From: Madalin Bucur <madalin.bucur@xxxxxxxxxxx> Date: Wed, 22 Jan 2020 15:20:26 +0200 > This addresses a HW erratum on some QorIQ DPAA devices. > > MDIO reads to internal PCS registers may result in having > the MDIO_CFG[MDIO_RD_ER] bit set, even when there is no > error and read data (MDIO_DATA[MDIO_DATA]) is correct. > Software may get false read error when reading internal > PCS registers through MDIO. As a workaround, all internal > MDIO accesses should ignore the MDIO_CFG[MDIO_RD_ER] bit. > When the issue was present, one could see such errors > during boot: > > mdio_bus ffe4e5000: Error while reading PHY0 reg at 3.3 Series applied.
