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| author | Hans de Goede <hdegoede@redhat.com> | 2015-01-25 15:33:07 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2015-02-02 13:57:16 +0100 |
| commit | fb75d972eaf5c887ada28e73d3e84d52931d4cb0 (patch) | |
| tree | 1bd562e1ddadc7242ca3027a898c0f7461bd6501 /configs/A13-OLinuXinoM_defconfig | |
| parent | 8d0df9be927eff1be9aef29aa995f6b54900962e (diff) | |
| download | u-boot-fb75d972eaf5c887ada28e73d3e84d52931d4cb0.tar.gz | |
sunxi: video: Force h/vsync active high when using ext. vga dac on some boards
On both my A13-OLinuxIno and my A13-OLinuxIno-Micro, the vga output gives an
unstable image when active low v or hsync is used.
The problem seems to be specific to the OLinuxIno A13 (normal & micro)
boards. I've just looked up the schematics and they use an opendrain driver
for the vga sync lines, and with sync pulses it is the logical high->low
edge of the pulse which counts for the timing, which with an active low
sync is being driven by the pull-up, and that simply seems to not drive
it hard enough to get a stable image.
So force v and hsync active high on these boards. independent of what the
modeline says. This fixes the unstable image.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Diffstat (limited to 'configs/A13-OLinuXinoM_defconfig')
| -rw-r--r-- | configs/A13-OLinuXinoM_defconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/configs/A13-OLinuXinoM_defconfig b/configs/A13-OLinuXinoM_defconfig index 1c3fc3a3e9..a04f2b3362 100644 --- a/configs/A13-OLinuXinoM_defconfig +++ b/configs/A13-OLinuXinoM_defconfig @@ -4,6 +4,7 @@ CONFIG_FDTFILE="sun5i-a13-olinuxino-micro.dtb" CONFIG_USB1_VBUS_PIN="PG11" CONFIG_VIDEO_HDMI=n CONFIG_VIDEO_VGA_VIA_LCD=y +CONFIG_VIDEO_VGA_VIA_LCD_FORCE_SYNC_ACTIVE_HIGH=y # For use with the Olimex 7" LCD module, adjust timings for other displays # Set video-mode=sunxi:800x600-24@60,monitor=lcd in the env. to enable CONFIG_VIDEO_LCD_MODE="x:800,y:480,depth:18,pclk_khz:33000,le:16,ri:209,up:22,lo:22,hs:30,vs:1,sync:3,vmode:0" |