From a19125a281128c836faae249c1001eb8d7a18b48 Mon Sep 17 00:00:00 2001
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Date: Wed, 1 Sep 2021 19:31:14 +0200
Subject: [PATCH] drm/panel: Add BOE BF060Y8M-AJ0 5.99" AMOLED panel driver

This adds support for the BOE BF060Y8M-AJ0 5.99" AMOLED module
that can be found in some F(x)Tec Pro1 and Elephone U1 devices.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210901173115.998628-1-angelogioacchino.delregno@somainline.org
---
 drivers/gpu/drm/panel/Kconfig                 |  11 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-boe-bf060y8m-aj0.c    | 445 ++++++++++++++++++
 3 files changed, 457 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index bb41dca779491..980aff42000ac 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -37,6 +37,17 @@ config DRM_PANEL_ASUS_Z00T_TM5P5_NT35596
 	  NT35596 1080x1920 video mode panel as found in some Asus
 	  Zenfone 2 Laser Z00T devices.
 
+config DRM_PANEL_BOE_BF060Y8M_AJ0
+	tristate "Boe BF060Y8M-AJ0 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 Boe BF060Y8M-AJ0
+	  5.99" AMOLED modules. The panel has a 1080x2160 resolution and
+	  uses 24 bit RGB per pixel. It provides a MIPI DSI interface to
+	  the host and backlight is controlled through DSI commands.
+
 config DRM_PANEL_BOE_HIMAX8279D
 	tristate "Boe Himax8279d panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 50f494e63f1aa..3388c8f206b07 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -2,6 +2,7 @@
 obj-$(CONFIG_DRM_PANEL_ABT_Y030XX067A) += panel-abt-y030xx067a.o
 obj-$(CONFIG_DRM_PANEL_ARM_VERSATILE) += panel-arm-versatile.o
 obj-$(CONFIG_DRM_PANEL_ASUS_Z00T_TM5P5_NT35596) += panel-asus-z00t-tm5p5-n35596.o
+obj-$(CONFIG_DRM_PANEL_BOE_BF060Y8M_AJ0) += panel-boe-bf060y8m-aj0.o
 obj-$(CONFIG_DRM_PANEL_BOE_HIMAX8279D) += panel-boe-himax8279d.o
 obj-$(CONFIG_DRM_PANEL_BOE_TV101WUM_NL6) += panel-boe-tv101wum-nl6.o
 obj-$(CONFIG_DRM_PANEL_DSI_CM) += panel-dsi-cm.o
diff --git a/drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c b/drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c
new file mode 100644
index 0000000000000..ef00cd67dc407
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-boe-bf060y8m-aj0.c
@@ -0,0 +1,445 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * BOE BF060Y8M-AJ0 5.99" MIPI-DSI OLED Panel on SW43404 DriverIC
+ *
+ * Copyright (c) 2020 AngeloGioacchino Del Regno
+ *                    <angelogioacchino.delregno@somainline.org>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+#include <video/mipi_display.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#define DCS_ALLOW_HBM_RANGE		0x0c
+#define DCS_DISALLOW_HBM_RANGE		0x08
+
+enum boe_bf060y8m_aj0_supplies {
+	BF060Y8M_VREG_VCC,
+	BF060Y8M_VREG_VDDIO,
+	BF060Y8M_VREG_VCI,
+	BF060Y8M_VREG_EL_VDD,
+	BF060Y8M_VREG_EL_VSS,
