drm/amd/powerplay: add GFX per cu powergating support through SMU/powerplay

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -267,7 +267,20 @@ static int pp_set_clockgating_state(void *handle,
 static int pp_set_powergating_state(void *handle,
 				    enum amd_powergating_state state)
 {
-	return 0;
+	struct pp_hwmgr  *hwmgr;
+
+	if (handle == NULL)
+		return -EINVAL;
+
+	hwmgr = ((struct pp_instance *)handle)->hwmgr;
+
+	if (hwmgr == NULL || hwmgr->hwmgr_func == NULL ||
+			hwmgr->hwmgr_func->enable_per_cu_power_gating == NULL)
+				return -EINVAL;
+
+	/* Enable/disable GFX per cu powergating through SMU */
+	return hwmgr->hwmgr_func->enable_per_cu_power_gating(hwmgr,
+			state == AMD_PG_STATE_GATE ? true : false);
 }
 
 static int pp_suspend(void *handle)

drivers/gpu/drm/amd/powerplay/inc/hwmgr.h

@@ -337,6 +337,7 @@ struct pp_hwmgr_func {
 	int (*set_pp_table)(struct pp_hwmgr *hwmgr, const char *buf, size_t size);
 	int (*force_clock_level)(struct pp_hwmgr *hwmgr, enum pp_clock_type type, int level);
 	int (*print_clock_levels)(struct pp_hwmgr *hwmgr, enum pp_clock_type type, char *buf);
+	int (*enable_per_cu_power_gating)(struct pp_hwmgr *hwmgr, bool enable);
 };
 
 struct pp_table_func {