[src/trunk]: src/sys/dev/pci Wait for the RIRB DMA engine to come ready. Nee...

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

details:   https://anonhg.NetBSD.org/src/rev/afb1171580a4
branches:  trunk
changeset: 333584:afb1171580a4
user:      nonaka <nonaka%NetBSD.org@localhost>
date:      Sun Nov 09 19:57:53 2014 +0000

description:
Wait for the RIRB DMA engine to come ready.  Needed on the audio device
integrated in the Vortex86EX SoC. From OpenBSD.

diffstat:

 sys/dev/pci/azalia.c |  15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)

diffs (36 lines):

diff -r b2235a9390a3 -r afb1171580a4 sys/dev/pci/azalia.c
--- a/sys/dev/pci/azalia.c      Sun Nov 09 19:35:43 2014 +0000
+++ b/sys/dev/pci/azalia.c      Sun Nov 09 19:57:53 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: azalia.c,v 1.82 2014/09/21 14:30:22 christos Exp $     */
+/*     $NetBSD: azalia.c,v 1.83 2014/11/09 19:57:53 nonaka Exp $       */
 
 /*-
  * Copyright (c) 2005, 2008 The NetBSD Foundation, Inc.
@@ -41,7 +41,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: azalia.c,v 1.82 2014/09/21 14:30:22 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: azalia.c,v 1.83 2014/11/09 19:57:53 nonaka Exp $");
 
 #include <sys/param.h>
 #include <sys/device.h>
@@ -816,6 +816,17 @@
        /* Run! */
        rirbctl = AZ_READ_1(az, RIRBCTL);
        AZ_WRITE_1(az, RIRBCTL, rirbctl | HDA_RIRBCTL_RIRBDMAEN | HDA_RIRBCTL_RINTCTL);
+       for (i = 5000; i >= 0; i--) {
+               DELAY(10);
+               rirbctl = AZ_READ_1(az, RIRBCTL);
+               if (rirbctl & HDA_RIRBCTL_RIRBDMAEN)
+                       break;
+       }
+       if (i <= 0) {
+               aprint_error_dev(az->dev, "RIRB is not running\n");
+               return EBUSY;
+       }
+
        return 0;
 }