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Commit 58c467ec authored by Heiko Schocher's avatar Heiko Schocher Committed by Thierry Reding
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drm/panel: Add support for LG LG4573 480x800 4.3" panel 



The LG4573 is used on the LG LCD LB043WV2-SD01, an industrial 4.3" TFT
panel with SPI control interface.

Signed-off-by: default avatarHeiko Schocher <hs@denx.de>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent a99fb626

Documentation/devicetree/bindings/panel/lg,lg4573.txt

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LG LG4573 TFT Liquid Crystal Display with SPI control bus



Required properties:

  - compatible: "lg,lg4573"

  - reg: address of the panel on the SPI bus



The panel must obey rules for SPI slave device specified in document [1].



[1]: Documentation/devicetree/bindings/spi/spi-bus.txt



Example:



	lcd_panel: display@0 {

		#address-cells = <1>;

		#size-cells = <1>;

		compatible = "lg,lg4573";

		spi-max-frequency = <10000000>;

		reg = <0>;

	};

drivers/gpu/drm/panel/Kconfig

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@@ -23,6 +23,14 @@ config DRM_PANEL_SAMSUNG_LD9040 
	depends on OF && SPI

	select VIDEOMODE_HELPERS



config DRM_PANEL_LG_LG4573

	tristate "LG4573 RGB/SPI panel"

	depends on OF && SPI

	select VIDEOMODE_HELPERS

	help

	  Say Y here if you want to enable support for LG4573 RGB panel.

	  To compile this driver as a module, choose M here.



config DRM_PANEL_SAMSUNG_S6E8AA0

	tristate "Samsung S6E8AA0 DSI video mode panel"

	depends on OF

drivers/gpu/drm/panel/Makefile

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obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o

obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o

obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o

obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o

obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o

drivers/gpu/drm/panel/panel-lg-lg4573.c

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/*

 * Copyright (C) 2015 Heiko Schocher <hs@denx.de>

 *

 * from:

 * drivers/gpu/drm/panel/panel-ld9040.c

 * ld9040 AMOLED LCD drm_panel driver.

 *

 * Copyright (c) 2014 Samsung Electronics Co., Ltd

 * Derived from drivers/video/backlight/ld9040.c

 *

 * Andrzej Hajda <a.hajda@samsung.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

*/



#include <drm/drmP.h>

#include <drm/drm_panel.h>



#include <linux/gpio/consumer.h>

#include <linux/regulator/consumer.h>

#include <linux/spi/spi.h>



#include <video/mipi_display.h>

#include <video/of_videomode.h>

#include <video/videomode.h>



struct lg4573 {

	struct drm_panel panel;

	struct spi_device *spi;

	struct videomode vm;

};



static inline struct lg4573 *panel_to_lg4573(struct drm_panel *panel)

{

	return container_of(panel, struct lg4573, panel);

}



static int lg4573_spi_write_u16(struct lg4573 *ctx, u16 data)

{

	struct spi_transfer xfer = {

		.len = 2,

	};

	u16 temp = cpu_to_be16(data);

	struct spi_message msg;



	dev_dbg(ctx->panel.dev, "writing data: %x\n", data);

	xfer.tx_buf = &temp;

	spi_message_init(&msg);

	spi_message_add_tail(&xfer, &msg);



	return spi_sync(ctx->spi, &msg);

}



static int lg4573_spi_write_u16_array(struct lg4573 *ctx, const u16 *buffer,

				      unsigned int count)

{

	unsigned int i;

	int ret;



	for (i = 0; i < count; i++) {

		ret = lg4573_spi_write_u16(ctx, buffer[i]);

		if (ret)

			return ret;

	}



	return 0;

}



static int lg4573_spi_write_dcs(struct lg4573 *ctx, u8 dcs)

{

	return lg4573_spi_write_u16(ctx, (0x70 << 8 | dcs));

}



static int lg4573_display_on(struct lg4573 *ctx)

{

	int ret;



	ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_EXIT_SLEEP_MODE);

	if (ret)

		return ret;



	msleep(5);



	return lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_ON);

}



static int lg4573_display_off(struct lg4573 *ctx)

{

	int ret;



	ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_OFF);

	if (ret)

		return ret;



	msleep(120);



	return lg4573_spi_write_dcs(ctx, MIPI_DCS_ENTER_SLEEP_MODE);

}



static int lg4573_display_mode_settings(struct lg4573 *ctx)

{

	static const u16 display_mode_settings[] = {

		0x703A, 0x7270, 0x70B1, 0x7208,

		0x723B, 0x720F, 0x70B2, 0x7200,

		0x72C8, 0x70B3, 0x7200, 0x70B4,

		0x7200, 0x70B5, 0x7242, 0x7210,

		0x7210, 0x7200, 0x7220, 0x70B6,

		0x720B, 0x720F, 0x723C, 0x7213,

		0x7213, 0x72E8, 0x70B7, 0x7246,

		0x7206, 0x720C, 0x7200, 0x7200,

	};



	dev_dbg(ctx->panel.dev, "transfer display mode settings\n");

	return lg4573_spi_write_u16_array(ctx, display_mode_settings,

					  ARRAY_SIZE(display_mode_settings));

}



static int lg4573_power_settings(struct lg4573 *ctx)

