V3s_Allwinner
/
uboot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 2 Wiki Activity

sunxi: video: Add support for external DAC enable pin 

The external DAC for VGA output might have either a power or reset
control pin that needs to be pulled up, as is the case on the
Hummingbird A31.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Chen-Yu Tsai 2015-01-12 18:02:11 +08:00 committed by Hans de Goede
parent 2583d5b192
commit 507e27dfc9
2 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
board/sunxi/Kconfig
View File

@ -314,6 +314,14 @@ config VIDEO_VGA_VIA_LCD
LCD interface driving a VGA connector, such as found on the
Olimex A13 boards.
config VIDEO_VGA_EXTERNAL_DAC_EN
string "LCD panel power enable pin"
depends on VIDEO_VGA_VIA_LCD
default ""
---help---
Set the enable pin for the external VGA DAC. This takes a string in the
format understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H.
config VIDEO_LCD_MODE
string "LCD panel timing details"
depends on VIDEO

14
drivers/video/sunxi_display.c
View File

@ -813,6 +813,19 @@ static void sunxi_drc_init(void)
#endif
}
#ifdef CONFIG_VIDEO_VGA_VIA_LCD
static void sunxi_vga_external_dac_enable(void)
{
int pin;
pin = sunxi_name_to_gpio(CONFIG_VIDEO_VGA_EXTERNAL_DAC_EN);
if (pin != -1) {
gpio_request(pin, "vga_enable");
gpio_direction_output(pin, 1);
}
}
#endif /* CONFIG_VIDEO_VGA_VIA_LCD */
static void sunxi_engines_init(void)
{
sunxi_composer_init();
@ -860,6 +873,7 @@ static void sunxi_mode_set(const struct ctfb_res_modes *mode,
sunxi_lcdc_tcon0_mode_set(mode);
sunxi_composer_enable();
sunxi_lcdc_enable();
sunxi_vga_external_dac_enable();
#endif
break;
}