Hitachi tx18d42vm LCD panels have an onboard controller which needs some initialization via spi for the panel to become functional as a regular LVDS panel.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- board/sunxi/Kconfig | 4 +++ drivers/video/Makefile | 2 +- drivers/video/sunxi_display.c | 5 +++ drivers/video/sunxi_lcd_panel.c | 68 +++++++++++++++++++++++++++++++++++++++++ drivers/video/sunxi_lcd_panel.h | 9 ++++++ 5 files changed, 87 insertions(+), 1 deletion(-) create mode 100644 drivers/video/sunxi_lcd_panel.c create mode 100644 drivers/video/sunxi_lcd_panel.h
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig index e5aa05b..adee5ed 100644 --- a/board/sunxi/Kconfig +++ b/board/sunxi/Kconfig @@ -369,6 +369,10 @@ config VIDEO_LCD_PANEL_LVDS bool "Generic lvds interface LCD panel" select VIDEO_LCD_IF_LVDS
+config VIDEO_LCD_PANEL_HITACHI_TX18D42VM + bool "Hitachi tx18d42vm LCD panel" + select VIDEO_LCD_IF_LVDS + endchoice
diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 42b1eaa..d4fe1aa 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -39,7 +39,7 @@ obj-$(CONFIG_VIDEO_SANDBOX_SDL) += sandbox_sdl.o obj-$(CONFIG_VIDEO_SED13806) += sed13806.o obj-$(CONFIG_VIDEO_SM501) += sm501.o obj-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o videomodes.o -obj-$(CONFIG_VIDEO_SUNXI) += sunxi_display.o videomodes.o +obj-$(CONFIG_VIDEO_SUNXI) += sunxi_display.o sunxi_lcd_panel.o videomodes.o obj-$(CONFIG_VIDEO_TEGRA) += tegra.o obj-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o obj-$(CONFIG_VIDEO_X86) += x86_fb.o diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c index 47d820d..c3fc732 100644 --- a/drivers/video/sunxi_display.c +++ b/drivers/video/sunxi_display.c @@ -19,6 +19,7 @@ #include <fdtdec.h> #include <fdt_support.h> #include <video_fb.h> +#include "sunxi_lcd_panel.h" #include "videomodes.h"
DECLARE_GLOBAL_DATA_PTR; @@ -487,6 +488,10 @@ static void sunxi_lcdc_panel_enable(void) gpio_request(pin, "lcd_power"); gpio_direction_output(pin, 1); } + +#ifdef CONFIG_VIDEO_LCD_PANEL_HITACHI_TX18D42VM + sunxi_lcd_panel_hitachi_tx18d42vm_init(); +#endif }
static void sunxi_lcdc_backlight_enable(void) diff --git a/drivers/video/sunxi_lcd_panel.c b/drivers/video/sunxi_lcd_panel.c new file mode 100644 index 0000000..9ebaff2 --- /dev/null +++ b/drivers/video/sunxi_lcd_panel.c @@ -0,0 +1,68 @@ +/* + * LCD panel driver for Allwinner SoCs. + * + * (C) Copyright 2015 Hans de Goede hdegoede@redhat.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> + +#include <asm/arch/gpio.h> +#include <asm/gpio.h> +#include <asm/io.h> + +#ifdef CONFIG_VIDEO_LCD_PANEL_HITACHI_TX18D42VM + +#define SPI_CS SUNXI_GPA(0) +#define SPI_CLK SUNXI_GPA(1) +#define SPI_MOSI SUNXI_GPA(2) + +/* + * 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 sunxi_lcd_panel_spi_write(unsigned int data, int bits) +{ + int i, offset; + + gpio_direction_output(SPI_CS, 0); + for (i = 0; i < bits; i++) { + gpio_direction_output(SPI_CLK, 0); + offset = (bits - 1) - i; + gpio_direction_output(SPI_MOSI, (data >> offset) & 1); + udelay(2); + gpio_direction_output(SPI_CLK, 1); + udelay(2); + } + gpio_direction_output(SPI_CS, 1); + udelay(2); +} + +void sunxi_lcd_panel_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; + + mdelay(50); /* Wait for lcd controller power on */ + + for (i = 0; i < ARRAY_SIZE(init_data); i++) + sunxi_lcd_panel_spi_write(init_data[i], 16); + + mdelay(50); /* All the tx18d42vm drivers have a delay here ? */ + + sunxi_lcd_panel_spi_write(0x00ad, 16); /* display on */ +} + +#endif diff --git a/drivers/video/sunxi_lcd_panel.h b/drivers/video/sunxi_lcd_panel.h new file mode 100644 index 0000000..1fb9f1e --- /dev/null +++ b/drivers/video/sunxi_lcd_panel.h @@ -0,0 +1,9 @@ +/* + * LCD panel driver for Allwinner SoCs. + * + * (C) Copyright 2015 Hans de Goede hdegoede@redhat.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +void sunxi_lcd_panel_hitachi_tx18d42vm_init(void);