drm/amdgpu: put the SMC into the proper state on reset/unload

When doing a GPU reset or unloading the driver, we need to
put the SMU into the apprpriate state for the re-init after
the reset or unload to reliably work.

I don't think this is necessary for BACO because the SMU actually
controls the BACO state to it needs to be active.

For suspend (S3), the asic is put into D3 so the SMU would be
powered down so I don't think we need to put the SMU into
any special state.

Reviewed-by: Evan Quan <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

···
 	/* record last mm index being written through WREG32*/
 	unsigned long last_mm_index;
 	bool                            in_gpu_reset;
+	enum pp_mp1_state               mp1_state;
 	struct mutex  lock_reset;
 	struct amdgpu_doorbell_index doorbell_index;
 

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

···
 			DRM_ERROR("suspend of IP block <%s> failed %d\n",
 				  adev->ip_blocks[i].version->funcs->name, r);
 		}
+		/* handle putting the SMC in the appropriate state */
+		if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_SMC) {
+			if (is_support_sw_smu(adev)) {
+				/* todo */
+			} else if (adev->powerplay.pp_funcs &&
+				   adev->powerplay.pp_funcs->set_mp1_state) {
+				r = adev->powerplay.pp_funcs->set_mp1_state(
+					adev->powerplay.pp_handle,
+					adev->mp1_state);
+				if (r) {
+					DRM_ERROR("SMC failed to set mp1 state %d, %d\n",
+						  adev->mp1_state, r);
+				}
+			}
+		}
 	}
 
 	return 0;
···
 
 	atomic_inc(&adev->gpu_reset_counter);
 	adev->in_gpu_reset = 1;
+	switch (amdgpu_asic_reset_method(adev)) {
+	case AMD_RESET_METHOD_MODE1:
+		adev->mp1_state = PP_MP1_STATE_SHUTDOWN;
+		break;
+	case AMD_RESET_METHOD_MODE2:
+		adev->mp1_state = PP_MP1_STATE_RESET;
+		break;
+	default:
+		adev->mp1_state = PP_MP1_STATE_NONE;
+		break;
+	}
 	/* Block kfd: SRIOV would do it separately */
 	if (!amdgpu_sriov_vf(adev))
                 amdgpu_amdkfd_pre_reset(adev);
···
 	if (!amdgpu_sriov_vf(adev))
                 amdgpu_amdkfd_post_reset(adev);
 	amdgpu_vf_error_trans_all(adev);
+	adev->mp1_state = PP_MP1_STATE_NONE;
 	adev->in_gpu_reset = 0;
 	mutex_unlock(&adev->lock_reset);
 }

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

···
 	 * unfortunately we can't detect certain
 	 * hypervisors so just do this all the time.
 	 */
+	adev->mp1_state = PP_MP1_STATE_UNLOAD;
 	amdgpu_device_ip_suspend(adev);
+	adev->mp1_state = PP_MP1_STATE_NONE;
 }
 
 static int amdgpu_pmops_suspend(struct device *dev)