linux-kernel - Re: [PATCH] MIPS: loongson32: Fix the validation failure of LS1B & LS1C Ethernet PHY

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Message-ID: <20220902224630.tik2zt7vpwv3pcww@mobilestation>
Date:   Sat, 3 Sep 2022 01:46:30 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Kelvin Cheung <keguang.zhang@...il.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH] MIPS: loongson32: Fix the validation failure of LS1B &
 LS1C Ethernet PHY

On Sun, Aug 28, 2022 at 09:31:25PM +0800, Kelvin Cheung wrote:
> Hi Serge,
> Your patch also works for me.

Great. Could you submit it for review then with your tested-by tag
added?

> But what about the plat_dat->interface? Is it obsolete?

No. As I said in the patch log it's still used in the STMMAC driver
but for the MAC-PCS mode setting. Such PCS isn't available on the most
of the cases so the "phy_interface" field should be mainly utilized
instead while the "interface" field is supposed to be left untouched.
See the commit 0060c8783330 ("net: stmmac: implement support for
passive mode converters via dt") for details.

-Sergey

> 
> Serge Semin <fancer.lancer@...il.com> 于2022年8月22日周一 01:10写道：
> >
> > Hello Keguang
> >
> > On Thu, Aug 18, 2022 at 01:00:19PM +0800, Keguang Zhang wrote:
> > > From: Kelvin Cheung <keguang.zhang@...il.com>
> > >
> > > The Ethernet of LS1B/LS1C doesn't work due to the stmmac driver
> > > using phylink_generic_validate() instead of stmmac_validate().
> > > Moreover the driver assumes the PHY interface mode
> > > passed in platform data is always supported.
> > >
> > > stmmaceth stmmaceth.0 eth0: validation of gmii with support 00000000,00000000,000062cf and advertisement 00000000,00000000,000062cf failed: -EINVAL
> > > stmmaceth stmmaceth.0 eth0: stmmac_open: Cannot attach to PHY (error: -22)
> > >
> > > This patch sets phy_interface field of platform data.
> >
> > I've got a similar fix in my repo, though didn't have a chance to test
> > it out due to lacking any loongson hardware. I've discovered the
> > issues on my still going way of the STMMAC driver refactoring. Anyway
> > IMO the problem is a bit different than you describe and should be
> > fixed in a bit different way. Please see a patch attached to this
> > email. Could you test it out on your hw? If it fixes the problem you
> > can resend it as v2 patch.
> >
> > -Sergey
> >
> > >
> > > Fixes: 04a0683f7db4 ("net: stmmac: convert to phylink_generic_validate()")
> > > Fixes: d194923d51c9 ("net: stmmac: fill in supported_interfaces")
> > > Signed-off-by: Kelvin Cheung <keguang.zhang@...il.com>
> > > ---
> > >  arch/mips/loongson32/common/platform.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/arch/mips/loongson32/common/platform.c b/arch/mips/loongson32/common/platform.c
> > > index 794c96c2a4cd..741aace80b80 100644
> > > --- a/arch/mips/loongson32/common/platform.c
> > > +++ b/arch/mips/loongson32/common/platform.c
> > > @@ -147,8 +147,10 @@ static struct plat_stmmacenet_data ls1x_eth0_pdata = {
> > >       .phy_addr               = -1,
> > >  #if defined(CONFIG_LOONGSON1_LS1B)
> > >       .interface              = PHY_INTERFACE_MODE_MII,
> > > +     .phy_interface          = PHY_INTERFACE_MODE_MII,
> > >  #elif defined(CONFIG_LOONGSON1_LS1C)
> > >       .interface              = PHY_INTERFACE_MODE_RMII,
> > > +     .phy_interface          = PHY_INTERFACE_MODE_RMII,
> > >  #endif
> > >       .mdio_bus_data          = &ls1x_mdio_bus_data,
> > >       .dma_cfg                = &ls1x_eth_dma_cfg,
> > >
> > > base-commit: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868
> > > --
> > > 2.34.1
> > >
> 
> 
> 
> -- 
> Best regards,
> 
> Kelvin Cheung