drm/amd/powerplay: Disable Spread Spectrum on DPM 0 on baffin as SPLL Shut Down feature is enabled.

Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
Acked-by: Flora Cui <Flora.Cui@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c

@@ -1248,6 +1248,9 @@ static int polaris10_populate_all_graphic_levels(struct pp_hwmgr *hwmgr)
 		if (i > 1)
 			levels[i].DeepSleepDivId = 0;
 	}
+	if (phm_cap_enabled(hwmgr->platform_descriptor.platformCaps,
+					PHM_PlatformCaps_SPLLShutdownSupport))
+		data->smc_state_table.GraphicsLevel[0].SclkSetting.SSc_En = 0;
 
 	data->smc_state_table.GraphicsLevel[0].EnabledForActivity = 1;
 	data->smc_state_table.GraphicsDpmLevelCount =
@@ -2602,6 +2605,9 @@ int polaris10_set_features_platform_caps(struct pp_hwmgr *hwmgr)
 	phm_cap_unset(hwmgr->platform_descriptor.platformCaps,
 						PHM_PlatformCaps_TCPRamping);
 
+	if (hwmgr->chip_id == CHIP_POLARIS11)
+		phm_cap_set(hwmgr->platform_descriptor.platformCaps,
+					PHM_PlatformCaps_SPLLShutdownSupport);
 	return 0;
 }
 

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

@@ -211,6 +211,7 @@ enum phm_platform_caps {
 	PHM_PlatformCaps_ClockStretcher,
 	PHM_PlatformCaps_TablelessHardwareInterface,
 	PHM_PlatformCaps_EnableDriverEVV,
+	PHM_PlatformCaps_SPLLShutdownSupport,
 	PHM_PlatformCaps_Max
 };