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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Date: Mon, 05 May 2025 11:16:29 +0200
Subject: [PATCH 2/2] drm/panel: Add Novatek NT37801 panel driver
Precedence: bulk
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Message-Id: <20250505-sm8750-display-panel-v1-2-e5b5398482cc@linaro.org>
References: <20250505-sm8750-display-panel-v1-0-e5b5398482cc@linaro.org>
In-Reply-To: <20250505-sm8750-display-panel-v1-0-e5b5398482cc@linaro.org>
To: Krzysztof Kozlowski <krzk@kernel.org>,
 Neil Armstrong <neil.armstrong@linaro.org>,
 Jessica Zhang <quic_jesszhan@quicinc.com>, David Airlie <airlied@gmail.com>,
 Simona Vetter <simona@ffwll.ch>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
 Rob Herring <robh@kernel.org>, Conor Dooley <conor+dt@kernel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
 dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
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X-Developer-Key: i=krzysztof.kozlowski@linaro.org; a=openpgp;
 fpr=9BD07E0E0C51F8D59677B7541B93437D3B41629B

Add driver for the Novatek NT37801 or NT37810 AMOLED DSI 1440x3200
panel in CMD mode, used on Qualcomm MTP8750 board (SM8750).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 MAINTAINERS                                   |   6 +
 drivers/gpu/drm/panel/Kconfig                 |  10 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-novatek-nt37801.c | 336 ++++++++++++++++++++++=
++++
 4 files changed, 353 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index b2c3be5f6131432647dd01f22bbf4bf1c8bde9e6..78cdd5f81c322c230a82c8a877b=
2338d932478cb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7595,6 +7595,12 @@ T:	git https://gitlab.freedesktop.org/drm/misc/kerne=
l.git
 F:	Documentation/devicetree/bindings/display/panel/novatek,nt36672a.yaml
 F:	drivers/gpu/drm/panel/panel-novatek-nt36672a.c
=20
+DRM DRIVER FOR NOVATEK NT37801 PANELS
+M:	Krzysztof Kozlowski <krzk@kernel.org>
+S:	Maintained
+F:	Documentation/devicetree/bindings/display/panel/novatek,nt37801.yaml
+F:	drivers/gpu/drm/panel/panel-novatek-nt37801.c
+
 DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS
 M:	Lyude Paul <lyude@redhat.com>
 M:	Danilo Krummrich <dakr@kernel.org>
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 7e9c60a626fbbabb954ed2a7e3d1ef5eee0679d6..c7b688995c8d31b7445aa79dcc3=
10742e4e724d8 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -508,6 +508,16 @@ config DRM_PANEL_NOVATEK_NT36672E
 	  LCD panel module. The panel has a resolution of 1080x2408 and uses 24 b=
it
 	  RGB per pixel.
=20
+config DRM_PANEL_NOVATEK_NT37801
+	tristate "Novatek NT37801/NT37810 AMOLED DSI 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 Novatek NT37801 (or
+	  NT37810) AMOLED DSI Video Mode LCD panel module with 1440x3200
+	  resolution.
+
 config DRM_PANEL_NOVATEK_NT39016
 	tristate "Novatek NT39016 RGB/SPI panel"
 	depends on OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 883974f0cba128e28f23e31512f8d30d59913b0e..2dcc224cba63e9cf59410fd974e=
5f068bb9e26b3 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35950) +=3D panel-novate=
k-nt35950.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36523) +=3D panel-novatek-nt36523.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672A) +=3D panel-novatek-nt36672a.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672E) +=3D panel-novatek-nt36672e.o
+obj-$(CONFIG_DRM_PANEL_NOVATEK_NT37801) +=3D panel-novatek-nt37801.o
 obj-$(CONFIG_DRM_PANEL_NOVATEK_NT39016) +=3D panel-novatek-nt39016.o
 obj-$(CONFIG_DRM_PANEL_MANTIX_MLAF057WE51) +=3D panel-mantix-mlaf057we51.o
 obj-$(CONFIG_DRM_PANEL_OLIMEX_LCD_OLINUXINO) +=3D panel-olimex-lcd-olinuxi=
no.o
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt37801.c b/drivers/gpu/dr=
m/panel/panel-novatek-nt37801.c
new file mode 100644
index 0000000000000000000000000000000000000000..2c07a61c3a58819ca4c5e39ae35=
2eac1b1fc694c
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-novatek-nt37801.c
@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2024 Linaro Limited
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+
+#include <drm/display/drm_dsc.h>
+#include <drm/display/drm_dsc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+
+#include <video/mipi_display.h>
+
+struct novatek_nt37801 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct drm_dsc_config dsc;
+	struct gpio_desc *reset_gpio;
+	struct regulator_bulk_data *supplies;
+};
+
+static const struct regulator_bulk_data novatek_nt37801_supplies[] =3D {
+	{ .supply =3D "vddio" },
+	{ .supply =3D "vci" },
+	{ .supply =3D "vdd" },
