netdev - Re: [PATCH RESEND v2 1/2] net: phy: at803x: fix the wol setting functions

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Message-ID: <20230303172847.202fa96e@kernel.org>
Date:   Fri, 3 Mar 2023 17:28:47 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Li Yang <leoyang.li@....com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        David Bauer <mail@...id-bauer.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Viorel Suman <viorel.suman@....com>,
        Wei Fang <wei.fang@....com>
Subject: Re: [PATCH RESEND v2 1/2] net: phy: at803x: fix the wol setting
 functions

On Tue, 28 Feb 2023 21:01:25 -0600 Li Yang wrote:
> In 7beecaf7d507 ("net: phy: at803x: improve the WOL feature"), it seems
> not correct to use a wol_en bit in a 1588 Control Register which is only
> available on AR8031/AR8033(share the same phy_id) to determine if WoL is
> enabled.  Change it back to use AT803X_INTR_ENABLE_WOL for determining
> the WoL status which is applicable on all chips supporting wol. Also
> update the at803x_set_wol() function to only update the 1588 register on
> chips having it.  After this change, disabling wol at probe from
> d7cd5e06c9dd ("net: phy: at803x: disable WOL at probe") is no longer
> needed.  So that part is removed.
> 
> Fixes: 7beecaf7d507b ("net: phy: at803x: improve the WOL feature")

Given the fixes tag Luo Jie <luoj@...eaurora.org> should be CCed.

> Signed-off-by: Li Yang <leoyang.li@....com>
> Reviewed-by: Viorel Suman <viorel.suman@....com>
> Reviewed-by: Wei Fang <wei.fang@....com>
> ---
>  drivers/net/phy/at803x.c | 40 ++++++++++++++++------------------------
>  1 file changed, 16 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index 22f4458274aa..2102279b3964 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -461,21 +461,25 @@ static int at803x_set_wol(struct phy_device *phydev,
>  			phy_write_mmd(phydev, MDIO_MMD_PCS, offsets[i],
>  				      mac[(i * 2) + 1] | (mac[(i * 2)] << 8));
>  
> -		/* Enable WOL function */
> -		ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, AT803X_PHY_MMD3_WOL_CTRL,
> -				0, AT803X_WOL_EN);
> -		if (ret)
> -			return ret;
> +		/* Enable WOL function for 1588 */
> +		if (phydev->drv->phy_id == ATH8031_PHY_ID) {
> +			ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, AT803X_PHY_MMD3_WOL_CTRL,

This line is now too long, unless there is a good reason please stick
to the 80 char maximum.

> +					0, AT803X_WOL_EN);

while at it please fix the alignment, the continuation line should start
under phydev (checkpatch will tell you)

> +			if (ret)
> +				return ret;
> +		}
>  		/* Enable WOL interrupt */
>  		ret = phy_modify(phydev, AT803X_INTR_ENABLE, 0, AT803X_INTR_ENABLE_WOL);
>  		if (ret)
>  			return ret;
>  	} else {
> -		/* Disable WoL function */
> -		ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, AT803X_PHY_MMD3_WOL_CTRL,
> -				AT803X_WOL_EN, 0);
> -		if (ret)
> -			return ret;
> +		/* Disable WoL function for 1588 */
> +		if (phydev->drv->phy_id == ATH8031_PHY_ID) {
> +			ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, AT803X_PHY_MMD3_WOL_CTRL,
> +					AT803X_WOL_EN, 0);

same comments as above

> +			if (ret)
> +				return ret;
> +		}
>  		/* Disable WOL interrupt */
>  		ret = phy_modify(phydev, AT803X_INTR_ENABLE, AT803X_INTR_ENABLE_WOL, 0);
>  		if (ret)
> @@ -510,11 +514,8 @@ static void at803x_get_wol(struct phy_device *phydev,
>  	wol->supported = WAKE_MAGIC;
>  	wol->wolopts = 0;
>  
> -	value = phy_read_mmd(phydev, MDIO_MMD_PCS, AT803X_PHY_MMD3_WOL_CTRL);
> -	if (value < 0)
> -		return;
> -
> -	if (value & AT803X_WOL_EN)
> +	value = phy_read(phydev, AT803X_INTR_ENABLE);

Does phy_read() never fail? Why remove the error checking?

> +	if (value & AT803X_INTR_ENABLE_WOL)
>  		wol->wolopts |= WAKE_MAGIC;
>  }
>