netdev - Re: Regression in KSZ9477 dsa driver - KSZ9567 et al. do not support EEE

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Message-ID: <45135ac1096670794da5b5365f8b22e8f52f47e7.camel@microchip.com>
Date: Tue, 6 Aug 2024 08:12:18 +0000
From: <Arun.Ramadoss@...rochip.com>
To: <o.rempel@...gutronix.de>, <kuba@...nel.org>
CC: <UNGLinuxDriver@...rochip.com>, <Woojung.Huh@...rochip.com>,
	<netdev@...r.kernel.org>, <lukma@...x.de>, <foss@...tin-whitaker.me.uk>
Subject: Re: Regression in KSZ9477 dsa driver - KSZ9567 et al. do not support
 EEE

Hi Oleksij/Martin,

On Tue, 2024-08-06 at 07:08 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> Hi Martin,
> 
> 
> 
> I can confirm it, Microchip officially removed EEE support from the
> datasheets for this chips and extended errata documentations.
> 
> KSZ9567S-Errata-DS80000756.pdf
> Module 4: Energy Efficient Ethernet (EEE) feature select must be
> manually disabled
> 
> KSZ9896C-Errata-DS80000757.pdf
> Module 3: Energy Efficient Ethernet (EEE) feature select must be
> manually disabled
> 
> KSZ9897S-Errata-DS80000759.pdf
> Module 4: Energy Efficient Ethernet (EEE) feature select must be
> manually disabled

KSZ8567 Errata - DS80000753.pdf
Module 4: 100BASE-TX Energy Efficient Ethernet (EEE) is subject to link
drop

KSZ8567 which is derivative product of KSZ9477, also has errata. But
unlikely to others, errata states two options,
1. Have a workaround through registers.
2. Disable EEE.

Atleast, for now with this patch set can include KSZ8567 as well for
disabling EEE. May be in future workaround can be implemented.