From 7b5e87d91d062cceb1e4e54b2e144c3c87375234 Mon Sep 17 00:00:00 2001
From: Gareth Hughes <gareth@users.sourceforge.net>
Date: Wed, 28 Feb 2001 11:22:52 +0000
Subject: Please try this if you experience lockups...

---
 linux/r128_drv.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'linux')

diff --git a/linux/r128_drv.h b/linux/r128_drv.h
index ba11f5b4..dfefb4e0 100644
--- a/linux/r128_drv.h
+++ b/linux/r128_drv.h
@@ -454,7 +454,8 @@ do {									\
 
 #define R128_VERBOSE	0
 
-#define RING_LOCALS	int write; unsigned int tail_mask; volatile u32 *ring;
+#define RING_LOCALS							\
+	int write; unsigned int tail_mask; volatile u32 *ring;
 
 #define BEGIN_RING( n ) do {						\
 	if ( R128_VERBOSE ) {						\
@@ -475,6 +476,11 @@ do {									\
 		DRM_INFO( "ADVANCE_RING() tail=0x%06x wr=0x%06x\n",	\
 			  write, dev_priv->ring.tail );			\
 	}								\
+	if ( write < 32 ) {						\
+		memcpy( dev_priv->ring.end,				\
+			dev_priv->ring.start,				\
+			write * sizeof(u32) );				\
+	}								\
 	r128_flush_write_combine();					\
 	dev_priv->ring.tail = write;					\
 	R128_WRITE( R128_PM4_BUFFER_DL_WPTR, write );			\
-- 
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