4.14-stable review patch.  If anyone has any objections, please let me know.


From: Rex Zhu <rex....@amd.com>

commit 1bced75f4ab04bec55aecb57d99435dc6d0ae5a0 upstream.

it is required if a platform supports PCIe root complex
core voltage reduction. After receiving this notification,
SBIOS can apply default PCIe root complex power policy.

Reviewed-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Rex Zhu <rex....@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -540,6 +540,9 @@ int amdgpu_acpi_pcie_performance_request
        size_t size;
        u32 retry = 3;
+       if (amdgpu_acpi_pcie_notify_device_ready(adev))
+               return -EINVAL;
        /* Get the device handle */
        handle = ACPI_HANDLE(&adev->pdev->dev);
        if (!handle)

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