[Intel-gfx] [PATCH 15/24] drm/i915: initialize DDI buffer translations
eugeni at dodonov.net
Mon Apr 30 17:27:05 PDT 2012
On Mon, Apr 30, 2012 at 21:20, Jesse Barnes <jbarnes at virtuousgeek.org>wrote:
> Ahh these are vswing and preemphasis values for the various types...
> Doesn't look like this goes up to the 19 dwords the docs specify?
The last pair is for HDMI, it is ignored for FDI/DP, so I write it along
with all others to already prepare DDI to work in any mode.
> Usually, double buffered means we need to write a trigger reg somewhere
> for the values to be latched in, or wait for vblank. What's different
I'll double-check, it could be possible that they don't need to be
double-buffered. In the first series I split the double-buffering part
(with a delay) into a separate patch as it made things work more reliable
on my machine, but it got merged when I moved everything to intel_ddi.c.
FDI is not yet stable enough, so I need to find if the issues I was having
with it are due to that, or we really need the double-writing.
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