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ath9k: reduce baseband hang detection false positive rate

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Check if the baseband state remains stable, and add a small delay
between register reads.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2014-02-24 22:26:05 +01:00 committed by John W. Linville
parent 558ff225de
commit d31a36a6d8
1 changed files with 7 additions and 1 deletions
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8
drivers/net/wireless/ath/ath9k/hw.c
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@ -1534,7 +1534,7 @@ EXPORT_SYMBOL(ath9k_hw_check_nav);
bool ath9k_hw_check_alive(struct ath_hw *ah)
{
int count = 50;
u32 reg;
u32 reg, last_val;
if (AR_SREV_9300(ah))
return !ath9k_hw_detect_mac_hang(ah);
@ -1542,9 +1542,13 @@ bool ath9k_hw_check_alive(struct ath_hw *ah)
if (AR_SREV_9285_12_OR_LATER(ah))
return true;
last_val = REG_READ(ah, AR_OBS_BUS_1);
do {
reg = REG_READ(ah, AR_OBS_BUS_1);
if (reg != last_val)
return true;
last_val = reg;
if ((reg & 0x7E7FFFEF) == 0x00702400)
continue;
@ -1556,6 +1560,8 @@ bool ath9k_hw_check_alive(struct ath_hw *ah)
default:
return true;
}
udelay(1);
} while (count-- > 0);
return false;