From: Carl Worth <cworth@cworth.org>
Date: Wed, 29 Apr 2009 21:43:54 +0000 (-0700)
Subject: drm/i915: Add new GET_PIPE_FROM_CRTC_ID ioctl.
X-Git-Tag: linux-omap-v2.6.30-rc6~3^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=08d7b3d1edff84bd673d9e9ab36b5aa62e1ba903;p=pandora-kernel.git

drm/i915: Add new GET_PIPE_FROM_CRTC_ID ioctl.

This allows userlevel code to discover the pipe number corresponding
to a given CRTC ID. This is necessary for doing pipe-specific
operations such as waiting for vblank on a given CRTC.  Failure to use
the right pipe mapping can result in GPU hangs, or at least failure
to actually sync to vblank.

Signed-off-by: Carl Worth <cworth@cworth.org>
[anholt: Style touchups from review]
Signed-off-by: Eric Anholt <eric@anholt.net>
---

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