linux-kernel - Re: [PATCH v2] net: phy: dp83867: perform soft reset and retain established link

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Date:   Thu, 10 Jun 2021 07:53:46 +0200
From:   Johannes Pointner <h4nn35.work@...il.com>
To:     praneeth@...com, Geet Modi <geet.modi@...com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: phy: dp83867: perform soft reset and retain
 established link

Hello,

On Thu, Jun 10, 2021 at 6:10 AM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Wed, Jun 09, 2021 at 07:43:42PM -0500, praneeth@...com wrote:
> > From: Praneeth Bajjuri <praneeth@...com>
> >
> > Current logic is performing hard reset and causing the programmed
> > registers to be wiped out.
> >
> > as per datasheet: https://www.ti.com/lit/ds/symlink/dp83867cr.pdf
> > 8.6.26 Control Register (CTRL)
> >
> > do SW_RESTART to perform a reset not including the registers,
> > If performed when link is already present,
> > it will drop the link and trigger re-auto negotiation.
> >
> > Signed-off-by: Praneeth Bajjuri <praneeth@...com>
> > Signed-off-by: Geet Modi <geet.modi@...com>
>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
>
>     Andrew

I reported a few days ago an issue with the DP83822 which I think is
caused by a similar change.
https://lore.kernel.org/netdev/CAHvQdo2yzJC89K74c_CZFjPydDQ5i22w36XPR5tKVv_W8a2vcg@mail.gmail.com/
In my case I can't get an link after this change, reverting it fixes
the problem for me.

Hannes