netdev - Re: [PATCH] net: phy: at803x: Improve hibernation support on start up

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Date: Thu, 14 Dec 2023 11:46:22 +0100
From: Marek Vasut <marex@...x.de>
To: Romain Gantois <romain.gantois@...tlin.com>,
 "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, Wei Fang <wei.fang@....com>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 "David S. Miller" <davem@...emloft.net>, Andrew Lunn <andrew@...n.ch>,
 Eric Dumazet <edumazet@...gle.com>, Heiner Kallweit <hkallweit1@...il.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 kernel@...gutronix.de, linux-clk@...r.kernel.org,
 Stephen Boyd <sboyd@...nel.org>, Michael Turquette <mturquette@...libre.com>
Subject: Re: [PATCH] net: phy: at803x: Improve hibernation support on start up

On 12/14/23 09:13, Romain Gantois wrote:
> 
> Hello Russell,
> 
> On Thu, 10 Aug 2023, Russell King (Oracle) wrote:
> 
>>> We've had these issues before with stmmac, so this "stmmac needs the
>>> PHY receive clock" is nothing new - it's had problems with system
>>> suspend/resume in the past, and I've made suggestions... and when
>>> there's been two people trying to work on it, I've attempted to get
>>> them to talk to each other which resulted in nothing further
>>> happening.
>>>
>>> Another solution could possibly be that we reserve bit 30 on the
>>> PHY dev_flags to indicate that the receive clock must always be
>>> provided. I suspect that would have an advantage in another
>> ...
>>
>> Something like this for starters:
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> ...
> 
> I've implemented and tested the general-case solution you proposed to this
> receive clock issue with stmmac drivers. The core of your suggestion is pretty
> much unchanged, I just added a phylink_pcs flag for standalone PCS drivers that
> also need to provide the receive clock.
> 
> I'd like to send a series for this upstream, which would allow solving this
> issue for both the DWMAC RZN1 case and the AT803x PHY suspend/hibernate case
> (and also potentially other cases with a similar bug).
> 
> I wanted to ask you how you would prefer to be credited in my patch series. I
> was considering putting you as author and first signer of the initial patch
> adding the phy_dev flag. Would that be okay or would you prefer something else?

Credit it whichever way you see fit, don't worry, better focus on the 
fix. I can test the result on MX8MM/MX8MP, so feel free to CC me on that.