Hi!
The issue is related with serdes which impacts clock. There is serdes in ADLink I-Pi SMARC board ethernet controller. Please refer to commit b9663b7ca6ff78 ("net: stmmac: Enable SERDES power up/down sequence") for detial. When issue is reproduced, DMA engine clock is not ready because serdes is not powered up.
I don't believe you got the error handling right.
index 27b7bb64a028..41e71a26b1ad 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -2907,6 +2907,15 @@ static int stmmac_open(struct net_device *dev) goto init_error; }
- if (priv->plat->serdes_powerup) {
ret = priv->plat->serdes_powerup(dev, priv->plat->bsp_priv);if (ret < 0) {netdev_err(priv->dev, "%s: Serdes powerup failed\n",__func__);goto init_error;}- }
Ok, so serdes is powered up here.
ret = stmmac_hw_setup(dev, true); if (ret < 0) { netdev_err(priv->dev, "%s: Hw setup failed\n",
But this goes to init_error, and exits w/o powering serdes down. Error handling needs to be fixed AFAICT.
Best regards, Pavel -- echo 'DENX Software Engineering GmbH, Managing Director: Wolfgang Denk' echo 'HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany'