drm/radeon: update rptr saving logic for memory buffers
authorAlex Deucher <alexander.deucher@amd.com>
Tue, 17 Jul 2012 18:02:31 +0000 (14:02 -0400)
committerChristian König <deathsimple@vodafone.de>
Wed, 18 Jul 2012 11:53:17 +0000 (13:53 +0200)
Add support for using memory buffers rather than
scratch registers.  Some rings may not be able to
write to scratch registers.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

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