[src/trunk]: src/sys/dev/pci - Add debug printf()s.

[msaitoh <msaitoh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/bc17398108f5
branches:  trunk
changeset: 824834:bc17398108f5
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Tue Jun 20 10:10:36 2017 +0000

description:
- Add debug printf()s.
- If a legacy interrupt is a spurious interrupt, don't print debug message.
- Add comment.

diffstat:

 sys/dev/pci/if_wm.c |  17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

diffs (63 lines):

diff -r 116fcb34c2d9 -r bc17398108f5 sys/dev/pci/if_wm.c
--- a/sys/dev/pci/if_wm.c       Tue Jun 20 08:33:11 2017 +0000
+++ b/sys/dev/pci/if_wm.c       Tue Jun 20 10:10:36 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_wm.c,v 1.510 2017/06/19 10:59:01 msaitoh Exp $      */
+/*     $NetBSD: if_wm.c,v 1.511 2017/06/20 10:10:36 msaitoh Exp $      */
 
 /*
  * Copyright (c) 2001, 2002, 2003, 2004 Wasabi Systems, Inc.
@@ -84,7 +84,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.510 2017/06/19 10:59:01 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wm.c,v 1.511 2017/06/20 10:10:36 msaitoh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_net_mpsafe.h"
@@ -2990,6 +2990,9 @@
        struct wm_softc *sc = ifp->if_softc;
        int rc = 0;
 
+       DPRINTF(WM_DEBUG_INIT, ("%s: %s called\n",
+               device_xname(sc->sc_dev), __func__));
+
        WM_CORE_LOCK(sc);
 
        int change = ifp->if_flags ^ sc->sc_if_flags;
@@ -4069,6 +4072,9 @@
                                break;
                        delay(100);
                }
+               if (timeout == 0)
+                       device_printf(sc->sc_dev,
+                           "failed to disable busmastering\n");
        }
 
        /* Set the completion timeout for interface */
@@ -8469,12 +8475,14 @@
        uint32_t icr, rndval = 0;
        int handled = 0;
 
-       DPRINTF(WM_DEBUG_TX,
-           ("%s: INTx: got intr\n", device_xname(sc->sc_dev)));
        while (1 /* CONSTCOND */) {
                icr = CSR_READ(sc, WMREG_ICR);
                if ((icr & sc->sc_icr) == 0)
                        break;
+               if (handled == 0) {
+                       DPRINTF(WM_DEBUG_TX,
+                           ("%s: INTx: got intr\n", device_xname(sc->sc_dev)));
+               }
                if (rndval == 0)
                        rndval = icr;
 
@@ -13774,6 +13782,7 @@
                }
                lat_enc = (uint16_t)(__SHIFTIN(scale, LTRV_SCALE) | value);
 
+               /* Determine the maximum latency tolerated by the platform */
                preg = pci_conf_read(sc->sc_pc, sc->sc_pcitag,
                    WM_PCI_LTR_CAP_LPT);
                max_snoop = preg & 0xffff;