[PATCH] drm/amd/pm: Revert state if force level fails

[Lijo Lazar]

Before forcing level, CG/PG is disabled or enabled depending on the new
level. However if the force level operation fails, CG/PG state remains
modified. Revert the state change on failure. Also, move invalid
operation checks to the beginning before any logic that could change SOC
state.

Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
---
 drivers/gpu/drm/amd/pm/amdgpu_dpm.c | 58 +++++++++++++++++------------
 1 file changed, 35 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
index 4d90e3f0bd17..6a9e26905edf 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -987,6 +987,24 @@ enum amd_dpm_forced_level amdgpu_dpm_get_performance_level(struct amdgpu_device
 	return level;
 }
 
+static void amdgpu_dpm_enter_umd_state(struct amdgpu_device *adev)
+{
+	/* enter UMD Pstate */
+	amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_GFX,
+					       AMD_PG_STATE_UNGATE);
+	amdgpu_device_ip_set_clockgating_state(adev, AMD_IP_BLOCK_TYPE_GFX,
+					       AMD_CG_STATE_UNGATE);
+}
+
+static void amdgpu_dpm_exit_umd_state(struct amdgpu_device *adev)
+{
+	/* exit UMD Pstate */
+	amdgpu_device_ip_set_clockgating_state(adev, AMD_IP_BLOCK_TYPE_GFX,
+					       AMD_CG_STATE_GATE);
+	amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_GFX,
+					       AMD_PG_STATE_GATE);
+}
+
 int amdgpu_dpm_force_performance_level(struct amdgpu_device *adev,
 				       enum amd_dpm_forced_level level)
 {
@@ -1007,6 +1025,10 @@ int amdgpu_dpm_force_performance_level(struct amdgpu_device *adev,
 	if (current_level == level)
 		return 0;
 
+	if (!(current_level & profile_mode_mask) &&
+	    (level == AMD_DPM_FORCED_LEVEL_PROFILE_EXIT))
+		return -EINVAL;
+
 	if (adev->asic_type == CHIP_RAVEN) {
 		if (!(adev->apu_flags & AMD_APU_IS_RAVEN2)) {
 			if (current_level != AMD_DPM_FORCED_LEVEL_MANUAL &&
@@ -1018,35 +1040,25 @@ int amdgpu_dpm_force_performance_level(struct amdgpu_device *adev,
 		}
 	}
 
-	if (!(current_level & profile_mode_mask) &&
-	    (level == AMD_DPM_FORCED_LEVEL_PROFILE_EXIT))
-		return -EINVAL;
-
-	if (!(current_level & profile_mode_mask) &&
-	      (level & profile_mode_mask)) {
-		/* enter UMD Pstate */
-		amdgpu_device_ip_set_powergating_state(adev,
-						       AMD_IP_BLOCK_TYPE_GFX,
-						       AMD_PG_STATE_UNGATE);
-		amdgpu_device_ip_set_clockgating_state(adev,
-						       AMD_IP_BLOCK_TYPE_GFX,
-						       AMD_CG_STATE_UNGATE);
-	} else if ((current_level & profile_mode_mask) &&
-		    !(level & profile_mode_mask)) {
-		/* exit UMD Pstate */
-		amdgpu_device_ip_set_clockgating_state(adev,
-						       AMD_IP_BLOCK_TYPE_GFX,
-						       AMD_CG_STATE_GATE);
-		amdgpu_device_ip_set_powergating_state(adev,
-						       AMD_IP_BLOCK_TYPE_GFX,
-						       AMD_PG_STATE_GATE);
-	}
+	if (!(current_level & profile_mode_mask) && (level & profile_mode_mask))
+		amdgpu_dpm_enter_umd_state(adev);
+	else if ((current_level & profile_mode_mask) &&
+		 !(level & profile_mode_mask))
+		amdgpu_dpm_exit_umd_state(adev);
 
 	mutex_lock(&adev->pm.mutex);
 
 	if (pp_funcs->force_performance_level(adev->powerplay.pp_handle,
 					      level)) {
 		mutex_unlock(&adev->pm.mutex);
+		/* If new level failed, retain the umd state as before */
+		if (!(current_level & profile_mode_mask) &&
+		    (level & profile_mode_mask))
+			amdgpu_dpm_exit_umd_state(adev);
+		else if ((current_level & profile_mode_mask) &&
+			 !(level & profile_mode_mask))
+			amdgpu_dpm_enter_umd_state(adev);
+
 		return -EINVAL;
 	}
 
-- 
2.25.1