Commit 3fa0e8f6 authored by David Lechner's avatar David Lechner
Browse files

drm/tinydrm: new driver for ILI9341 display panels 

This adds a new driver for display panels that use the Ilitek ILI9341
controller. It currently supports a single display panel, namely
the YX240QV29-T (e.g. Adafruit 2.4" TFT).

The init sequence is from the Adafruit Python library for the ILI9341
controller. https://github.com/adafruit/Adafruit_Python_ILI9341



Signed-off-by: default avatarDavid Lechner <david@lechnology.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180525193623.15533-5-david@lechnology.com
parent 7b59d2d8

MAINTAINERS

+6 −0
Original line number Diff line number Diff line
@@ -4478,6 +4478,12 @@ S: Maintained 
F:	drivers/gpu/drm/tinydrm/ili9225.c

F:	Documentation/devicetree/bindings/display/ilitek,ili9225.txt



DRM DRIVER FOR ILITEK ILI9341 PANELS

M:	David Lechner <david@lechnology.com>

S:	Maintained

F:	drivers/gpu/drm/tinydrm/ili9341.c

F:	Documentation/devicetree/bindings/display/ilitek,ili9341.txt



DRM DRIVER FOR INTEL I810 VIDEO CARDS

S:	Orphan / Obsolete

F:	drivers/gpu/drm/i810/

drivers/gpu/drm/tinydrm/Kconfig

+10 −0
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@@ -20,6 +20,16 @@ config TINYDRM_ILI9225 


	  If M is selected the module will be called ili9225.



config TINYDRM_ILI9341

	tristate "DRM support for ILI9341 display panels"

	depends on DRM_TINYDRM && SPI

	select TINYDRM_MIPI_DBI

	help

	  DRM driver for the following Ilitek ILI9341 panels:

	  * YX240QV29-T 2.4" 240x320 TFT (Adafruit 2.4")



	  If M is selected the module will be called ili9341.



config TINYDRM_MI0283QT

	tristate "DRM support for MI0283QT"

	depends on DRM_TINYDRM && SPI

drivers/gpu/drm/tinydrm/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ obj-$(CONFIG_TINYDRM_MIPI_DBI) += mipi-dbi.o 


# Displays

obj-$(CONFIG_TINYDRM_ILI9225)		+= ili9225.o

obj-$(CONFIG_TINYDRM_ILI9341)		+= ili9341.o

obj-$(CONFIG_TINYDRM_MI0283QT)		+= mi0283qt.o

obj-$(CONFIG_TINYDRM_REPAPER)		+= repaper.o

obj-$(CONFIG_TINYDRM_ST7586)		+= st7586.o

drivers/gpu/drm/tinydrm/ili9341.c

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// SPDX-License-Identifier: GPL-2.0+

/*

 * DRM driver for Ilitek ILI9341 panels

 *

 * Copyright 2018 David Lechner <david@lechnology.com>

 *

 * Based on mi0283qt.c:

 * Copyright 2016 Noralf Trønnes

 */



#include <linux/backlight.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/module.h>

#include <linux/property.h>

#include <linux/spi/spi.h>



#include <drm/drm_fb_helper.h>

#include <drm/drm_gem_framebuffer_helper.h>

#include <drm/drm_modeset_helper.h>

#include <drm/tinydrm/mipi-dbi.h>

#include <drm/tinydrm/tinydrm-helpers.h>

#include <video/mipi_display.h>



#define ILI9341_FRMCTR1		0xb1

#define ILI9341_DISCTRL		0xb6

#define ILI9341_ETMOD		0xb7



#define ILI9341_PWCTRL1		0xc0

#define ILI9341_PWCTRL2		0xc1

#define ILI9341_VMCTRL1		0xc5

#define ILI9341_VMCTRL2		0xc7

#define ILI9341_PWCTRLA		0xcb

#define ILI9341_PWCTRLB		0xcf



#define ILI9341_PGAMCTRL	0xe0

#define ILI9341_NGAMCTRL	0xe1

#define ILI9341_DTCTRLA		0xe8

#define ILI9341_DTCTRLB		0xea

#define ILI9341_PWRSEQ		0xed



#define ILI9341_EN3GAM		0xf2

#define ILI9341_PUMPCTRL	0xf7



#define ILI9341_MADCTL_BGR	BIT(3)

#define ILI9341_MADCTL_MV	BIT(5)

#define ILI9341_MADCTL_MX	BIT(6)

#define ILI9341_MADCTL_MY	BIT(7)



static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,

			     struct drm_crtc_state *crtc_state,

			     struct drm_plane_state *plane_state)

{

	struct tinydrm_device *tdev = pipe_to_tinydrm(pipe);

	struct mipi_dbi *mipi = mipi_dbi_from_tinydrm(tdev);

	u8 addr_mode;

	int ret;



	DRM_DEBUG_KMS("\n");



	ret = mipi_dbi_poweron_conditional_reset(mipi);

	if (ret < 0)

		return;

	if (ret == 1)

		goto out_enable;



	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_OFF);



	mipi_dbi_command(mipi, ILI9341_PWCTRLB, 0x00, 0xc1, 0x30);

	mipi_dbi_command(mipi, ILI9341_PWRSEQ, 0x64, 0x03, 0x12, 0x81);

	mipi_dbi_command(mipi, ILI9341_DTCTRLA, 0x85, 0x00, 0x78);

	mipi_dbi_command(mipi, ILI9341_PWCTRLA, 0x39, 0x2c, 0x00, 0x34, 0x02);

	mipi_dbi_command(mipi, ILI9341_PUMPCTRL, 0x20);

	mipi_dbi_command(mipi, ILI9341_DTCTRLB, 0x00, 0x00);



