Subject: Re: [PATCH] ARM: dts: imx6dl: SolidRun: add phy node with 100Mb/s max-speed

From: Baruch Siach <[email-masked]>
Date: Sun, 15 Sep 2019 09:30:00 +0300

Hi Andrew,

On Tue, Sep 10 2019, Andrew Lunn wrote:
> On Tue, Sep 10, 2019 at 06:55:07PM +0300, tinywrkb wrote:
>> Cubox-i Solo/DualLite carrier board has 100Mb/s magnetics while the
>> Atheros AR8035 PHY on the MicroSoM v1.3 CPU module is a 1GbE PHY device.
>>
>> Since commit 5502b218e001 ("net: phy: use phy_resolve_aneg_linkmode in
>> genphy_read_status") ethernet is broken on Cubox-i Solo/DualLite devices.
>
> Hi Tinywrkb
>
> You emailed lots of people, but missed the PHY maintainers :-(
>
> Are you sure this is the patch which broken it? Did you do a git
> bisect.

Tinywrkb confirmed to me in private communication that revert of
5502b218e001 fixes Ethernet for him on effected system.

He also referred me to an old Cubox-i spec that lists 10/100 Ethernet
only for i.MX6 Solo/DualLite variants of Cubox-i. It turns out that
there was a plan to use a different 10/100 PHY for Solo/DualLite
SOMs. This plan never materialized. All SolidRun i.MX6 SOMs use the same
AR8035 PHY that supports 1Gb.

Commit 5502b218e001 might be triggering a hardware issue on the affected
Cubox-i. I could not reproduce the issue here with Cubox-i and a Dual
SOM variant running v5.3-rc8. I have no Solo/DualLite variant handy at
the moment.

baruch

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