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ath9k_hw: allow fast channel change when only CHANNEL_HT changes

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The CHANNEL_HT flag is insignificant for fast channel change conditions,
since it does not affect any important part of the hardware reset /
channel setup.
Scanning usually runs with HT disabled, so this change will slightly
improve scan time on many chipsets.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2013-11-18 20:14:44 +01:00 committed by John W. Linville
parent 09d8e315d9
commit af02efb32e
1 changed files with 4 additions and 3 deletions
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7
drivers/net/wireless/ath/ath9k/hw.c
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@ -1502,8 +1502,9 @@ static bool ath9k_hw_channel_change(struct ath_hw *ah,
int r;
if (pCap->hw_caps & ATH9K_HW_CAP_FCC_BAND_SWITCH) {
band_switch = IS_CHAN_5GHZ(ah->curchan) != IS_CHAN_5GHZ(chan);
mode_diff = (chan->channelFlags != ah->curchan->channelFlags);
u32 flags_diff = chan->channelFlags ^ ah->curchan->channelFlags;
band_switch = !!(flags_diff & CHANNEL_5GHZ);
mode_diff = !!(flags_diff & ~CHANNEL_HT);
}
for (qnum = 0; qnum < AR_NUM_QCU; qnum++) {
@ -1815,7 +1816,7 @@ static int ath9k_hw_do_fastcc(struct ath_hw *ah, struct ath9k_channel *chan)
* If cross-band fcc is not supoprted, bail out if channelFlags differ.
*/
if (!(pCap->hw_caps & ATH9K_HW_CAP_FCC_BAND_SWITCH) &&
chan->channelFlags != ah->curchan->channelFlags)
((chan->channelFlags ^ ah->curchan->channelFlags) & ~CHANNEL_HT))
goto fail;
if (!ath9k_hw_check_alive(ah))