lkml.org 
[lkml]   [2017]   [Aug]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH net-next 10/11] net: dsa: mv88e6xxx: remove EEE support
From
Date
On 08/01/2017 10:27 AM, Andrew Lunn wrote:
>> If the MAC does not support EEE but the PHY does I think you can still
>> allow EEE to be advertised and enabled, you just won't have the MAC be
>> able to leverage the power savings that EEE brings. AFAICT this is still
>> a valid mode whereby the PHY is put in a lower power mode, just not the
>> whole transmit path (MAC + PHY).
>
> Hi Florian
>
> I read a couple of datasheets for a few phys doing EEE. Both said the
> same, the MAC has to indicate to the PHY when low power should be
> entered and existed. The PHY itself does not appear to do anything on
> its own.

Oh you are right, the LPI signal has to come from the MAC for the PHY to
decide how to do the idle signaling, my bad.

>
> It would be good to read the standards about this. But i don't think
> we should tell userspace EEE is enabled, if the PHY has it enabled,
> but the MAC is not capable and hence EEE is not actually being used at
> all.
--
Florian

\
 
 \ /
  Last update: 2017-08-01 20:53    [W:0.067 / U:0.756 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site