netdev - Re: [PATCH net] net: stmmac: fix MAC WoL unwork if PHY doesn't support WoL

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Date:   Wed, 7 Apr 2021 14:35:18 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, davem@...emloft.net, kuba@...nel.org,
        f.fainelli@...il.com, netdev@...r.kernel.org, linux-imx@....com,
        Jisheng.Zhang@...aptics.com
Subject: Re: [PATCH net] net: stmmac: fix MAC WoL unwork if PHY doesn't
 support WoL

On Wed, Apr 07, 2021 at 06:44:04PM +0800, Joakim Zhang wrote:
> Both get and set WoL will check device_can_wakeup(), if MAC supports
> PMT, it will set device wakeup capability. After commit 1d8e5b0f3f2c ("net:
> stmmac: Support WOL with phy"), device wakeup capability will be
> overwrite in stmmac_init_phy() according to phy's Wol feature. If phy
> doesn't support WoL, then MAC will lose wakeup capability. To fix this
> issue, only overwrite device wakeup capability when MAC doesn't support
> PMT.
> 
> Fixes: commit 1d8e5b0f3f2c ("net: stmmac: Support WOL with phy")
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 208cae344ffa..f46d9c69168f 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1103,7 +1103,9 @@ static int stmmac_init_phy(struct net_device *dev)
>  	}
>  
>  	phylink_ethtool_get_wol(priv->phylink, &wol);
> -	device_set_wakeup_capable(priv->device, !!wol.supported);
> +
> +	if (!priv->plat->pmt)
> +		device_set_wakeup_capable(priv->device, !!wol.supported);
  
It seems like a better fix would be to call stmmac_get_wol(), That
should set wol taking into account both pmt and phy.  But i would also
say stmmac_get_wol() and stmmac_set_wol() are broken. They should
combine capabilities, not be either pmt or phy.

       Andrew