net: phy: broadcom: Add IDDQ-SR mode

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Add support for putting the PHY into IDDQ Soft Recovery mode by setting
the TOP_MISC register bits accordingly. This requires us to implement a
custom bcm54xx_suspend() routine which diverges from genphy_suspend() in
order to configure the PHY to enter IDDQ with software recovery as well
as avoid doing a read/modify/write on the BMCR register.

Doing a read/modify/write on the BMCR register means that the
auto-negotation bit may remain which interferes with the ability to put
the PHY into IDDQ-SR mode. We do software reset upon suspend in order to
put the PHY back into its state prior to suspend as recommended by the
datasheet.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Florian Fainelli 2021-09-20 14:54:14 -07:00 • committed by David S. Miller

parent c595b120eb

commit d6da08ed14

2 changed files with 59 additions and 0 deletions

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51

drivers/net/phy/broadcom.c

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8

include/linux/brcmphy.h

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