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mt76: mt76x02: issue watchdog reset on MCU request timeout 

MCU request timeout usually indicates that the device is no longer responsive,
and it usually does not recover without a reset

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-02-24 23:16:45 +01:00
parent 90f42f2d76
commit 72e5d479b8
3 changed files with 21 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/mediatek/mt76/mt76x02.h
View File

@ -98,6 +98,7 @@ struct mt76x02_dev {
u32 tx_hang_reset;
u8 tx_hang_check;
u8 mcu_timeout;
struct mt76x02_calibration cal;

1
drivers/net/wireless/mediatek/mt76/mt76x02_mcu.c
View File

@ -61,6 +61,7 @@ int mt76x02_mcu_msg_send(struct mt76_dev *mdev, int cmd, const void *data,
"MCU message %d (seq %d) timed out\n", cmd,
seq);
ret = -ETIMEDOUT;
dev->mcu_timeout = 1;
break;
}

28
drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
View File

@ -494,18 +494,28 @@ static void mt76x02_watchdog_reset(struct mt76x02_dev *dev)
static void mt76x02_check_tx_hang(struct mt76x02_dev *dev)
{
if (mt76x02_tx_hang(dev)) {
if (++dev->tx_hang_check < MT_TX_HANG_TH)
return;
mt76x02_watchdog_reset(dev);
dev->tx_hang_reset++;
dev->tx_hang_check = 0;
memset(dev->mt76.tx_dma_idx, 0xff,
sizeof(dev->mt76.tx_dma_idx));
if (++dev->tx_hang_check >= MT_TX_HANG_TH)
goto restart;
} else {
dev->tx_hang_check = 0;
}
if (dev->mcu_timeout)
goto restart;
return;
restart:
mt76x02_watchdog_reset(dev);
mutex_lock(&dev->mt76.mmio.mcu.mutex);
dev->mcu_timeout = 0;
mutex_unlock(&dev->mt76.mmio.mcu.mutex);
dev->tx_hang_reset++;
dev->tx_hang_check = 0;
memset(dev->mt76.tx_dma_idx, 0xff,
sizeof(dev->mt76.tx_dma_idx));
}
void mt76x02_wdt_work(struct work_struct *work)