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net: stmmac: Power up SERDES after the PHY link

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The Tegra MGBE ethernet controller requires that the SERDES link is
powered-up after the PHY link is up, otherwise the link fails to
become ready following a resume from suspend. Add a variable to indicate
that the SERDES link must be powered-up after the PHY link.

Signed-off-by: Revanth Kumar Uppala <ruppala@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Revanth Kumar Uppala 2022-12-01 15:58:43 +00:00 committed by David S. Miller
parent 32163491c0
commit a46e901012
2 changed files with 6 additions and 2 deletions
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7
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -988,6 +988,9 @@ static void stmmac_mac_link_up(struct phylink_config *config,
struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
u32 old_ctrl, ctrl;
if (priv->plat->serdes_up_after_phy_linkup && priv->plat->serdes_powerup)
priv->plat->serdes_powerup(priv->dev, priv->plat->bsp_priv);
old_ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
ctrl = old_ctrl & ~priv->hw->link.speed_mask;
@ -3809,7 +3812,7 @@ static int __stmmac_open(struct net_device *dev,
stmmac_reset_queues_param(priv);
if (priv->plat->serdes_powerup) {
if (!priv->plat->serdes_up_after_phy_linkup && 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",
@ -7518,7 +7521,7 @@ int stmmac_resume(struct device *dev)
stmmac_mdio_reset(priv->mii);
}
if (priv->plat->serdes_powerup) {
if (!priv->plat->serdes_up_after_phy_linkup && priv->plat->serdes_powerup) {
ret = priv->plat->serdes_powerup(ndev,
priv->plat->bsp_priv);

1
include/linux/stmmac.h
View File

@ -271,5 +271,6 @@ struct plat_stmmacenet_data {
int msi_tx_base_vec;
bool use_phy_wol;
bool sph_disable;
bool serdes_up_after_phy_linkup;
};
#endif