From: Aminuddin Jamaluddin aminuddin.jamaluddin@intel.com
commit 18c532e44939caa17f1fa380f7ac50dbc0718dbb upstream.
Sleep time is added to ensure the phy to be ready after loopback bit was set. This to prevent the phy loopback test from failing.
Fixes: 020a45aff119 ("net: phy: marvell: add Marvell specific PHY loopback") Cc: stable@vger.kernel.org # 5.15.x Signed-off-by: Muhammad Husaini Zulkifli muhammad.husaini.zulkifli@intel.com Signed-off-by: Aminuddin Jamaluddin aminuddin.jamaluddin@intel.com Link: https://lore.kernel.org/r/20221114065302.10625-1-aminuddin.jamaluddin@intel.... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/marvell.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
--- a/drivers/net/phy/marvell.c +++ b/drivers/net/phy/marvell.c @@ -1976,14 +1976,16 @@ static int m88e1510_loopback(struct phy_ if (err < 0) return err;
- /* FIXME: Based on trial and error test, it seem 1G need to have - * delay between soft reset and loopback enablement. - */ - if (phydev->speed == SPEED_1000) - msleep(1000); + err = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, + BMCR_LOOPBACK);
- return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, - BMCR_LOOPBACK); + if (!err) { + /* It takes some time for PHY device to switch + * into/out-of loopback mode. + */ + msleep(1000); + } + return err; } else { err = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 0); if (err < 0)