+};
+
+static inline struct novatek_nt37801 *to_novatek_nt37801(struct drm_panel =
*panel)
+{
+	return container_of(panel, struct novatek_nt37801, panel);
+}
+
+static void novatek_nt37801_reset(struct novatek_nt37801 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 21000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 21000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(10000, 21000);
+}
+
+static int novatek_nt37801_on(struct novatek_nt37801 *ctx)
+{
+	struct mipi_dsi_device *dsi =3D ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx =3D { .dsi =3D dsi };
+
+	dsi->mode_flags |=3D MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0,
+				     0x55, 0xaa, 0x52, 0x08, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xc5, 0x0b, 0x0b, 0x0b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x80);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x02);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf5, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x1b);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf4, 0x55);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x18);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf8, 0x19);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x0f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfc, 0x00);
+	mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0x0000, 0x059f);
+	mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 0x0c7f);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x90, 0x03, 0x03);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x91,
+				     0x89, 0x28, 0x00, 0x28, 0xc2, 0x00, 0x02,
+				     0x68, 0x04, 0x6c, 0x00, 0x0a, 0x02, 0x77,
+				     0x01, 0xe9, 0x10, 0xf0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xff, 0xaa, 0x55, 0xa5, 0x81);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x23);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xfb,
+				     0x00, 0x01, 0x00, 0x11, 0x33, 0x33, 0x33,
+				     0x55, 0x57, 0xd0, 0x00, 0x00, 0x44, 0x56,
+				     0x77, 0x78, 0x9a, 0xbc, 0xdd, 0xf0);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x6f, 0x06);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf3, 0xdc);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_SET_GAMMA_CURVE, 0x00);
+	mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x3b, 0x00, 0x18, 0x00, 0x10);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY,
+				     0x20);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x51,
+				     0x07, 0xff, 0x07, 0xff, 0x0f, 0xff);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5a, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x5f, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x9c, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_MEMORY_START);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0x2f, 0x00);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf0,
+				     0x55, 0xaa, 0x52, 0x08, 0x01);
+	mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xb2, 0x55, 0x01, 0xff, 0x03);
+	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 int novatek_nt37801_off(struct novatek_nt37801 *ctx)
+{
+	struct mipi_dsi_device *dsi =3D ctx->dsi;
+	struct mipi_dsi_multi_context dsi_ctx =3D { .dsi =3D dsi };
+
+	dsi->mode_flags &=3D ~MIPI_DSI_MODE_LPM;
+
+	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 20);
+
+	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
+	mipi_dsi_msleep(&dsi_ctx, 120);
+
+	return dsi_ctx.accum_err;
+}
+
+static int novatek_nt37801_prepare(struct drm_panel *panel)
+{
+	struct novatek_nt37801 *ctx =3D to_novatek_nt37801(panel);
+	struct device *dev =3D &ctx->dsi->dev;
+	struct drm_dsc_picture_parameter_set pps;
+	int ret;
+
+	ret =3D regulator_bulk_enable(ARRAY_SIZE(novatek_nt37801_supplies),
+				    ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	novatek_nt37801_reset(ctx);
+
+	ret =3D novatek_nt37801_on(ctx);
+	if (ret < 0)
+		goto err;
+
+	drm_dsc_pps_payload_pack(&pps, &ctx->dsc);
+
+	ret =3D mipi_dsi_picture_parameter_set(ctx->dsi, &pps);
+	if (ret < 0) {
+		dev_err(panel->dev, "failed to transmit PPS: %d\n", ret);
+		goto err;
+	}
+
+	ret =3D mipi_dsi_compression_mode(ctx->dsi, true);
+	if (ret < 0) {
+		dev_err(dev, "failed to enable compression mode: %d\n", ret);
+		goto err;
+	}
+
+	msleep(28);
+
+	return 0;
+
+err:
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	regulator_bulk_disable(ARRAY_SIZE(novatek_nt37801_supplies),
+			       ctx->supplies);
+
+	return ret;
+}
+
+static int novatek_nt37801_unprepare(struct drm_panel *panel)
+{
+	struct novatek_nt37801 *ctx =3D to_novatek_nt37801(panel);
+	struct device *dev =3D &ctx->dsi->dev;
