On Wed, Aug 17, 2022 at 03:14:06PM +0530, Ravi Gunasekaran wrote: > On the CPSW and ICSS peripherals, there is a possibility that the MDIO > interface returns corrupt data on MDIO reads or writes incorrect data > on MDIO writes. There is also a possibility for the MDIO interface to > become unavailable until the next peripheral reset. > > The workaround is to configure the MDIO in manual mode and disable the > MDIO state machine and emulate the MDIO protocol by reading and writing > appropriate fields in MDIO_MANUAL_IF_REG register of the MDIO controller > to manipulate the MDIO clock and data pins. > > More details about the errata i2329 and the workaround is available in: > https://www.ti.com/lit/er/sprz487a/sprz487a.pdf > > Add implementation to disable MDIO state machine, configure MDIO in manual > mode and achieve MDIO read and writes via MDIO Bitbanging > > Signed-off-by: Ravi Gunasekaran <r-gunasekaran@xxxxxx> > Reported-by: kernel test robot <lkp@xxxxxxxxx> Reviewed-by: Andrew Lunn <andrew@xxxxxxx> Andrew
