drm/r300: fix bug in r300 userspace hardware wait emission

This interface was originally designed wrong, confusing bit-fields and
integers, major brown paper bag going back many years...

But userspace only ever used 4 values so fix the interface for new
users and fix the implementation to deal with the 4 values userspace
has ever emitted (0x1, 0x2, 0x3, 0x6).

Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 54 insertions, 12 deletions

diff --git a/drivers/char/drm/r300_cmdbuf.c b/drivers/char/drm/r300_cmdbuf.c
index 0f4afc44245c..f535812e4057 100644
--- a/drivers/char/drm/r300_cmdbuf.c
+++ b/drivers/char/drm/r300_cmdbuf.c
@@ -729,6 +729,47 @@ static void r300_discard_buffer(struct drm_device * dev, struct drm_buf * buf)
         buf->used = 0;
 }
 
+static void r300_cmd_wait(drm_radeon_private_t * dev_priv,
+                          drm_r300_cmd_header_t header)
+{
+        u32 wait_until;
+        RING_LOCALS;
+
+        if (!header.wait.flags)
+                return;
+
+        wait_until = 0;
+
+        switch(header.wait.flags) {
+        case R300_WAIT_2D:
+                wait_until = RADEON_WAIT_2D_IDLE;
+                break;
+        case R300_WAIT_3D:
+                wait_until = RADEON_WAIT_3D_IDLE;
+                break;
+        case R300_NEW_WAIT_2D_3D:
+                wait_until = RADEON_WAIT_2D_IDLE|RADEON_WAIT_3D_IDLE;
+                break;
+        case R300_NEW_WAIT_2D_2D_CLEAN:
+                wait_until = RADEON_WAIT_2D_IDLE|RADEON_WAIT_2D_IDLECLEAN;
+                break;
+        case R300_NEW_WAIT_3D_3D_CLEAN:
+                wait_until = RADEON_WAIT_3D_IDLE|RADEON_WAIT_3D_IDLECLEAN;
+                break;
+        case R300_NEW_WAIT_2D_2D_CLEAN_3D_3D_CLEAN:
+                wait_until = RADEON_WAIT_2D_IDLE|RADEON_WAIT_2D_IDLECLEAN;
+                wait_until |= RADEON_WAIT_3D_IDLE|RADEON_WAIT_3D_IDLECLEAN;
+                break;
+        default:
+                return;
+        }
+
+        BEGIN_RING(2);
+        OUT_RING(CP_PACKET0(RADEON_WAIT_UNTIL, 0));
+        OUT_RING(wait_until);
+        ADVANCE_RING();
+}
+
 static int r300_scratch(drm_radeon_private_t *dev_priv,
                         drm_radeon_kcmd_buffer_t *cmdbuf,
                         drm_r300_cmd_header_t header)
@@ -909,19 +950,8 @@ int r300_do_cp_cmdbuf(struct drm_device *dev,
                         break;
 
                 case R300_CMD_WAIT:
-                        /* simple enough, we can do it here */
                         DRM_DEBUG("R300_CMD_WAIT\n");
-                        if (header.wait.flags == 0)
-                                break;  /* nothing to do */
-
-                        {
-                                RING_LOCALS;
-
-                                BEGIN_RING(2);
-                                OUT_RING(CP_PACKET0(RADEON_WAIT_UNTIL, 0));
-                                OUT_RING((header.wait.flags & 0xf) << 14);
-                                ADVANCE_RING();
-                        }
+                        r300_cmd_wait(dev_priv, header);
                         break;
 
                 case R300_CMD_SCRATCH:
diff --git a/drivers/char/drm/radeon_drm.h b/drivers/char/drm/radeon_drm.h
index 71e5b21fad2c..aab82e121e07 100644
--- a/drivers/char/drm/radeon_drm.h
+++ b/drivers/char/drm/radeon_drm.h
@@ -225,8 +225,20 @@ typedef union {
 #define R300_CMD_WAIT                   7
 #       define R300_WAIT_2D             0x1
 #       define R300_WAIT_3D             0x2
+/* these two defines are DOING IT WRONG - however
+ * we have userspace which relies on using these.
+ * The wait interface is backwards compat new 
+ * code should use the NEW_WAIT defines below
+ * THESE ARE NOT BIT FIELDS
+ */
 #       define R300_WAIT_2D_CLEAN       0x3
 #       define R300_WAIT_3D_CLEAN       0x4
+
+#       define R300_NEW_WAIT_2D_3D      0x3
+#       define R300_NEW_WAIT_2D_2D_CLEAN        0x4
+#       define R300_NEW_WAIT_3D_3D_CLEAN        0x6
+#       define R300_NEW_WAIT_2D_2D_CLEAN_3D_3D_CLEAN    0x8
+
 #define R300_CMD_SCRATCH                8
 
 typedef union {