[Intel-gfx] [PATCH] drm/i915: always set FDI composite sync bit
ajax at redhat.com
Tue Oct 11 07:10:24 PDT 2011
On 10/10/11 7:22 PM, Keith Packard wrote:
> On Mon, 10 Oct 2011 14:28:52 -0700, Jesse Barnes<jbarnes at virtuousgeek.org> wrote:
>> It's needed for 3 pipe support as well as just regular functionality
>> (e.g. DisplayPort).
> Any explanation on how you get sync without this? As in, why did this
> ever work?
To a first approximation, it didn't. I was never able to get anything
reliably lit up besides the boot output (and only that one; hotplug
after was a disaster).
I don't have register dumps handy to compare BIOS setup with this
change, but I could if needed.
It still seems entirely magical and probably wrong in some situations.
And I'm thrilled to see that PPT is functionally different from CPT
(seriously, stop doing that) instead of just moving bit definitions
around (seriously, stop doing that). But this change is massively
better than before.
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