net: phy: marvell: keep WOL_EIE across interrupt reconfiguration

marvell_config_intr() rewrites the whole interrupt enable register, so
the config_intr call from phy_init_hw() on resume silently cleared
WOL_EIE on the 88E1318S and 88E1510: m88e1318_get_wol() still reported
WAKE_MAGIC, but a matched magic packet was no longer routed to INTn and
the board did not wake.

Bit 7 of that register is WOL_EIE only on these two PHYs; on others,
such as the 88E1111, it enables a FIFO error interrupt. So give the
88E1318S and 88E1510 their own config_intr and handle_interrupt, and
leave the shared callbacks unchanged.

m88e1318_set_wol() now records whether WoL is enabled, and both it and
the new config_intr derive WOL_EIE from that state under the MDIO bus
lock. WOL_EIE stays set across config_intr while WoL is enabled, except
when the PHY has an interrupt line and interrupts are being disabled,
as in phy_free_interrupt(): INTn is then the PHY IRQ, and nothing would
read IEVENT after free_irq() to release it. The bit is set again once
interrupts are re-enabled. phy_probe() still clears a WOL_EIE left by a
previous boot, since WoL starts out disabled. The new handler also
claims WoL events, so they do not go unacknowledged when the PHY IRQ is
in use.

Helios4 (Armada 388, 88E1512), 7.2.9. With this patch WOL_EIE stays set
over 3 link down/up cycles, "wol d" clears it, and a magic packet on a
running board is a handled interrupt. Without it, WOL_EIE is lost on the
first down/up, survives "wol d", and the magic packet is an unhandled
interrupt.

Fixes: 3871c3876f80 ("mv643xx_eth with 88E1318S: support Wake on LAN")
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Tested-by: Igor Velkov <iav@iav.lv>
Link: https://patch.msgid.link/20261014194818.11640-2-rosenp@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions