1PHY_POLL_RESET(9)           Network device support           PHY_POLL_RESET(9)
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NAME

6       phy_poll_reset - Safely wait until a PHY reset has properly completed
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SYNOPSIS

9       int phy_poll_reset(struct phy_device * phydev);
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ARGUMENTS

12       phydev
13           The PHY device to poll
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DESCRIPTION

16       According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as published
17       in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR register
18       must be polled until the BMCR_RESET bit clears.
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20       Furthermore, any attempts to write to PHY registers may have no effect
21       or even generate MDIO bus errors until this is complete.
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23       Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
24       standard and do not fully reset after the BMCR_RESET bit is set, and
25       may even *REQUIRE* a soft-reset to properly restart autonegotiation. In
26       an effort to support such broken PHYs, this function is separate from
27       the standard phy_init_hw which will zero all the other bits in the BMCR
28       and reapply all driver-specific and board-specific fixups.
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31Kernel Hackers Manual 3.10         June 2019                 PHY_POLL_RESET(9)
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