From: Andrew Lunn <and...@lunn.ch> Sent: Wednesday, April 29, 2020 2:02 AM > On Tue, Apr 28, 2020 at 07:58:33PM +0200, Andrew Lunn wrote: > > The change to polled IO for MDIO completion assumes that MII events > > are only generated for MDIO transactions. However on some SoCs writing > > to the MII_SPEED register can also trigger an MII event. As a result, > > the next MDIO read has a pending MII event, and immediately reads the > > data registers before it contains useful data. When the read does > > complete, another MII event is posted, which results in the next read > > also going wrong, and the cycle continues. > > > > By writing 0 to the MII_DATA register before writing to the speed > > register, this MII event for the MII_SPEED is suppressed, and polled > > IO works as expected. > > Hi Andy > > Could you get your LAVA instances to test this? Or do we need to wait for it > to > make its way into net-next? > > Thanks > Andrew
Yes, we need to wait for linux next. Andy
