diff options
| -rw-r--r-- | drivers/video/Kconfig | 15 | ||||
| -rw-r--r-- | drivers/video/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/hitachi_tx18d42vm_lcd.c | 81 | ||||
| -rw-r--r-- | drivers/video/hitachi_tx18d42vm_lcd.h | 9 |
4 files changed, 103 insertions, 3 deletions
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index d9d4afcba6a..ccbd7e295dd 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -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 diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 36298684bf9..c3fcf455d26 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -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 diff --git a/drivers/video/hitachi_tx18d42vm_lcd.c b/drivers/video/hitachi_tx18d42vm_lcd.c new file mode 100644 index 00000000000..1ce4a8c93e3 --- /dev/null +++ b/drivers/video/hitachi_tx18d42vm_lcd.c @@ -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; +} diff --git a/drivers/video/hitachi_tx18d42vm_lcd.h b/drivers/video/hitachi_tx18d42vm_lcd.h new file mode 100644 index 00000000000..1b728005f64 --- /dev/null +++ b/drivers/video/hitachi_tx18d42vm_lcd.h @@ -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); |