Re: [PATCH v2 1/2] net: phylink: init phydev on phylink_resume()

[Russell King (Oracle)]

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@xxxxxxxxxxxxxxx>
> Signed-off-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
> ---
> 
> 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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