diff options
Diffstat (limited to 'drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c')
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c index 7e0a5f364469..f1a3d41c8209 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_usb_core.c @@ -105,8 +105,78 @@ int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data, } EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb); +/* Trigger pre-TBTT event 8 ms before TBTT */ +#define PRE_TBTT_USEC 8000 +static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev) +{ + u64 time; + u32 tbtt; + + /* Get remaining TBTT in usec */ + tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); + tbtt *= 32; + + if (tbtt <= PRE_TBTT_USEC) { + queue_work(system_highpri_wq, &dev->pre_tbtt_work); + return; + } + + time = (tbtt - PRE_TBTT_USEC) * 1000ull; + hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); +} + +static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev) +{ + u32 tbtt, dw0, dw1; + u64 tsf, time; + + /* Get remaining TBTT in usec */ + tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); + tbtt *= 32; + + dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0); + dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1); + tsf = (u64)dw0 << 32 | dw1; + dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt); + + /* Convert beacon interval in TU (1024 usec) to nsec */ + time = ((1000000000ull * dev->beacon_int) >> 10); + + /* Adjust time to trigger hrtimer 8ms before TBTT */ + if (tbtt < PRE_TBTT_USEC) + time -= (PRE_TBTT_USEC - tbtt) * 1000ull; + else + time += (tbtt - PRE_TBTT_USEC) * 1000ull; + + hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); +} + +static void mt76x02u_pre_tbtt_work(struct work_struct *work) +{ + struct mt76x02_dev *dev = + container_of(work, struct mt76x02_dev, pre_tbtt_work); + + if (!dev->beacon_mask) + return; + mt76x02u_restart_pre_tbtt_timer(dev); +} + +static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer) +{ + struct mt76x02_dev *dev = + container_of(timer, struct mt76x02_dev, pre_tbtt_timer); + + queue_work(system_highpri_wq, &dev->pre_tbtt_work); + + return HRTIMER_NORESTART; +} + void mt76x02u_init_beacon_config(struct mt76x02_dev *dev) { + hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt; + INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work); + mt76x02_init_beacon_config(dev); } EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config); |