commit 08d7b3d1edff84bd673d9e9ab36b5aa62e1ba903
author Carl Worth <cworth@cworth.org> Wed Apr 29 14:43:54 2009 -0700
committer Eric Anholt <eric@anholt.net> Thu May 14 16:00:32 2009 -0700
tree 0dcbb40ceb39aafab750bb06e2cd165dd906f8d3
parent 9d2949a4cdb77b9b5c243c79be6489d34d770c7c

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>