drm/amdgpu/swsmu: implement voltage metrics for RENOIR

Grab the data from the SMU metrics table.
Reviewed-by: Evan Quan <evan.quan@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/smu12/renoir_ppt.c

@@ -616,6 +616,27 @@ static int renoir_get_current_activity_percent(struct smu_context *smu,
 	return 0;
 }
 
+static int renoir_get_vddc(struct smu_context *smu, uint32_t *value,
+			   unsigned int index)
+{
+	int ret = 0;
+	SmuMetrics_t metrics;
+
+	if (index >= 2)
+		return -EINVAL;
+
+	if (!value)
+		return -EINVAL;
+
+	ret = smu_cmn_get_metrics_table(smu, &metrics, false);
+	if (ret)
+		return ret;
+
+	*value = metrics.Voltage[index];
+
+	return 0;
+}
+
 /**
  * This interface get dpm clock table for dc
  */
@@ -952,6 +973,14 @@ static int renoir_read_sensor(struct smu_context *smu,
 		*(uint32_t *)data *= 100;
 		*size = 4;
 		break;
+	case AMDGPU_PP_SENSOR_VDDGFX:
+		ret = renoir_get_vddc(smu, (uint32_t *)data, 0);
+		*size = 4;
+		break;
+	case AMDGPU_PP_SENSOR_VDDNB:
+		ret = renoir_get_vddc(smu, (uint32_t *)data, 1);
+		*size = 4;
+		break;
 	default:
 		ret = -EOPNOTSUPP;
 		break;