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Alexander Dahl d8b726ee9d net: phy: adin1100: Fix software power-down ready condition 
[ Upstream commit bccaf1fe08 ]

Value CRSM_SFT_PD written to Software Power-Down Control Register
(CRSM_SFT_PD_CNTRL) is 0x01 and therefor different to value
CRSM_SFT_PD_RDY (0x02) read from System Status Register (CRSM_STAT) for
confirmation powerdown has been reached.

The condition could have only worked when disabling powerdown
(both 0x00), but never when enabling it (0x01 != 0x02).

Result is a timeout, like so:

    $ ifdown eth0
    macb f802c000.ethernet eth0: Link is Down
    ADIN1100 f802c000.ethernet-ffffffff:01: adin_set_powerdown_mode failed: -110
    ADIN1100 f802c000.ethernet-ffffffff:01: adin_set_powerdown_mode failed: -110

Fixes: 7eaf913299 ("net: phy: adin1100: Add initial support for ADIN1100 industrial PHY")
Signed-off-by: Alexander Dahl <ada@thorsis.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20251119124737.280939-2-ada@thorsis.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-12-18 13:55:03 +01:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.