[Intel-gfx] [PATCH] drm/i915: Retry reading the PCH FDI receiver ISR

Jesse Barnes jbarnes at virtuousgeek.org
Fri Mar 2 19:03:58 CET 2012

On Fri,  2 Mar 2012 12:53:39 -0500
Sean Paul <seanpaul at chromium.org> wrote:

> According to the PRM (Vol3P2), the PCH FDI receiver ISR read for bit lock
> should be retried at least once. This patch retries the read 5 times
> with a small delay in between reads. I've had reports of display corruption
> on resume with "FDI train 1 fail!", so I'm hoping that adding this retry
> will mitigate the issue.
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---

Yeah seems fine.  I think we don't quite match the training sequence in
the docs for other generations either, but failures haven't been common
so dealing with things case by case like this is fine.

Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>

Jesse Barnes, Intel Open Source Technology Center
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