netdev - Re: [PATCH] net: stmmac: dwmac-rk: keep PHY up for WoL

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Date:	Tue, 7 Jun 2016 09:23:09 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	Vincent Palatin <vpalatin@...omium.org>, <netdev@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>,
	Alexandre Torgue <alexandre.torgue@...com>,
	Heiko Stübner <heiko@...ech.de>
Subject: Re: [PATCH] net: stmmac: dwmac-rk: keep PHY up for WoL

Hello

On 6/3/2016 7:29 PM, Vincent Palatin wrote:
> Do not shutdown the PHY if Wake-on-Lan is enabled, else it cannot wake
> us up.
>

I do not understand why you need that.
This is done inside the PHY layer and it is tested on our platforms
he idea is: If the parent wants to Wake the system then the PHY should
not power-down.

Peppe

> Signed-off-by: Vincent Palatin <vpalatin@...omium.org>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> index 0cd3ecf..2e45e75 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> @@ -534,6 +534,10 @@ static int rk_gmac_init(struct platform_device *pdev, void *priv)
>  	struct rk_priv_data *bsp_priv = priv;
>  	int ret;
>
> +	/* Keep the PHY up if we use Wake-on-Lan. */
> +	if (device_may_wakeup(&pdev->dev))
> +		return 0;
> +
>  	ret = phy_power_on(bsp_priv, true);
>  	if (ret)
>  		return ret;
> @@ -549,6 +553,10 @@ static void rk_gmac_exit(struct platform_device *pdev, void *priv)
>  {
>  	struct rk_priv_data *gmac = priv;
>
> +	/* The PHY was up for Wake-on-Lan. */
> +	if (device_may_wakeup(&pdev->dev))
> +		return;
> +
>  	phy_power_on(gmac, false);
>  	gmac_clk_enable(gmac, false);
>  }
>