From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Tue, 2 Jan 2018 17:25:09 +0000
Subject: net: mvneta: disable MVNETA_CAUSE_PSC_SYNC_CHANGE interrupt
Patch-mainline: v4.16-rc1
Git-commit: 856b2cc560345c28733fefaad2d66eddd663848b
References: bsc#1119113 FATE#326472

The PSC sync change interrupt can fire multiple times while the link is
down, which is caused by noise on the serdes lines. As this isn't
information we make use of, it's pointless having the interrupt enabled.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/marvell/mvneta.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -2704,8 +2704,7 @@ static int mvneta_poll(struct napi_struc
 		mvreg_write(pp, MVNETA_INTR_MISC_CAUSE, 0);
 
 		if (cause_misc & (MVNETA_CAUSE_PHY_STATUS_CHANGE |
-				  MVNETA_CAUSE_LINK_CHANGE |
-				  MVNETA_CAUSE_PSC_SYNC_CHANGE))
+				  MVNETA_CAUSE_LINK_CHANGE))
 			mvneta_link_change(pp);
 	}
 
@@ -3044,8 +3043,7 @@ static void mvneta_start_dev(struct mvne
 
 	mvreg_write(pp, MVNETA_INTR_MISC_MASK,
 		    MVNETA_CAUSE_PHY_STATUS_CHANGE |
-		    MVNETA_CAUSE_LINK_CHANGE |
-		    MVNETA_CAUSE_PSC_SYNC_CHANGE);
+		    MVNETA_CAUSE_LINK_CHANGE);
 
 	phylink_start(pp->phylink);
 	netif_tx_start_all_queues(pp->dev);
@@ -3570,8 +3568,7 @@ static int mvneta_cpu_online(unsigned in
 	on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true);
 	mvreg_write(pp, MVNETA_INTR_MISC_MASK,
 		    MVNETA_CAUSE_PHY_STATUS_CHANGE |
-		    MVNETA_CAUSE_LINK_CHANGE |
-		    MVNETA_CAUSE_PSC_SYNC_CHANGE);
+		    MVNETA_CAUSE_LINK_CHANGE);
 	netif_tx_start_all_queues(pp->dev);
 	spin_unlock(&pp->lock);
 	return 0;
@@ -3612,8 +3609,7 @@ static int mvneta_cpu_dead(unsigned int
 	on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true);
 	mvreg_write(pp, MVNETA_INTR_MISC_MASK,
 		    MVNETA_CAUSE_PHY_STATUS_CHANGE |
-		    MVNETA_CAUSE_LINK_CHANGE |
-		    MVNETA_CAUSE_PSC_SYNC_CHANGE);
+		    MVNETA_CAUSE_LINK_CHANGE);
 	netif_tx_start_all_queues(pp->dev);
 	return 0;
 }