-----Original Message----- From: Ioana Ciornei ioana.ciornei@nxp.com Sent: 09 December 2020 13:32 To: joe.hershberger@ni.com; Tom Rini trini@konsulko.com; u- boot@lists.denx.de Cc: Madalin Bucur madalin.bucur@nxp.com; Florin Laurentiu Chiculita florinlaurentiu.chiculita@nxp.com; Ioana Ciornei ioana.ciornei@nxp.com Subject: [PATCH] net: memac_phy: add a timeout to MDIO operations
We have encountered circumstances when a board design does not include pull-up resistors on the external MDIO buses which are not used. This leads to the MDIO data line not being pulled-up, thus the MDIO controller will always see the line as busy.
Without a timeout in the MDIO bus driver, the execution is stuck in an infinite loop when any access is initiated on that external bus.
Add a timeout in the driver so that we are protected in this circumstance. This is similar to what is being done in the Linux xgmac_mdio driver.
Signed-off-by: Ioana Ciornei ioana.ciornei@nxp.com
drivers/net/fm/memac_phy.c | 76 +++++++++++++++++++++++++++++--------- 1 file changed, 58 insertions(+), 18 deletions(-)
Reviewed-by: Madalin Bucur madalin.bucur@oss.nxp.com