linux-kernel - Re: [PATCH v3 3/3] net: phy: realtek: Disable clock on suspend

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Message-ID: <086b52d5-4159-ffaf-8bcd-30ac24c25017@gmail.com>
Date:   Mon, 5 Jun 2023 08:27:07 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Detlev Casanova <detlev.casanova@...labora.com>,
        linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org,
        Florian Fainelli <florian.fainelli@...adcom.com>
Subject: Re: [PATCH v3 3/3] net: phy: realtek: Disable clock on suspend

On 6/5/23 08:19, Detlev Casanova wrote:
> For PHYs that call rtl821x_probe() where an external clock can be
> configured, make sure that the clock is disabled
> when ->suspend() is called and enabled on resume.
> 
> The PHY_ALWAYS_CALL_SUSPEND is added to ensure that the suspend function
> is actually always called.
> 
> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> ---
>   drivers/net/phy/realtek.c | 24 ++++++++++++++++++++++--
>   1 file changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index b13dd0b3c99e..62eac4835def 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -426,10 +426,28 @@ static int rtl8211f_config_init(struct phy_device *phydev)
>   	return genphy_soft_reset(phydev);
>   }
>   
> +static int rtl821x_suspend(struct phy_device *phydev)
> +{
> +	struct rtl821x_priv *priv = phydev->priv;
> +	int ret = genphy_suspend(phydev);

Sorry I missed that part, if Wake-on-LAN is enabled you cannot suspend 
the PHY as this will typically prevent it from passing received frames 
up the MAC where Wake-on-LAN can be done. You need to move 
genphy_suspend() into the !phydev->wol_enabled clause.
-- 
Florian