netdev - Re: [RESENT PATCH net--stat 1/1] net: ethernet: fec: Revert "net: ethernet: fec: Replace interrupt driven MDIO with polled IO"

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Date:   Sun, 26 Jul 2020 19:35:51 -0700
From:   Chris Healy <cphealy@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Fugang Duan <fugang.duan@....com>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Martin Fuzzey <martin.fuzzey@...wbird.group>
Subject: Re: [RESENT PATCH net--stat 1/1] net: ethernet: fec: Revert "net:
 ethernet: fec: Replace interrupt driven MDIO with polled IO"

Hi Laurent,

I have the exact same copper PHY.  I just reverted a patch specific to
this PHY and went from broken to working.  Give this a try:

git revert bcf3440c6dd78bfe5836ec0990fe36d7b4bb7d20

Regards,

Chris

On Sun, Jul 26, 2020 at 7:33 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Andrew,
>
> On Mon, Jul 27, 2020 at 04:14:32AM +0200, Andrew Lunn wrote:
> > On Mon, Jul 27, 2020 at 05:06:31AM +0300, Laurent Pinchart wrote:
> > > On Mon, Jul 27, 2020 at 04:24:02AM +0300, Laurent Pinchart wrote:
> > > > On Mon, Apr 27, 2020 at 10:08:04PM +0800, Fugang Duan wrote:
> > > > > This reverts commit 29ae6bd1b0d8a57d7c00ab12cbb949fc41986eef.
> > > > >
> > > > > The commit breaks ethernet function on i.MX6SX, i.MX7D, i.MX8MM,
> > > > > i.MX8MQ, and i.MX8QXP platforms. Boot yocto system by NFS mounting
> > > > > rootfs will be failed with the commit.
> > > >
> > > > I'm afraid this commit breaks networking on i.MX7D for me :-( My board
> > > > is configured to boot over NFS root with IP autoconfiguration through
> > > > DHCP. The DHCP request goes out, the reply it sent back by the server,
> > > > but never noticed by the fec driver.
> > > >
> > > > v5.7 works fine. As 29ae6bd1b0d8a57d7c00ab12cbb949fc41986eef was merged
> > > > during the v5.8 merge window, I suspect something else cropped in
> > > > between 29ae6bd1b0d8a57d7c00ab12cbb949fc41986eef and this patch that
> > > > needs to be reverted too. We're close to v5.8 and it would be annoying
> > > > to see this regression ending up in the released kernel. I can test
> > > > patches, but I'm not familiar enough with the driver (or the networking
> > > > subsystem) to fix the issue myself.
> > >
> > > If it can be of any help, I've confirmed that, to get the network back
> > > to usable state from v5.8-rc6, I have to revert all patches up to this
> > > one. This is the top of my branch, on top of v5.8-rc6:
> > >
> > > 5bbe80c9efea Revert "net: ethernet: fec: Revert "net: ethernet: fec: Replace interrupt driven MDIO with polled IO""
> > > 5462896a08c1 Revert "net: ethernet: fec: Replace interrupt driven MDIO with polled IO"
> > > 824a82e2bdfa Revert "net: ethernet: fec: move GPR register offset and bit into DT"
> > > bfe330591cab Revert "net: fec: disable correct clk in the err path of fec_enet_clk_enable"
> > > 109958cad578 Revert "net: ethernet: fec: prevent tx starvation under high rx load"
> >
> > OK.
> >
> > What PHY are you using? A Micrel?
>
> KSZ9031RNXIA
>
> > And which DT file?
>
> It's out of tree.
>
> &fec1 {
>         pinctrl-names = "default";
>         pinctrl-0 = <&pinctrl_enet1>;
>         assigned-clocks = <&clks IMX7D_ENET1_TIME_ROOT_SRC>,
>                           <&clks IMX7D_ENET1_TIME_ROOT_CLK>;
>         assigned-clock-parents = <&clks IMX7D_PLL_ENET_MAIN_100M_CLK>;
>         assigned-clock-rates = <0>, <100000000>;
>         phy-mode = "rgmii";
>         phy-handle = <&ethphy0>;
>         phy-reset-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;
>         phy-supply = <&reg_3v3_sw>;
>         fsl,magic-packet;
>         status = "okay";
>
>         mdio {
>                 #address-cells = <1>;
>                 #size-cells = <0>;
>
>                 ethphy0: ethernet-phy@0 {
>                         reg = <1>;
>                 };
>
>                 ethphy1: ethernet-phy@1 {
>                         reg = <2>;
>                 };
>         };
> };
>
> I can provide the full DT if needed.
>
> --
> Regards,
>
> Laurent Pinchart