netdev - [PATCH net-next 0/2] net: phy: improve PHY suspend/resume

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Message-ID: <a5785ac2-7522-7b9a-7412-f864929ce6db@gmail.com>
Date:   Wed, 23 May 2018 21:28:43 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next 0/2] net: phy: improve PHY suspend/resume

I have the issue that suspending the MAC-integrated PHY gives an
error during system suspend. The sequence is:

1. unconnected PHY/MAC are runtime-suspended already
2. system suspend commences
3. mdio_bus_phy_suspend is called
4. suspend callback of the network driver is called (implicitly
   MAC/PHY are runtime-resumed before)
5. suspend callback suspends MAC/PHY

The problem occurs in step 3. phy_suspend() fails because the MDIO
bus isn't accessible due to the chip being runtime-suspended.

This series mainly adds a check to not suspend the PHY if the
MDIO bus parent is runtime-suspended.

Heiner Kallweit (2):
  net: phy: improve check for when to call phy_resume in mdio_bus_phy_resume
  net: phy: improve checks when to suspend the PHY

 drivers/net/phy/phy_device.c | 45 +++++++++++++++++++++---------------
 1 file changed, 26 insertions(+), 19 deletions(-)

-- 
2.17.0