Module Name: src
Committed By: msaitoh
Date: Fri Oct 20 09:26:13 UTC 2017
Modified Files:
src/sys/dev/pci: if_wm.c
Log Message:
On I219, drop TARC0 bit 28 for DMA hang workaround (from Linux).
To generate a diff of this commit:
cvs rdiff -u -r1.539 -r1.540 src/sys/dev/pci/if_wm.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/pci/if_wm.c
diff -u src/sys/dev/pci/if_wm.c:1.539 src/sys/dev/pci/if_wm.c:1.540
--- src/sys/dev/pci/if_wm.c:1.539 Tue Sep 26 08:25:56 2017
+++ src/sys/dev/pci/if_wm.c Fri Oct 20 09:26:13 2017
@@ -1,4 +1,4 @@
-/* $NetBSD: if_wm.c,v 1.539 2017/09/26 08:25:56 msaitoh Exp $ */
+/* $NetBSD: if_wm.c,v 1.540 2017/10/20 09:26:13 msaitoh Exp $ */
/*
* Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -83,7 +83,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.539 2017/09/26 08:25:56 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.540 2017/10/20 09:26:13 msaitoh Exp $");
#ifdef _KERNEL_OPT
#include "opt_net_mpsafe.h"
@@ -4022,10 +4022,18 @@ wm_initialize_hardware_bits(struct wm_so
case WM_T_PCH_LPT:
case WM_T_PCH_SPT:
/* TARC0 */
- if ((sc->sc_type == WM_T_ICH8)
- || (sc->sc_type == WM_T_PCH_SPT)) {
+ if (sc->sc_type == WM_T_ICH8) {
/* Set TARC0 bits 29 and 28 */
tarc0 |= __BITS(29, 28);
+ } else if (sc->sc_type == WM_T_PCH_SPT) {
+ tarc0 |= __BIT(29);
+ /*
+ * Drop bit 28. From Linux.
+ * See I218/I219 spec update
+ * "5. Buffer Overrun While the I219 is
+ * Processing DMA Transactions"
+ */
+ tarc0 &= ~__BIT(28);
}
/* Set TARC0 bits 23,24,26,27 */
tarc0 |= __BITS(27, 26) | __BITS(24, 23);
