Date: Thu, 20 Jun 2024 19:52:45 +0800
From: Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>
To: dmitry.torokhov@...il.com,
	robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org,
	jikos@...nel.org,
	benjamin.tissoires@...hat.co,
	dianders@...gle.com,
	hsinyi@...gle.com
Cc: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>
Subject: [PATCH v4 2/2] drm/panel: starry-er88577: add new panel driver

The bias IC of this starry-er88577 panel is placed
on the panel side, so when the panel is powered on,
there is no need to control AVDD and AVEE in the driver,
only 3.3v and reset are needed.

Signed-off-by: Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>
---
Chage since V3:
-  1. Adjust the ".clock" assignment format.

v3: https://lore.kernel.org/all/20240614145609.25432-3-lvzhaoxiong@huaqin.corp-partner.google.com/

Chage since V3:
-  Separate Starry-er88577 from the panel-kingdisplay-kd101ne3 driver.
-  Use mipi_dsi_dcs_set_display_on_multi().
-  Use mipi_dsi_dcs_exit_sleep_mode_multi() and mipi_dsi_msleep().

v2: https://lore.kernel.org/all/20240601084528.22502-5-lvzhaoxiong@huaqin.corp-partner.google.com/

Chage since V2:
-  Add compatible for Starry er88577 in panel-kingdisplay-kd101ne3 drivers.

---
 drivers/gpu/drm/panel/Kconfig                |   9 +
 drivers/gpu/drm/panel/Makefile               |   1 +
 drivers/gpu/drm/panel/panel-starry-er88577.c | 343 +++++++++++++++++++
 3 files changed, 353 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-starry-er88577.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index e54f6f5604ed..a52aa2552ab8 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -781,6 +781,15 @@ config DRM_PANEL_SITRONIX_ST7789V
 	  Say Y here if you want to enable support for the Sitronix
 	  ST7789V controller for 240x320 LCD panels
 
