drm/amd/powerplay: fix raven issue for sw smu

Raven series doesn't support sw smu so far, so we have to add checking to
confirm it return false while the asic is raven.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
index fe2f7e2..00b7c88 100644
--- a/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
@@ -138,7 +138,7 @@ bool is_support_sw_smu(struct amdgpu_device *adev)
 	if (amdgpu_dpm != 1)
 		return false;
 
-	if (adev->asic_type >= CHIP_VEGA20)
+	if (adev->asic_type >= CHIP_VEGA20 && adev->asic_type != CHIP_RAVEN)
 		return true;
 
 	return false;