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From: Carlis <zhangxuezhi3@gmail.com>
To: airlied@linux.ie, daniel@ffwll.ch, zhangxuezhi1@yulong.com,
 robh+dt@kernel.org
Subject: [PATCH v4 1/2] drm/tiny: add support for Waveshare 2inch LCD module
Date: Wed, 31 Mar 2021 03:05:49 +0000
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From: Xuezhi Zhang <zhangxuezhi1@yulong.com>

This adds a new module for the ST7789V controller with parameters for
the Waveshare 2inch LCD module.

Signed-off-by: Xuezhi Zhang <zhangxuezhi1@yulong.com>
---
v2:change compatible value.
v3:change author name.
v4:delete a maintainer.
---
 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 d92f85ca831d..9f8b3d6cdeac 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:	Xuezhi Zhang <zhangxuezhi1@yulong.com>
+S:	Maintained
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	Documentation/devicetree/bindings/display/sitronix,st7789v-dbi.yaml
+F:	drivers/gpu/drm/tiny/st7789v.c
+
 DRM DRIVER FOR SONY ACX424AKP PANELS
 M:	Linus Walleij <linus.walleij@linaro.org>
 S:	Maintained
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 2b6414f0fa75..ac2c7fb702f0 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 6ae4e9e5a35f..aa0caa2b6c16 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 000000000000..9b4bb9edba40
--- /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@lechnology.com>
+ * 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,ws2inch", .data = &ws_2inch_lcd_cfg },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, st7789v_of_match);
+
+static const struct spi_device_id st7789v_id[] = {
+	{ "ws2inch", (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-dbi",
+		.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@yulong.com>");
+MODULE_LICENSE("GPL");