+	BF060Y8M_VREG_MAX
+};
+
+struct boe_bf060y8m_aj0 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data vregs[BF060Y8M_VREG_MAX];
+	struct gpio_desc *reset_gpio;
+	bool prepared;
+};
+
+static inline
+struct boe_bf060y8m_aj0 *to_boe_bf060y8m_aj0(struct drm_panel *panel)
+{
+	return container_of(panel, struct boe_bf060y8m_aj0, panel);
+}
+
+#define dsi_dcs_write_seq(dsi, seq...) do {				\
+		static const u8 d[] = { seq };				\
+		int ret;						\
+		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+static void boe_bf060y8m_aj0_reset(struct boe_bf060y8m_aj0 *boe)
+{
+	gpiod_set_value_cansleep(boe->reset_gpio, 0);
+	usleep_range(2000, 3000);
+	gpiod_set_value_cansleep(boe->reset_gpio, 1);
+	usleep_range(15000, 16000);
+	gpiod_set_value_cansleep(boe->reset_gpio, 0);
+	usleep_range(5000, 6000);
+}
+
+static int boe_bf060y8m_aj0_on(struct boe_bf060y8m_aj0 *boe)
+{
+	struct mipi_dsi_device *dsi = boe->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi_dcs_write_seq(dsi, 0xb0, 0xa5, 0x00);
+	dsi_dcs_write_seq(dsi, 0xb2, 0x00, 0x4c);
+	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_3D_CONTROL, 0x10);
+	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, DCS_ALLOW_HBM_RANGE);
+	dsi_dcs_write_seq(dsi, 0xf8,
+			  0x00, 0x08, 0x10, 0x00, 0x22, 0x00, 0x00, 0x2d);
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(30);
+
+	dsi_dcs_write_seq(dsi, 0xb0, 0xa5, 0x00);
+	dsi_dcs_write_seq(dsi, 0xc0,
+			  0x08, 0x48, 0x65, 0x33, 0x33, 0x33,
+			  0x2a, 0x31, 0x39, 0x20, 0x09);
+	dsi_dcs_write_seq(dsi, 0xc1, 0x00, 0x00, 0x00, 0x1f, 0x1f,
+			  0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f,
+			  0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f);
+	dsi_dcs_write_seq(dsi, 0xe2, 0x20, 0x04, 0x10, 0x12, 0x92,
+			  0x4f, 0x8f, 0x44, 0x84, 0x83, 0x83, 0x83,
+			  0x5c, 0x5c, 0x5c);
+	dsi_dcs_write_seq(dsi, 0xde, 0x01, 0x2c, 0x00, 0x77, 0x3e);
+
+	msleep(30);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+	msleep(50);
+
+	return 0;
+}
+
+static int boe_bf060y8m_aj0_off(struct boe_bf060y8m_aj0 *boe)
+{
+	struct mipi_dsi_device *dsi = boe->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	/* OFF commands sent in HS mode */
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display off: %d\n", ret);
+		return ret;
+	}
+	msleep(20);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+		return ret;
+	}
+	usleep_range(1000, 2000);
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static int boe_bf060y8m_aj0_prepare(struct drm_panel *panel)
+{
+	struct boe_bf060y8m_aj0 *boe = to_boe_bf060y8m_aj0(panel);
+	struct device *dev = &boe->dsi->dev;
+	int ret;
+
+	if (boe->prepared)
+		return 0;
+
+	/*
+	 * Enable EL Driving Voltage first - doing that at the beginning
+	 * or at the end of the power sequence doesn't matter, so enable
+	 * it here to avoid yet another usleep at the end.