+config DRM_PANEL_STARRY_ER88577
+	tristate "Starry er88577 panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y if you want to enable support for panels based on the
+	  Starry er88577 controller.
+
 config DRM_PANEL_SONY_ACX565AKM
 	tristate "Sony ACX565AKM panel"
 	depends on GPIOLIB && OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index f0203f6e02f4..ecd843a6dc6e 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -81,6 +81,7 @@ obj-$(CONFIG_DRM_PANEL_SHARP_LS060T1SX01) += panel-sharp-ls060t1sx01.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
 obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
+obj-$(CONFIG_DRM_PANEL_STARRY_ER88577) += panel-starry-er88577.o
 obj-$(CONFIG_DRM_PANEL_SYNAPTICS_R63353) += panel-synaptics-r63353.o
 obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
 obj-$(CONFIG_DRM_PANEL_SONY_TD4353_JDI) += panel-sony-td4353-jdi.o
diff --git a/drivers/gpu/drm/panel/panel-starry-er88577.c b/drivers/gpu/drm/panel/panel-starry-er88577.c
new file mode 100644
index 000000000000..e6088262ee69
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-starry-er88577.c
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Panels based on the ER88577 display controller.
+ * Author: Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+#include <drm/drm_probe_helper.h>
+
+struct starry_panel;
+
+struct panel_desc {
+	const struct drm_display_mode *modes;
+	unsigned int bpc;
+	unsigned long mode_flags;
+	enum mipi_dsi_pixel_format format;
+	const struct panel_init_cmd *init_cmds;
+	int (*init)(struct starry_panel *starry);
+	unsigned int lanes;
+	bool discharge_on_disable;
+	bool lp11_before_reset;
+	unsigned int power_off_delay_ms;
+};
+
+struct starry_panel {
+	struct drm_panel base;
+	struct mipi_dsi_device *dsi;
+
+	const struct panel_desc *desc;
+
+	enum drm_panel_orientation orientation;
+	struct regulator *vccio;
+	struct gpio_desc *reset;
+};
+
+static int starry_er88577_init(struct starry_panel *starry)
+{
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = starry->dsi };
+
+	/* T5:HWreset to init_code >= 120ms */
+	mipi_dsi_msleep(dsi_ctx, 120);
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe0, 0xab, 0xba);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe1, 0xba, 0xab);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb1, 0x10, 0x01, 0x47, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb2, 0x0c, 0x14, 0x04, 0x50, 0x50, 0x14);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb3, 0x56, 0x53, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb4, 0x33, 0x30, 0x04);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb6, 0xb0, 0x00, 0x00, 0x10, 0x00, 0x10, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb8, 0x05, 0x12, 0x29, 0x49, 0x40);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb9, 0x7c, 0x61, 0x4f, 0x42, 0x3e, 0x2d, 0x31,
+				     0x1a, 0x33, 0x33, 0x33, 0x52, 0x40, 0x47, 0x38, 0x34, 0x26,
+				     0x0e, 0x06, 0x7c, 0x61, 0x4f, 0x42, 0x3e, 0x2d, 0x31, 0x1a,
+				     0x33, 0x33, 0x33, 0x52, 0x40, 0x47, 0x38, 0x34, 0x26, 0x0e,
+				     0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc0, 0xcc, 0x76, 0x12, 0x34, 0x44, 0x44, 0x44,
+				     0x44, 0x98, 0x04, 0x98, 0x04, 0x0f, 0x00, 0x00, 0xc1);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc1, 0x54, 0x94, 0x02, 0x85, 0x9f, 0x00, 0x6f,
+				     0x00, 0x54, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc2, 0x17, 0x09, 0x08, 0x89, 0x08, 0x11, 0x22,
+				     0x20, 0x44, 0xff, 0x18, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc3, 0x87, 0x47, 0x05, 0x05, 0x1c, 0x1c, 0x1d,
+				     0x1d, 0x02, 0x1e, 0x1e, 0x1f, 0x1f, 0x0f, 0x0f, 0x0d, 0x0d,
+				     0x13, 0x13, 0x11, 0x11, 0x24);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc4, 0x06, 0x06, 0x04, 0x04, 0x1c, 0x1c, 0x1d,
+				     0x1d, 0x02, 0x1e, 0x1e, 0x1f, 0x1f, 0x0e, 0x0e, 0x0c, 0x0c,
+				     0x12, 0x12, 0x10, 0x10, 0x24);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc8, 0x21, 0x00, 0x31, 0x42, 0x34, 0x16);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xca, 0xcb, 0x43);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xcd, 0x0e, 0x4b, 0x4b, 0x20, 0x19, 0x6b, 0x06,
+				     0xb3);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xd2, 0xe3, 0x2b, 0x38, 0x08);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xd4, 0x00, 0x01, 0x00, 0x0e, 0x04, 0x44, 0x08,
+				     0x10, 0x00, 0x00, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe6, 0x80, 0x09, 0xff, 0xff, 0xff, 0xff, 0xff,
+				     0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0, 0x12, 0x03, 0x20, 0x00, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf3, 0x00);
+
+	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_msleep(dsi_ctx, 120);
+
+	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
+	mipi_dsi_msleep(dsi_ctx, 20);
+
+	return dsi_ctx.accum_err;
+};
+
+static inline struct starry_panel *to_starry_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct starry_panel, base);
+}
+
+static int starry_panel_disable(struct drm_panel *panel)
+{
+	struct starry_panel *starry = to_starry_panel(panel);
+	struct mipi_dsi_multi_context dsi_ctx = { .dsi = starry->dsi };
+
+	starry->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_msleep(dsi_ctx, 100);
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+
+	mipi_dsi_msleep(dsi_ctx, 50);
+
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+
+	mipi_dsi_msleep(dsi_ctx, 120);
