From f5b15ebcd3edfa52a4c8eaa1ef2dd88a60196285 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@localhost>
Date: Wed, 18 May 2011 20:02:17 +0000
Subject: dma: comment

---
 sys/src/9/pc/dma.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sys/src/9/pc/dma.c b/sys/src/9/pc/dma.c
index 4a81f516a..2370442e1 100644
--- a/sys/src/9/pc/dma.c
+++ b/sys/src/9/pc/dma.c
@@ -212,12 +212,15 @@ dmasetup(int chan, void *va, long len, int flags)
 	else
 		xp->len = 0;
 
+	mode =	((flags & DMAREAD) ? 0x44 : 0x48) |	/* read or write */
+		((flags & DMALOOP) ? 0x10 : 0) |	/* auto init mode */
+		chan;
+
 	/*
 	 * this setup must be atomic
 	 */
 	ilock(dp);
-	mode = ((flags & DMAREAD) ? 0x44 : 0x48) | ((flags & DMALOOP) ? 0x10 : 0) | chan;
-	outb(dp->mode, mode);	/* single mode dma (give CPU a chance at mem) */
+	outb(dp->mode, mode);
 	outb(dp->page[chan], pa>>16);
 	outb(dp->cbp, 0);		/* set count & address to their first byte */
 	outb(dp->addr[chan], pa>>dp->shift);		/* set address */
-- 
cgit v1.2.3