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--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1005,16 +1005,26 @@ void ath9k_hw_init_global_settings(struc
if (IS_CHAN_HALF_RATE(chan)) {
eifs = 175;
- rx_lat *= 2;
+
+ if (!AR_SREV_9300_20_OR_LATER(ah))
+ rx_lat = 10;
+ else
+ rx_lat *= 2;
+
tx_lat *= 2;
if (IS_CHAN_A_FAST_CLOCK(ah, chan))
- tx_lat += 11;
+ tx_lat += 11;
slottime = 13;
sifstime = 32;
} else if (IS_CHAN_QUARTER_RATE(chan)) {
eifs = 340;
- rx_lat = (rx_lat * 4) - 1;
+
+ if (!AR_SREV_9300_20_OR_LATER(ah))
+ rx_lat = 20;
+ else
+ rx_lat = (rx_lat * 4) - 1;
+
tx_lat *= 4;
if (IS_CHAN_A_FAST_CLOCK(ah, chan))
tx_lat += 22;
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