drm/i915: Warn if drm_vblank_get() still works after drm_vblank_off()

v2: Drop the drm_vblank_off() (Daniel)
    Use drm_crtc_vblank_{get,put}()

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 99eb7ca..8f6b932 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1341,6 +1341,12 @@ static void assert_sprites_disabled(struct drm_i915_private *dev_priv,
        }
 }
 
+static void assert_vblank_disabled(struct drm_crtc *crtc)
+{
+       if (WARN_ON(drm_crtc_vblank_get(crtc) == 0))
+               drm_crtc_vblank_put(crtc);
+}
+
 static void ibx_assert_pch_refclk_enabled(struct drm_i915_private *dev_priv)
 {
        u32 val;
@@ -3905,6 +3911,8 @@ static void intel_crtc_enable_planes(struct drm_crtc *crtc)
        int pipe = intel_crtc->pipe;
        int plane = intel_crtc->plane;
 
+       assert_vblank_disabled(crtc);
+
        drm_vblank_on(dev, pipe);
 
        intel_enable_primary_hw_plane(dev_priv, plane, pipe);
@@ -3954,6 +3962,8 @@ static void intel_crtc_disable_planes(struct drm_crtc *crtc)
        intel_frontbuffer_flip(dev, INTEL_FRONTBUFFER_ALL_MASK(pipe));
 
        drm_vblank_off(dev, pipe);
+
+       assert_vblank_disabled(crtc);
 }
 
 static void ironlake_crtc_enable(struct drm_crtc *crtc)