net: stmmac: sun8i: reset the MAC after PHY initialization

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The MAC software reset needs a running receive clock from the PHY.
Resetting the MAC at the end of probe therefore fails when the PHY driver
has not been loaded or its probe has deferred on a missing supplier. The
failure removes the MAC and its MDIO bus, so loading the missing driver
later cannot recover the interface without reprobing the MAC.

Perform the software reset in the DMA reset callback instead. The stmmac
core calls it during hardware setup after attaching and initializing the
PHY, and resumes a suspended PHY before reopening or resuming the MAC.
Mask interrupts before requesting the reset and retain the existing
DMA and interrupt-register clearing even if the reset times out. Return
reset errors through the normal hardware-setup error path.

Remove the unconditional reset from probe. Keep the separate H3 MDIO-mux
reset after switching the mux and powering the selected PHY, since it is
needed to latch the selected interface before MDIO accesses.

Tested-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Link: https://patch.msgid.link/20260927-submit-h616-emac1-v1-v6-1-e64971f4e414@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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James Hilliard 2026-09-27 12:52:19 -06:00 • committed by Jakub Kicinski

parent 549f5f48f1

commit fee9c17671

1 changed files with 26 additions and 27 deletions

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53

drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c

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