drm/i915: Remove useless checks from primary enable/disable

We won't be calling intel_enable_primary_plane() or
intel_disable_primary_plane() with the primary plane in the
wrong state. So remove the useless DISPLAY_PLANE_ENABLE checks.

v2: Convert the checks to WARNs instead (Daniel,Paulo)

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 53746fb3c54a..72b5c34d8ce7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1887,8 +1887,7 @@ static void intel_enable_primary_hw_plane(struct drm_i915_private *dev_priv,
 
         reg = DSPCNTR(plane);
         val = I915_READ(reg);
-        if (val & DISPLAY_PLANE_ENABLE)
-                return;
+        WARN_ON(val & DISPLAY_PLANE_ENABLE);
 
         I915_WRITE(reg, val | DISPLAY_PLANE_ENABLE);
         intel_flush_primary_plane(dev_priv, plane);
@@ -1918,8 +1917,7 @@ static void intel_disable_primary_hw_plane(struct drm_i915_private *dev_priv,
 
         reg = DSPCNTR(plane);
         val = I915_READ(reg);
-        if ((val & DISPLAY_PLANE_ENABLE) == 0)
-                return;
+        WARN_ON((val & DISPLAY_PLANE_ENABLE) == 0);
 
         I915_WRITE(reg, val & ~DISPLAY_PLANE_ENABLE);
         intel_flush_primary_plane(dev_priv, plane);