lkml.org 
[lkml]   [2019]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH net 4/4] net: bcmgenet: reset 40nm EPHY on energy detect
Date
The EPHY integrated into the 40nm Set-Top Box devices can falsely
detect energy when connected to a disabled peer interface. When the
peer interface is enabled the EPHY will detect and report the link
as active, but on occasion may get into a state where it is not
able to exchange data with the connected GENET MAC. This issue has
not been observed when the link parameters are auto-negotiated;
however, it has been observed with a manually configured link.

It has been empirically determined that issuing a soft reset to the
EPHY when energy is detected prevents it from getting into this bad
state.

Fixes: 1c1008c793fa ("net: bcmgenet: add main driver file")
Signed-off-by: Doug Berger <opendmb@gmail.com>
---
drivers/net/ethernet/broadcom/genet/bcmgenet.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index f0937c650e3c..0f138280315a 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2018,6 +2018,8 @@ static void bcmgenet_link_intr_enable(struct bcmgenet_priv *priv)
*/
if (priv->internal_phy) {
int0_enable |= UMAC_IRQ_LINK_EVENT;
+ if (GENET_IS_V1(priv) || GENET_IS_V2(priv) || GENET_IS_V3(priv))
+ int0_enable |= UMAC_IRQ_PHY_DET_R;
} else if (priv->ext_phy) {
int0_enable |= UMAC_IRQ_LINK_EVENT;
} else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
@@ -2611,9 +2613,14 @@ static void bcmgenet_irq_task(struct work_struct *work)
priv->irq0_stat = 0;
spin_unlock_irq(&priv->lock);

+ if (status & UMAC_IRQ_PHY_DET_R &&
+ priv->dev->phydev->autoneg != AUTONEG_ENABLE)
+ phy_init_hw(priv->dev->phydev);
+
/* Link UP/DOWN event */
if (status & UMAC_IRQ_LINK_EVENT)
phy_mac_interrupt(priv->dev->phydev);
+
}

/* bcmgenet_isr1: handle Rx and Tx priority queues */
@@ -2708,7 +2715,7 @@ static irqreturn_t bcmgenet_isr0(int irq, void *dev_id)
}

/* all other interested interrupts handled in bottom half */
- status &= UMAC_IRQ_LINK_EVENT;
+ status &= (UMAC_IRQ_LINK_EVENT | UMAC_IRQ_PHY_DET_R);
if (status) {
/* Save irq status for bottom-half processing. */
spin_lock_irqsave(&priv->lock, flags);
--
2.7.4
\
 
 \ /
  Last update: 2019-10-17 01:08    [W:0.112 / U:0.836 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site