[Intel-gfx] [PATCH] drm/i915: dp: increase probe retries

[Takashi Iwai]

At Tue, 6 Aug 2013 13:51:32 +0100,
Chris Wilson wrote:
> 
> On Tue, Aug 06, 2013 at 02:40:24PM +0200, Takashi Iwai wrote:
> > We've seen a problem that the DP port on a docking station is often
> > not detected properly or misconfigured (no proper native modes) with a
> > Haswell-based laptop.  The trace showed that the driver gave up or got
> > only insufficient EDID, maybe due to some unstable aux communication.
> > 
> > As a band-aid fix, increase the number of retries from 5 to 10.
> > This seems enough for our cases.
> 
> Did you test with
> 
> commit bc86625a4ff7574d4d4dba79723457711eb784e0
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Sun Jul 21 16:00:03 2013 +0100
> 
>     drm/i915: Retry DP aux_ch communications with a different clock after failures
> 
> That sounds like a relevant workaround.

This seems also stabilizing the DP detection.
Will check more and give back if I still encounter a problem.


Thanks!

Takashi