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ath9k: add a workaround for ack timeout issues

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Adding support for setting the coverage class in some cases broke
association and data transfer, as it overwrote the initial ACK timeout
value from the initvals with a smaller value.
I don't know why the new value works in 5 GHz (matches the initval
there), but not in 2.4 GHz (initvals use 64us here), so until the
problem is fully understood, the value should be increased again.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2010-02-11 18:07:19 +01:00 committed by John W. Linville
parent 4cad6c7c38
commit 42c4568a4a
1 changed files with 11 additions and 0 deletions
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11
drivers/net/wireless/ath/ath9k/hw.c
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@ -1217,6 +1217,17 @@ void ath9k_hw_init_global_settings(struct ath_hw *ah)
/* As defined by IEEE 802.11-2007 17.3.8.6 */
slottime = ah->slottime + 3 * ah->coverage_class;
acktimeout = slottime + sifstime;
/*
* Workaround for early ACK timeouts, add an offset to match the
* initval's 64us ack timeout value.
* This was initially only meant to work around an issue with delayed
* BA frames in some implementations, but it has been found to fix ACK
* timeout issues in other cases as well.
*/
if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ)
acktimeout += 64 - sifstime - ah->slottime;
ath9k_hw_setslottime(ah, slottime);
ath9k_hw_set_ack_timeout(ah, acktimeout);
ath9k_hw_set_cts_timeout(ah, acktimeout);