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drm/i915: add set_tail hook in struct intel_ring_buffer

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This is prepared for video codec ring buffer on Sandybridge. It is
needed to read/write more than one register to move the tail pointer of
the video codec ring on Sandybridge.

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Xiang, Haihao
2010-09-16 10:43:12 +08:00
committed by Chris Wilson
parent 5c1143bbec
commit d46eefa297
2 changed files with 19 additions and 5 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -48,6 +48,8 @@ struct intel_ring_buffer {
struct intel_ring_buffer *ring);
unsigned int (*get_tail)(struct drm_device *dev,
struct intel_ring_buffer *ring);
void (*set_tail)(struct drm_device *dev,
u32 value);
unsigned int (*get_active_head)(struct drm_device *dev,
struct intel_ring_buffer *ring);
void (*advance_ring)(struct drm_device *dev,