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Commit ff219937 authored by Andrzej Hajda's avatar Andrzej Hajda Committed by Inki Dae
Browse files

drm/panel: add ld9040 driver 



The patch adds LD9040 parallel RGB panel driver with SPI control interface.
The driver uses drm_panel framework.

Signed-off-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
parent 88072c39

drivers/gpu/drm/panel/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -16,4 +16,11 @@ config DRM_PANEL_SIMPLE 
	  that it can be automatically turned off when the panel goes into a

	  low power state.



config DRM_PANEL_LD9040

	tristate "LD9040 RGB/SPI panel"

	depends on DRM && DRM_PANEL

	depends on OF

	select SPI

	select VIDEOMODE_HELPERS



endmenu

drivers/gpu/drm/panel/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o

obj-$(CONFIG_DRM_PANEL_LD9040) += panel-ld9040.o

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

0 → 100644
+376 −0
Original line number Diff line number Diff line 
/*

 * 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>



/* Manufacturer Command Set */

#define MCS_MANPWR		0xb0

#define MCS_ELVSS_ON		0xb1

#define MCS_USER_SETTING	0xf0

#define MCS_DISPCTL		0xf2

#define MCS_GTCON		0xf7

#define MCS_PANEL_CONDITION	0xf8

#define MCS_GAMMA_SET1		0xf9

#define MCS_GAMMA_CTRL		0xfb



/* array of gamma tables for gamma value 2.2 */

static u8 const ld9040_gammas[25][22] = {

	{ 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0,

	  0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 },

	{ 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf,

	  0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 },

	{ 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe,

	  0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 },

	{ 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc,

	  0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d },

	{ 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc,

	  0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 },

	{ 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb,

	  0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 },

	{ 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb,

	  0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c },

	{ 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb,

	  0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 },

	{ 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba,

	  0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 },

	{ 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba,

	  0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a },

	{ 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba,

	  0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e },

	{ 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8,

	  0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 },

	{ 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9,

	  0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 },

	{ 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8,

	  0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 },

	{ 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8,

	  0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d },

	{ 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8,

	  0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 },

	{ 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8,

	  0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 },

	{ 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7,

	  0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 },

	{ 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7,

	  0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a },

	{ 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6,

	  0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d },

	{ 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6,

	  0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 },

	{ 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7,

	  0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 },

	{ 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5,

	  0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 },

	{ 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6,

	  0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa },

	{ 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4,

	  0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 },

};



struct ld9040 {

	struct device *dev;

	struct drm_panel panel;



	struct regulator_bulk_data supplies[2];

	struct gpio_desc *reset_gpio;

	u32 power_on_delay;

	u32 reset_delay;

	struct videomode vm;

	u32 width_mm;

	u32 height_mm;



	int brightness;



	/* This field is tested by functions directly accessing bus before

	 * transfer, transfer is skipped if it is set. In case of transfer

	 * failure or unexpected response the field is set to error value.

	 * Such construct allows to eliminate many checks in higher level

	 * functions.

	 */

	int error;

};



#define panel_to_ld9040(p) container_of(p, struct ld9040, panel)



static int ld9040_clear_error(struct ld9040 *ctx)

{

	int ret = ctx->error;



	ctx->error = 0;

	return ret;

}



static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data)

{

	struct spi_device *spi = to_spi_device(ctx->dev);

	struct spi_transfer xfer = {

		.len		= 2,

		.tx_buf		= &data,

	};

	struct spi_message msg;



	spi_message_init(&msg);

	spi_message_add_tail(&xfer, &msg);



	return spi_sync(spi, &msg);

}



static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len)

{

	int ret = 0;



	if (ctx->error < 0 || len == 0)

		return;



	dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", len, data);

	ret = ld9040_spi_write_word(ctx, *data);



	while (!ret && --len) {

		++data;

		ret = ld9040_spi_write_word(ctx, *data | 0x100);

	}



	if (ret) {

		dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret, len,

			data);

		ctx->error = ret;

	}



	usleep_range(300, 310);

}



#define ld9040_dcs_write_seq_static(ctx, seq...) \

({\

	static const u8 d[] = { seq };\

	ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\

})



static void ld9040_brightness_set(struct ld9040 *ctx)

{

	ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness],

			 ARRAY_SIZE(ld9040_gammas[ctx->brightness]));



	ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a);

}



static void ld9040_init(struct ld9040 *ctx)

{

	ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a);

	ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,

		0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d,

		0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d,

		0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02);

	ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL,

		0x02, 0x08, 0x08, 0x10, 0x10);

	ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04);

	ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16);

	ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00);

	ld9040_brightness_set(ctx);

	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);

	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);

}



static int ld9040_power_on(struct ld9040 *ctx)

