[PATCH 2/2] drm/panel: Add Novatek NT37801 panel driver
Krzysztof Kozlowski
krzysztof.kozlowski at linaro.org
Mon May 5 09:16:29 UTC 2025
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 at 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..78cdd5f81c322c230a82c8a877b2338d932478cb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7595,6 +7595,12 @@ T: git https://gitlab.freedesktop.org/drm/misc/kernel.git
F: Documentation/devicetree/bindings/display/panel/novatek,nt36672a.yaml
F: drivers/gpu/drm/panel/panel-novatek-nt36672a.c
+DRM DRIVER FOR NOVATEK NT37801 PANELS
+M: Krzysztof Kozlowski <krzk at 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 at redhat.com>
M: Danilo Krummrich <dakr at kernel.org>
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 7e9c60a626fbbabb954ed2a7e3d1ef5eee0679d6..c7b688995c8d31b7445aa79dcc310742e4e724d8 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 bit
RGB per pixel.
+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..2dcc224cba63e9cf59410fd974e5f068bb9e26b3 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_DRM_PANEL_NOVATEK_NT35950) += panel-novatek-nt35950.o
obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36523) += panel-novatek-nt36523.o
obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672A) += panel-novatek-nt36672a.o
obj-$(CONFIG_DRM_PANEL_NOVATEK_NT36672E) += panel-novatek-nt36672e.o
+obj-$(CONFIG_DRM_PANEL_NOVATEK_NT37801) += panel-novatek-nt37801.o
obj-$(CONFIG_DRM_PANEL_NOVATEK_NT39016) += panel-novatek-nt39016.o
obj-$(CONFIG_DRM_PANEL_MANTIX_MLAF057WE51) += panel-mantix-mlaf057we51.o
obj-$(CONFIG_DRM_PANEL_OLIMEX_LCD_OLINUXINO) += panel-olimex-lcd-olinuxino.o
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt37801.c b/drivers/gpu/drm/panel/panel-novatek-nt37801.c
new file mode 100644
index 0000000000000000000000000000000000000000..2c07a61c3a58819ca4c5e39ae352eac1b1fc694c
--- /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[] = {
+ { .supply = "vddio" },
+ { .supply = "vci" },
+ { .supply = "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 = ctx->dsi;
+ struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+
+ dsi->mode_flags |= 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 = ctx->dsi;
+ struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
+
+ dsi->mode_flags &= ~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 = to_novatek_nt37801(panel);
+ struct device *dev = &ctx->dsi->dev;
+ struct drm_dsc_picture_parameter_set pps;
+ int ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(novatek_nt37801_supplies),
+ ctx->supplies);
+ if (ret < 0)
+ return ret;
+
+ novatek_nt37801_reset(ctx);
+
+ ret = novatek_nt37801_on(ctx);
+ if (ret < 0)
+ goto err;
+
+ drm_dsc_pps_payload_pack(&pps, &ctx->dsc);
+
+ ret = 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 = 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 = to_novatek_nt37801(panel);
+ struct device *dev = &ctx->dsi->dev;
+ int ret;
+
+ ret = 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 = {
+ .clock = (1440 + 20 + 4 + 20) * (3200 + 20 + 2 + 18) * 120 / 1000,
+ .hdisplay = 1440,
+ .hsync_start = 1440 + 20,
+ .hsync_end = 1440 + 20 + 4,
+ .htotal = 1440 + 20 + 4 + 20,
+ .vdisplay = 3200,
+ .vsync_start = 3200 + 20,
+ .vsync_end = 3200 + 20 + 2,
+ .vtotal = 3200 + 20 + 2 + 18,
+ .type = 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 = {
+ .prepare = novatek_nt37801_prepare,
+ .unprepare = novatek_nt37801_unprepare,
+ .get_modes = novatek_nt37801_get_modes,
+};
+
+static int novatek_nt37801_bl_update_status(struct backlight_device *bl)
+{
+ struct mipi_dsi_device *dsi = bl_get_data(bl);
+ u16 brightness = backlight_get_brightness(bl);
+ int ret;
+
+ dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+ ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
+ if (ret < 0)
+ return ret;
+
+ dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+ return 0;
+}
+
+static const struct backlight_ops novatek_nt37801_bl_ops = {
+ .update_status = novatek_nt37801_bl_update_status,
+};
+
+static struct backlight_device *
+novatek_nt37801_create_backlight(struct mipi_dsi_device *dsi)
+{
+ struct device *dev = &dsi->dev;
+ const struct backlight_properties props = {
+ .type = BACKLIGHT_RAW,
+ .brightness = 4095,
+ .max_brightness = 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 = &dsi->dev;
+ struct novatek_nt37801 *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ret = devm_regulator_bulk_get_const(dev,
+ ARRAY_SIZE(novatek_nt37801_supplies),
+ novatek_nt37801_supplies,
+ &ctx->supplies);
+ if (ret < 0)
+ return ret;
+
+ ctx->reset_gpio = 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 = dsi;
+ mipi_dsi_set_drvdata(dsi, ctx);
+
+ dsi->lanes = 4;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_NO_EOT_PACKET | MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+ drm_panel_init(&ctx->panel, dev, &novatek_nt37801_panel_funcs,
+ DRM_MODE_CONNECTOR_DSI);
+ ctx->panel.prepare_prev_first = true;
+
+ ctx->panel.backlight = 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 = &ctx->dsc;
+ ctx->dsc.dsc_version_major = 1;
+ ctx->dsc.dsc_version_minor = 1;
+ ctx->dsc.slice_height = 40;
+ ctx->dsc.slice_width = 720;
+ ctx->dsc.slice_count = 1440 / ctx->dsc.slice_width;
+ ctx->dsc.bits_per_component = 8;
+ ctx->dsc.bits_per_pixel = 8 << 4; /* 4 fractional bits */
+ ctx->dsc.block_pred_enable = true;
+
+ ret = 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 = 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(&ctx->panel);
+}
+
+static const struct of_device_id novatek_nt37801_of_match[] = {
+ { .compatible = "novatek,nt37801" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, novatek_nt37801_of_match);
+
+static struct mipi_dsi_driver novatek_nt37801_driver = {
+ .probe = novatek_nt37801_probe,
+ .remove = novatek_nt37801_remove,
+ .driver = {
+ .name = "panel-novatek-nt37801",
+ .of_match_table = novatek_nt37801_of_match,
+ },
+};
+module_mipi_dsi_driver(novatek_nt37801_driver);
+
+MODULE_AUTHOR("Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>");
+MODULE_DESCRIPTION("Panel driver for the Novatek NT37801/NT37810 AMOLED DSI panel");
+MODULE_LICENSE("GPL");
--
2.45.2
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