From 37e5bf6535a4d697fb9fa6f268a8354a612cbc00 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Sat, 12 Jun 2010 00:33:40 -0400 Subject: [PATCH] ath9k_hw: fix clock rate calculations for ANI The clock rate was assumed to be static but it actually changes depending on the mode of operation, correct this to help improve the calcuation of the listenTime for ANI. This change will help adjust ANI more accurately on different PHY thresholds. Signed-off-by: Luis R. Rodriguez Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/ani.c | 31 +++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/ani.c b/drivers/net/wireless/ath/ath9k/ani.c index 3da820ffc65e..e879055c058f 100644 --- a/drivers/net/wireless/ath/ath9k/ani.c +++ b/drivers/net/wireless/ath/ath9k/ani.c @@ -259,6 +259,27 @@ static void ath9k_hw_ani_lower_immunity(struct ath_hw *ah) } } +static u8 ath9k_hw_chan_2_clockrate_mhz(struct ath_hw *ah) +{ + struct ath9k_channel *chan = ah->curchan; + struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf; + u8 clockrate; /* in MHz */ + + if (!ah->curchan) /* should really check for CCK instead */ + clockrate = ATH9K_CLOCK_RATE_CCK; + else if (conf->channel->band == IEEE80211_BAND_2GHZ) + clockrate = ATH9K_CLOCK_RATE_2GHZ_OFDM; + else if (IS_CHAN_A_FAST_CLOCK(ah, chan)) + clockrate = ATH9K_CLOCK_FAST_RATE_5GHZ_OFDM; + else + clockrate = ATH9K_CLOCK_RATE_5GHZ_OFDM; + + if (conf_is_ht40(conf)) + return clockrate * 2; + + return clockrate * 2; +} + static int32_t ath9k_hw_ani_get_listen_time(struct ath_hw *ah) { struct ar5416AniState *aniState; @@ -278,7 +299,15 @@ static int32_t ath9k_hw_ani_get_listen_time(struct ath_hw *ah) int32_t ccdelta = cycleCount - aniState->cycleCount; int32_t rfdelta = rxFrameCount - aniState->rxFrameCount; int32_t tfdelta = txFrameCount - aniState->txFrameCount; - listenTime = (ccdelta - rfdelta - tfdelta) / 44000; + int32_t clock_rate = ath9k_hw_chan_2_clockrate_mhz(ah) * 1000;; + + /* + * convert HW counter values to ms using mode + * specifix clock rate + */ + clock_rate = ath9k_hw_chan_2_clockrate_mhz(ah) * 1000;; + + listenTime = (ccdelta - rfdelta - tfdelta) / clock_rate; } aniState->cycleCount = cycleCount; aniState->txFrameCount = txFrameCount; -- 2.39.5