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mt76: mt76x02: fix beacon timer drift adjustment 

Check the count before incrementing it to match vendor code behavior.
This defers the adjustment by one more tick, which should improve accuracy

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-02-24 11:24:43 +01:00
parent a6982fcdc3
commit b3f09304ba
1 changed files with 7 additions and 7 deletions
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14
drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
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@ -79,24 +79,24 @@ mt76x02_resync_beacon_timer(struct mt76x02_dev *dev)
* Beacon timer drifts by 1us every tick, the timer is configured
* in 1/16 TU (64us) units.
*/
if (dev->tbtt_count < 62)
if (dev->tbtt_count < 63)
return;
if (dev->tbtt_count >= 64) {
dev->tbtt_count = 0;
return;
}
/*
* The updated beacon interval takes effect after two TBTT, because
* at this point the original interval has already been loaded into
* the next TBTT_TIMER value
*/
if (dev->tbtt_count == 62)
if (dev->tbtt_count == 63)
timer_val -= 1;
mt76_rmw_field(dev, MT_BEACON_TIME_CFG,
MT_BEACON_TIME_CFG_INTVAL, timer_val);
if (dev->tbtt_count >= 64) {
dev->tbtt_count = 0;
return;
}
}
static void mt76x02_pre_tbtt_tasklet(unsigned long arg)