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

[Chris Wilson]

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.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre