ath9k_hw: allow fast channel change when only CHANNEL_HT changes

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>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 02eff2a8a280..fe3537f6ec58 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -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))