drm/amd/powerplay: Enable UVD powergating for SMU7

This patch enables detecting VCE/UVD PG features and fixes the
UVD powergate function.

Tested on a Tonga (by reading UVD tile/clk bits during playback/idle).
Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/smu7_clockpowergating.c

@@ -149,15 +149,21 @@ int smu7_powergate_uvd(struct pp_hwmgr *hwmgr, bool bgate)
 	if (bgate) {
 		cgs_set_clockgating_state(hwmgr->device,
 				AMD_IP_BLOCK_TYPE_UVD,
-				AMD_CG_STATE_GATE);
+				AMD_CG_STATE_UNGATE);
+		cgs_set_powergating_state(hwmgr->device,
+						AMD_IP_BLOCK_TYPE_UVD,
+						AMD_PG_STATE_GATE);
 		smu7_update_uvd_dpm(hwmgr, true);
 		smu7_powerdown_uvd(hwmgr);
 	} else {
 		smu7_powerup_uvd(hwmgr);
-		smu7_update_uvd_dpm(hwmgr, false);
-		cgs_set_clockgating_state(hwmgr->device,
+		cgs_set_powergating_state(hwmgr->device,
 						AMD_IP_BLOCK_TYPE_UVD,
 						AMD_CG_STATE_UNGATE);
+		cgs_set_clockgating_state(hwmgr->device,
+				AMD_IP_BLOCK_TYPE_UVD,
+				AMD_CG_STATE_GATE);
+		smu7_update_uvd_dpm(hwmgr, false);
 	}
 
 	return 0;

drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c

@@ -1352,6 +1352,8 @@ static void smu7_init_dpm_defaults(struct pp_hwmgr *hwmgr)
 	struct smu7_hwmgr *data = (struct smu7_hwmgr *)(hwmgr->backend);
 	struct phm_ppt_v1_information *table_info =
 			(struct phm_ppt_v1_information *)(hwmgr->pptable);
+	struct cgs_system_info sys_info = {0};
+	int result;
 
 	data->dll_default_on = false;
 	data->mclk_dpm0_activity_target = 0xa;
@@ -1439,6 +1441,18 @@ static void smu7_init_dpm_defaults(struct pp_hwmgr *hwmgr)
 	data->pcie_lane_performance.min = 16;
 	data->pcie_lane_power_saving.max = 0;
 	data->pcie_lane_power_saving.min = 16;
+
+	sys_info.size = sizeof(struct cgs_system_info);
+	sys_info.info_id = CGS_SYSTEM_INFO_PG_FLAGS;
+	result = cgs_query_system_info(hwmgr->device, &sys_info);
+	if (!result) {
+		if (sys_info.value & AMD_PG_SUPPORT_UVD)
+			phm_cap_set(hwmgr->platform_descriptor.platformCaps,
+				      PHM_PlatformCaps_UVDPowerGating);
+		if (sys_info.value & AMD_PG_SUPPORT_VCE)
+			phm_cap_set(hwmgr->platform_descriptor.platformCaps,
+				      PHM_PlatformCaps_VCEPowerGating);
+	}
 }
 
 /**