RE: [PATCH net-next 0/3] net: stmmac: Convert to phylink

[Jose Abreu]

From: Andrew Lunn <andrew@xxxxxxx>
Date: Jul/22/2019, 15:19:43 (UTC+00:00)

> On Mon, Jul 22, 2019 at 01:58:20PM +0000, Jose Abreu wrote:
> > From: Andrew Lunn <andrew@xxxxxxx>
> > Date: Jul/22/2019, 14:40:23 (UTC+00:00)
> > 
> > > Does this mean that all stmmac variants support 1G? There are none
> > > which just support Fast Ethernet?
> > 
> > This glue logic drivers sometimes reflect a custom IP that's Synopsys 
> > based but modified by customer, so I can't know before-hand what's the 
> > supported max speed. There are some old versions that don't support 1G 
> > but I expect that PHY driver limits this ...
> 
> If a Fast PHY is used, then yes, it would be limited. But sometimes a
> 1G PHY is used because they are cheaper than a Fast PHY.
>  
> > > I'm also not sure the change fits the problem. Why did it not
> > > negotiate 100FULL rather than 10Half? You are only moving the 1G
> > > speeds around, so 100 speeds should of been advertised and selected.
> > 
> > Hmm, now that I'm looking at it closer I agree with you. Maybe link 
> > partner or PHY doesn't support 100M ?
> 
> In the working case, ethtool shows the link partner supports 10, 100,
> and 1G. So something odd is going on here.
> 
> You fix does seems reasonable, and it has been reported to fix the
> issue, but it would be good to understand what is going on here.

Agreed!

Ondrej, can you please share dmesg log and ethtool output with the fixed 
patch ?

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Thanks,
Jose Miguel Abreu