linux-kernel - Re: [PATCH net v2 1/1] net: dsa: microchip: make sure drive strength configuration is not lost by soft reset

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Message-ID: <ZegHO_PqO-3qwFMQ@pengutronix.de>
Date: Wed, 6 Mar 2024 07:03:39 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Arun.Ramadoss@...rochip.com
Cc: kuba@...nel.org, andrew@...n.ch, kernel@...gutronix.de,
	olteanv@...il.com, davem@...emloft.net, Woojung.Huh@...rochip.com,
	linux-kernel@...r.kernel.org, pabeni@...hat.com,
	f.fainelli@...il.com, edumazet@...gle.com, netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net v2 1/1] net: dsa: microchip: make sure drive strength
 configuration is not lost by soft reset

On Wed, Mar 06, 2024 at 03:29:32AM +0000, Arun.Ramadoss@...rochip.com wrote:
> Hi Jakub,
> 
> On Tue, 2024-03-05 at 19:14 -0800, Jakub Kicinski wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > know the content is safe
> > 
> > On Tue,  5 Mar 2024 07:48:02 +0100 Oleksij Rempel wrote:
> > > This driver has two separate reset sequence in different places:
> > > - gpio/HW reset on start of ksz_switch_register()
> > > - SW reset on start of ksz_setup()
> > > 
> > > The second one will overwrite drive strength configuration made in
> > > the
> > > ksz_switch_register().
> > > 
> > > To fix it, move ksz_parse_drive_strength() from
> > > ksz_switch_register() to
> > > ksz_setup().
> > > 
> > > Fixes: d67d7247f641 ("net: dsa: microchip: Add drive strength
> > > configuration")
> > > Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> > 
> > Hm, this is much larger than I anticipated, and also doesn't apply,
> > so there will be conflict with -next. Andrew, should we go back to
> > the v1?
> 
> Suggestion: Instead of moving ksz_parse_drive_strength() from end of
> file to above, can we move ksz_setup() & ksz_teardown() down. So that
> the changes will be minimal. Will that work?

This will make it hard portable to stable too. As alternative I can
offer to use v1 patch for stable and send bigger patch for next after
in the next net-next window.

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