[PATCH] drm/tiny: add support for Waveshare 2inch LCD module
From: Carlis
Date: Wed Mar 10 2021 - 09:06:57 EST
From: "Carlis" <zhangxuezhi1@xxxxxxxxxx>
This adds a new module for the ST7789V controller with parameters for
the Waveshare 2inch LCD module.
Signed-off-by: Carlis <zhangxuezhi1@xxxxxxxxxx>
---
MAINTAINERS | 7 ++
drivers/gpu/drm/tiny/Kconfig | 14 +++
drivers/gpu/drm/tiny/Makefile | 1 +
drivers/gpu/drm/tiny/st7789v.c | 269 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 291 insertions(+)
create mode 100644 drivers/gpu/drm/tiny/st7789v.c
diff --git a/MAINTAINERS b/MAINTAINERS
index d92f85c..10161be 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5769,6 +5769,13 @@ T: git git://anongit.freedesktop.org/drm/drm-misc
F: Documentation/devicetree/bindings/display/sitronix,st7735r.yaml
F: drivers/gpu/drm/tiny/st7735r.c
+DRM DRIVER FOR SITRONIX ST7789V PANELS
+M: Carlis <zhangxuezhi1@xxxxxxxxxx>
+S: Maintained
+T: git git://anongit.freedesktop.org/drm/drm-misc
+F: Documentation/devicetree/bindings/display/sitronix,st7789v.yaml
+F: drivers/gpu/drm/tiny/st7789v.c
+
DRM DRIVER FOR SONY ACX424AKP PANELS
M: Linus Walleij <linus.walleij@xxxxxxxxxx>
S: Maintained
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 2b6414f..ac2c7fb 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -131,3 +131,17 @@ config TINYDRM_ST7735R
* Okaya RH128128T 1.44" 128x128 TFT
If M is selected the module will be called st7735r.
+
+config TINYDRM_ST7789V
+ tristate "DRM support for Sitronix ST7789V display panels"
+ depends on DRM && SPI
+ select DRM_KMS_HELPER
+ select DRM_KMS_CMA_HELPER
+ select DRM_MIPI_DBI
+ select BACKLIGHT_CLASS_DEVICE
+ help
+ DRM driver for Sitronix ST7789V with one of the following
+ LCDs:
+ * Waveshare 2inch lcd module 240x320 TFT
+
+ If M is selected the module will be called st7789v.
diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
index 6ae4e9e5..aa0caa2 100644
--- a/drivers/gpu/drm/tiny/Makefile
+++ b/drivers/gpu/drm/tiny/Makefile
@@ -10,3 +10,4 @@ obj-$(CONFIG_TINYDRM_MI0283QT) += mi0283qt.o
obj-$(CONFIG_TINYDRM_REPAPER) += repaper.o
obj-$(CONFIG_TINYDRM_ST7586) += st7586.o
obj-$(CONFIG_TINYDRM_ST7735R) += st7735r.o
+obj-$(CONFIG_TINYDRM_ST7789V) += st7789v.o
diff --git a/drivers/gpu/drm/tiny/st7789v.c b/drivers/gpu/drm/tiny/st7789v.c
new file mode 100644
index 0000000..b641857
--- /dev/null
+++ b/drivers/gpu/drm/tiny/st7789v.c
@@ -0,0 +1,269 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * DRM driver for display panels connected to a Sitronix ST7789V
+ * display controller in SPI mode.
