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ath9k: Optimize LNA check

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The documentation for antenna diversity says:

"The decision of diversity is done at 802.11 preamble. So, for
11G/11B, for every MAC packet hardware will do a decision. But in
11N with aggregation, the decision is made only at the preamble and
all other MPDUs will use the same LNA as the first MPDU."

Make use of rs_firstaggr to avoid needlessly scanning for LNA
changes.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2013-08-14 21:15:56 +05:30 committed by John W. Linville
parent 009af8fb69
commit c3124df796
1 changed files with 47 additions and 30 deletions
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77
drivers/net/wireless/ath/ath9k/recv.c
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@ -1238,6 +1238,52 @@ static void ath9k_rx_skb_postprocess(struct ath_common *common,
rxs->flag &= ~RX_FLAG_DECRYPTED;
}
/*
* Run the LNA combining algorithm only in these cases:
*
* Standalone WLAN cards with both LNA/Antenna diversity
* enabled in the EEPROM.
*
* WLAN+BT cards which are in the supported card list
* in ath_pci_id_table and the user has loaded the
* driver with "bt_ant_diversity" set to true.
*/
static void ath9k_antenna_check(struct ath_softc *sc,
struct ath_rx_status *rs)
{
struct ath_hw *ah = sc->sc_ah;
struct ath9k_hw_capabilities *pCap = &ah->caps;
struct ath_common *common = ath9k_hw_common(ah);
if (!(ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB))
return;
/*
* All MPDUs in an aggregate will use the same LNA
* as the first MPDU.
*/
if (rs->rs_isaggr && !rs->rs_firstaggr)
return;
/*
* Change the default rx antenna if rx diversity
* chooses the other antenna 3 times in a row.
*/
if (sc->rx.defant != rs->rs_antenna) {
if (++sc->rx.rxotherant >= 3)
ath_setdefantenna(sc, rs->rs_antenna);
} else {
sc->rx.rxotherant = 0;
}
if (pCap->hw_caps & ATH9K_HW_CAP_BT_ANT_DIV) {
if (common->bt_ant_diversity)
ath_ant_comb_scan(sc, rs);
} else {
ath_ant_comb_scan(sc, rs);
}
}
static void ath9k_apply_ampdu_details(struct ath_softc *sc,
struct ath_rx_status *rs, struct ieee80211_rx_status *rxs)
{
@ -1262,7 +1308,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
struct ieee80211_rx_status *rxs;
struct ath_hw *ah = sc->sc_ah;
struct ath9k_hw_capabilities *pCap = &ah->caps;
struct ath_common *common = ath9k_hw_common(ah);
struct ieee80211_hw *hw = sc->hw;
int retval;
@ -1398,35 +1443,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
ath_rx_ps(sc, skb, rs.is_mybeacon);
spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
/*
* Run the LNA combining algorithm only in these cases:
*
* Standalone WLAN cards with both LNA/Antenna diversity
* enabled in the EEPROM.
*
* WLAN+BT cards which are in the supported card list
* in ath_pci_id_table and the user has loaded the
* driver with "bt_ant_diversity" set to true.
*/
if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) {
/*
* Change the default rx antenna if rx diversity
* chooses the other antenna 3 times in a row.
*/
if (sc->rx.defant != rs.rs_antenna) {
if (++sc->rx.rxotherant >= 3)
ath_setdefantenna(sc, rs.rs_antenna);
} else {
sc->rx.rxotherant = 0;
}
if (pCap->hw_caps & ATH9K_HW_CAP_BT_ANT_DIV) {
if (common->bt_ant_diversity)
ath_ant_comb_scan(sc, &rs);
} else {
ath_ant_comb_scan(sc, &rs);
}
}
ath9k_antenna_check(sc, &rs);
ath9k_apply_ampdu_details(sc, &rs, rxs);