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On I219, drop TARC0 bit 28 for DMA hang workaround (from Linux).

This commit is contained in:
msaitoh 2017-10-20 09:26:13 +00:00
parent 428e217142
commit c1f515b7e7
1 changed files with 12 additions and 4 deletions
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16
sys/dev/pci/if_wm.c
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@ -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_softc *sc)
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);