drm/i915: Add intel_ring_handle_seqno wrap

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If there are pre-wrap values in semaphore-mbox registers after wrap,
syncing against some after-wrap request will complete immediately.
Fix this by emitting ring commands to set mbox registers to zero
when the wrap happens.

v2: Use __intel_ring_begin to emit ring commands, from
Chris Wilson.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Add a small comment to handle_seqno_wrap.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Mika Kuoppala 2012-12-04 15:12:04 +02:00 • committed by Daniel Vetter

parent cbcc80dff3

commit 498d2ac15c

3 changed files with 27 additions and 1 deletions

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4

drivers/gpu/drm/i915/i915_gem.c

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22

drivers/gpu/drm/i915/intel_ringbuffer.c

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2

drivers/gpu/drm/i915/intel_ringbuffer.h

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