path: root/drivers
diff options
authorHans Andersson <>2019-09-26 09:54:37 +0200
committerDavid S. Miller <>2019-09-27 20:27:26 +0200
commit407d8098cb1ab338199f4753162799a488d87d23 (patch)
treefdae4189240b8df288ec16d52c21d7dcc36d35c2 /drivers
parentfd4a8093ec0bd37d450587d50f3e10f0af57cc47 (diff)
net: phy: micrel: add Asym Pause workaround for KSZ9021
The Micrel KSZ9031 PHY may fail to establish a link when the Asymmetric Pause capability is set. This issue is described in a Silicon Errata (DS80000691D or DS80000692D), which advises to always disable the capability. Micrel KSZ9021 has no errata, but has the same issue with Asymmetric Pause. This patch apply the same workaround as the one for KSZ9031. Fixes: 3aed3e2a143c ("net: phy: micrel: add Asym Pause workaround") Signed-off-by: Hans Andersson <> Reviewed-by: Andrew Lunn <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'drivers')
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 3c8186f269f9..2fea5541c35a 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -763,6 +763,8 @@ static int ksz9031_get_features(struct phy_device *phydev)
* Whenever the device's Asymmetric Pause capability is set to 1,
* link-up may fail after a link-up to link-down transition.
+ * The Errata Sheet is for ksz9031, but ksz9021 has the same issue
+ *
* Workaround:
* Do not enable the Asymmetric Pause capability bit.
@@ -1076,6 +1078,7 @@ static struct phy_driver ksphy_driver[] = {
.driver_data = &ksz9021_type,
.probe = kszphy_probe,
+ .get_features = ksz9031_get_features,
.config_init = ksz9021_config_init,
.ack_interrupt = kszphy_ack_interrupt,
.config_intr = kszphy_config_intr,