drm/radeon/kms: Add initial support for async DMA on r6xx/r7xx
Uses the new multi-ring infrastucture. 6xx/7xx has a single
async DMA ring.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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Uses the new multi-ring infrastucture. 6xx/7xx has a single
async DMA ring.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>