	/* Power Control */

	mipi_dbi_command(mipi, ILI9341_PWCTRL1, 0x23);

	mipi_dbi_command(mipi, ILI9341_PWCTRL2, 0x10);

	/* VCOM */

	mipi_dbi_command(mipi, ILI9341_VMCTRL1, 0x3e, 0x28);

	mipi_dbi_command(mipi, ILI9341_VMCTRL2, 0x86);



	/* Memory Access Control */

	mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);



	/* Frame Rate */

	mipi_dbi_command(mipi, ILI9341_FRMCTR1, 0x00, 0x1b);



	/* Gamma */

	mipi_dbi_command(mipi, ILI9341_EN3GAM, 0x00);

	mipi_dbi_command(mipi, MIPI_DCS_SET_GAMMA_CURVE, 0x01);

	mipi_dbi_command(mipi, ILI9341_PGAMCTRL,

			 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,

			 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);

	mipi_dbi_command(mipi, ILI9341_NGAMCTRL,

			 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,

			 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);



	/* DDRAM */

	mipi_dbi_command(mipi, ILI9341_ETMOD, 0x07);



	/* Display */

	mipi_dbi_command(mipi, ILI9341_DISCTRL, 0x08, 0x82, 0x27, 0x00);

	mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);

	msleep(100);



	mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);

	msleep(100);



out_enable:

	switch (mipi->rotation) {

	default:

		addr_mode = ILI9341_MADCTL_MX;

		break;

	case 90:

		addr_mode = ILI9341_MADCTL_MV;

		break;

	case 180:

		addr_mode = ILI9341_MADCTL_MY;

		break;

	case 270:

		addr_mode = ILI9341_MADCTL_MV | ILI9341_MADCTL_MY |

			    ILI9341_MADCTL_MX;

		break;

	}

	addr_mode |= ILI9341_MADCTL_BGR;

	mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);

	mipi_dbi_enable_flush(mipi, crtc_state, plane_state);

}



static const struct drm_simple_display_pipe_funcs ili9341_pipe_funcs = {

	.enable = yx240qv29_enable,

	.disable = mipi_dbi_pipe_disable,

	.update = tinydrm_display_pipe_update,

	.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,

};



static const struct drm_display_mode yx240qv29_mode = {

	TINYDRM_MODE(240, 320, 37, 49),

};



DEFINE_DRM_GEM_CMA_FOPS(ili9341_fops);



static struct drm_driver ili9341_driver = {

	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,

	.fops			= &ili9341_fops,

	TINYDRM_GEM_DRIVER_OPS,

	.lastclose		= drm_fb_helper_lastclose,

	.debugfs_init		= mipi_dbi_debugfs_init,

	.name			= "ili9341",

	.desc			= "Ilitek ILI9341",

	.date			= "20180514",

	.major			= 1,

	.minor			= 0,

};



static const struct of_device_id ili9341_of_match[] = {

	{ .compatible = "adafruit,yx240qv29" },

	{ }

};

MODULE_DEVICE_TABLE(of, ili9341_of_match);



static const struct spi_device_id ili9341_id[] = {

	{ "yx240qv29", 0 },

	{ }

};

MODULE_DEVICE_TABLE(spi, ili9341_id);



static int ili9341_probe(struct spi_device *spi)

{

	struct device *dev = &spi->dev;

	struct mipi_dbi *mipi;

	struct gpio_desc *dc;

	u32 rotation = 0;

	int ret;



	mipi = devm_kzalloc(dev, sizeof(*mipi), GFP_KERNEL);

	if (!mipi)

		return -ENOMEM;



	mipi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);

	if (IS_ERR(mipi->reset)) {

		DRM_DEV_ERROR(dev, "Failed to get gpio 'reset'\n");

		return PTR_ERR(mipi->reset);

	}



	dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW);

	if (IS_ERR(dc)) {

		DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");

		return PTR_ERR(dc);

	}



	mipi->backlight = devm_of_find_backlight(dev);

	if (IS_ERR(mipi->backlight))

		return PTR_ERR(mipi->backlight);



	device_property_read_u32(dev, "rotation", &rotation);



	ret = mipi_dbi_spi_init(spi, mipi, dc);

	if (ret)

		return ret;



	ret = mipi_dbi_init(&spi->dev, mipi, &ili9341_pipe_funcs,

			    &ili9341_driver, &yx240qv29_mode, rotation);

	if (ret)

		return ret;



	spi_set_drvdata(spi, mipi);



	return devm_tinydrm_register(&mipi->tinydrm);

}



static void ili9341_shutdown(struct spi_device *spi)

{

	struct mipi_dbi *mipi = spi_get_drvdata(spi);



	tinydrm_shutdown(&mipi->tinydrm);

}



static struct spi_driver ili9341_spi_driver = {

	.driver = {

		.name = "ili9341",

		.of_match_table = ili9341_of_match,

	},

	.id_table = ili9341_id,

	.probe = ili9341_probe,

	.shutdown = ili9341_shutdown,

};

module_spi_driver(ili9341_spi_driver);



MODULE_DESCRIPTION("Ilitek ILI9341 DRM driver");

MODULE_AUTHOR("David Lechner <david@lechnology.com>");

MODULE_LICENSE("GPL");

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