linux-kernel - Re: [PATCH net-next 1/3] net: phy: dp83869: Restart PHY when configuring mode

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Message-ID: <aQnAFxSTyo6SofZ7@shell.armlinux.org.uk>
Date: Tue, 4 Nov 2025 08:57:59 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Romain Gantois <romain.gantois@...tlin.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/3] net: phy: dp83869: Restart PHY when
 configuring mode

On Tue, Nov 04, 2025 at 09:50:34AM +0100, Romain Gantois wrote:
> The DP83869 PHY requires a software restart when the OP_MODE is changed.
> 
> Add this restart in dp83869_configure_mode().
> 
> Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
> ---
>  drivers/net/phy/dp83869.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
> index 1f381d7b13ff..fecacaa83b04 100644
> --- a/drivers/net/phy/dp83869.c
> +++ b/drivers/net/phy/dp83869.c
> @@ -797,6 +797,10 @@ static int dp83869_configure_mode(struct phy_device *phydev,
>  		return -EINVAL;
>  	}
>  
> +	ret = phy_write(phydev, DP83869_CTRL, DP83869_SW_RESTART);

So if dp83869_configure_fiber() returns an error, that doesn't matter?
(This overwrites its error.)

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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