drm/amdgpu: Reorder to read EFI exported ROM first

On EFI BIOSes, PCI ROM may be exported through EFI_PCI_IO_PROTOCOL and
expansion ROM BARs may not be enabled. Choose to read from EFI exported
ROM data before reading PCI Expansion ROM BAR.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c

@@ -431,6 +431,11 @@ bool amdgpu_get_bios(struct amdgpu_device *adev)
 		goto success;
 	}
 
+	if (amdgpu_read_platform_bios(adev)) {
+		dev_info(adev->dev, "Fetched VBIOS from platform\n");
+		goto success;
+	}
+
 	if (amdgpu_read_bios(adev)) {
 		dev_info(adev->dev, "Fetched VBIOS from ROM BAR\n");
 		goto success;
@@ -446,11 +451,6 @@ bool amdgpu_get_bios(struct amdgpu_device *adev)
 		goto success;
 	}
 
-	if (amdgpu_read_platform_bios(adev)) {
-		dev_info(adev->dev, "Fetched VBIOS from platform\n");
-		goto success;
-	}
-
 	dev_err(adev->dev, "Unable to locate a BIOS ROM\n");
 	return false;