netdev - Re: [PATCH net v1 1/1] net: dsa: microchip: make sure drive strength configuration is not lost by soft reset

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Message-ID: <ZeXxr1qZ0ZP4U--O@pengutronix.de>
Date: Mon, 4 Mar 2024 17:07:11 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Arun.Ramadoss@...rochip.com
Cc: andrew@...n.ch, olteanv@...il.com, davem@...emloft.net,
	Woojung.Huh@...rochip.com, pabeni@...hat.com, edumazet@...gle.com,
	f.fainelli@...il.com, kuba@...nel.org, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net v1 1/1] net: dsa: microchip: make sure drive strength
 configuration is not lost by soft reset

Hi Arun,

On Mon, Mar 04, 2024 at 02:25:54PM +0000, Arun.Ramadoss@...rochip.com wrote:
> Hi Oleksij,
> 
> On Mon, 2024-03-04 at 14:56 +0100, Oleksij Rempel wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > know the content is safe
> > 
> > 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>
> > ---
> >  drivers/net/dsa/microchip/ksz_common.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/net/dsa/microchip/ksz_common.c
> > b/drivers/net/dsa/microchip/ksz_common.c
> > index d58cc685478b1..83a5936506059 100644
> > --- a/drivers/net/dsa/microchip/ksz_common.c
> > +++ b/drivers/net/dsa/microchip/ksz_common.c
> > @@ -2260,6 +2260,8 @@ static int ksz_pirq_setup(struct ksz_device
> > *dev, u8 p)
> >         return ksz_irq_common_setup(dev, pirq);
> >  }
> > 
> > +static int ksz_parse_drive_strength(struct ksz_device *dev);
> > +
> 
> IMO: move the ksz_parse_drive_strength( ) here instead of prototype
> alone. Since the function is used in only one place and it will be
> logical to follow. 

I fully agree, but I fear this change would be too big for stable.

@Jakub, what is your preference?

Regards,
Oleksij
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