From: Heiner Kallweit <hkallweit1@gmail.com>
To: Joakim Zhang <qiangqing.zhang@nxp.com>,
Andrew Lunn <andrew@lunn.ch>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
Jakub Kicinski <kuba@kernel.org>,
David Miller <davem@davemloft.net>,
Fugang Duan <fugang.duan@nxp.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next 2/3] net: fec: use mac-managed PHY PM
Date: Thu, 8 Apr 2021 07:59:30 +0200 [thread overview]
Message-ID: <d47a3d9f-a9cf-4765-9ee8-19ebb9155150@gmail.com> (raw)
In-Reply-To: <DB8PR04MB679540FF95A7B05931830A30E6749@DB8PR04MB6795.eurprd04.prod.outlook.com>
On 08.04.2021 07:45, Joakim Zhang wrote:
>
>> -----Original Message-----
>> From: Heiner Kallweit <hkallweit1@gmail.com>
>> Sent: 2021年4月7日 23:53
>> To: Andrew Lunn <andrew@lunn.ch>; Russell King - ARM Linux
>> <linux@armlinux.org.uk>; Jakub Kicinski <kuba@kernel.org>; David Miller
>> <davem@davemloft.net>; Fugang Duan <fugang.duan@nxp.com>
>> Cc: netdev@vger.kernel.org; Joakim Zhang <qiangqing.zhang@nxp.com>
>> Subject: [PATCH net-next 2/3] net: fec: use mac-managed PHY PM
>>
>> Use the new mac_managed_pm flag to work around an issue with KSZ8081
>> PHY that becomes unstable when a soft reset is triggered during aneg.
>>
>> Reported-by: Joakim Zhang <qiangqing.zhang@nxp.com>
>> Tested-by: Joakim Zhang <qiangqing.zhang@nxp.com>
>> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
>> ---
>> drivers/net/ethernet/freescale/fec_main.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/freescale/fec_main.c
>> b/drivers/net/ethernet/freescale/fec_main.c
>> index 3db882322..70aea9c27 100644
>> --- a/drivers/net/ethernet/freescale/fec_main.c
>> +++ b/drivers/net/ethernet/freescale/fec_main.c
>> @@ -2048,6 +2048,8 @@ static int fec_enet_mii_probe(struct net_device
>> *ndev)
>> fep->link = 0;
>> fep->full_duplex = 0;
>>
>> + phy_dev->mac_managed_pm = 1;
>> +
>> phy_attached_info(phy_dev);
>>
>> return 0;
>> @@ -3864,6 +3866,7 @@ static int __maybe_unused fec_resume(struct
>> device *dev)
>> netif_device_attach(ndev);
>> netif_tx_unlock_bh(ndev);
>> napi_enable(&fep->napi);
>> + phy_init_hw(ndev->phydev);
>
>
> For now, I think we doesn't need to re-initialize PHY after MAC resume back, it also can be done by PHY driver if it needed.
>
The PHY PM resume callback (that used to call phy_init_hw) is a no-op now.
So we have to call it from the MAC resume callback. Power to the PHY may be
off during system suspend, therefore it may be reset to power-on defaults.
That's why phy_init_hw() should be called, that includes calling the
PHY drivers config_init callback.
> Best Regards,
> Joakim Zhang
>> phy_start(ndev->phydev);
>> }
>> rtnl_unlock();
>> --
>> 2.31.1
>>
>
next prev parent reply other threads:[~2021-04-08 5:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 15:50 [PATCH net-next 0/3] net: make PHY PM ops a no-op if MAC driver manages PHY PM Heiner Kallweit
2021-04-07 15:51 ` [PATCH net-next 1/3] net: phy: " Heiner Kallweit
2021-04-07 15:52 ` [PATCH net-next 2/3] net: fec: use mac-managed " Heiner Kallweit
2021-04-08 5:45 ` Joakim Zhang
2021-04-08 5:59 ` Heiner Kallweit [this message]
2021-04-08 6:21 ` Joakim Zhang
2021-04-07 15:53 ` [PATCH net-next 3/3] r8169: " Heiner Kallweit
2021-04-08 5:42 ` [PATCH net-next 0/3] net: make PHY PM ops a no-op if MAC driver manages " Joakim Zhang
2021-04-08 9:02 ` Heiner Kallweit
2021-04-09 9:23 ` Heiner Kallweit
2021-04-10 1:13 ` Jakub Kicinski
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