drm/amdgpu: Do not program IH_CHICKEN in vega20_ih.c under SRIOV

IH_CHICKEN is blocked for VF writes; this access should be skipped.
Signed-off-by: Victor Lu <victorchengchi.lu@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/vega20_ih.c

@@ -291,6 +291,7 @@ static int vega20_ih_irq_init(struct amdgpu_device *adev)
 
 	adev->nbio.funcs->ih_control(adev);
 
+	if (!amdgpu_sriov_vf(adev)) {
 		if ((amdgpu_ip_version(adev, OSSSYS_HWIP, 0) == IP_VERSION(4, 2, 1)) &&
 		    adev->firmware.load_type == AMDGPU_FW_LOAD_DIRECT) {
 			ih_chicken = RREG32_SOC15(OSSSYS, 0, mmIH_CHICKEN);
@@ -313,6 +314,7 @@ static int vega20_ih_irq_init(struct amdgpu_device *adev)
 			}
 			WREG32_SOC15(OSSSYS, 0, mmIH_CHICKEN_ALDEBARAN, ih_chicken);
 		}
+	}
 
 	for (i = 0; i < ARRAY_SIZE(ih); i++) {
 		if (ih[i]->ring_size) {