Try this...

diff --git a/linux/mga_state.c b/linux/mga_state.c
index 1e1c282..4c9c9c0 100644 (file)
--- a/linux/mga_state.c
+++ b/linux/mga_state.c
@@ -514,6 +514,9 @@ static void mga_dma_dispatch_clear( drm_device_t *dev,
                drm_clip_rect_t *box = &pbox[i];
                u32 height = box->y2 - box->y1;
 
+               DRM_DEBUG( "   from=%d,%d to=%d,%d\n",
+                          box->x1, box->y1, box->x2, box->y2 );
+
                if ( clear->flags & MGA_FRONT ) {
                        BEGIN_DMA( 2 );
 
@@ -591,9 +594,16 @@ static void mga_dma_dispatch_swap( drm_device_t *dev )
        int i;
        DMA_LOCALS;
        DRM_DEBUG( __FUNCTION__ ":\n" );
-       DRM_DEBUG( "   head = 0x%06x\n", MGA_READ( MGA_PRIMADDRESS ) );
 
-       BEGIN_DMA( 3 + nbox );
+       sarea_priv->last_frame.head = dev_priv->prim.tail;
+       sarea_priv->last_frame.wrap = dev_priv->prim.last_wrap;
+
+       BEGIN_DMA( 4 + nbox );
+
+       DMA_BLOCK( MGA_DMAPAD,  0x00000000,
+                  MGA_DMAPAD,  0x00000000,
+                  MGA_DWGSYNC, 0x00007100,
+                  MGA_DWGSYNC, 0x00007000 );
 
        DMA_BLOCK( MGA_DSTORG,  dev_priv->front_offset,
                   MGA_MACCESS, dev_priv->maccess,
@@ -610,6 +620,9 @@ static void mga_dma_dispatch_swap( drm_device_t *dev )
                u32 height = box->y2 - box->y1;
                u32 start = box->y1 * dev_priv->front_pitch;
 
+               DRM_DEBUG( "   from=%d,%d to=%d,%d\n",
+                          box->x1, box->y1, box->x2, box->y2 );
+
                DMA_BLOCK( MGA_AR0,     start + box->x2 - 1,
                           MGA_AR3,     start + box->x1,
                           MGA_FXBNDRY, ((box->x2 - 1) << 16) | box->x1,
@@ -624,12 +637,6 @@ static void mga_dma_dispatch_swap( drm_device_t *dev )
 
        ADVANCE_DMA();
 
-       DRM_DEBUG( "   tail = 0x%06x\n", dev_priv->prim.tail );
-       DRM_DEBUG( "   wrap = 0x%06x\n", dev_priv->prim.last_wrap );
-
-       sarea_priv->last_frame.head = dev_priv->prim.tail;
-       sarea_priv->last_frame.wrap = dev_priv->prim.last_wrap;
-
        FLUSH_DMA();
 
        DRM_DEBUG( "%s... done.\n", __FUNCTION__ );