iwlwifi: mvm: disable powersave in low-latency

While an interface is in low-latency mode, for now powersave
should be disabled for it, so take low-latency into account
in the powersave code and force powersave recalculation when
low-latency mode changes.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/power.c

@@ -312,7 +312,8 @@ static void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm,
 	    mvmvif->dbgfs_pm.disable_power_off)
 		cmd->flags &= cpu_to_le16(~POWER_FLAGS_POWER_SAVE_ENA_MSK);
 #endif
-	if (!vif->bss_conf.ps || mvmvif->pm_prevented)
+	if (!vif->bss_conf.ps || mvmvif->pm_prevented ||
+	    iwl_mvm_vif_low_latency(mvmvif))
 		return;
 
 	cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK);

drivers/net/wireless/iwlwifi/mvm/utils.c

@@ -541,10 +541,14 @@ int iwl_mvm_update_low_latency(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 			       bool value)
 {
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+	int res;
 
 	lockdep_assert_held(&mvm->mutex);
 
 	mvmvif->low_latency = value;
 
-	return iwl_mvm_update_quotas(mvm, NULL);
+	res = iwl_mvm_update_quotas(mvm, NULL);
+	if (res)
+		return res;
+	return iwl_mvm_power_update_mode(mvm, vif);
 }