drm/amdgpu: only check mmBIF_IOV_FUNC_IDENTIFIER on tonga/fiji

We only support SR-IOV on tonga/fiji.  Don't check this register
on other VI parts.

Fixes: 048765ad (amdgpu: fix asic initialization for virtualized environments (v2))
Reviewed-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

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

@@ -449,7 +449,11 @@ static bool vi_read_bios_from_rom(struct amdgpu_device *adev,
 
 static void vi_detect_hw_virtualization(struct amdgpu_device *adev)
 {
-	uint32_t reg = RREG32(mmBIF_IOV_FUNC_IDENTIFIER);
+	uint32_t reg = 0;
+
+	if (adev->asic_type == CHIP_TONGA ||
+	    adev->asic_type == CHIP_FIJI) {
+	       reg = RREG32(mmBIF_IOV_FUNC_IDENTIFIER);
 	       /* bit0: 0 means pf and 1 means vf */
 	       /* bit31: 0 means disable IOV and 1 means enable */
 	       if (reg & 1)
@@ -457,6 +461,7 @@ static void vi_detect_hw_virtualization(struct amdgpu_device *adev)
 
 	       if (reg & 0x80000000)
 		       adev->virt.caps |= AMDGPU_SRIOV_CAPS_ENABLE_IOV;
+	}
 
 	if (reg == 0) {
 		if (is_virtual_machine()) /* passthrough mode exclus sr-iov mode */