linux-kernel - Re: [PATCH] net: phy: dp83822: fix transmit amplitude if CONFIG_OF

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Message-ID: <20250316112158.GA4035@debian>
Date: Sun, 16 Mar 2025 12:21:58 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: Gerhard Engleder <gerhard@...leder-embedded.com>
Cc: dimitri.fedrau@...bherr.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <linux@...linux.org.uk>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH] net: phy: dp83822: fix transmit amplitude if
 CONFIG_OF_MDIO not defined

Am Wed, Mar 12, 2025 at 08:53:29PM +0100 schrieb Gerhard Engleder:
> On 12.03.25 18:23, Dimitri Fedrau via B4 Relay wrote:
> > From: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > 
> > When CONFIG_OF_MDIO is not defined the index for selecting the transmit
> > amplitude voltage for 100BASE-TX is set to 0, but it should be -1, if there
> > is no need to modify the transmit amplitude voltage. Add a flag to make
> > sure there is a need to modify it.
> > 
> > Fixes: 4f3735e82d8a ("net: phy: dp83822: Add support for changing the transmit amplitude voltage")
> > Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
> > ---
> >   drivers/net/phy/dp83822.c | 5 ++++-
> >   1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
> > index 3662f3905d5ade8ad933608fcaeabb714a588418..d69000cb0ceff28e8288ba24e0af1c960ea9cc97 100644
> > --- a/drivers/net/phy/dp83822.c
> > +++ b/drivers/net/phy/dp83822.c
> > @@ -201,6 +201,7 @@ struct dp83822_private {
> >   	bool set_gpio2_clk_out;
> >   	u32 gpio2_clk_out;
> >   	bool led_pin_enable[DP83822_MAX_LED_PINS];
> > +	bool tx_amplitude_100base_tx_modify;
> >   	int tx_amplitude_100base_tx_index;
> >   };
> 
> You could instead init tx_amplitude_100base_tx_index in
> dp8382x_probe() to -1.
> 
> But functional it should be ok.
> 
> Reviewed-by: Gerhard Engleder <gerhard@...leder-embedded.com>
>
Hi Gerhard,

will send out an V2 implementing your proposal. Thanks for reviewing.

Best regards,
Dimitri Fedrau