+ *
+ * Copyright 2017 David Lechner <david@xxxxxxxxxxxxxx>
+ * Copyright (C) 2019 Glider bvba
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/dma-buf.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/spi/spi.h>
+#include <video/mipi_display.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_mipi_dbi.h>
+
+#define ST7789V_PORCTRL 0xb2
+#define ST7789V_GCTRL 0xb7
+#define ST7789V_VCOMS 0xbb
+#define ST7789V_LCMCTRL 0xc0
+#define ST7789V_VDVVRHEN 0xc2
+#define ST7789V_VRHS 0xc3
+#define ST7789V_VDVS 0xc4
+#define ST7789V_FRCTRL2 0xc6
+#define ST7789V_PWCTRL1 0xd0
+#define ST7789V_PVGAMCTRL 0xe0
+#define ST7789V_NVGAMCTRL 0xe1
+
+#define ST7789V_MY BIT(7)
+#define ST7789V_MX BIT(6)
+#define ST7789V_MV BIT(5)
+#define ST7789V_RGB BIT(3)
+
+struct st7789v_cfg {
+ const struct drm_display_mode mode;
+ unsigned int left_offset;
+ unsigned int top_offset;
+ unsigned int write_only:1;
+ unsigned int rgb:1; /* RGB (vs. BGR) */
+};
+
+struct st7789v_priv {
+ struct mipi_dbi_dev dbidev; /* Must be first for .release() */
+ const struct st7789v_cfg *cfg;
+};
+
+static void st7789v_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state)
+{
+ struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev);
+ struct st7789v_priv *priv = container_of(dbidev, struct st7789v_priv,
+ dbidev);
+ struct mipi_dbi *dbi = &dbidev->dbi;
+ int ret, idx;
+ u8 addr_mode;
+
+ if (!drm_dev_enter(pipe->crtc.dev, &idx))
+ return;
+
+ DRM_DEBUG_KMS("\n");
+
+ ret = mipi_dbi_poweron_reset(dbidev);
+ if (ret)
+ goto out_exit;
+
+ msleep(150);
+
+ mipi_dbi_command(dbi, MIPI_DCS_EXIT_SLEEP_MODE);
+ msleep(100);
+
+
+ switch (dbidev->rotation) {
+ default:
+ addr_mode = 0;
+ break;
+ case 90:
+ addr_mode = ST7789V_MY | ST7789V_MV;
+ break;
+ case 180:
+ addr_mode = ST7789V_MX | ST7789V_MY;
+ break;
+ case 270:
+ addr_mode = ST7789V_MX | ST7789V_MV;
+ break;
+ }
+
+ if (priv->cfg->rgb)
+ addr_mode |= ST7789V_RGB;
+
+ mipi_dbi_command(dbi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
+ mipi_dbi_command(dbi, MIPI_DCS_SET_PIXEL_FORMAT,
+ MIPI_DCS_PIXEL_FMT_16BIT);
+ mipi_dbi_command(dbi, MIPI_DCS_ENTER_INVERT_MODE);
+ mipi_dbi_command(dbi, ST7789V_PORCTRL, 0x0c, 0x0c, 0x00, 0x33, 0x33);
+ mipi_dbi_command(dbi, ST7789V_GCTRL, 0x35);
+ mipi_dbi_command(dbi, ST7789V_VCOMS, 0x1f);
+ mipi_dbi_command(dbi, ST7789V_LCMCTRL, 0x2c);
+ mipi_dbi_command(dbi, ST7789V_VDVVRHEN, 0x01);
+ mipi_dbi_command(dbi, ST7789V_VRHS, 0x12);
+ mipi_dbi_command(dbi, ST7789V_VDVS, 0x20);
+ mipi_dbi_command(dbi, ST7789V_FRCTRL2, 0x0f);
+ mipi_dbi_command(dbi, ST7789V_PWCTRL1, 0xa4, 0xa1);
+ mipi_dbi_command(dbi, ST7789V_PVGAMCTRL, 0xd0, 0x08, 0x11, 0x08, 0x0c,
+ 0x15, 0x39, 0x33, 0x50, 0x36, 0x13, 0x14, 0x29, 0x2d);
+ mipi_dbi_command(dbi, ST7789V_NVGAMCTRL, 0xd0, 0x08, 0x10, 0x08, 0x06,
+ 0x06, 0x39, 0x44, 0x51, 0x0b, 0x16, 0x14, 0x2f, 0x31);
+ mipi_dbi_command(dbi, MIPI_DCS_SET_DISPLAY_ON);
+ msleep(100);
+ mipi_dbi_enable_flush(dbidev, crtc_state, plane_state);
+
+out_exit:
+ drm_dev_exit(idx);
+}
+
+static const struct drm_simple_display_pipe_funcs st7789v_pipe_funcs = {
+ .enable = st7789v_pipe_enable,
+ .disable = mipi_dbi_pipe_disable,
+ .update = mipi_dbi_pipe_update,
+ .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
+};
+
