linux-kernel - Re: [PATCH v3 1/2] net: phy: at803x: fix the wol setting functions

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Date:   Wed, 2 Aug 2023 17:50:41 +0800
From:   Jie Luo <quic_luoj@...cinc.com>
To:     Paolo Abeni <pabeni@...hat.com>, Leo Li <leoyang.li@....com>,
        Andrew Lunn <andrew@...n.ch>
CC:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        David Bauer <mail@...id-bauer.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Viorel Suman <viorel.suman@....com>,
        Wei Fang <wei.fang@....com>
Subject: Re: [PATCH v3 1/2] net: phy: at803x: fix the wol setting functions



On 8/1/2023 5:16 PM, Paolo Abeni wrote:
> On Mon, 2023-07-31 at 14:58 +0000, Leo Li wrote:
>>> -----Original Message-----
>>> From: Andrew Lunn <andrew@...n.ch>
>>> Sent: Saturday, July 29, 2023 3:14 AM
>>> To: Leo Li <leoyang.li@....com>
>>> Cc: Heiner Kallweit <hkallweit1@...il.com>; Russell King
>>> <linux@...linux.org.uk>; David S . Miller <davem@...emloft.net>; Jakub
>>> Kicinski <kuba@...nel.org>; 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 v3 1/2] net: phy: at803x: fix the wol setting functions
>>>
>>> On Fri, Jul 28, 2023 at 04:53:19PM -0500, Li Yang wrote:
>>>> In commit 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.
>>>
>>> Do chips which do not have the 1588 register not have WoL? Or WoL
>>> hardware is always enabled, but you still need to enable the interrupt.
>>
>> Some of them do and some don't, which is removed in the other patch
>> from the series.  Since I don't find the register to enable it, I
>> guess it always enabled.
>>
>>>
>>> Have you tested on a range of PHY? It might be better to split this patch up a
>>> bit. If it causes regressions, having smaller patches can make it easier to find
>>> which change broken it.
>>
>> No, I only have AR8035 to test with.  Changes for other chips are
>> according to the datasheet.  It would be good if others having the
>> hardware can test it too.
> 
> Adding Luo Jie for awareness.
> 
> @Luo Jie: do you have access to other chips handled by this driver
> other then AR8035? could you please test this series:
> 
> https://patchwork.kernel.org/project/netdevbpf/list/?series=770734
> 
> ?
> 
> Thanks!
> 
> Paolo
> 

Hi Paolo & Leo,
To make WoL feature working, we need to enable bit 
MDIO_MMD_PCS.AT803X_PHY_MMD3_WOL_CTRL.AT803X_WOL_EN on both PHY
qca8081 and at803x, which does not depend on the 1588 feature.

The bit AT803X_INTR_ENABLE.AT803X_INTR_ENABLE_WOL is just for triggering 
the external WoL interrupt PIN when the WOL interrupt occurs.

Thanks,
Jie