From 506a81e6ba1148a4435dec95651cd93874c2b7cf Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Thu, 28 Feb 2013 14:05:14 +0100 Subject: [PATCH] iwlwifi: mvm: don't read system time when modifying AP/GO MAC When modifying a MAC, we update its beacon system time which is taken as a base to calculate TBTT. The firmware doesn't use the new timestamp because the time is never used after the MAC and broadcast station were added, but it is safer to not rely on this and avoids the overhead of reading the register every time the MAC is updated. Reviewed-by: Emmanuel Grumbach Reviewed-by: Ilan Peer Signed-off-by: Johannes Berg --- drivers/net/wireless/iwlwifi/mvm/mac-ctxt.c | 25 +++++++++++++++------ drivers/net/wireless/iwlwifi/mvm/mvm.h | 2 ++ 2 files changed, 20 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/mac-ctxt.c b/drivers/net/wireless/iwlwifi/mvm/mac-ctxt.c index a993f6c7dac0..2779235daa35 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mac-ctxt.c +++ b/drivers/net/wireless/iwlwifi/mvm/mac-ctxt.c @@ -855,10 +855,10 @@ int iwl_mvm_mac_ctxt_beacon_changed(struct iwl_mvm *mvm, */ static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm, struct ieee80211_vif *vif, - struct iwl_mac_data_ap *ctxt_ap) + struct iwl_mac_data_ap *ctxt_ap, + bool add) { struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); - u32 curr_dev_time; ctxt_ap->bi = cpu_to_le32(vif->bss_conf.beacon_int); ctxt_ap->bi_reciprocal = @@ -870,10 +870,19 @@ static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm, vif->bss_conf.dtim_period)); ctxt_ap->mcast_qid = cpu_to_le32(vif->cab_queue); - curr_dev_time = iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG); - ctxt_ap->beacon_time = cpu_to_le32(curr_dev_time); - ctxt_ap->beacon_tsf = cpu_to_le64(curr_dev_time); + /* + * Only read the system time when the MAC is being added, when we + * just modify the MAC then we should keep the time -- the firmware + * can otherwise have a "jumping" TBTT. + */ + if (add) + mvmvif->ap_beacon_time = + iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG); + + ctxt_ap->beacon_time = cpu_to_le32(mvmvif->ap_beacon_time); + + ctxt_ap->beacon_tsf = 0; /* unused */ /* TODO: Assume that the beacon id == mac context id */ ctxt_ap->beacon_template = cpu_to_le32(mvmvif->id); @@ -894,7 +903,8 @@ static int iwl_mvm_mac_ctxt_cmd_ap(struct iwl_mvm *mvm, cmd.filter_flags |= cpu_to_le32(MAC_FILTER_IN_PROBE_REQUEST); /* Fill the data specific for ap mode */ - iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.ap); + iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.ap, + action == FW_CTXT_ACTION_ADD); return iwl_mvm_mac_ctxt_send_cmd(mvm, &cmd); } @@ -911,7 +921,8 @@ static int iwl_mvm_mac_ctxt_cmd_go(struct iwl_mvm *mvm, iwl_mvm_mac_ctxt_cmd_common(mvm, vif, &cmd, action); /* Fill the data specific for GO mode */ - iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.go.ap); + iwl_mvm_mac_ctxt_cmd_fill_ap(mvm, vif, &cmd.go.ap, + action == FW_CTXT_ACTION_ADD); cmd.go.ctwin = cpu_to_le32(vif->bss_conf.p2p_ctwindow); cmd.go.opp_ps_enabled = cpu_to_le32(!!vif->bss_conf.p2p_oppps); diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h index efe5da992897..234c5726d196 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h @@ -174,6 +174,8 @@ struct iwl_mvm_vif { bool uploaded; bool ap_active; + u32 ap_beacon_time; + enum iwl_tsf_id tsf_id; /* -- 2.20.1