drm/amdgpu/powerplay: add function point in hwmgr_funcs for program display gap

BugLink: http://bugs.launchpad.net/bugs/1546572

Displaygap support is required for proper mclk switching.
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit e8c7de5b)
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

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

@@ -276,7 +276,6 @@ struct pp_hwmgr_func {
 
 	int (*get_pp_table_entry)(struct pp_hwmgr *hwmgr,
 			    unsigned long, struct pp_power_state *);
-
 	int (*get_num_of_pp_table_entries)(struct pp_hwmgr *hwmgr);
 	int (*powerdown_uvd)(struct pp_hwmgr *hwmgr);
 	int (*powergate_vce)(struct pp_hwmgr *hwmgr, bool bgate);
@@ -288,6 +287,8 @@ struct pp_hwmgr_func {
 	void (*print_current_perforce_level)(struct pp_hwmgr *hwmgr,
 							struct seq_file *m);
 	int (*enable_clock_power_gating)(struct pp_hwmgr *hwmgr);
+	int (*notify_smc_display_config_after_ps_adjustment)(struct pp_hwmgr *hwmgr);
+	int (*display_config_changed)(struct pp_hwmgr *hwmgr);
 };
 
 struct pp_table_func {
@@ -544,6 +545,7 @@ struct pp_hwmgr {
 	struct phm_runtime_table_header enable_dynamic_state_management;
 	struct phm_runtime_table_header set_power_state;
 	struct phm_runtime_table_header enable_clock_power_gatings;
+	struct phm_runtime_table_header display_configuration_changed;
 	const struct pp_hwmgr_func *hwmgr_func;
 	const struct pp_table_func *pptable_func;
 	struct pp_power_state    *ps;