linux-kernel - Re: [PATCH v2 1/2] net: phylink: init phydev on phylink

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Date:   Mon, 12 Dec 2022 12:47:09 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     nicolas.ferre@...rochip.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        andrew@...n.ch, hkallweit1@...il.com, sergiu.moga@...rochip.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] net: phylink: init phydev on phylink_resume()

On Mon, Dec 12, 2022 at 01:28:44PM +0200, Claudiu Beznea wrote:
> There are scenarios where PHY power is cut off on system suspend.
> There are also MAC drivers which handles themselves the PHY on
> suspend/resume path. For such drivers the
> struct phy_device::mac_managed_phy is set to true and thus the
> mdio_bus_phy_suspend()/mdio_bus_phy_resume() wouldn't do the
> proper PHY suspend/resume. For such scenarios call phy_init_hw()
> from phylink_resume().
> 
> Suggested-by: Russell King (Oracle) <linux@...linux.org.uk>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---
> 
> Hi, Russel,
> 
> I let phy_init_hw() to execute for all devices. I can restrict it only
> for PHYs that has struct phy_device::mac_managed_phy = true.
> 
> Please let me know what you think.

I think it would be better to only do this in the path where we call
phy_start() - if we do it in the WoL path (where the PHY remains
running), then there is no phy_start() call, so phy_init_hw() could
result in the PHY not working after a suspend/resume event.

-- 
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