netdev - Re: [PATCH] net: phy: micrel: reconfigure the phy on resume

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Message-ID: <74922e53-e521-fde3-050a-64dd6bb507fd@microchip.com>
Date:   Thu, 11 Feb 2021 11:18:10 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <hkallweit1@...il.com>, <linux@...linux.org.uk>,
        <rjw@...ysocki.net>, <pavel@....cz>
CC:     <andrew@...n.ch>, <davem@...emloft.net>, <kuba@...nel.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] net: phy: micrel: reconfigure the phy on resume

Hi, Rafael, Pavel,

I know you may be busy. Just a gentle ping on this topic. It would be nice
to have your input in this.

Thank you,
Claudiu Beznea

On 14.01.2021 13:05, Heiner Kallweit wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 14.01.2021 11:41, Claudiu.Beznea@...rochip.com wrote:
>>
>>
>> On 14.01.2021 12:25, Russell King - ARM Linux admin wrote:
>>>
>>> As I've said, if phylib/PHY driver is not restoring the state of the
>>> PHY on resume from suspend-to-ram, then that's an issue with phylib
>>> and/or the phy driver.
>>
>> In the patch I proposed in this thread the restoring is done in PHY driver.
>> Do you think I should continue the investigation and check if something
>> should be done from the phylib itself?
>>
> It was the right move to approach the PM maintainers to clarify whether
> the resume PM callback has to assume that power had been cut off and
> it has to completely reconfigure the device. If they confirm this
> understanding, then:
> - the general question remains why there's separate resume and restore
>   callbacks, and what restore is supposed to do that resume doesn't
>   have to do
> - it should be sufficient to use mdio_bus_phy_restore also as resume
>   callback (instead of changing each and every PHY driver's resume),
>   because we can expect that somebody cutting off power to the PHY
>   properly suspends the MDIO bus before
> 
>> Thank you,
>> Claudiu Beznea
>>
>>>
>>> --
>>> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
>>> FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
>