Current code fails to probe some C45 PHYs that also respond to C22 reads. This is the case for PHYs like Aquantia AQR112, Marvell 88X2242 (as previously posted on the u-boot list). If the PHY ID reads all 0s just ignore it and try the next devad.
Signed-off-by: Alex Marginean alexm.osslist@gmail.com --- drivers/net/phy/phy.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index c1c1af9abd..7ccbc4d9da 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -727,6 +727,15 @@ static struct phy_device *create_phy_by_mask(struct mii_dev *bus, while (phy_mask) { int addr = ffs(phy_mask) - 1; int r = get_phy_id(bus, addr, devad, &phy_id); + + /* If the PHY ID is flat 0 we ignore it. There are C45 PHYs + * that return all 0s for C22 reads (like Aquantia AQR112) and + * there are C22 PHYs that return all 0s for C45 reads (like + * Atheros AR8035). + */ + if (phy_id == 0) + return NULL; + /* If the PHY ID is mostly f's, we didn't find anything */ if (r == 0 && (phy_id & 0x1fffffff) != 0x1fffffff) { is_c45 = (devad == MDIO_DEVAD_NONE) ? false : true;