+	 */
+	ret = regulator_enable(boe->vregs[BF060Y8M_VREG_EL_VDD].consumer);
+	if (ret)
+		return ret;
+	ret = regulator_enable(boe->vregs[BF060Y8M_VREG_EL_VSS].consumer);
+	if (ret)
+		goto err_elvss;
+
+	ret = regulator_enable(boe->vregs[BF060Y8M_VREG_VCC].consumer);
+	if (ret)
+		goto err_vcc;
+	usleep_range(1000, 2000);
+	ret = regulator_enable(boe->vregs[BF060Y8M_VREG_VDDIO].consumer);
+	if (ret)
+		goto err_vddio;
+	usleep_range(500, 1000);
+	ret = regulator_enable(boe->vregs[BF060Y8M_VREG_VCI].consumer);
+	if (ret)
+		goto err_vci;
+	usleep_range(2000, 3000);
+
+	boe_bf060y8m_aj0_reset(boe);
+
+	ret = boe_bf060y8m_aj0_on(boe);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(boe->reset_gpio, 1);
+		return ret;
+	}
+
+	boe->prepared = true;
+	return 0;
+
+err_vci:
+	regulator_disable(boe->vregs[BF060Y8M_VREG_VDDIO].consumer);
+err_vddio:
+	regulator_disable(boe->vregs[BF060Y8M_VREG_VCC].consumer);
+err_vcc:
+	regulator_disable(boe->vregs[BF060Y8M_VREG_EL_VSS].consumer);
+err_elvss:
+	regulator_disable(boe->vregs[BF060Y8M_VREG_EL_VDD].consumer);
+	return ret;
+}
+
+static int boe_bf060y8m_aj0_unprepare(struct drm_panel *panel)
+{
+	struct boe_bf060y8m_aj0 *boe = to_boe_bf060y8m_aj0(panel);
+	struct device *dev = &boe->dsi->dev;
+	int ret;
+
+	if (!boe->prepared)
+		return 0;
+
+	ret = boe_bf060y8m_aj0_off(boe);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(boe->reset_gpio, 1);
+	ret = regulator_bulk_disable(ARRAY_SIZE(boe->vregs), boe->vregs);
+
+	boe->prepared = false;
+	return 0;
+}
+
+static const struct drm_display_mode boe_bf060y8m_aj0_mode = {
+	.clock = 165268,
+	.hdisplay = 1080,
+	.hsync_start = 1080 + 36,
+	.hsync_end = 1080 + 36 + 24,
+	.htotal = 1080 + 36 + 24 + 96,
+	.vdisplay = 2160,
+	.vsync_start = 2160 + 16,
+	.vsync_end = 2160 + 16 + 1,
+	.vtotal = 2160 + 16 + 1 + 15,
+	.width_mm = 68,   /* 68.04 mm */
+	.height_mm = 136, /* 136.08 mm */
+};
+
+static int boe_bf060y8m_aj0_get_modes(struct drm_panel *panel,
+				      struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &boe_bf060y8m_aj0_mode);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs boe_bf060y8m_aj0_panel_funcs = {
+	.prepare = boe_bf060y8m_aj0_prepare,
+	.unprepare = boe_bf060y8m_aj0_unprepare,
+	.get_modes = boe_bf060y8m_aj0_get_modes,
+};
+
+static int boe_bf060y8m_aj0_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness = backlight_get_brightness(bl);
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_brightness(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int boe_bf060y8m_aj0_bl_get_brightness(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi = bl_get_data(bl);
+	u16 brightness;
+	int ret;
+
+	ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
+	if (ret < 0)
+		return ret;
+
+	return brightness & 0xff;
+}
+
+static const struct backlight_ops boe_bf060y8m_aj0_bl_ops = {
+	.update_status = boe_bf060y8m_aj0_bl_update_status,
+	.get_brightness = boe_bf060y8m_aj0_bl_get_brightness,
+};
+
+static struct backlight_device *
+boe_bf060y8m_aj0_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	const struct backlight_properties props = {
+		.type = BACKLIGHT_RAW,
+		.brightness = 127,
+		.max_brightness = 255,
+		.scale = BACKLIGHT_SCALE_NON_LINEAR,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &boe_bf060y8m_aj0_bl_ops, &props);
+}
+
+static int boe_bf060y8m_aj0_init_vregs(struct boe_bf060y8m_aj0 *boe,
+				       struct device *dev)
+{
+	struct regulator *vreg;
+	int ret;
+
+	boe->vregs[BF060Y8M_VREG_VCC].supply = "vcc";
+	boe->vregs[BF060Y8M_VREG_VDDIO].supply = "vddio";
+	boe->vregs[BF060Y8M_VREG_VCI].supply = "vci";
+	boe->vregs[BF060Y8M_VREG_EL_VDD].supply = "elvdd";
+	boe->vregs[BF060Y8M_VREG_EL_VSS].supply = "elvss";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(boe->vregs),
+				      boe->vregs);
+	if (ret < 0) {
+		dev_err(dev, "Failed to get regulators: %d\n", ret);
+		return ret;
+	}
+
+	vreg = boe->vregs[BF060Y8M_VREG_VCC].consumer;
+	ret = regulator_is_supported_voltage(vreg, 2700000, 3600000);
+	if (!ret)
+		return ret;
+
+	vreg = boe->vregs[BF060Y8M_VREG_VDDIO].consumer;
+	ret = regulator_is_supported_voltage(vreg, 1620000, 1980000);
+	if (!ret)
+		return ret;
+
+	vreg = boe->vregs[BF060Y8M_VREG_VCI].consumer;
+	ret = regulator_is_supported_voltage(vreg, 2600000, 3600000);
+	if (!ret)
+		return ret;
+
+	vreg = boe->vregs[BF060Y8M_VREG_EL_VDD].consumer;
+	ret = regulator_is_supported_voltage(vreg, 4400000, 4800000);
+	if (!ret)
+		return ret;
+
+	/* ELVSS is negative: -5.00V to -1.40V */
+	vreg = boe->vregs[BF060Y8M_VREG_EL_VSS].consumer;
+	ret = regulator_is_supported_voltage(vreg, 1400000, 5000000);
+	if (!ret)
+		return ret;
+
+	/*
+	 * Set min/max rated current, known only for VCI and VDDIO and,
+	 * in case of failure, just go on gracefully, as this step is not
+	 * guaranteed to succeed on all regulator HW but do a debug print
+	 * to inform the developer during debugging.
