From: Stephane Viau <sviau@codeaurora.org>
Date: Fri, 20 Feb 2015 21:30:56 +0000 (-0500)
Subject: drm/msm/mdp5: Avoid flushing registers when CRTC is disabled
X-Git-Tag: omap-for-v4.1/wl12xx-dt~53^2~2^2~4
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ba0312a6108f5214efb4659c4dbba218c5b9eb8d;p=pandora-kernel.git

drm/msm/mdp5: Avoid flushing registers when CRTC is disabled

When a CRTC is disabled, no CTL is allocated to it (CRTC->ctl == NULL);
in that case we should not try to FLUSH registers and do nothing instead.

This can happen when we try to move a cursor but the CRTC's CTL
(CONTROL) has not been allocated yet (inactive CRTC).
It can also happens when we .atomic_check()/.atomic_flush() on a
disabled CRTC.

A CTL needs to be kept as long as the CRTC is alive. Releasing it
after the last VBlank is safer than in .atomic_flush().

Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
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