drm/i915: add sprite assertion function for VLV

Need to make sure sprites are disabled before shutting off a pipe.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2ee38660a5a5..59d52b729a68 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1288,6 +1288,25 @@ static void assert_planes_disabled(struct drm_i915_private *dev_priv,
         }
 }
 
+static void assert_sprites_disabled(struct drm_i915_private *dev_priv,
+                                    enum pipe pipe)
+{
+        int reg, i;
+        u32 val;
+
+        if (!IS_VALLEYVIEW(dev_priv->dev))
+                return;
+
+        /* Need to check both planes against the pipe */
+        for (i = 0; i < dev_priv->num_plane; i++) {
+                reg = SPCNTR(pipe, i);
+                val = I915_READ(reg);
+                WARN((val & SP_ENABLE),
+                     "sprite %d assertion failure, should be off on pipe %c but is still active\n",
+                     pipe * 2 + i, pipe_name(pipe));
+        }
+}
+
 static void assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)
 {
         u32 val;
@@ -1872,6 +1891,7 @@ static void intel_disable_pipe(struct drm_i915_private *dev_priv,
          * or we might hang the display.
          */
         assert_planes_disabled(dev_priv, pipe);
+        assert_sprites_disabled(dev_priv, pipe);
 
         /* Don't disable pipe A or pipe A PLLs if needed */
         if (pipe == PIPE_A && (dev_priv->quirks & QUIRK_PIPEA_FORCE))