drm/radeon/cik: use a mutex to properly lock srbm instanced registers
We need proper locking in the driver when accessing instanced
registers on CIK.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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We need proper locking in the driver when accessing instanced
registers on CIK.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>