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>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c529ae6eb2eb6e687bb7128d03ac1112c5f69986..0a2be20cac6919f7519f73070b3011addf89bbff 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1886,8 +1886,7 @@ 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);
@@ -1916,8 +1915,7 @@ 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);