From 00aa8fc61d8896214d7dfa195f0b832eb648c4e1 Mon Sep 17 00:00:00 2001 From: Doug Berger Date: Wed, 16 Oct 2019 16:06:32 -0700 Subject: [PATCH] net: bcmgenet: reset 40nm EPHY on energy detect 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: 390dff99da87 ("net: bcmgenet: add main driver file") Signed-off-by: Doug Berger Acked-by: Florian Fainelli Signed-off-by: David S. Miller --- 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 f0937c650e3ce..0f138280315a8 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); -- 2.39.5