net: phy: fix resume handling

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When a PHY has the BMCR_PDOWN bit set, it may decide to ignore writes
to other registers, or reset the registers to power-on defaults.
Micrel PHYs do this for their interrupt registers.

The current structure of phylib tries to enable interrupts before
resuming (and releasing) the BMCR_PDOWN bit.  This fails, causing
Micrel PHYs to stop working after a suspend/resume sequence if they
are using interrupts.

Fix this by ensuring that the PHY driver resume methods do not take
the phydev->lock mutex themselves, but the callers of phy_resume()
take that lock.  This then allows us to move the call to phy_resume()
before we enable interrupts in phy_start().

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Russell King 2017-12-12 10:45:36 +00:00 • committed by David S. Miller

parent cd8165c3d5

commit f5e64032a7

3 changed files with 9 additions and 14 deletions

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4

drivers/net/phy/at803x.c

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9

drivers/net/phy/phy.c

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10

drivers/net/phy/phy_device.c

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