netdev - Re: [net] net: usb: smsc95xx: fix external PHY reset

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Date:   Mon, 14 Nov 2022 14:43:22 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Alexandru Tachici <alexandru.tachici@...log.com>,
        linux-kernel@...r.kernel.org
Cc:     andrew@...n.ch, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, steve.glendinning@...well.net,
        UNGLinuxDriver@...rochip.com, andre.edich@...rochip.com,
        linux-usb@...r.kernel.org
Subject: Re: [net] net: usb: smsc95xx: fix external PHY reset

Hello!

On 11/14/22 4:16 PM, Alexandru Tachici wrote:

> An external PHY needs settling time after power up or reser.

   Reset? :-)

> In the bind() function an mdio bus is registered. If at this point
> the external PHY is still initialising, no valid PHY ID will be
> read and on phy_find_first() the bind() function will fail.
> 
> If an external PHY is present, wait the maximum time specified
> in 802.3 45.2.7.1.1.
> 
> Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support")
> Signed-off-by: Alexandru Tachici <alexandru.tachici@...log.com>

[...]

MBR, Sergey