[PATCH 11/11] drm/amdgpu: put the SMC into the proper state on reset/unload

[Alex Deucher]

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.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 27 ++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |  2 ++
 3 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index e661417ba9dd..121cc5544b2b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -993,6 +993,7 @@ struct amdgpu_device {
 	/* 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;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 4425ff06ecc4..127ed01ed8fd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2174,6 +2174,21 @@ static int amdgpu_device_ip_suspend_phase2(struct amdgpu_device *adev)
 			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;
@@ -3639,6 +3654,17 @@ static bool amdgpu_device_lock_adev(struct amdgpu_device *adev, bool trylock)
 
 	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);
@@ -3652,6 +3678,7 @@ static void amdgpu_device_unlock_adev(struct amdgpu_device *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);
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 4743801357c5..800d0ceb14b4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -1094,7 +1094,9 @@ amdgpu_pci_shutdown(struct pci_dev *pdev)
 	 * 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)
-- 
2.20.1