From 8fbc10b995a506e173f1080dfa2764f232a65e02 Mon Sep 17 00:00:00 2001 From: Michael Sit Wei Hong Date: Thu, 6 Apr 2023 10:45:41 +0800 Subject: net: stmmac: check fwnode for phy device before scanning for phy Some DT devices already have phy device configured in the DT/ACPI. Current implementation scans for a phy unconditionally even though there is a phy listed in the DT/ACPI and already attached. We should check the fwnode if there is any phy device listed in fwnode and decide whether to scan for a phy to attach to. Fixes: fe2cfbc96803 ("net: stmmac: check if MAC needs to attach to a PHY") Reported-by: Martin Blumenstingl Link: https://lore.kernel.org/lkml/20230403212434.296975-1-martin.blumenstingl@googlemail.com/ Tested-by: Guenter Roeck Tested-by: Shahab Vahedi Tested-by: Marek Szyprowski Tested-by: Martin Blumenstingl Suggested-by: Russell King (Oracle) Signed-off-by: Michael Sit Wei Hong Link: https://lore.kernel.org/r/20230406024541.3556305-1-michael.wei.hong.sit@intel.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 38abc898f149..d7fcab057032 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -1134,22 +1134,26 @@ static void stmmac_check_pcs_mode(struct stmmac_priv *priv) static int stmmac_init_phy(struct net_device *dev) { struct stmmac_priv *priv = netdev_priv(dev); + struct fwnode_handle *phy_fwnode; struct fwnode_handle *fwnode; - bool phy_needed; int ret; + if (!phylink_expects_phy(priv->phylink)) + return 0; + fwnode = of_fwnode_handle(priv->plat->phylink_node); if (!fwnode) fwnode = dev_fwnode(priv->device); if (fwnode) - ret = phylink_fwnode_phy_connect(priv->phylink, fwnode, 0); + phy_fwnode = fwnode_get_phy_node(fwnode); + else + phy_fwnode = NULL; - phy_needed = phylink_expects_phy(priv->phylink); /* Some DT bindings do not set-up the PHY handle. Let's try to * manually parse it */ - if (!fwnode || phy_needed || ret) { + if (!phy_fwnode || IS_ERR(phy_fwnode)) { int addr = priv->plat->phy_addr; struct phy_device *phydev; @@ -1165,6 +1169,9 @@ static int stmmac_init_phy(struct net_device *dev) } ret = phylink_connect_phy(priv->phylink, phydev); + } else { + fwnode_handle_put(phy_fwnode); + ret = phylink_fwnode_phy_connect(priv->phylink, fwnode, 0); } if (!priv->plat->pmt) { -- cgit v1.2.3