netdev - Re: DP83867 ethernet PHY regression

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Date: Mon, 22 May 2023 17:35:33 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Andrew Lunn <andrew@...n.ch>
Cc: Francesco Dolcini <francesco@...cini.it>,
	Praneeth Bajjuri <praneeth@...com>, Geet Modi <geet.modi@...com>,
	"David S. Miller" <davem@...emloft.net>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Grygorii Strashko <grygorii.strashko@...com>,
	Dan Murphy <dmurphy@...com>
Subject: Re: DP83867 ethernet PHY regression

On Mon, May 22, 2023 at 05:15:56PM +0200, Andrew Lunn wrote:
> On Mon, May 22, 2023 at 04:58:46PM +0200, Francesco Dolcini wrote:
> > Hello all,
> > commit da9ef50f545f ("net: phy: dp83867: perform soft reset and retain
> > established link") introduces a regression on my TI AM62 based board.
> > 
> > I have a working DTS with Linux TI 5.10 downstream kernel branch, while
> > testing the DTS with v6.4-rc in preparation of sending it to the mailing
> > list I noticed that ethernet is working only on a cold poweron.
> 
> Do you have more details about how it does not work.
> 
> Please could you use:
> 
> mii-tool -vvv ethX

please see the attached files:

working_da9ef50f545f_reverted.txt
  this is on a v6.4-rc, with da9ef50f545f reverted

not_working.txt
  v6.4-rc not working

working.txt
  v6.4-rc working


It looks like, even on cold boot, it's not working in a reliable way.
Not sure the exact difference when it's working and when it's not.

> in both the good and bad state. The register values might give us a
> clue.

Thanks for your help,
Francesco


View attachment "not_working.txt" of type "text/plain" (676 bytes)

View attachment "working_da9ef50f545f_reverted.txt" of type "text/plain" (676 bytes)

View attachment "working.txt" of type "text/plain" (677 bytes)