drm/amdgpu: Notify sbios device ready before send request
authorRex Zhu <Rex.Zhu@amd.com>
Tue, 27 Feb 2018 10:20:53 +0000 (18:20 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 15 Mar 2018 09:54:31 +0000 (10:54 +0100)
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.deucher@amd.com>
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c

index 57afad79f55d086b673cd6c61c688d532620a033..8fa850a070e0fe8ea7a67823008ff7e543d8d1dc 100644 (file)
@@ -540,6 +540,9 @@ int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
        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)