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From: "Clément Péron" <peron.clem@gmail.com>
To: Icenowy Zheng <icenowy@aosc.io>
Cc: "Jernej Škrabec" <jernej.skrabec@siol.net>,
	"Chen-Yu Tsai" <wens@kernel.org>,
	"Maxime Ripard" <mripard@kernel.org>,
	linux-sunxi <linux-sunxi@googlegroups.com>,
	"Chen-Yu Tsai" <wens@csie.org>,
	devicetree <devicetree@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [linux-sunxi] [PATCH 02/10] ARM: dts: sun6i: a31-hummingbird: Enable RGMII RX/TX delay on Ethernet PHY
Date: Sat, 24 Oct 2020 21:09:52 +0200
Message-ID: <CAJiuCccANajJbXqJ8mrOzL0jFdsbrrtFbMqfrqPAWEt6pBMNSA@mail.gmail.com> (raw)
In-Reply-To: <9D317C52-5F28-41A9-80DA-DBADA142B042@aosc.io>

Hi,

On Sat, 24 Oct 2020 at 20:39, Icenowy Zheng <icenowy@aosc.io> wrote:
>
>
>
> 于 2020年10月25日 GMT+08:00 上午2:30:35, "Jernej Škrabec" <jernej.skrabec@siol.net> 写到:
> >Dne sobota, 24. oktober 2020 ob 19:51:06 CEST je Icenowy Zheng
> >napisal(a):
> >> 在 2020-10-25星期日的 00:25 +0800,Chen-Yu Tsai写道:
> >>
> >> > From: Chen-Yu Tsai <wens@csie.org>
> >> >
> >> > The Ethernet PHY on the A31 Hummingbird has the RX and TX delays
> >> > enabled on the PHY, using pull-ups on the RXDLY and TXDLY pins.
> >> >
> >> > Fix the phy-mode description to correct reflect this so that the
> >> > implementation doesn't reconfigure the delays incorrectly. This
> >> > happened with commit bbc4d71d6354 ("net: phy: realtek: fix rtl8211e
> >> > rx/tx delay config").
> >>
> >> Personally I think they should revert this commit, and consider other
> >> solution.
> >>
> >> This commit breaks everything.
> >>
> >
> >Previously broken driver allowed inproper DT to work, so you have to
> >fix
> >everything eventually.
>
> There is no "improper DT" if it's already shipped, DT should suffer driver
> change, not changed to match driver.
>
> I think at least Fedora tends to ship a DT with a system image that will
> not get updated when kernel gets updated.

I think we are missing a phy-mode saying use RGMII but don't change
the delay set by the hardware.
Or maybe introduce a phy-mode='rgmii-noid' to explicitly disable the
RX/TD delay using software bits
and use phy-mode='rgmii' to keep the delay set by the hardware.

Clement

>
> >
> >Plus side, there is no need to have hack for Pine64 Plus ethernet
> >anymore.
> >
> >Best regards,
> >Jernej
> >
> >> (Although the patch on individual DT patches are technically correct)
> >>
> >> > Fixes: c220aec2bb79 ("ARM: dts: sun6i: Add Merrii A31 Hummingbird
> >> > support")
> >> > Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> >> > ---
> >> >
> >> >  arch/arm/boot/dts/sun6i-a31-hummingbird.dts | 2 +-
> >> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >> >
> >> > diff --git a/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
> >> > b/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
> >> > index 049e6ab3cf56..73de34ae37fd 100644
> >> > --- a/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
> >> > +++ b/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
> >> > @@ -154,7 +154,7 @@ &gmac {
> >> >
> >> >    pinctrl-names = "default";
> >> >    pinctrl-0 = <&gmac_rgmii_pins>;
> >> >    phy-handle = <&phy1>;
> >> >
> >> > -  phy-mode = "rgmii";
> >> > +  phy-mode = "rgmii-id";
> >> >
> >> >    status = "okay";
> >> >
> >> >  };
>
> --
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  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-24 16:25 [PATCH 01/10] Revert "arm: sun8i: orangepi-pc-plus: Set EMAC activity LEDs to active high" Chen-Yu Tsai
2020-10-24 16:25 ` [PATCH 02/10] ARM: dts: sun6i: a31-hummingbird: Enable RGMII RX/TX delay on Ethernet PHY Chen-Yu Tsai
2020-10-24 17:51   ` [linux-sunxi] " Icenowy Zheng
2020-10-24 18:30     ` Jernej Škrabec
2020-10-24 18:39       ` Icenowy Zheng
2020-10-24 19:09         ` Clément Péron [this message]
2020-10-26  7:38         ` Ard Biesheuvel
2020-10-25  8:58   ` Jernej Škrabec
2020-10-24 16:25 ` [PATCH 03/10] ARM: dts: sun7i: cubietruck: " Chen-Yu Tsai
2020-10-24 17:04   ` [linux-sunxi] " Emilio López
2020-10-24 16:25 ` [PATCH 04/10] ARM: dts: sun7i: bananapi-m1-plus: " Chen-Yu Tsai
2020-10-25  8:51   ` Jernej Škrabec
2020-10-24 16:25 ` [PATCH 05/10] ARM: dts: sun8i: h3: orangepi-plus2e: " Chen-Yu Tsai
2020-10-25  7:53   ` Jernej Škrabec
2020-10-24 16:25 ` [PATCH 06/10] ARM: dts: sun8i: a83t: Enable both " Chen-Yu Tsai
2020-10-25  8:48   ` Jernej Škrabec
2020-10-24 16:25 ` [PATCH 07/10] ARM: dts: sun9i: " Chen-Yu Tsai
2020-10-25  8:40   ` Jernej Škrabec
2020-10-24 16:25 ` [PATCH 08/10] ARM: dts: sunxi: bananapi-m2-plus: Enable " Chen-Yu Tsai
2020-10-25  8:01   ` Jernej Škrabec
2020-10-24 16:25 ` [PATCH 09/10] arm64: dts: allwinner: h5: libretech-all-h5-cc: Enable RGMII RX/TX delay on PHY Chen-Yu Tsai
2020-10-25  9:02   ` Jernej Škrabec
2020-10-24 16:25 ` [PATCH 10/10] arm64: dts: allwinner: a64: bananapi-m64: " Chen-Yu Tsai
2020-10-24 19:58   ` [linux-sunxi] " Corentin Labbe
2020-10-25  8:34     ` Jernej Škrabec
2020-10-26 10:24   ` Maxime Ripard
2020-10-25  7:35 ` [PATCH 01/10] Revert "arm: sun8i: orangepi-pc-plus: Set EMAC activity LEDs to active high" Jernej Škrabec

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