linux-kernel - Re: [PATCH V3 1/2] net: phylink: add a function to resume phy alone to fix resume issue with WoL enabled

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Message-ID: <152ee4d9-800e-545a-c2c6-08b03e9d1301@bootlin.com>
Date:   Thu, 10 Aug 2023 18:10:04 +0200
From:   Alexis Lothoré <alexis.lothore@...tlin.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        Clark Wang <xiaoning.wang@....com>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH V3 1/2] net: phylink: add a function to resume phy alone
 to fix resume issue with WoL enabled

Hello Clark, Russell,

On 2/23/23 12:06, Russell King (Oracle) wrote:
> On Thu, Feb 23, 2023 at 10:27:06AM +0000, Clark Wang wrote:
>> Hi Russel,
>>
>> I have sent the V4 patch set yesterday.
>> You can check it from: https://lore.kernel.org/linux-arm-kernel/20230222092636.1984847-2-xiaoning.wang@nxp.com/T/
>>
> 
> Ah yes, sent while net-next is closed.
> 
> Have you had any contact with Clément Léger ? If not, please can you
> reach out to Clément, because he has virtually the same problem. I
> don't want to end up with a load of different fixes in the mainline
> kernel for the same "we need the PHY clock enabled on stmmac" problem
> from different people.

I am resuming Clement's initial efforts on RZN1 GMAC interface, which indeed is
in need of an early PCS initialization mechanism too ([1]).

> Please try to come up with one patch set between you both to fix this.
> 
> (effectively, that's a temporary NAK on your series.)>

I would like to know if this series is still ongoing/alive ? I have checked for
follow-ups after V4 sent by Clark ([2]), but did not find anything. Clement
handed me over the topic right when Russell suggested to discuss this shared
need, so I am not sure if any mutualization discussion has happened yet ?

If not, what would be the next steps ? Based on my understanding and comments on
the [2] v3, I feel that Clark's series would be a good starting point. In order
to be able to use it in both series, we could possibly make it less specific to
the "resume" mechanism (basically, phylink_phy_resume() =>
phylink_phy_early_start() ) ? It would then prevent [1] from moving the whole
phylink_start() in stmmac_main too early (see issue raised by Russell) and allow
to just call phylink_phy_early_start() early enough, while still being usable in
the resume scenario raised by Clark. Or am I missing bigger issues with current
series ?

Regards,
Alexis

[1]
https://lore.kernel.org/linux-arm-kernel/20230116103926.276869-1-clement.leger@bootlin.com/
[2] https://lore.kernel.org/all/20230222092636.1984847-1-xiaoning.wang@nxp.com/
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com