drm/amd/amdgpu: Update VCN initizalization behvaior
- Issue:
In the original vcn3.0 code, it assumes that the VCN's
init_status is always 1, even after the MMSCH
updates the header.
This is incorrect since by default, it should be set to 0,
and MMSCH will update it to 1 if VCN is ready.
- Fix:
We need to read back the table header after send it to MMSCH.
After that, if a VCN instance is not ready (host disabled it),
we needs to disable the ring buffer as well.
Signed-off-by: Bokun Zhang <Bokun.Zhang@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>