+static const struct st7789v_cfg ws_2inch_lcd_cfg = {
+ .mode = { DRM_SIMPLE_MODE(240, 320, 34, 43) },
+ /* Cannot read from Waveshare 2inch lcd module" display via SPI */
+ .write_only = true,
+ .rgb = false,
+};
+
+
+DEFINE_DRM_GEM_CMA_FOPS(st7789v_fops);
+
+static const struct drm_driver st7789v_driver = {
+ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+ .fops = &st7789v_fops,
+ DRM_GEM_CMA_DRIVER_OPS_VMAP,
+ .debugfs_init = mipi_dbi_debugfs_init,
+ .name = "st7789v",
+ .desc = "Sitronix ST7789R",
+ .date = "20210310",
+ .major = 1,
+ .minor = 0,
+};
+
+static const struct of_device_id st7789v_of_match[] = {
+ { .compatible = "waveshare,ws-2inch-lcd", .data = &ws_2inch_lcd_cfg },
+ { },
+};
+MODULE_DEVICE_TABLE(of, st7789v_of_match);
+
+static const struct spi_device_id st7789v_id[] = {
+ { "ws-2inch-lcd", (uintptr_t)&ws_2inch_lcd_cfg },
+ { },
+};
+MODULE_DEVICE_TABLE(spi, st7789v_id);
+
+static int st7789v_probe(struct spi_device *spi)
+{
+ struct device *dev = &spi->dev;
+ const struct st7789v_cfg *cfg;
+ struct mipi_dbi_dev *dbidev;
+ struct st7789v_priv *priv;
+ struct drm_device *drm;
+ struct mipi_dbi *dbi;
+ struct gpio_desc *dc;
+ u32 rotation = 0;
+ int ret;
+
+ cfg = device_get_match_data(&spi->dev);
+ if (!cfg)
+ cfg = (void *)spi_get_device_id(spi)->driver_data;
+
+ priv = devm_drm_dev_alloc(dev, &st7789v_driver,
+ struct st7789v_priv, dbidev.drm);
+ if (IS_ERR(priv))
+ return PTR_ERR(priv);
+
+ dbidev = &priv->dbidev;
+ priv->cfg = cfg;
+
+ dbi = &dbidev->dbi;
+ drm = &dbidev->drm;
+
+ dbi->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(dbi->reset)) {
+ DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");
+ return PTR_ERR(dbi->reset);
+ }
+
+ dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
+ if (IS_ERR(dc)) {
+ DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
+ return PTR_ERR(dc);
+ }
+
+ dbidev->backlight = devm_of_find_backlight(dev);
+ if (IS_ERR(dbidev->backlight))
+ return PTR_ERR(dbidev->backlight);
+
+ device_property_read_u32(dev, "rotation", &rotation);
+
+ ret = mipi_dbi_spi_init(spi, dbi, dc);
+ if (ret)
+ return ret;
+
+ if (cfg->write_only)
+ dbi->read_commands = NULL;
+
+ dbidev->left_offset = cfg->left_offset;
+ dbidev->top_offset = cfg->top_offset;
+
+ ret = mipi_dbi_dev_init(dbidev, &st7789v_pipe_funcs, &cfg->mode,
+ rotation);
+ if (ret)
+ return ret;
+
+ drm_mode_config_reset(drm);
+
+ ret = drm_dev_register(drm, 0);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, drm);
+
+ drm_fbdev_generic_setup(drm, 0);
+
+ return 0;
+}
+
+static int st7789v_remove(struct spi_device *spi)
+{
+ struct drm_device *drm = spi_get_drvdata(spi);
+
+ drm_dev_unplug(drm);
+ drm_atomic_helper_shutdown(drm);
+
+ return 0;
+}
+
+static void st7789v_shutdown(struct spi_device *spi)
+{
+ drm_atomic_helper_shutdown(spi_get_drvdata(spi));
+}
+
+static struct spi_driver st7789v_spi_driver = {
+ .driver = {
+ .name = "st7789v",
+ .of_match_table = st7789v_of_match,
+ },
+ .id_table = st7789v_id,
+ .probe = st7789v_probe,
+ .remove = st7789v_remove,
+ .shutdown = st7789v_shutdown,
+};
+module_spi_driver(st7789v_spi_driver);
+
+MODULE_DESCRIPTION("Sitronix ST7789V DRM driver");
+MODULE_AUTHOR("Carlis <zhangxuezhi1@xxxxxxxxxx>");
+MODULE_LICENSE("GPL");
--
1.9.1