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realtek: mdio: prevent WARN_ONCE() during bus scan

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The mdio bus detection will be changed from DTS based detection to
autoscan. To avoid spurious WARN_ONCE() messages return -EIO for
reads to register 2 during C22 scan when phy is on a c45 based bus.
The C45 rescan afterwards will detect the phy normally.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/21968
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Markus Stockhausen 2026-02-10 19:49:44 +01:00 • committed by Robert Marko
parent c092ca445a
commit df939b3316
1 changed files with 4 additions and 0 deletions
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4
target/linux/realtek/files-6.12/drivers/net/mdio/mdio-realtek-otto.c
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@ -504,6 +504,10 @@ static int rtmdio_read(struct mii_bus *bus, int addr, int regnum)
if (addr >= ctrl->cfg->cpu_port)
return -ENODEV;
/* prevent WARN_ONCE() during scan */
if (ctrl->smi_bus[addr] >=0 && ctrl->smi_bus_isc45[ctrl->smi_bus[addr]] && regnum == 2)
return -EIO;
if (regnum == RTMDIO_PAGE_SELECT && ctrl->page[addr] != ctrl->cfg->raw_page)
return ctrl->page[addr];