0F),
+	_INIT_CMD(0x00, 0xE5, 0x00, 0x3A, 0x00, 0x3A, 0x00, 0x0E, 0x10),
+	_INIT_CMD(0x00, 0xB5,
+			0x75, 0x60, 0x2D, 0x5D, 0x80, 0x00, 0x0A, 0x0B,
+			0x00, 0x05, 0x0B, 0x00, 0x80, 0x0D, 0x0E, 0x40,
+			0x00, 0x0C, 0x00, 0x16, 0x00, 0xB8, 0x00, 0x80,
+			0x0D, 0x0E, 0x40, 0x00, 0x0C, 0x00, 0x16, 0x00,
+			0xB8, 0x00, 0x81, 0x00, 0x03, 0x03, 0x03, 0x01,
+			0x01),
+	_INIT_CMD(0x00, 0x55, 0x04, 0x61, 0xDB, 0x04, 0x70, 0xDB),
+	_INIT_CMD(0x00, 0xB0, 0xCA),
+	_INIT_CMD(0x00, 0x29),
+
+	{},
+};
+
+
+
+
+static const struct drm_display_mode lg_panel_default_mode = {
+	.clock		= 152340,
+
+	.hdisplay	= 1080,
+	.hsync_start	= 1080 + 20,
+	.hsync_end	= 1080 + 20 + 32,
+	.htotal		= 1080 + 20 + 32 + 20,
+
+	.vdisplay	= 2160,
+	.vsync_start	= 2160 + 20,
+	.vsync_end	= 2160 + 20 + 4,
+	.vtotal		= 2160 + 20 + 4 + 20,
+	.vrefresh	= 60,
+
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static const struct panel_desc lg_panel_desc = {
+	.display_mode = &lg_panel_default_mode,
+
+	.width_mm = 62,
+	.height_mm = 124,
+
+	.mode_flags = MIPI_DSI_MODE_LPM,
+	.format = MIPI_DSI_FMT_RGB888,
+	.lanes = 4,
+	.on_cmds = lg_sw43408_on_cmds,
+};
+
+
+static const struct of_device_id panel_of_match[] = {
+	{ .compatible = "lg,sw43408",
+	  .data = &lg_panel_desc
+	},
+	{
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, panel_of_match);
+
+static int panel_add(struct panel_info *pinfo)
+{
+	struct device *dev = &pinfo->link->dev;
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(pinfo->supplies); i++)
+		pinfo->supplies[i].supply = regulator_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(pinfo->supplies),
+				      pinfo->supplies);
+	if (ret < 0)
+		return ret;
+
+	pinfo->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(pinfo->reset_gpio)) {
+		DRM_DEV_ERROR(dev, "cannot get reset gpio %ld\n",
+			PTR_ERR(pinfo->reset_gpio));
+		return PTR_ERR(pinfo->reset_gpio);
+	}
+
+	pinfo->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(pinfo->backlight))
+		return PTR_ERR(pinfo->backlight);
+
+	drm_panel_init(&pinfo->base);
+	pinfo->base.funcs = &panel_funcs;
+	pinfo->base.dev = &pinfo->link->dev;
+
+	ret = drm_panel_add(&pinfo->base);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static void panel_del(struct panel_info *pinfo)
+{
+	if (pinfo->base.dev)
+		drm_panel_remove(&pinfo->base);
+}
+
+static int panel_probe(struct mipi_dsi_device *dsi)
+{
+	struct panel_info *pinfo;
+	const struct panel_desc *desc;
+	int err;
+
+	pinfo = devm_kzalloc(&dsi->dev, sizeof(*pinfo), GFP_KERNEL);
+	if (!pinfo)
+		return -ENOMEM;
+
+	desc = of_device_get_match_data(&dsi->dev);
+	dsi->mode_flags = desc->mode_flags;
+	dsi->format = desc->format;
+	dsi->lanes = desc->lanes;
+	pinfo->desc = desc;
+
+	pinfo->link = dsi;
+	mipi_dsi_set_drvdata(dsi, pinfo);
+
+	err = panel_add(pinfo);
+	if (err < 0)
+		return err;
+
+	return mipi_dsi_attach(dsi);
+}
+
+static int panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
+	int err;
+
+	err = lg_panel_unprepare(&pinfo->base);
+	if (err < 0)
+		DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
+				err);
+
+	err = lg_panel_disable(&pinfo->base);
+	if (err < 0)
+		DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
+
+	err = mipi_dsi_detach(dsi);
+	if (err < 0)
+		DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
+				err);
+
+	drm_panel_detach(&pinfo->base);
+	panel_del(pinfo);
+
+	return 0;
+}
+
+static void panel_shutdown(struct mipi_dsi_device *dsi)
+{
+	struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
+
+	lg_panel_disable(&pinfo->base);
+	lg_panel_unprepare(&pinfo->base);
+}
+
+static struct mipi_dsi_driver panel_driver = {
+	.driver = {
+		.name = "panel-lg-sw43408",
+		.of_match_table = panel_of_match,
+	},
+	.probe = panel_probe,
+	.remove = panel_remove,
+	.shutdown = panel_shutdown,
+};
+module_mipi_dsi_driver(panel_driver);
+
+MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
+MODULE_DESCRIPTION("LG SW436408 MIPI-DSI LCD panel");
+MODULE_LICENSE("GPL");