[src/trunk]: src/sys/arch/arm/broadcom cv_wait -> cv_timedwait for dma transf...

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

details:   https://anonhg.NetBSD.org/src/rev/e1abd94d91d1
branches:  trunk
changeset: 802387:e1abd94d91d1
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Fri Sep 12 21:00:11 2014 +0000

description:
cv_wait -> cv_timedwait for dma transfers, just to be safe

diffstat:

 sys/arch/arm/broadcom/bcm2835_emmc.c |  22 +++++++++++++++++-----
 1 files changed, 17 insertions(+), 5 deletions(-)

diffs (68 lines):

diff -r 4aaba84c298d -r e1abd94d91d1 sys/arch/arm/broadcom/bcm2835_emmc.c
--- a/sys/arch/arm/broadcom/bcm2835_emmc.c      Fri Sep 12 20:55:48 2014 +0000
+++ b/sys/arch/arm/broadcom/bcm2835_emmc.c      Fri Sep 12 21:00:11 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bcm2835_emmc.c,v 1.12 2014/09/12 20:55:48 jmcneill Exp $       */
+/*     $NetBSD: bcm2835_emmc.c,v 1.13 2014/09/12 21:00:11 jmcneill Exp $       */
 
 /*-
  * Copyright (c) 2012 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bcm2835_emmc.c,v 1.12 2014/09/12 20:55:48 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bcm2835_emmc.c,v 1.13 2014/09/12 21:00:11 jmcneill Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -38,6 +38,7 @@
 #include <sys/bus.h>
 #include <sys/condvar.h>
 #include <sys/mutex.h>
+#include <sys/kernel.h>
 
 #include <arm/broadcom/bcm2835reg.h>
 #include <arm/broadcom/bcm_amba.h>
@@ -233,6 +234,7 @@
 {
        struct bcmemmc_softc * const sc = *(void **)hp; /* XXX XXX XXX */
        size_t seg;
+       int error;
 
        for (seg = 0; seg < cmd->c_dmamap->dm_nsegs; seg++) {
                sc->sc_cblk[seg].cb_ti =
@@ -275,20 +277,30 @@
        bus_dmamap_sync(sc->sc.sc_dmat, sc->sc_dmamap, 0,
            sc->sc_dmamap->dm_mapsize, BUS_DMASYNC_PREWRITE);
 
+       error = 0;
+
        mutex_enter(&sc->sc_lock);
        KASSERT(sc->sc_state == EMMC_DMA_STATE_IDLE);
        sc->sc_state = EMMC_DMA_STATE_BUSY;
        bcm_dmac_set_conblk_addr(sc->sc_dmac,
            sc->sc_dmamap->dm_segs[0].ds_addr);
        bcm_dmac_transfer(sc->sc_dmac);
-       while (sc->sc_state == EMMC_DMA_STATE_BUSY)
-               cv_wait(&sc->sc_cv, &sc->sc_lock);
+       while (sc->sc_state == EMMC_DMA_STATE_BUSY) {
+               error = cv_timedwait(&sc->sc_cv, &sc->sc_lock, hz * 10);
+               if (error == EWOULDBLOCK) {
+                       device_printf(sc->sc.sc_dev, "transfer timeout!\n");
+                       bcm_dmac_halt(sc->sc_dmac);
+                       sc->sc_state = EMMC_DMA_STATE_IDLE;
+                       error = ETIMEDOUT;
+                       break;
+               }
+       }
        mutex_exit(&sc->sc_lock);
 
        bus_dmamap_sync(sc->sc.sc_dmat, sc->sc_dmamap, 0,
            sc->sc_dmamap->dm_mapsize, BUS_DMASYNC_POSTWRITE);
 
-       return 0;
+       return error;
 }
 
 static void