linux-kernel - Re: [PATCH] ARM: dts: am5729: beaglebone-ai: fix rgmii phy-mode

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Date:   Mon, 15 Jun 2020 14:45:06 +0200
From:   Drew Fustini <drew@...gleboard.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     Tony Lindgren <tony@...mide.com>, Rob Herring <robh+dt@...nel.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>,
        Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH] ARM: dts: am5729: beaglebone-ai: fix rgmii phy-mode

On Mon, Jun 15, 2020 at 12:34:57PM +0300, Grygorii Strashko wrote:
> 
> 
> On 12/06/2020 01:09, Drew Fustini wrote:
> > Since commit cd28d1d6e52e ("net: phy: at803x: Disable phy delay for
> > RGMII mode") the networking is broken on the BeagleBone AI which has
> > the AR8035 PHY for Gigabit Ethernet [0].  The fix is to switch from
> > phy-mode = "rgmii" to phy-mode = "rgmii-rxid".
> > 
> > Note: Grygorii Strashko made a similar phy-mode fix in 820f8a870f65 for
> > other AM5729 boards.
> 
> commit ref is incorrect

Do you mean commit ref 820f8a870f65 ? 
("ARM: dts: am57xx: fix networking on boards with ksz9031 phy")

I thought it made sense to point to that commit as you seemed to be
fixing a very similar issue, just for a different phy.

Or did you mean commit ref cd28d1d6e52e ?
("net: phy: at803x: Disable phy delay for RGMII mode")

I believe this is the commit that made it necessary to change the
phy-mode property for the AR8035 PHY.

> > 
> > [0] https://github.com/beagleboard/beaglebone-ai/blob/master/BeagleBone-AI_sch.pdf
> > 
> > Cc: Vinod Koul <vkoul@...nel.org>
> > Cc: Grygorii Strashko <grygorii.strashko@...com>
> > Fixes: cd28d1d6e52e ("net: phy: at803x: Disable phy delay for RGMII mode")
> 
> Pls change fixed tag to
> 520557d4854b ARM: dts: am5729: beaglebone-ai: adding device tree
> as this board DTB was merged only in 5.8.

Ok, will do.

> 
> > Signed-off-by: Robert Nelson <robertcnelson@...il.com>
> > Signed-off-by: Drew Fustini <drew@...gleboard.org>
> > ---
> >   arch/arm/boot/dts/am5729-beagleboneai.dts | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm/boot/dts/am5729-beagleboneai.dts b/arch/arm/boot/dts/am5729-beagleboneai.dts
> > index 9877d7709d41..4c51c6b05e64 100644
> > --- a/arch/arm/boot/dts/am5729-beagleboneai.dts
> > +++ b/arch/arm/boot/dts/am5729-beagleboneai.dts
> > @@ -505,7 +505,7 @@ &mac {
> >   &cpsw_emac0 {
> >   	phy-handle = <&phy0>;
> > -	phy-mode = "rgmii";
> > +	phy-mode = "rgmii-rxid";
> >   };
> >   &ocp {
> > 
> 
> Thanks, pls fix above and you can add my
> Reviewed-by: Grygorii Strashko <grygorii.strashko@...com>
> 
> -- 
> Best regards,
> grygorii

Thanks for taking the time to review.

-Drew