+	 * In any case, these two supplies are also optional, so they may
+	 * be fixed-regulator which, at the time of writing, does not
+	 * support fake current limiting.
+	 */
+	vreg = boe->vregs[BF060Y8M_VREG_VDDIO].consumer;
+	ret = regulator_set_current_limit(vreg, 1500, 2500);
+	if (ret)
+		dev_dbg(dev, "Current limit cannot be set on %s: %d\n",
+			boe->vregs[1].supply, ret);
+
+	vreg = boe->vregs[BF060Y8M_VREG_VCI].consumer;
+	ret = regulator_set_current_limit(vreg, 20000, 40000);
+	if (ret)
+		dev_dbg(dev, "Current limit cannot be set on %s: %d\n",
+			boe->vregs[2].supply, ret);
+
+	return 0;
+}
+
+static int boe_bf060y8m_aj0_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct boe_bf060y8m_aj0 *boe;
+	int ret;
+
+	boe = devm_kzalloc(dev, sizeof(*boe), GFP_KERNEL);
+	if (!boe)
+		return -ENOMEM;
+
+	ret = boe_bf060y8m_aj0_init_vregs(boe, dev);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to initialize supplies.\n");
+
+	boe->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(boe->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(boe->reset_gpio),
+				     "Failed to get reset-gpios\n");
+
+	boe->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, boe);
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_NO_EOT_PACKET |
+			  MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+			  MIPI_DSI_CLOCK_NON_CONTINUOUS |
+			  MIPI_DSI_MODE_LPM;
+
+	drm_panel_init(&boe->panel, dev, &boe_bf060y8m_aj0_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	boe->panel.backlight = boe_bf060y8m_aj0_create_backlight(dsi);
+	if (IS_ERR(boe->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(boe->panel.backlight),
+				     "Failed to create backlight\n");
+
+	drm_panel_add(&boe->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int boe_bf060y8m_aj0_remove(struct mipi_dsi_device *dsi)
+{
+	struct boe_bf060y8m_aj0 *boe = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_remove(&boe->panel);
+
+	return 0;
+}
+
+static const struct of_device_id boe_bf060y8m_aj0_of_match[] = {
+	{ .compatible = "boe,bf060y8m-aj0" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, boe_bf060y8m_aj0_of_match);
+
+static struct mipi_dsi_driver boe_bf060y8m_aj0_driver = {
+	.probe = boe_bf060y8m_aj0_probe,
+	.remove = boe_bf060y8m_aj0_remove,
+	.driver = {
+		.name = "panel-sw43404-boe-fhd-amoled",
+		.of_match_table = boe_bf060y8m_aj0_of_match,
+	},
+};
+module_mipi_dsi_driver(boe_bf060y8m_aj0_driver);
+
+MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>");
+MODULE_DESCRIPTION("BOE BF060Y8M-AJ0 MIPI-DSI OLED panel");
+MODULE_LICENSE("GPL v2");
-- 
2.30.2