+
+	return dsi_ctx.accum_err;
+}
+
+static int starry_panel_unprepare(struct drm_panel *panel)
+{
+	struct starry_panel *starry = to_starry_panel(panel);
+	int err;
+
+	gpiod_set_value_cansleep(starry->reset, 0);
+
+	/* T15: 2ms */
+	usleep_range(1000, 2000);
+
+	err = regulator_disable(starry->vccio);
+	if (err < 0)
+		return err;
+
+	if (starry->desc->power_off_delay_ms)
+		msleep(starry->desc->power_off_delay_ms);
+
+	return 0;
+}
+
+static int starry_panel_prepare(struct drm_panel *panel)
+{
+	struct starry_panel *starry = to_starry_panel(panel);
+	int err;
+
+	gpiod_set_value(starry->reset, 0);
+
+	err = regulator_enable(starry->vccio);
+	if (err < 0)
+		return err;
+
+	/* T1:Vdd to mipi_lp >= 0ms */
+	usleep_range(5000, 6000);
+
+	if (starry->desc->lp11_before_reset) {
+		err = mipi_dsi_dcs_nop(starry->dsi);
+		if (err < 0)
+			goto poweroff;
+
+		usleep_range(1000, 2000);
+	}
+
+	/* T2: 10ms, T1 + T2 > 60ms */
+	msleep(60);
+
+	gpiod_set_value_cansleep(starry->reset, 1);
+
+	err = starry->desc->init(starry);
+	if (err < 0)
+		goto poweroff;
+
+	return 0;
+
+poweroff:
+	gpiod_set_value(starry->reset, 0);
+		/* T6: 2ms */
+	usleep_range(1000, 2000);
+	regulator_disable(starry->vccio);
+
+	return err;
+}
+
+static int starry_panel_enable(struct drm_panel *panel)
+{
+	msleep(130);
+	return 0;
+}
+
+static const struct drm_display_mode starry_er88577_default_mode = {
+	.clock = (800 + 25 + 25 + 25) * (1280 + 20 + 4 + 12) * 60 / 1000,
+	.hdisplay = 800,
+	.hsync_start = 800 + 25,
+	.hsync_end = 800 + 25 + 25,
+	.htotal = 800 + 25 + 25 + 25,
+	.vdisplay = 1280,
+	.vsync_start = 1280 + 20,
+	.vsync_end = 1280 + 20 + 4,
+	.vtotal = 1280 + 20 + 4 + 12,
+	.width_mm = 135,
+	.height_mm = 216,
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static const struct panel_desc starry_er88577_desc = {
+	.modes = &starry_er88577_default_mode,
+	.bpc = 8,
+	.lanes = 4,
+	.format = MIPI_DSI_FMT_RGB888,
+	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+		      MIPI_DSI_MODE_LPM,
+	.init = starry_er88577_init,
+	.lp11_before_reset = true,
+	.power_off_delay_ms = 1000,
+};
+
+static int starry_panel_get_modes(struct drm_panel *panel,
+			       struct drm_connector *connector)
+{
+	struct starry_panel *starry = to_starry_panel(panel);
+	const struct drm_display_mode *mode = starry->desc->modes;
+
+	return drm_connector_helper_get_modes_fixed(connector, mode);
+}
+
+static enum drm_panel_orientation starry_panel_get_orientation(struct drm_panel *panel)
+{
+	struct starry_panel *starry = to_starry_panel(panel);
+
+	return starry->orientation;
+}
+
+static const struct drm_panel_funcs starry_panel_funcs = {
+	.disable = starry_panel_disable,
+	.unprepare = starry_panel_unprepare,
+	.prepare = starry_panel_prepare,
+	.enable = starry_panel_enable,
+	.get_modes = starry_panel_get_modes,
+	.get_orientation = starry_panel_get_orientation,
+};
+
+static int starry_panel_add(struct starry_panel *starry)
+{
+	struct device *dev = &starry->dsi->dev;
+	int err;
+
+	starry->vccio = devm_regulator_get(dev, "vccio");
+	if (IS_ERR(starry->vccio))
+		return dev_err_probe(dev, PTR_ERR(starry->vccio),
+				     "Cannot get vccio\n");
+
+	starry->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(starry->reset))
+		return dev_err_probe(dev, PTR_ERR(starry->reset),
+				     "Cannot get reset GPIO\n");
+
+	drm_panel_init(&starry->base, dev, &starry_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	err = of_drm_get_panel_orientation(dev->of_node, &starry->orientation);
+	if (err < 0) {
+		dev_err(dev, "%pOF: failed to get orientation %d\n", dev->of_node, err);
+		return err;
+	}
+
+	err = drm_panel_of_backlight(&starry->base);
+	if (err)
+		return err;
+
+	starry->base.funcs = &starry_panel_funcs;
+	starry->base.dev = &starry->dsi->dev;
+
+	drm_panel_add(&starry->base);
+
+	return 0;
+}
+
+static int starry_panel_probe(struct mipi_dsi_device *dsi)
+{
+	struct starry_panel *starry;
+	int ret;
+	const struct panel_desc *desc;
+
+	starry = devm_kzalloc(&dsi->dev, sizeof(*starry), GFP_KERNEL);
+	if (!starry)
+		return -ENOMEM;
+
+	desc = of_device_get_match_data(&dsi->dev);
+	dsi->lanes = desc->lanes;
+	dsi->format = desc->format;
+	dsi->mode_flags = desc->mode_flags;
+	starry->desc = desc;
+	starry->dsi = dsi;
+	ret = starry_panel_add(starry);
+	if (ret < 0)
+		return ret;
+
+	mipi_dsi_set_drvdata(dsi, starry);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret)
+		drm_panel_remove(&starry->base);
+
+	return ret;
+}
+
+static void starry_panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct starry_panel *starry = 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);
+
+	if (starry->base.dev)
+		drm_panel_remove(&starry->base);
+}
+
+static const struct of_device_id starry_of_match[] = {
+	{ .compatible = "starry,er88577",
+	  .data = &starry_er88577_desc
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, starry_of_match);
+
+static struct mipi_dsi_driver starry_panel_driver = {
+	.driver = {
+		.name = "panel-starry-er88577",
+		.of_match_table = starry_of_match,
+	},
+	.probe = starry_panel_probe,
+	.remove = starry_panel_remove,
+};
+module_mipi_dsi_driver(starry_panel_driver);
+
+MODULE_AUTHOR("Zhaoxiong Lv <lvzhaoxiong@...qin.corp-partner.google.com>");
+MODULE_DESCRIPTION("starry er88577 800x1280 video mode panel driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1

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