+	int ret;
+
+	ret =3D novatek_nt37801_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+
+	regulator_bulk_disable(ARRAY_SIZE(novatek_nt37801_supplies),
+			       ctx->supplies);
+
+	return 0;
+}
+
+static const struct drm_display_mode novatek_nt37801_mode =3D {
+	.clock =3D (1440 + 20 + 4 + 20) * (3200 + 20 + 2 + 18) * 120 / 1000,
+	.hdisplay =3D 1440,
+	.hsync_start =3D 1440 + 20,
+	.hsync_end =3D 1440 + 20 + 4,
+	.htotal =3D 1440 + 20 + 4 + 20,
+	.vdisplay =3D 3200,
+	.vsync_start =3D 3200 + 20,
+	.vsync_end =3D 3200 + 20 + 2,
+	.vtotal =3D 3200 + 20 + 2 + 18,
+	.type =3D DRM_MODE_TYPE_DRIVER,
+};
+
+static int novatek_nt37801_get_modes(struct drm_panel *panel,
+				     struct drm_connector *connector)
+{
+	return drm_connector_helper_get_modes_fixed(connector,
+						    &novatek_nt37801_mode);
+}
+
+static const struct drm_panel_funcs novatek_nt37801_panel_funcs =3D {
+	.prepare =3D novatek_nt37801_prepare,
+	.unprepare =3D novatek_nt37801_unprepare,
+	.get_modes =3D novatek_nt37801_get_modes,
+};
+
+static int novatek_nt37801_bl_update_status(struct backlight_device *bl)
+{
+	struct mipi_dsi_device *dsi =3D bl_get_data(bl);
+	u16 brightness =3D backlight_get_brightness(bl);
+	int ret;
+
+	dsi->mode_flags &=3D ~MIPI_DSI_MODE_LPM;
+
+	ret =3D mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+	if (ret < 0)
+		return ret;
+
+	dsi->mode_flags |=3D MIPI_DSI_MODE_LPM;
+
+	return 0;
+}
+
+static const struct backlight_ops novatek_nt37801_bl_ops =3D {
+	.update_status =3D novatek_nt37801_bl_update_status,
+};
+
+static struct backlight_device *
+novatek_nt37801_create_backlight(struct mipi_dsi_device *dsi)
+{
+	struct device *dev =3D &dsi->dev;
+	const struct backlight_properties props =3D {
+		.type =3D BACKLIGHT_RAW,
+		.brightness =3D 4095,
+		.max_brightness =3D 4095,
+	};
+
+	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
+					      &novatek_nt37801_bl_ops, &props);
+}
+
+static int novatek_nt37801_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev =3D &dsi->dev;
+	struct novatek_nt37801 *ctx;
+	int ret;
+
+	ctx =3D devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ret =3D devm_regulator_bulk_get_const(dev,
+					    ARRAY_SIZE(novatek_nt37801_supplies),
+					    novatek_nt37801_supplies,
+					    &ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	ctx->reset_gpio =3D devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset_gpio))
+		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
+				     "Failed to get reset-gpios\n");
+
+	ctx->dsi =3D dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes =3D 4;
+	dsi->format =3D MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags =3D MIPI_DSI_MODE_NO_EOT_PACKET | MIPI_DSI_CLOCK_NON_CONT=
INUOUS;
+
+	drm_panel_init(&ctx->panel, dev, &novatek_nt37801_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+	ctx->panel.prepare_prev_first =3D true;
+
+	ctx->panel.backlight =3D novatek_nt37801_create_backlight(dsi);
+	if (IS_ERR(ctx->panel.backlight))
+		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
+				     "Failed to create backlight\n");
+
+	drm_panel_add(&ctx->panel);
+
+	/* This panel only supports DSC; unconditionally enable it */
+	dsi->dsc =3D &ctx->dsc;
+	ctx->dsc.dsc_version_major =3D 1;
+	ctx->dsc.dsc_version_minor =3D 1;
+	ctx->dsc.slice_height =3D 40;
+	ctx->dsc.slice_width =3D 720;
+	ctx->dsc.slice_count =3D 1440 / ctx->dsc.slice_width;
+	ctx->dsc.bits_per_component =3D 8;
+	ctx->dsc.bits_per_pixel =3D 8 << 4; /* 4 fractional bits */
+	ctx->dsc.block_pred_enable =3D true;
+
+	ret =3D mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_panel_remove(&ctx->panel);
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
+	}
+
+	return 0;
+}
+
+static void novatek_nt37801_remove(struct mipi_dsi_device *dsi)
+{
+	struct novatek_nt37801 *ctx =3D mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret =3D mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_remove(&ctx->panel);
+}
+
+static const struct of_device_id novatek_nt37801_of_match[] =3D {
+	{ .compatible =3D "novatek,nt37801" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, novatek_nt37801_of_match);
+
+static struct mipi_dsi_driver novatek_nt37801_driver =3D {
+	.probe =3D novatek_nt37801_probe,
+	.remove =3D novatek_nt37801_remove,
+	.driver =3D {
+		.name =3D "panel-novatek-nt37801",
+		.of_match_table =3D novatek_nt37801_of_match,
+	},
+};
+module_mipi_dsi_driver(novatek_nt37801_driver);
+
+MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>");
+MODULE_DESCRIPTION("Panel driver for the Novatek NT37801/NT37810 AMOLED DS=
I panel");
+MODULE_LICENSE("GPL");

--=20
2.45.2