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Message-ID: <20190811034742.349f0ef1@nic.cz> Date: Sun, 11 Aug 2019 03:47:42 +0200 From: Marek Behun <marek.behun@....cz> To: netdev@...r.kernel.org Cc: Heiner Kallweit <hkallweit1@...il.com>, Sebastian Reichel <sebastian.reichel@...labora.co.uk>, Vivien Didelot <vivien.didelot@...il.com>, Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, "David S . Miller" <davem@...emloft.net> Subject: Re: [PATCH net-next 1/1] net: dsa: fix fixed-link port registration This should probably go into stable as well, after review. Marek On Sun, 11 Aug 2019 03:46:50 +0200 Marek BehĂșn <marek.behun@....cz> wrote: > Commit 88d6272acaaa ("net: phy: avoid unneeded MDIO reads in > genphy_read_status") broke fixed link DSA port registration in > dsa_port_fixed_link_register_of: the genphy_read_status does not do what > it is supposed to and the following adjust_link is given wrong > parameters. > > This causes a regression on Turris Omnia, where the mvneta driver for > the interface connected to the switch reports crc errors, for some > reason. > > I realize this fix is not ideal, something else could change in genphy > functions which could cause DSA fixed-link port to break again. > Hopefully DSA fixed-link port functionality will be converted to phylink > API soon. > > Signed-off-by: Marek BehĂșn <marek.behun@....cz> > Cc: Heiner Kallweit <hkallweit1@...il.com> > Cc: Sebastian Reichel <sebastian.reichel@...labora.co.uk> > Cc: Vivien Didelot <vivien.didelot@...il.com> > Cc: Andrew Lunn <andrew@...n.ch> > Cc: Florian Fainelli <f.fainelli@...il.com> > Cc: David S. Miller <davem@...emloft.net> > --- > net/dsa/port.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/net/dsa/port.c b/net/dsa/port.c > index 363eab6df51b..c424ebb373e1 100644 > --- a/net/dsa/port.c > +++ b/net/dsa/port.c > @@ -485,6 +485,17 @@ static int dsa_port_fixed_link_register_of(struct dsa_port *dp) > phydev->interface = mode; > > genphy_config_init(phydev); > + > + /* > + * Commit 88d6272acaaa caused genphy_read_status not to do it's work if > + * autonegotiation is enabled and link status did not change. This is > + * the case for fixed_phy. By setting phydev->link = 0 before the call > + * to genphy_read_status we force it to read and fill in the parameters. > + * > + * Hopefully this dirty hack will be removed soon by converting DSA > + * fixed link ports to phylink API. > + */ > + phydev->link = 0; > genphy_read_status(phydev); > > if (ds->ops->adjust_link)
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