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Message-ID: <ZMkddjabRonGe7Eu@shell.armlinux.org.uk>
Date: Tue, 1 Aug 2023 15:57:58 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Michael Walle <mwalle@...nel.org>
Cc: Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Yisen Zhuang <yisen.zhuang@...wei.com>,
Salil Mehta <salil.mehta@...wei.com>,
Florian Fainelli <florian.fainelli@...adcom.com>,
Broadcom internal kernel review list
<bcm-kernel-feedback-list@...adcom.com>,
Marek BehĂșn <kabel@...nel.org>,
Xu Liang <lxu@...linear.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Simon Horman <simon.horman@...igine.com>
Subject: Re: [PATCH net-next v3 02/11] net: phy: introduce
phy_has_c45_registers()
On Tue, Aug 01, 2023 at 04:47:04PM +0200, Michael Walle wrote:
> Hi Andrew,
>
> Am 2023-07-19 09:11, schrieb Michael Walle:
> > > > diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
> > > > index a64186dc53f8..686a57d56885 100644
> > > > --- a/drivers/net/phy/phy-core.c
> > > > +++ b/drivers/net/phy/phy-core.c
> > > > @@ -556,7 +556,7 @@ int __phy_read_mmd(struct phy_device
> > > > *phydev, int devad, u32 regnum)
> > > >
> > > > if (phydev->drv && phydev->drv->read_mmd) {
> > > > val = phydev->drv->read_mmd(phydev, devad, regnum);
> > > > - } else if (phydev->is_c45) {
> > > > + } else if (phy_has_c45_registers(phydev)) {
> > >
> > > This i would say should be
> > >
> > > phy_has_c45_transfers(phydev). This is about, can we do C45 transfers
> > > on the bus, and if not, fall back to C45 over C22.
> >
> > Shouldn't this then be a bus property? I.e. mdiobus_has_c45_transfers().
> > I've have a similar helper introduced in 9/11:
> >
> > static inline bool mdiobus_supports_c45(struct mii_bus *bus)
> > {
> > return bus->read_c45 && !bus->prevent_c45_access;
> > }
In the case of the above (the code in __phy_read_mmd()), I wouldn't
at least initially change the test there.
phydev->is_c45 will only be true if we probed the PHY using clause
45 accesses. Thus, it will be set if "the bus supports clause 45
accesses" _and_ "the PHY responds to those accesses".
Changing that to only "the bus supports clause 45 accesses" means
that a PHY supporting only clause 22 access with indirect clause
45 access then fails if it's used with a bus that supports both
clause 22 and clause 45 accesses.
--
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