Regression, bisected: meson-dwmac8b never loads, no ethernet

[Geraldo Nascimento]

Hi Neil and Martin,

On Tue, Sep 21, 2021 at 3:57 AM Neil Armstrong <narmstrong at baylibre.com> wrote:
>
> Hi Geraldo,
>
> Thanks for the report
>
> On 21/09/2021 07:31, Martin Blumenstingl wrote:
> > Hi Geraldo,
> >
> > On Tue, Sep 21, 2021 at 4:09 AM Geraldo Nascimento
> > <geraldogabriel at gmail.com> wrote:
> >>
> >> Sorry to add further noise to this, as there's still 6 release candidates to solve this regression, but the correct name of the driver is meson8b-dwmac.
> >>
> >> You see, git bisecting the kernel had my head spinning so much that I apparently switched the proper driver name.
> >>
> >> Speaking of which, I swear I ran git bisect every time telling it good when where's good and vice-versa. And was I left with a qcom general device tree commit that also merges qcom 5.14-rc3 into 5.15 because of a regression in USB apparently?
> > Which board/SoC are you referring to?
> > I can confirm that dwmac-meson8b still works fine on an Odroid-C1
> > (Meson8b SoC) with 5.15-rc2

At least for me the issue is gone in 5.15-rc2 and present only in 5.15-rc1

My board is is based on the q200 reference design, with 1 GbE external phy.

The only difference between my board and the q200 reference AFAIK is
an Atheros Qualcomm WiFi / BT chip, QCA9377 but this is unrelated.

It's a TV Box branded as H96 Pro+
> > Newer (arm64) SoCs additionally use an MDIO mux driver:
> > - mdio-mux-mmioreg on GXL, GXM
> > - mdio-mux-meson-g12a on G12A, G12B, SM1
>
> Indeed it's an issue with mdio muxes, a similar issue had been reported by Marek at https://lore.kernel.org/all/0a2c4106-7f48-2bb5-048e-8c001a7c3fda@samsung.com/
> and it concerns commit cf4b94c8530d ("of: property: fw_devlink: Add support for "phy-handle" property")
>
> It may be the same issue here.
>

Whatever it was, it seems to be gone at least for me in 5.15-rc2 so it
seems to be low priority unless it reappears.

Thanks,
Geraldo Nascimento

> Neil
>
> >
> >
> > Best regards,
> > Martin
> >
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> >
>