netdev - RE: [PATCH net 1/2] net:usb:lan78xx: fix accessing the LAN7800's internal phy specific registers from the MAC driver

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Date:   Thu, 16 Feb 2023 15:20:33 +0000
From:   <Yuiko.Oshino@...rochip.com>
To:     <andrew@...n.ch>
CC:     <enguerrand.de-ribaucourt@...oirfairelinux.com>,
        <Woojung.Huh@...rochip.com>, <hkallweit1@...il.com>,
        <netdev@...r.kernel.org>, <pabeni@...hat.com>,
        <davem@...emloft.net>, <UNGLinuxDriver@...rochip.com>,
        <linux@...linux.org.uk>, <edumazet@...gle.com>,
        <linux-usb@...r.kernel.org>, <kuba@...nel.org>
Subject: RE: [PATCH net 1/2] net:usb:lan78xx: fix accessing the LAN7800's
 internal phy specific registers from the MAC driver

>-----Original Message-----
>From: Andrew Lunn <andrew@...n.ch>
>Sent: Thursday, February 16, 2023 10:09 AM
>To: Yuiko Oshino - C18177 <Yuiko.Oshino@...rochip.com>
>Cc: enguerrand.de-ribaucourt@...oirfairelinux.com; Woojung Huh - C21699
><Woojung.Huh@...rochip.com>; hkallweit1@...il.com; netdev@...r.kernel.org;
>pabeni@...hat.com; davem@...emloft.net; UNGLinuxDriver
><UNGLinuxDriver@...rochip.com>; linux@...linux.org.uk;
>edumazet@...gle.com; linux-usb@...r.kernel.org; kuba@...nel.org
>Subject: Re: [PATCH net 1/2] net:usb:lan78xx: fix accessing the LAN7800's
>internal phy specific registers from the MAC driver
>
>EXTERNAL EMAIL: Do not click links or open attachments unless you know the
>content is safe
>
>On Thu, Feb 16, 2023 at 07:20:53AM -0700, Yuiko Oshino wrote:
>> Move the LAN7800 internal phy (phy ID  0x0007c132) specific register accesses
>to the phy driver (microchip.c).
>>
>> Fixes: 14437e3fa284f465dbbc8611fd4331ca8d60e986 ("lan78xx: workaround
>> of forced 100 Full/Half duplex mode error")
>
>I would not say this is a fix which needs putting into stable. The architecture is
>wrong to do it in the MAC driver, but i don't think it causes real issues?
>
>So please submit this to net-next, not net.
>
>   Andrew

Hi Andrew,

Enguerrand reported the below on 20 Dec 2022, therefore, submitting to net.

" Some operations during the cable switch workaround modify the register
LAN88XX_INT_MASK of the PHY. However, this register is specific to the
LAN8835 PHY. For instance, if a DP8322I PHY is connected to the LAN7801,
that register (0x19), corresponds to the LED and MAC address
configuration, resulting in unapropriate behavior."

Thank you.
Yuiko