netdev - Re: [PATCH v5 11/12] riscv: dts: starfive: visionfive-2-v1.2a: Add gmac+phy's delay configuration

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Date:   Tue, 7 Mar 2023 13:40:56 +0100
From:   Emil Renner Berthing <emil.renner.berthing@...onical.com>
To:     Guo Samin <samin.guo@...rfivetech.com>
Cc:     linux-riscv@...ts.infradead.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Richard Cochran <richardcochran@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>
Subject: Re: [PATCH v5 11/12] riscv: dts: starfive: visionfive-2-v1.2a: Add
 gmac+phy's delay configuration

On Tue, 7 Mar 2023 at 02:43, Guo Samin <samin.guo@...rfivetech.com> wrote:
> 在 2023/3/6 21:00:19, Emil Renner Berthing 写道:
> > On Fri, 3 Mar 2023 at 10:01, Samin Guo <samin.guo@...rfivetech.com> wrote:
> >> v1.2A gmac0 uses motorcomm YT8531(rgmii-id) PHY, and needs delay
> >> configurations.
> >>
> >> v1.2A gmac1 uses motorcomm YT8512(rmii) PHY, and needs to
> >> switch rx and rx to external clock sources.
> >>
> >> Signed-off-by: Samin Guo <samin.guo@...rfivetech.com>
> >> ---
> >>  .../starfive/jh7110-starfive-visionfive-2-v1.2a.dts | 13 +++++++++++++
> >>  1 file changed, 13 insertions(+)
> >>
> >> diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2-v1.2a.dts b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2-v1.2a.dts
> >> index 4af3300f3cf3..205a13d8c8b1 100644
> >> --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2-v1.2a.dts
> >> +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2-v1.2a.dts
> >> @@ -11,3 +11,16 @@
> >>         model = "StarFive VisionFive 2 v1.2A";
> >>         compatible = "starfive,visionfive-2-v1.2a", "starfive,jh7110";
> >>  };
> >> +
> >> +&gmac1 {
> >> +       phy-mode = "rmii";
> >> +       assigned-clocks = <&syscrg JH7110_SYSCLK_GMAC1_TX>,
> >> +                         <&syscrg JH7110_SYSCLK_GMAC1_RX>;
> >> +       assigned-clock-parents = <&syscrg JH7110_SYSCLK_GMAC1_RMII_RTX>,
> >> +                                <&syscrg JH7110_SYSCLK_GMAC1_RMII_RTX>;
> >> +};
> >> +
> >> +&phy0 {
> >> +       rx-internal-delay-ps = <1900>;
> >> +       tx-internal-delay-ps = <1350>;
> >> +};
> >
> > Here you're not specifying the internal delays for phy1 which means it
> > defaults to 1950ps for both rx and tx. Is that right or did you mean
> > to set them to 0 like the v1.3b phy1?
>
> Hi, emil, usually, only 1000M (rgmii) needs to configure the delay, and 100M(rmii) does not.

Ah, I see.

> > Also your u-boot seems to set what the linux phy driver calls
> > motorcomm,keep-pll-enabled and motorcomm,auto-sleep-disabled for all
> > the phys. Did you leave those out on purpose?
>
> Hi, Emil, We did configure motorcomm,auto-sleep-disabled for yt8512 in uboot,
> but Yutai upstream's Linux driver only yt8521/yt8531 supports this property.

I'm confused. Is Yutai also Frank Sae? Because he is the one who added
support for the yt8531 upstream.

> Yt8512 is a Generic PHY driver and does not support the configuration of
> motorcomm,auto-sleep-disabled and motorcomm,keep-pll-enabled.

Right phy1 of the 1.2a might use a different phy, but I'm also talking
about phy0 and the v1.3b which does use the yt8531 right?

> And without configuring these two attributes, vf2-1.2a gmac1 also works normally.

Yes, but what I'm worried about is that it only works because u-boot
initialises the PHYs and ethernet may stop working if you're using a
different bootloader or Linux gains support for resetting the PHYs
before use.

>
> Best regards,
> Samin
> >
> >> --
> >> 2.17.1
> >>
> >>
> >> _______________________________________________
> >> linux-riscv mailing list
> >> linux-riscv@...ts.infradead.org
> >> http://lists.infradead.org/mailman/listinfo/linux-riscv
>
> --
> Best regards,
> Samin

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