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mt76: measure the time between mt76x02_edcca_check runs

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Based on system load and time needed by other calibration runs, the time
between dev->mac_work runs can vary quite a bit.
Calculate busy time based on the actual time difference in order to avoid
potentially over-estimating busy time, which could lead to unnecessary tx
blocking.

Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Felix Fietkau
2019-02-03 14:46:59 +01:00
parent 4e8766a59c
commit e301f2349a
2 changed files with 10 additions and 2 deletions
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mt76x02_mac.c
+9 -2
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@@ -923,6 +923,7 @@ void mt76x02_edcca_init(struct mt76x02_dev *dev, bool enable)
/* clear previous CCA timer value */
mt76_rr(dev, MT_ED_CCA_TIMER);
dev->ed_time = ktime_get_boottime();
}
EXPORT_SYMBOL_GPL(mt76x02_edcca_init);
@@ -930,10 +931,16 @@ EXPORT_SYMBOL_GPL(mt76x02_edcca_init);
#define MT_EDCCA_BLOCK_TH 2
static void mt76x02_edcca_check(struct mt76x02_dev *dev)
{
u32 val, busy;
ktime_t cur_time;
u32 active, val, busy;
cur_time = ktime_get_boottime();
val = mt76_rr(dev, MT_ED_CCA_TIMER);
busy = (val * 100) / jiffies_to_usecs(MT_MAC_WORK_INTERVAL);
active = ktime_to_us(ktime_sub(cur_time, dev->ed_time));
dev->ed_time = cur_time;
busy = (val * 100) / active;
busy = min_t(u32, busy, 100);
if (busy > MT_EDCCA_TH) {