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ath9k: add a workaround for the tx ack time issue triggered by the timing handling cleanups

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in 2.4 ghz, calculating the ack timeout the way it is described in 802.11-2007 currently leads to tx timeouts
set it to a minimum of what the initvals set (64 usec) until we know what is causing this

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19156 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2010-01-15 23:12:21 +00:00
parent f3a35a3d8b
commit f0e79d4172
1 changed files with 14 additions and 0 deletions
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package/mac80211/patches/580-ath9k_ack_timeout_workaround.patch Normal file
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@ -0,0 +1,14 @@
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1229,6 +1229,11 @@ void ath9k_hw_init_global_settings(struc
/* As defined by IEEE 802.11-2007 17.3.8.6 */
slottime = ah->slottime + 3 * ah->coverage_class;
acktimeout = slottime + sifstime;
+
+ /* Workaround for a hw issue */
+ if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ)
+ acktimeout = max(64, acktimeout);
+
ath9k_hw_setslottime(ah, slottime);
ath9k_hw_set_ack_timeout(ah, acktimeout);
ath9k_hw_set_cts_timeout(ah, acktimeout);