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authorHans de Goede <hdegoede@redhat.com>2014-12-28 09:13:21 +0100
committerHans de Goede <hdegoede@redhat.com>2015-01-14 14:56:39 +0100
commit7fad8a98020a0ead8b7bdd5f6b5eaf49b91658b5 (patch)
tree9be5434cca311768081bbbf62b53c3aceae6ae85 /doc/README.video
parentd9786d23808fcbc5dd3bd3913b036d42dd48653f (diff)
sunxi: video: Add a hpd_delay parameter to configure hpd delay
In some extreme cases it may be necessary to wait 1.5 seconds or more for a hpd signal to show up (and be able to read edid info), but we do not want to penalize all headless boots with an extra second boot delay, so add a hpd_delay parameter which can be set through the video-mode env. variable. While at it raise the default from 300ms to 500ms as 300 may very well be too low in many cases. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk>
Diffstat (limited to 'doc/README.video')
-rw-r--r--doc/README.video8
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/README.video b/doc/README.video
index 2c55d6a4726..d0a3ad6e8d4 100644
--- a/doc/README.video
+++ b/doc/README.video
@@ -53,6 +53,12 @@ The sunxi u-boot driver supports the following video-mode options:
1: Enabled. Fallback to the lcd / vga / none in that order (if available)
Defaults to hpd=1.
+- hpd_delay=<int> - How long to wait for the hdmi HPD signal in milliseconds
+ When the monitor and the board power up at the same time, it may take some
+ time for the monitor to assert the HPD signal. This configures how long to
+ wait for the HPD signal before assuming no cable is connected.
+ Defaults to hpd_delay=500.
+
- edid=[0|1] - Enable use of DDC + EDID to get monitor info
0: Disabled.
1: Enabled. If valid EDID info was read from the monitor the EDID info will
@@ -61,4 +67,4 @@ The sunxi u-boot driver supports the following video-mode options:
For example to always use the hdmi connector, even if no cable is inserted,
using edid info when available and otherwise initalizing it at 1024x768@60Hz,
-use: video-mode=sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1 .
+use: "setenv video-mode sunxi:1024x768-24@60,monitor=dvi,hpd=0,edid=1".