drm: Use register writes instead of BITBLT_MULTI packets for buffer swap blits

This takes up two more ring buffer entries per rectangle blitted but makes sure
the blit is performed top to bottom, reducing the likelyhood of tearing.

Signed-off-by: Dave Airlie <airlied@linux.ie>

2 files changed, 7 insertions, 2 deletions

diff --git a/drivers/char/drm/radeon_drv.h b/drivers/char/drm/radeon_drv.h
index a3190fcc34e3..f45cd7f147a5 100644
--- a/drivers/char/drm/radeon_drv.h
+++ b/drivers/char/drm/radeon_drv.h
@@ -425,6 +425,8 @@ extern int r300_do_cp_cmdbuf(drm_device_t * dev, DRMFILE filp,
 #define RADEON_RB3D_COLOROFFSET         0x1c40
 #define RADEON_RB3D_COLORPITCH          0x1c48
 
+#define RADEON_SRC_X_Y                  0x1590
+
 #define RADEON_DP_GUI_MASTER_CNTL       0x146c
 #       define RADEON_GMC_SRC_PITCH_OFFSET_CNTL (1 << 0)
 #       define RADEON_GMC_DST_PITCH_OFFSET_CNTL (1 << 1)
@@ -442,6 +444,7 @@ extern int r300_do_cp_cmdbuf(drm_device_t * dev, DRMFILE filp,
 #       define RADEON_ROP3_S                    0x00cc0000
 #       define RADEON_ROP3_P                    0x00f00000
 #define RADEON_DP_WRITE_MASK            0x16cc
+#define RADEON_SRC_PITCH_OFFSET         0x1428
 #define RADEON_DST_PITCH_OFFSET         0x142c
 #define RADEON_DST_PITCH_OFFSET_C       0x1c80
 #       define RADEON_DST_TILE_LINEAR           (0 << 30)
diff --git a/drivers/char/drm/radeon_state.c b/drivers/char/drm/radeon_state.c
index bb4b2e1a78c1..feac5f005d47 100644
--- a/drivers/char/drm/radeon_state.c
+++ b/drivers/char/drm/radeon_state.c
@@ -1269,9 +1269,9 @@ static void radeon_cp_dispatch_swap(drm_device_t * dev)
 
                 DRM_DEBUG("dispatch swap %d,%d-%d,%d\n", x, y, w, h);
 
-                BEGIN_RING(7);
+                BEGIN_RING(9);
 
-                OUT_RING(CP_PACKET3(RADEON_CNTL_BITBLT_MULTI, 5));
+                OUT_RING(CP_PACKET0(RADEON_DP_GUI_MASTER_CNTL, 0));
                 OUT_RING(RADEON_GMC_SRC_PITCH_OFFSET_CNTL |
                          RADEON_GMC_DST_PITCH_OFFSET_CNTL |
                          RADEON_GMC_BRUSH_NONE |
@@ -1283,6 +1283,7 @@ static void radeon_cp_dispatch_swap(drm_device_t * dev)
 
                 /* Make this work even if front & back are flipped:
                  */
+                OUT_RING(CP_PACKET0(RADEON_SRC_PITCH_OFFSET, 1));
                 if (dev_priv->current_page == 0) {
                         OUT_RING(dev_priv->back_pitch_offset);
                         OUT_RING(dev_priv->front_pitch_offset);
@@ -1291,6 +1292,7 @@ static void radeon_cp_dispatch_swap(drm_device_t * dev)
                         OUT_RING(dev_priv->back_pitch_offset);
                 }
 
+                OUT_RING(CP_PACKET0(RADEON_SRC_X_Y, 2));
                 OUT_RING((x << 16) | y);
                 OUT_RING((x << 16) | y);
                 OUT_RING((w << 16) | h);