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video: Add support for Hitachi tx18d42vm LVDS LCD panels

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Add support for Hitachi tx18d42vm LVDS LCD panels, these panels have a
lcd controller which needs to be initialized over SPI, once that is
done they work like a regular LVDS panel.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Hans de Goede 2015-01-20 09:22:26 +01:00
parent 1a800f7af3
commit a5464f2bd2
4 changed files with 103 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/video/Kconfig
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@ -36,9 +36,18 @@ config VIDEO_LCD_SSD2828_RESET
The reset pin of SSD2828 chip. This takes a string in the format
understood by 'name_to_gpio' function, e.g. PH1 for pin 1 of port H.
config VIDEO_LCD_HITACHI_TX18D42VM
bool "Hitachi tx18d42vm LVDS LCD panel support"
depends on VIDEO
default n
---help---
Support for Hitachi tx18d42vm LVDS LCD panels, these panels have a
lcd controller which needs to be initialized over SPI, once that is
done they work like a regular LVDS panel.
config VIDEO_LCD_SPI_CS
string "SPI CS pin for LCD related config job"
depends on VIDEO_LCD_SSD2828
depends on VIDEO_LCD_SSD2828 || VIDEO_LCD_HITACHI_TX18D42VM
default ""
---help---
This is one of the SPI communication pins, involved in setting up a
@ -48,7 +57,7 @@ config VIDEO_LCD_SPI_CS
config VIDEO_LCD_SPI_SCLK
string "SPI SCLK pin for LCD related config job"
depends on VIDEO_LCD_SSD2828
depends on VIDEO_LCD_SSD2828 || VIDEO_LCD_HITACHI_TX18D42VM
default ""
---help---
This is one of the SPI communication pins, involved in setting up a
@ -58,7 +67,7 @@ config VIDEO_LCD_SPI_SCLK
config VIDEO_LCD_SPI_MOSI
string "SPI MOSI pin for LCD related config job"
depends on VIDEO_LCD_SSD2828
depends on VIDEO_LCD_SSD2828 || VIDEO_LCD_HITACHI_TX18D42VM
default ""
---help---
This is one of the SPI communication pins, involved in setting up a

1
drivers/video/Makefile
View File

@ -29,6 +29,7 @@ obj-$(CONFIG_VIDEO_COREBOOT) += coreboot_fb.o
obj-$(CONFIG_VIDEO_CT69000) += ct69000.o videomodes.o
obj-$(CONFIG_VIDEO_DA8XX) += da8xx-fb.o videomodes.o
obj-$(CONFIG_VIDEO_IMX25LCDC) += imx25lcdc.o videomodes.o
obj-$(CONFIG_VIDEO_LCD_HITACHI_TX18D42VM) += hitachi_tx18d42vm_lcd.o
obj-$(CONFIG_VIDEO_LCD_SSD2828) += ssd2828.o
obj-$(CONFIG_VIDEO_MB862xx) += mb862xx.o videomodes.o
obj-$(CONFIG_VIDEO_MB86R0xGDC) += mb86r0xgdc.o videomodes.o

81
drivers/video/hitachi_tx18d42vm_lcd.c Normal file
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@ -0,0 +1,81 @@
/*
* Hitachi tx18d42vm LVDS LCD panel driver
*
* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/gpio.h>
#include <errno.h>
/*
* Very simple write only SPI support, this does not use the generic SPI infra
* because that assumes R/W SPI, requiring a MISO pin. Also the necessary glue
* code alone would be larger then this minimal version.
*/
static void lcd_panel_spi_write(int cs, int clk, int mosi,
unsigned int data, int bits)
{
int i, offset;
gpio_direction_output(cs, 0);
for (i = 0; i < bits; i++) {
gpio_direction_output(clk, 0);
offset = (bits - 1) - i;
gpio_direction_output(mosi, (data >> offset) & 1);
udelay(2);
gpio_direction_output(clk, 1);
udelay(2);
}
gpio_direction_output(cs, 1);
udelay(2);
}
int hitachi_tx18d42vm_init(void)
{
const u16 init_data[] = {
0x0029, /* reset */
0x0025, /* standby */
0x0840, /* enable normally black */
0x0430, /* enable FRC/dither */
0x385f, /* enter test mode(1) */
0x3ca4, /* enter test mode(2) */
0x3409, /* enable SDRRS, enlarge OE width */
0x4041, /* adopt 2 line / 1 dot */
};
int i, cs, clk, mosi, ret = 0;
cs = name_to_gpio(CONFIG_VIDEO_LCD_SPI_CS);
clk = name_to_gpio(CONFIG_VIDEO_LCD_SPI_SCLK);
mosi = name_to_gpio(CONFIG_VIDEO_LCD_SPI_MOSI);
if (cs == -1 || clk == -1 || mosi == 1) {
printf("Error tx18d42vm spi gpio config is invalid\n");
return -EINVAL;
}
if (gpio_request(cs, "tx18d42vm-spi-cs") != 0 ||
gpio_request(clk, "tx18d42vm-spi-clk") != 0 ||
gpio_request(mosi, "tx18d42vm-spi-mosi") != 0) {
printf("Error cannot request tx18d42vm spi gpios\n");
ret = -EBUSY;
goto out;
}
for (i = 0; i < ARRAY_SIZE(init_data); i++)
lcd_panel_spi_write(cs, clk, mosi, init_data[i], 16);
mdelay(50); /* All the tx18d42vm drivers have a delay here ? */
lcd_panel_spi_write(cs, clk, mosi, 0x00ad, 16); /* display on */
out:
gpio_free(mosi);
gpio_free(clk);
gpio_free(cs);
return ret;
}

9
drivers/video/hitachi_tx18d42vm_lcd.h Normal file
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@ -0,0 +1,9 @@
/*
* Hitachi tx18d42vm LVDS LCD panel driver
*
* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
void hitachi_tx18d42vm_init(void);