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ath9k: Add a few comments about mibevents

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Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Luis R. Rodriguez 2008-09-22 01:14:02 -07:00 committed by John W. Linville
parent 4dfe51e100
commit e6c948e8b8
1 changed files with 16 additions and 2 deletions
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18
drivers/net/wireless/ath9k/hw.c
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@ -2526,6 +2526,11 @@ static void ath9k_ani_reset(struct ath_hal *ah)
}
}
/*
* Process a MIB interrupt. We may potentially be invoked because
* any of the MIB counters overflow/trigger so don't assume we're
* here because a PHY error counter triggered.
*/
void ath9k_hw_procmibevent(struct ath_hal *ah,
const struct ath9k_node_stats *stats)
{
@ -2533,18 +2538,20 @@ void ath9k_hw_procmibevent(struct ath_hal *ah,
u32 phyCnt1, phyCnt2;
DPRINTF(ah->ah_sc, ATH_DBG_ANI, "Processing Mib Intr\n");
/* Reset these counters regardless */
REG_WRITE(ah, AR_FILT_OFDM, 0);
REG_WRITE(ah, AR_FILT_CCK, 0);
if (!(REG_READ(ah, AR_SLP_MIB_CTRL) & AR_SLP_MIB_PENDING))
REG_WRITE(ah, AR_SLP_MIB_CTRL, AR_SLP_MIB_CLEAR);
/* Clear the mib counters and save them in the stats */
ath9k_hw_update_mibstats(ah, &ahp->ah_mibStats);
ahp->ah_stats.ast_nodestats = *stats;
if (!DO_ANI(ah))
return;
/* NB: these are not reset-on-read */
phyCnt1 = REG_READ(ah, AR_PHY_ERR_1);
phyCnt2 = REG_READ(ah, AR_PHY_ERR_2);
if (((phyCnt1 & AR_MIBCNT_INTRMASK) == AR_MIBCNT_INTRMASK) ||
@ -2552,6 +2559,7 @@ void ath9k_hw_procmibevent(struct ath_hal *ah,
struct ar5416AniState *aniState = ahp->ah_curani;
u32 ofdmPhyErrCnt, cckPhyErrCnt;
/* NB: only use ast_ani_*errs with AH_PRIVATE_DIAG */
ofdmPhyErrCnt = phyCnt1 - aniState->ofdmPhyErrBase;
ahp->ah_stats.ast_ani_ofdmerrs +=
ofdmPhyErrCnt - aniState->ofdmPhyErrCount;
@ -2562,11 +2570,17 @@ void ath9k_hw_procmibevent(struct ath_hal *ah,
cckPhyErrCnt - aniState->cckPhyErrCount;
aniState->cckPhyErrCount = cckPhyErrCnt;
/*
* NB: figure out which counter triggered. If both
* trigger we'll only deal with one as the processing
* clobbers the error counter so the trigger threshold
* check will never be true.
*/
if (aniState->ofdmPhyErrCount > aniState->ofdmTrigHigh)
ath9k_hw_ani_ofdm_err_trigger(ah);
if (aniState->cckPhyErrCount > aniState->cckTrigHigh)
ath9k_hw_ani_cck_err_trigger(ah);
/* NB: always restart to insure the h/w counters are reset */
ath9k_ani_restart(ah);
}
}