[src/trunk]: src/sys/dev/ic Clear dtr on transition from !0 to 0, and set it ...

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

details:   https://anonhg.NetBSD.org/src/rev/7bf17ba104fe
branches:  trunk
changeset: 795335:7bf17ba104fe
user:      christos <christos%NetBSD.org@localhost>
date:      Tue Apr 08 00:09:15 2014 +0000

description:
Clear dtr on transition from !0 to 0, and set it on the opposite.
This leaves dtr alone in the normal case.

diffstat:

 sys/dev/ic/com.c |  10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diffs (33 lines):

diff -r 1df49b8a9271 -r 7bf17ba104fe sys/dev/ic/com.c
--- a/sys/dev/ic/com.c  Mon Apr 07 21:38:28 2014 +0000
+++ b/sys/dev/ic/com.c  Tue Apr 08 00:09:15 2014 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: com.c,v 1.324 2014/04/06 23:29:58 christos Exp $ */
+/* $NetBSD: com.c,v 1.325 2014/04/08 00:09:15 christos Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999, 2004, 2008 The NetBSD Foundation, Inc.
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.324 2014/04/06 23:29:58 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.325 2014/04/08 00:09:15 christos Exp $");
 
 #include "opt_com.h"
 #include "opt_ddb.h"
@@ -1424,12 +1424,10 @@
        }
        sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd;
 
-       if (ospeed == 0)
+       if (t->c_ospeed == 0 && tp->t_ospeed != 0)
                CLR(sc->sc_mcr, sc->sc_mcr_dtr);
-#if 0
-       else
+       else if (t->c_ospeed != 0 && tp->t_ospeed == 0)
                SET(sc->sc_mcr, sc->sc_mcr_dtr);
-#endif
 
        sc->sc_dlbl = ospeed;
        sc->sc_dlbh = ospeed >> 8;