wifi: mt76: mt7915: reset the device after MCU timeout

On MT7915, MCU hangs do not trigger watchdog interrupts, so they can only
be detected through MCU message timeouts. Ensure that the hardware gets
restarted when that happens in order to prevent a permanent stuck state.

Link: https://patch.msgid.link/20240827093011.18621-15-nbd@nbd.name
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 0cde1b3c7d41636f9f8073b81a2c36de8fda563f..81375b5d0021a47da83b7bb90893fa8dd0bb1989 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -157,12 +157,21 @@ static int
 mt7915_mcu_parse_response(struct mt76_dev *mdev, int cmd,
                          struct sk_buff *skb, int seq)
 {
+       struct mt7915_dev *dev = container_of(mdev, struct mt7915_dev, mt76);
        struct mt76_connac2_mcu_rxd *rxd;
        int ret = 0;
 
        if (!skb) {
                dev_err(mdev->dev, "Message %08x (seq %d) timeout\n",
                        cmd, seq);
+
+               if (!test_and_set_bit(MT76_MCU_RESET, &dev->mphy.state)) {
+                       dev->recovery.restart = true;
+                       wake_up(&dev->mt76.mcu.wait);
+                       queue_work(dev->mt76.wq, &dev->reset_work);
+                       wake_up(&dev->reset_wait);
+               }
+
                return -ETIMEDOUT;
        }