mirror of
https://xff.cz/git/u-boot/
synced 2025-10-31 18:35:42 +01:00
a5464f2bd2
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>
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
|
|
* 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;
|
|
}
|