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

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Date:	Wed, 8 Jun 2016 15:25:38 -0700
From:	Vincent Palatin <vpalatin@...omium.org>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:	netdev@...r.kernel.org, LKML <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

On Tue, Jun 7, 2016 at 12:23 AM, Giuseppe CAVALLARO
<peppe.cavallaro@...com> wrote:
> 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.

I'm not sure I understand :
you mean that this path is not called if WoL is enabled ?
[ currently stmmac_pltfr_suspend() is calling priv->plat->exit() which
is the rk_gmac_exit() code I'm modifying ]
or the RK driver code should not power down the phy in its exit() callback ?


>> 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);
>>  }
>>
>