Mask LPI interrupts. This fixes an interrupt storm on dwge(4) variants

that support Energy Efficient Ethernet when connected to a switch that
also supports Energy Effient Ethernet.  For example on the odroid-hc4.

ok patrick@

diff --git a/sys/dev/fdt/if_dwge.c b/sys/dev/fdt/if_dwge.c
index 5695d85..70dc8a9 100644 (file)
--- a/sys/dev/fdt/if_dwge.c
+++ b/sys/dev/fdt/if_dwge.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: if_dwge.c,v 1.10 2021/07/28 13:43:11 patrick Exp $    */
+/*     $OpenBSD: if_dwge.c,v 1.11 2021/10/22 14:28:54 kettenis Exp $   */
 /*
  * Copyright (c) 2008, 2019 Mark Kettenis <kettenis@openbsd.org>
  * Copyright (c) 2017 Patrick Wildt <patrick@blueri.se>
@@ -92,6 +92,7 @@
 #define GMAC_VERSION           0x0020
 #define  GMAC_VERSION_SNPS_MASK                0xff
 #define GMAC_INT_MASK          0x003c
+#define  GMAC_INT_MASK_LPIIM           (1 << 10)
 #define  GMAC_INT_MASK_PIM             (1 << 3)
 #define  GMAC_INT_MASK_RIM             (1 << 0)
 #define GMAC_MAC_ADDR0_HI      0x0040
@@ -528,7 +529,8 @@ dwge_attach(struct device *parent, struct device *self, void *aux)
 
        /* Disable interrupts. */
        dwge_write(sc, GMAC_INT_ENA, 0);
-       dwge_write(sc, GMAC_INT_MASK, GMAC_INT_MASK_PIM | GMAC_INT_MASK_RIM);
+       dwge_write(sc, GMAC_INT_MASK,
+           GMAC_INT_MASK_LPIIM | GMAC_INT_MASK_PIM | GMAC_INT_MASK_RIM);
        dwge_write(sc, GMAC_MMC_RX_INT_MSK, 0xffffffff);
        dwge_write(sc, GMAC_MMC_TX_INT_MSK, 0xffffffff);
        dwge_write(sc, GMAC_MMC_IPC_INT_MSK, 0xffffffff);