drm/amdgpu/{uvd,vcn}: fetch ring's read_ptr after alloc
[What] readptr read always returns zero, since most likely these blocks are either power or clock gated. [How] fetch rptr after amdgpu_ring_alloc() which informs the power management code that the block is about to be used and hence the gating is turned off. Signed-off-by: NLouis Li <Ching-shih.Li@amd.com> Signed-off-by: NShirish S <shirish.s@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
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