drm/i915: add asserts for cursor disabled

The cursor is supposed to be disabled during crtc mode set (disabled by
ctrc disable). Assert this is the case.

v2: move cursor disabled assert next to plane asserts (Ville)

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b8d409f5ead3..2e74ccce447d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1069,6 +1069,26 @@ static void assert_panel_unlocked(struct drm_i915_private *dev_priv,
              pipe_name(pipe));
 }
 
+static void assert_cursor(struct drm_i915_private *dev_priv,
+                          enum pipe pipe, bool state)
+{
+        struct drm_device *dev = dev_priv->dev;
+        bool cur_state;
+
+        if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
+                cur_state = I915_READ(CURCNTR_IVB(pipe)) & CURSOR_MODE;
+        else if (IS_845G(dev) || IS_I865G(dev))
+                cur_state = I915_READ(_CURACNTR) & CURSOR_ENABLE;
+        else
+                cur_state = I915_READ(CURCNTR(pipe)) & CURSOR_MODE;
+
+        WARN(cur_state != state,
+             "cursor on pipe %c assertion failure (expected %s, current %s)\n",
+             pipe_name(pipe), state_string(state), state_string(cur_state));
+}
+#define assert_cursor_enabled(d, p) assert_cursor(d, p, true)
+#define assert_cursor_disabled(d, p) assert_cursor(d, p, false)
+
 void assert_pipe(struct drm_i915_private *dev_priv,
                  enum pipe pipe, bool state)
 {
@@ -1670,6 +1690,7 @@ static void intel_enable_pipe(struct drm_i915_private *dev_priv, enum pipe pipe,
         u32 val;
 
         assert_planes_disabled(dev_priv, pipe);
+        assert_cursor_disabled(dev_priv, pipe);
         assert_sprites_disabled(dev_priv, pipe);
 
         if (HAS_PCH_LPT(dev_priv->dev))
@@ -1731,6 +1752,7 @@ static void intel_disable_pipe(struct drm_i915_private *dev_priv,
          * or we might hang the display.
          */
         assert_planes_disabled(dev_priv, pipe);
+        assert_cursor_disabled(dev_priv, pipe);
         assert_sprites_disabled(dev_priv, pipe);
 
         /* Don't disable pipe A or pipe A PLLs if needed */
@@ -3867,6 +3889,7 @@ static void intel_crtc_disable(struct drm_crtc *crtc)
         dev_priv->display.off(crtc);
 
         assert_plane_disabled(dev->dev_private, to_intel_crtc(crtc)->plane);
+        assert_cursor_disabled(dev_priv, to_intel_crtc(crtc)->pipe);
         assert_pipe_disabled(dev->dev_private, to_intel_crtc(crtc)->pipe);
 
         if (crtc->fb) {