From: Ian Campbell <ijc+uboot@hellion.org.uk>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 4/4] sunxi: video: Force h/vsync active high when using ext. vga dac
Date: Wed, 28 Jan 2015 09:13:45 +0000 [thread overview]
Message-ID: <1422436425.29309.31.camel@hellion.org.uk> (raw)
In-Reply-To: <1422196540-18093-4-git-send-email-hdegoede@redhat.com>
On Sun, 2015-01-25 at 15:35 +0100, Hans de Goede wrote:
> 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, so when an external vga dac
> is used force v and hsync active high independent of what the modeline says.
Does this not just mean the modeline is wrong and should be fixed or an
alternative provided which is correct for these systems?
In the code comment you say "some dacs", what about ones which don't
have this issue or, worse, ones which have the inverse issue and don't
work with active high?
At the least I'd say this aught to be controllable via Kconfig.
Ian.
next prev parent reply other threads:[~2015-01-28 9:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-25 14:35 [U-Boot] [PATCH 1/4] sunxi: Convert sun5i boards to use auto dram configuration Hans de Goede
2015-01-25 14:35 ` [U-Boot] [PATCH 2/4] sunxi: Add a GMAC Transmit Clock Delay Chain Kconfig option Hans de Goede
2015-01-28 9:10 ` Ian Campbell
2015-01-25 14:35 ` [U-Boot] [PATCH 3/4] sunxi: Remove CONFIG_TARGET_FOO for sun5i and sun7i boards Hans de Goede
2015-01-28 9:10 ` Ian Campbell
2015-01-25 14:35 ` [U-Boot] [PATCH 4/4] sunxi: video: Force h/vsync active high when using ext. vga dac Hans de Goede
2015-01-28 9:13 ` Ian Campbell [this message]
2015-01-28 9:37 ` Hans de Goede
2015-01-28 9:08 ` [U-Boot] [PATCH 1/4] sunxi: Convert sun5i boards to use auto dram configuration Ian Campbell
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