drm/amdgpu: ungate power gating when system suspend

[Why] During suspend, if GFX DPM is enabled and GFXOFF feature is
enabled the system may get hung. So, it is suggested to disable
GFXOFF feature during suspend and enable it after resume.

[How] Update the code to disable GFXOFF feature during suspend and enable
it after resume.

[  311.396526] amdgpu 0000:03:00.0: amdgpu: SMU: I'm not done with your previous command: SMN_C2PMSG_66:0x0000001E SMN_C2PMSG_82:0x00000000
[  311.396530] amdgpu 0000:03:00.0: amdgpu: Fail to disable dpm features!
[  311.396531] [drm:amdgpu_device_ip_suspend_phase2 [amdgpu]] *ERROR* suspend of IP block <smu> failed -62
Acked-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Signed-off-by: Kun Liu <kun.liu2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -3498,6 +3498,8 @@ static void gfx_v10_0_ring_invalidate_tlbs(struct amdgpu_ring *ring,
 static void gfx_v10_0_update_spm_vmid_internal(struct amdgpu_device *adev,
 					       unsigned int vmid);
 
+static int gfx_v10_0_set_powergating_state(void *handle,
+					  enum amd_powergating_state state);
 static void gfx10_kiq_set_resources(struct amdgpu_ring *kiq_ring, uint64_t queue_mask)
 {
 	amdgpu_ring_write(kiq_ring, PACKET3(PACKET3_SET_RESOURCES, 6));
@@ -7179,6 +7181,13 @@ static int gfx_v10_0_hw_fini(void *handle)
 	amdgpu_irq_put(adev, &adev->gfx.priv_reg_irq, 0);
 	amdgpu_irq_put(adev, &adev->gfx.priv_inst_irq, 0);
 
+	/* WA added for Vangogh asic fixing the SMU suspend failure
+	 * It needs to set power gating again during gfxoff control
+	 * otherwise the gfxoff disallowing will be failed to set.
+	 */
+	if (amdgpu_ip_version(adev, GC_HWIP, 0) == IP_VERSION(10, 3, 1))
+		gfx_v10_0_set_powergating_state(handle, AMD_PG_STATE_UNGATE);
+
 	if (!adev->no_hw_access) {
 		if (amdgpu_async_gfx_ring) {
 			if (amdgpu_gfx_disable_kgq(adev, 0))