drm/amd/powerplay: retrieve the enabled feature mask from cache

This is why those feature mask members designed for. And this
can reduce the SMU workload.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/amdgpu_smu.c

@@ -1319,7 +1319,7 @@ static int smu_hw_init(void *handle)
 
 static int smu_stop_dpms(struct smu_context *smu)
 {
-	return smu_send_smc_msg(smu, SMU_MSG_DisableAllSmuFeatures);
+	return smu_system_features_control(smu, false);
 }
 
 static int smu_hw_fini(void *handle)

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -835,11 +835,13 @@ int smu_v11_0_get_enabled_mask(struct smu_context *smu,
 				      uint32_t *feature_mask, uint32_t num)
 {
 	uint32_t feature_mask_high = 0, feature_mask_low = 0;
+	struct smu_feature *feature = &smu->smu_feature;
 	int ret = 0;
 
 	if (!feature_mask || num < 2)
 		return -EINVAL;
 
+	if (bitmap_empty(feature->enabled, feature->feature_num)) {
 		ret = smu_send_smc_msg(smu, SMU_MSG_GetEnabledSmuFeaturesHigh);
 		if (ret)
 			return ret;
@@ -856,6 +858,10 @@ int smu_v11_0_get_enabled_mask(struct smu_context *smu,
 
 		feature_mask[0] = feature_mask_low;
 		feature_mask[1] = feature_mask_high;
+	} else {
+		bitmap_copy((unsigned long *)feature_mask, feature->enabled,
+			     feature->feature_num);
+	}
 
 	return ret;
 }
@@ -867,13 +873,12 @@ int smu_v11_0_system_features_control(struct smu_context *smu,
 	uint32_t feature_mask[2];
 	int ret = 0;
 
-	if (smu->pm_enabled) {
 	ret = smu_send_smc_msg(smu, (en ? SMU_MSG_EnableAllSmuFeatures :
 				     SMU_MSG_DisableAllSmuFeatures));
 	if (ret)
 		return ret;
-	}
 
+	if (en) {
 		ret = smu_feature_get_enabled_mask(smu, feature_mask, 2);
 		if (ret)
 			return ret;
@@ -882,6 +887,10 @@ int smu_v11_0_system_features_control(struct smu_context *smu,
 			    feature->feature_num);
 		bitmap_copy(feature->supported, (unsigned long *)&feature_mask,
 			    feature->feature_num);
+	} else {
+		bitmap_zero(feature->enabled, feature->feature_num);
+		bitmap_zero(feature->supported, feature->feature_num);
+	}
 
 	return ret;
 }