target/linux/mvebu/patches-4.9/420-net-mvneta-disable-MVNETA_CAUSE_PSC_SYNC_CHANGE-inte.patch

   1 From: Russell King <rmk+kernel@armlinux.org.uk>
   2 Date: Sat, 24 Dec 2016 10:27:08 +0000
   3 Subject: [PATCH] net: mvneta: disable MVNETA_CAUSE_PSC_SYNC_CHANGE
   4  interrupt
   5
   6 The PSC sync change interrupt can fire multiple times while the link is
   7 down.  As this isn't information we make use of, it's pointless having
   8 the interrupt enabled, so let's disable this interrupt.
   9
  10 Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
  11 ---
  12
  13 --- a/drivers/net/ethernet/marvell/mvneta.c
  14 +++ b/drivers/net/ethernet/marvell/mvneta.c
  15 @@ -2630,9 +2630,11 @@ static int mvneta_poll(struct napi_struc
  16                 mvreg_write(pp, MVNETA_INTR_MISC_CAUSE, 0);
  17
  18                 if (cause_misc & (MVNETA_CAUSE_PHY_STATUS_CHANGE |
  19 -                                 MVNETA_CAUSE_LINK_CHANGE |
  20 -                                 MVNETA_CAUSE_PSC_SYNC_CHANGE))
  21 +                                 MVNETA_CAUSE_LINK_CHANGE)) {
  22 +                       printk(KERN_DEBUG "%s: cause 0x%08x:0x%08x\n",
  23 +                               __func__, cause_rx_tx, cause_misc);
  24                         mvneta_link_change(pp);
  25 +               }
  26         }
  27
  28         /* Release Tx descriptors */
  29 @@ -2947,8 +2949,7 @@ static void mvneta_start_dev(struct mvne
  30
  31         mvreg_write(pp, MVNETA_INTR_MISC_MASK,
  32                     MVNETA_CAUSE_PHY_STATUS_CHANGE |
  33 -                   MVNETA_CAUSE_LINK_CHANGE |
  34 -                   MVNETA_CAUSE_PSC_SYNC_CHANGE);
  35 +                   MVNETA_CAUSE_LINK_CHANGE);
  36
  37         phylink_start(pp->phylink);
  38         netif_tx_start_all_queues(pp->dev);
  39 @@ -3439,8 +3440,7 @@ static int mvneta_cpu_online(unsigned in
  40         on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true);
  41         mvreg_write(pp, MVNETA_INTR_MISC_MASK,
  42                     MVNETA_CAUSE_PHY_STATUS_CHANGE |
  43 -                   MVNETA_CAUSE_LINK_CHANGE |
  44 -                   MVNETA_CAUSE_PSC_SYNC_CHANGE);
  45 +                   MVNETA_CAUSE_LINK_CHANGE);
  46         netif_tx_start_all_queues(pp->dev);
  47         spin_unlock(&pp->lock);
  48         return 0;
  49 @@ -3481,8 +3481,7 @@ static int mvneta_cpu_dead(unsigned int
  50         on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true);
  51         mvreg_write(pp, MVNETA_INTR_MISC_MASK,
  52                     MVNETA_CAUSE_PHY_STATUS_CHANGE |
  53 -                   MVNETA_CAUSE_LINK_CHANGE |
  54 -                   MVNETA_CAUSE_PSC_SYNC_CHANGE);
  55 +                   MVNETA_CAUSE_LINK_CHANGE);
  56         netif_tx_start_all_queues(pp->dev);
  57         return 0;
  58  }