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ath9k: Fix chainmask selection for AR9462

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Force chain 1 to be used for CCK rates since the target power
table stored in EEPROM is too high to transmit with both chains.
This is needed to avoid regulatory violation.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2012-09-26 12:22:08 +05:30 • committed by John W. Linville
parent 8b4509f642
commit 365d2ebcab
2 changed files with 6 additions and 0 deletions
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2
drivers/net/wireless/ath/ath9k/ath9k.h
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@ -173,6 +173,8 @@ void ath_descdma_cleanup(struct ath_softc *sc, struct ath_descdma *dd,
#define ATH_AN_2_TID(_an, _tidno) (&(_an)->tid[(_tidno)])
#define IS_CCK_RATE(rate) ((rate >= 0x18) && (rate <= 0x1e))
#define ATH_TX_COMPLETE_POLL_INT 1000
enum ATH_AGGR_STATUS {

4
drivers/net/wireless/ath/ath9k/xmit.c
View file

@ -1820,10 +1820,14 @@ u8 ath_txchainmask_reduction(struct ath_softc *sc, u8 chainmask, u32 rate)
{
struct ath_hw *ah = sc->sc_ah;
struct ath9k_channel *curchan = ah->curchan;
if ((ah->caps.hw_caps & ATH9K_HW_CAP_APM) &&
(curchan->channelFlags & CHANNEL_5GHZ) &&
(chainmask == 0x7) && (rate < 0x90))
return 0x3;
else if (AR_SREV_9462(ah) && ath9k_hw_btcoex_is_enabled(ah) &&
IS_CCK_RATE(rate))
return 0x2;
else
return chainmask;
}