net: phy: motorcomm: Enable analog frontend on YT8531S

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The YT6801 PCIe NIC includes the dwmac-motorcomm IP for the MAC part, as
well as a YT8531S PHY, configured in GMII mode.

It seems this PHY requires the Analog Front-end (AFE) DAC clock to be
enabled for link to reliably establish, otherwise the link just doesn't
come up.

Let's enable it at config_init() whenever the PHY is in GMII mode.

This logic has been extracted from the vendor driver provided by
Motorcomm.

It's really unclear if this is specific to the integrated version of
that PHY, and how this potentially interacts with the fiber mode this
PHY supports, so this configuration is only enabled when the interface
is GMII, i.e. the PHY is integrated.

With this, the PHY reliably establishes link and the YT6801 PCIe card
becomes fully functional. Supend/Resume was also tested, the link
stays operational after resume.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260905072830.28986-4-maxime.chevallier@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Maxime Chevallier 2026-09-05 09:28:28 +02:00 • committed by Jakub Kicinski

parent 58e1bbfe47

commit 031c64bd1b

1 changed files with 13 additions and 1 deletions

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drivers/net/phy/motorcomm.c

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