From: Rob Clark <robdclark@gmail.com>
Date: Tue, 29 Oct 2013 16:05:20 +0000 (-0400)
Subject: drm/msm/mdp4: page_flip cleanups/fixes
X-Git-Tag: v3.13-rc1~76^2~9^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a2b8fa628a5069db1cc984d21a3048ffd485346;p=pandora-kernel.git

drm/msm/mdp4: page_flip cleanups/fixes

There were a few potential problems with the original page_flip/vblank
code in mdp4_crtc.

1) We need vblank irq for a couple things, both completing flips and
   updating cursor.  We need to keep track of what work is pending so
   that (for example) a cursor update while we are still waiting for
   pageflip_cb (ie. pageflip requested from userspace, but still
   waiting for rendering to complete) would not prematurely trigger
   event to userspace.

2) A preclose -> pageflip-cancel should not cancel a pageflip that
   was requested on a different file (ie. non-master closing should
   not cancel a pending pageflip).

With these fixes, we no longer have problems w/ cursor not updating and
with occasional hangs with userspace waiting for a pageflip that had
been cancelled (launching XBMC from gnome-shell overview mode was a good
way to trigger this, but now works reliably).

Signed-off-by: Rob Clark <robdclark@gmail.com>
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