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

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Date:   Sun, 11 Sep 2022 14:27:03 +0800
From:   Kelvin Cheung <keguang.zhang@...il.com>
To:     Serge Semin <fancer.lancer@...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

Hi Serge,

Serge Semin <fancer.lancer@...il.com> 于2022年9月3日周六 06:46写道：
>
> 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?

Sure.

>
> > 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.

Got it. Thanks!

>
> -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



-- 
Best regards,

Kelvin Cheung