iwlwifi: mvm: store latest power command for debugfs read

Instead of re-building the power command upon debugfs read,
store the latest command sent to the firmware.
This reduces the code complexity by reducing the number of
entries in the power code.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Alexander Bondar <alexander.bondar@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/mvm.h

@@ -347,6 +347,7 @@ struct iwl_mvm_vif {
 	struct dentry *dbgfs_slink;
 	struct iwl_dbgfs_pm dbgfs_pm;
 	struct iwl_dbgfs_bf dbgfs_bf;
+	struct iwl_mac_power_cmd mac_pwr_cmd;
 #endif
 
 	enum ieee80211_smps_mode smps_requests[NUM_IWL_MVM_SMPS_REQ];

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

@@ -431,6 +431,9 @@ static int _iwl_mvm_power_mac_update_mode(struct iwl_mvm *mvm,
 
 	iwl_mvm_power_build_cmd(mvm, vif, &cmd);
 	iwl_mvm_power_log(mvm, &cmd);
+#ifdef CONFIG_IWLWIFI_DEBUGFS
+	memcpy(&iwl_mvm_vif_from_mac80211(vif)->mac_pwr_cmd, &cmd, sizeof(cmd));
+#endif
 
 	return iwl_mvm_send_cmd_pdu(mvm, MAC_PM_POWER_TABLE, CMD_SYNC,
 				    sizeof(cmd), &cmd);
@@ -475,6 +478,7 @@ static int iwl_mvm_power_mac_disable(struct iwl_mvm *mvm,
 	if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_DISABLE_POWER_OFF &&
 	    mvmvif->dbgfs_pm.disable_power_off)
 		cmd.flags &= cpu_to_le16(~POWER_FLAGS_POWER_SAVE_ENA_MSK);
+	memcpy(&mvmvif->mac_pwr_cmd, &cmd, sizeof(cmd));
 #endif
 	iwl_mvm_power_log(mvm, &cmd);
 
@@ -615,10 +619,13 @@ static int iwl_mvm_power_mac_dbgfs_read(struct iwl_mvm *mvm,
 					struct ieee80211_vif *vif, char *buf,
 					int bufsz)
 {
+	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 	struct iwl_mac_power_cmd cmd = {};
 	int pos = 0;
 
-	iwl_mvm_power_build_cmd(mvm, vif, &cmd);
+	mutex_lock(&mvm->mutex);
+	memcpy(&cmd, &mvmvif->mac_pwr_cmd, sizeof(cmd));
+	mutex_unlock(&mvm->mutex);
 
 	if (!(mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_DEVICE_PS_CMD))
 		pos += scnprintf(buf+pos, bufsz-pos, "disable_power_off = %d\n",
@@ -807,6 +814,9 @@ int iwl_mvm_update_d0i3_power_mode(struct iwl_mvm *mvm,
 		cmd.skip_dtim_periods = 300 / dtimper_msec;
 	}
 	iwl_mvm_power_log(mvm, &cmd);
+#ifdef CONFIG_IWLWIFI_DEBUGFS
+	memcpy(&mvmvif->mac_pwr_cmd, &cmd, sizeof(cmd));
+#endif
 	ret = iwl_mvm_send_cmd_pdu(mvm, MAC_PM_POWER_TABLE, flags,
 				   sizeof(cmd), &cmd);
 	if (ret)