linux-kernel - Re: [PATCH v2 3/5] ARM: dts: meson: fix PHY deassert timing requirements

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Message-ID: <1275fb519490b00a079ac832277585f1@agner.ch>
Date:   Mon, 07 Dec 2020 18:53:43 +0100
From:   Stefan Agner <stefan@...er.ch>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     khilman@...libre.com, robh+dt@...nel.org,
        Neil Armstrong <narmstrong@...libre.com>, jbrunet@...libre.com,
        christianshewitt@...il.com, jian.hu@...ogic.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] ARM: dts: meson: fix PHY deassert timing
 requirements

On 2020-12-05 14:04, Martin Blumenstingl wrote:
> Hi Stefan,
> 
> On Tue, Dec 1, 2020 at 2:21 PM Stefan Agner <stefan@...er.ch> wrote:
>>
>> According to the datasheet (Rev. 1.9) the RTL8211F requires at least
>> 72ms "for internal circuits settling time" before accessing the PHY
>> egisters. On similar boards with the same PHY this fixes an issue where
> there's a typo here: it should be "registers"
> this is the same for the other four patches also

Whoops, will send v3 shortly.

> 
>> Ethernet link would not come up when using ip link set down/up.
> I have never experienced that myself but gotten a few reports about this.
> thank you very much for coming up with info from the datasheet!
> 
> the following stmmac patch [0] has been added recently which may - or
> may not - have any impact also.

Thanks for the hint, wasn't aware of that.

--
Stefan

> 
>> Fixes: a2c6e82e5341 ("ARM: dts: meson: switch to the generic Ethernet PHY reset bindings")
>> Signed-off-by: Stefan Agner <stefan@...er.ch>
> with above typo fixed:
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> and also:
> Tested-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com> #
> on Odroid-C1+
> 
> 
> Best regards,
> Martin
> 
> 
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/ethernet/stmicro/stmmac?id=56311a315da7ebc668dbcc2f1c99689cc10796c4