drm/amdgpu:fix ring_write_multiple

ring_write_multiple should use buf_mask instead of ptr_mask

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Monk Liu 2017-03-23 16:10:04 +08:00 • committed by Alex Deucher
commit 5846e35569