{

	int ret;



	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);

	if (ret < 0)

		return ret;



	msleep(ctx->power_on_delay);

	gpiod_set_value(ctx->reset_gpio, 0);

	msleep(ctx->reset_delay);

	gpiod_set_value(ctx->reset_gpio, 1);

	msleep(ctx->reset_delay);



	return 0;

}



static int ld9040_power_off(struct ld9040 *ctx)

{

	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);

}



static int ld9040_disable(struct drm_panel *panel)

{

	struct ld9040 *ctx = panel_to_ld9040(panel);



	msleep(120);

	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);

	ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);

	msleep(40);



	ld9040_clear_error(ctx);



	return ld9040_power_off(ctx);

}



static int ld9040_enable(struct drm_panel *panel)

{

	struct ld9040 *ctx = panel_to_ld9040(panel);

	int ret;



	ret = ld9040_power_on(ctx);

	if (ret < 0)

		return ret;



	ld9040_init(ctx);



	ret = ld9040_clear_error(ctx);



	if (ret < 0)

		ld9040_disable(panel);



	return ret;

}



static int ld9040_get_modes(struct drm_panel *panel)

{

	struct drm_connector *connector = panel->connector;

	struct ld9040 *ctx = panel_to_ld9040(panel);

	struct drm_display_mode *mode;



	mode = drm_mode_create(connector->dev);

	if (!mode) {

		DRM_ERROR("failed to create a new display mode\n");

		return 0;

	}



	drm_display_mode_from_videomode(&ctx->vm, mode);

	mode->width_mm = ctx->width_mm;

	mode->height_mm = ctx->height_mm;

	connector->display_info.width_mm = mode->width_mm;

	connector->display_info.height_mm = mode->height_mm;



	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;

	drm_mode_probed_add(connector, mode);



	return 1;

}



static const struct drm_panel_funcs ld9040_drm_funcs = {

	.disable = ld9040_disable,

	.enable = ld9040_enable,

	.get_modes = ld9040_get_modes,

};



static int ld9040_parse_dt(struct ld9040 *ctx)

{

	struct device *dev = ctx->dev;

	struct device_node *np = dev->of_node;

	int ret;



	ret = of_get_videomode(np, &ctx->vm, 0);

	if (ret < 0)

		return ret;



	of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);

	of_property_read_u32(np, "reset-delay", &ctx->reset_delay);

	of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);

	of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);



	return 0;

}



static int ld9040_probe(struct spi_device *spi)

{

	struct device *dev = &spi->dev;

	struct ld9040 *ctx;

	int ret;



	ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL);

	if (!ctx)

		return -ENOMEM;



	spi_set_drvdata(spi, ctx);



	ctx->dev = dev;

	ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1;



	ret = ld9040_parse_dt(ctx);

	if (ret < 0)

		return ret;



	ctx->supplies[0].supply = "vdd3";

	ctx->supplies[1].supply = "vci";

	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),

				      ctx->supplies);

	if (ret < 0)

		return ret;



	ctx->reset_gpio = devm_gpiod_get(dev, "reset");

	if (IS_ERR(ctx->reset_gpio)) {

		dev_err(dev, "cannot get reset-gpios %ld\n",

			PTR_ERR(ctx->reset_gpio));

		return PTR_ERR(ctx->reset_gpio);

	}

	ret = gpiod_direction_output(ctx->reset_gpio, 1);

	if (ret < 0) {

		dev_err(dev, "cannot configure reset-gpios %d\n", ret);

		return ret;

	}



	spi->bits_per_word = 9;

	ret = spi_setup(spi);

	if (ret < 0) {

		dev_err(dev, "spi setup failed.\n");

		return ret;

	}



	drm_panel_init(&ctx->panel);

	ctx->panel.dev = dev;

	ctx->panel.funcs = &ld9040_drm_funcs;



	return drm_panel_add(&ctx->panel);

}



static int ld9040_remove(struct spi_device *spi)

{

	struct ld9040 *ctx = spi_get_drvdata(spi);



	ld9040_power_off(ctx);

	drm_panel_remove(&ctx->panel);



	return 0;

}



static struct of_device_id ld9040_of_match[] = {

	{ .compatible = "samsung,ld9040" },

	{ }

};

MODULE_DEVICE_TABLE(of, ld9040_of_match);



static struct spi_driver ld9040_driver = {

	.probe		= ld9040_probe,

	.remove		= ld9040_remove,

	.driver = {

		.name	= "ld9040",

		.owner	= THIS_MODULE,

		.of_match_table = ld9040_of_match,

	},

};

module_spi_driver(ld9040_driver);



MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");

MODULE_DESCRIPTION("ld9040 LCD Driver");

MODULE_LICENSE("GPL v2");