{

	static const u16 power_settings[] = {

		0x70C0, 0x7201, 0x7211, 0x70C3,

		0x7207, 0x7203, 0x7204, 0x7204,

		0x7204, 0x70C4, 0x7212, 0x7224,

		0x7218, 0x7218, 0x7202, 0x7249,

		0x70C5, 0x726F, 0x70C6, 0x7241,

		0x7263,

	};



	dev_dbg(ctx->panel.dev, "transfer power settings\n");

	return lg4573_spi_write_u16_array(ctx, power_settings,

					  ARRAY_SIZE(power_settings));

}



static int lg4573_gamma_settings(struct lg4573 *ctx)

{

	static const u16 gamma_settings[] = {

		0x70D0, 0x7203, 0x7207, 0x7273,

		0x7235, 0x7200, 0x7201, 0x7220,

		0x7200, 0x7203, 0x70D1, 0x7203,

		0x7207, 0x7273, 0x7235, 0x7200,

		0x7201, 0x7220, 0x7200, 0x7203,

		0x70D2, 0x7203, 0x7207, 0x7273,

		0x7235, 0x7200, 0x7201, 0x7220,

		0x7200, 0x7203, 0x70D3, 0x7203,

		0x7207, 0x7273, 0x7235, 0x7200,

		0x7201, 0x7220, 0x7200, 0x7203,

		0x70D4, 0x7203, 0x7207, 0x7273,

		0x7235, 0x7200, 0x7201, 0x7220,

		0x7200, 0x7203, 0x70D5, 0x7203,

		0x7207, 0x7273, 0x7235, 0x7200,

		0x7201, 0x7220, 0x7200, 0x7203,

	};



	dev_dbg(ctx->panel.dev, "transfer gamma settings\n");

	return lg4573_spi_write_u16_array(ctx, gamma_settings,

					  ARRAY_SIZE(gamma_settings));

}



static int lg4573_init(struct lg4573 *ctx)

{

	int ret;



	dev_dbg(ctx->panel.dev, "initializing LCD\n");



	ret = lg4573_display_mode_settings(ctx);

	if (ret)

		return ret;



	ret = lg4573_power_settings(ctx);

	if (ret)

		return ret;



	return lg4573_gamma_settings(ctx);

}



static int lg4573_power_on(struct lg4573 *ctx)

{

	return lg4573_display_on(ctx);

}



static int lg4573_disable(struct drm_panel *panel)

{

	struct lg4573 *ctx = panel_to_lg4573(panel);



	return lg4573_display_off(ctx);

}



static int lg4573_enable(struct drm_panel *panel)

{

	struct lg4573 *ctx = panel_to_lg4573(panel);



	lg4573_init(ctx);



	return lg4573_power_on(ctx);

}



static const struct drm_display_mode default_mode = {

	.clock = 27000,

	.hdisplay = 480,

	.hsync_start = 480 + 10,

	.hsync_end = 480 + 10 + 59,

	.htotal = 480 + 10 + 59 + 10,

	.vdisplay = 800,

	.vsync_start = 800 + 15,

	.vsync_end = 800 + 15 + 15,

	.vtotal = 800 + 15 + 15 + 15,

	.vrefresh = 60,

};



static int lg4573_get_modes(struct drm_panel *panel)

{

	struct drm_connector *connector = panel->connector;

	struct drm_display_mode *mode;



	mode = drm_mode_duplicate(panel->drm, &default_mode);

	if (!mode) {

		dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",

			default_mode.hdisplay, default_mode.vdisplay,

			default_mode.vrefresh);

		return -ENOMEM;

	}



	drm_mode_set_name(mode);



	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;

	drm_mode_probed_add(connector, mode);



	panel->connector->display_info.width_mm = 61;

	panel->connector->display_info.height_mm = 103;



	return 1;

}



static const struct drm_panel_funcs lg4573_drm_funcs = {

	.disable = lg4573_disable,

	.enable = lg4573_enable,

	.get_modes = lg4573_get_modes,

};



static int lg4573_probe(struct spi_device *spi)

{

	struct lg4573 *ctx;

	int ret;



	ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);

	if (!ctx)

		return -ENOMEM;



	ctx->spi = spi;



	spi_set_drvdata(spi, ctx);

	spi->bits_per_word = 8;



	ret = spi_setup(spi);

	if (ret < 0) {

		dev_err(&spi->dev, "SPI setup failed: %d\n", ret);

		return ret;

	}



	drm_panel_init(&ctx->panel);

	ctx->panel.dev = &spi->dev;

	ctx->panel.funcs = &lg4573_drm_funcs;



	return drm_panel_add(&ctx->panel);

}



static int lg4573_remove(struct spi_device *spi)

{

	struct lg4573 *ctx = spi_get_drvdata(spi);



	lg4573_display_off(ctx);

	drm_panel_remove(&ctx->panel);



	return 0;

}



static const struct of_device_id lg4573_of_match[] = {

	{ .compatible = "lg,lg4573" },

	{ }

};

MODULE_DEVICE_TABLE(of, lg4573_of_match);



static struct spi_driver lg4573_driver = {

	.probe = lg4573_probe,

	.remove = lg4573_remove,

	.driver = {

		.name = "lg4573",

		.owner = THIS_MODULE,

		.of_match_table = lg4573_of_match,

	},

};

module_spi_driver(lg4573_driver);



MODULE_AUTHOR("Heiko Schocher <hs@denx.de>");

MODULE_DESCRIPTION("lg4573 LCD Driver");

MODULE_LICENSE("GPL v2");