netdev - [PATCH net-next 0/3] net: make PHY PM ops a no-op if MAC driver manages PHY PM

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Message-ID: <9e695411-ab1d-34fe-8b90-3e8192ab84f6@gmail.com>
Date:   Wed, 7 Apr 2021 17:50:46 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Fugang Duan <fugang.duan@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joakim Zhang <qiangqing.zhang@....com>
Subject: [PATCH net-next 0/3] net: make PHY PM ops a no-op if MAC driver
 manages PHY PM

Resume callback of the PHY driver is called after the one for the MAC
driver. The PHY driver resume callback calls phy_init_hw(), and this is
potentially problematic if the MAC driver calls phy_start() in its resume
callback. One issue was reported with the fec driver and a KSZ8081 PHY
which seems to become unstable if a soft reset is triggered during aneg.

The new flag allows MAC drivers to indicate that they take care of
suspending/resuming the PHY. Then the MAC PM callbacks can handle
any dependency between MAC and PHY PM.

Heiner Kallweit (3):
  net: phy: make PHY PM ops a no-op if MAC driver manages PHY PM
  net: fec: use mac-managed PHY PM
  r8169: use mac-managed PHY PM

 drivers/net/ethernet/freescale/fec_main.c | 3 +++
 drivers/net/ethernet/realtek/r8169_main.c | 3 +++
 drivers/net/phy/phy_device.c              | 6 ++++++
 include/linux/phy.h                       | 2 ++
 4 files changed, 14 insertions(+)

-- 
2.31.1