From: Rob Clark <robdclark@gmail.com>
Date: Tue, 22 Apr 2014 16:27:28 +0000 (-0400)
Subject: drm/msm/mdp4: cure for the cursor blues (v2)
X-Git-Tag: omap-for-v3.16/pm-signed~33^2~6^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d8d9f670513593377cd1442f987ce03a64ba55d;p=pandora-kernel.git

drm/msm/mdp4: cure for the cursor blues (v2)

The hw cursor is relatively adept at triggering underflows, which
manifest as a "blue flash" (since blue is configured as the underflow
color).  Juggle a few things around to tighten up the timing for setting
cursor registers in DONE irq.

And most importantly, don't ever disable the hw cursor.  Instead flip it
to a blank/empty cursor.  This seems far more reliable, as even simply
clearing the cursor-enable bit (with no other updates in previous/
following frames) can in some cases cause underflow.

v1: original
v2: add missing locking spotted by Micah

Cc: Micah Richert <richert@braincorporation.com>
Signed-off-by: Rob Clark <robdclark@gmail.com>
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