> -----Original Message----- > From: Heiner Kallweit <hkallweit1@xxxxxxxxx> > Sent: Wednesday, March 17, 2021 4:15 PM > To: Wong, Vee Khee <vee.khee.wong@xxxxxxxxx>; Andrew Lunn > <andrew@xxxxxxx>; Russell King <linux@xxxxxxxxxxxxxxx>; David S . Miller > <davem@xxxxxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx> > Cc: netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > stable@xxxxxxxxxxxxxxx; Voon Weifeng <voon.weifeng@xxxxxxxxx>; Ong, > Boon Leong <boon.leong.ong@xxxxxxxxx> > Subject: Re: [PATCH net-next 1/1] net: phy: fix invalid phy id when probe > using C22 > > On 16.03.2021 09:57, Wong Vee Khee wrote: > > When using Clause-22 to probe for PHY devices such as the Marvell > > 88E2110, PHY ID with value 0 is read from the MII PHYID registers > > which caused the PHY framework failed to attach the Marvell PHY > > driver. > > > > The issue occurs with a MAC driver that sets MDIO bus capability > flag MDIOBUS_C22_C45, like stmmac? Or what is the affected MAC > driver? > Yes, you are right. This issue is seen when MarvellE2110 is used with the STMMAC. > And if you state it's a fix, a Fixes tag would be needed. > Noted. Will send a v2 and marked for net. > > Fixed this by adding a check of PHY ID equals to all zeroes. > > > > Cc: stable@xxxxxxxxxxxxxxx > > Reviewed-by: Voon Weifeng <voon.weifeng@xxxxxxxxx> > > Signed-off-by: Wong Vee Khee <vee.khee.wong@xxxxxxxxx> > > --- > > drivers/net/phy/phy_device.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c > > index a009d1769b08..f1afc00fcba2 100644 > > --- a/drivers/net/phy/phy_device.c > > +++ b/drivers/net/phy/phy_device.c > > @@ -820,8 +820,8 @@ static int get_phy_c22_id(struct mii_bus *bus, int > addr, u32 *phy_id) > > > > *phy_id |= phy_reg; > > > > - /* If the phy_id is mostly Fs, there is no device there */ > > - if ((*phy_id & 0x1fffffff) == 0x1fffffff) > > + /* If the phy_id is mostly Fs or all zeroes, there is no device there */ > > + if (((*phy_id & 0x1fffffff) == 0x1fffffff) || (*phy_id == 0)) > > return -ENODEV; > > > > return 0; > >
