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SubjectRE: [PATCH net-next 1/1] net: phy: fix invalid phy id when probe using C22
Date
> -----Original Message-----
> From: Heiner Kallweit <hkallweit1@gmail.com>
> Sent: Wednesday, March 17, 2021 4:15 PM
> To: Wong, Vee Khee <vee.khee.wong@intel.com>; Andrew Lunn
> <andrew@lunn.ch>; Russell King <linux@armlinux.org.uk>; David S . Miller
> <davem@davemloft.net>; Jakub Kicinski <kuba@kernel.org>
> Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org;
> stable@vger.kernel.org; Voon Weifeng <voon.weifeng@intel.com>; Ong,
> Boon Leong <boon.leong.ong@intel.com>
> 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@vger.kernel.org
> > Reviewed-by: Voon Weifeng <voon.weifeng@intel.com>
> > Signed-off-by: Wong Vee Khee <vee.khee.wong@intel.com>
> > ---
> > 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;
> >

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