drm/amdgpu: Implement doorbell self-ring for NBIO 7.4
[ Upstream commit 12292519 ] Fixes doorbell reflection on Vega20. Change-Id: I0495139d160a9032dff5977289b1eec11c16f781 Signed-off-by:Jay Cornwall <Jay.Cornwall@amd.com> Reviewed-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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