drm/amdgpu: introduce pcie port read/write entry
This patch adds pcie port read/write entry, because it will be also used on si dpm part. Acked-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NHuang Rui <ray.huang@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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