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drm/i915: add i915_lp_ring_sync helper

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This just waits until the hw passed the current ring position with
cmd execution. This slightly changes the existing i915_wait_request
function to make uninterruptible waiting possible - no point in
returning to userspace while mucking around with the overlay, that
piece of hw is just too fragile.

Also replace a magic 0 with the symbolic constant (and kill the then
superflous comment) while I was looking at the code.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Daniel Vetter 2009-09-15 22:57:32 +02:00 • committed by Eric Anholt
parent 7a9c906094
commit 48764bf43f
3 changed files with 41 additions and 11 deletions
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2
include/drm/drm_os_linux.h
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@ -123,5 +123,5 @@ do { \
remove_wait_queue(&(queue), &entry); \
} while (0)
#define DRM_WAKEUP( queue ) wake_up_interruptible( queue )
#define DRM_WAKEUP( queue ) wake_up( queue )
#define DRM_INIT_WAITQUEUE( queue ) init_waitqueue_head( queue )