drm/i915: Don't initialize plane_to_crtc_mapping[] on SKL+

We don't use the enum i9xx_plane_id namespace on SKL+ anymore, so
do not initialize the related plane_to_crtc_mapping[] table either.

Actually the only remaining user of that table is the pre-g4x
watermark code, but no harm in initializing the table on all
pre-SKL platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180305174122.17273-1-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a7bfa23..b31b806 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13570,10 +13570,17 @@ static int intel_crtc_init(struct drm_i915_private *dev_priv, enum pipe pipe)
        /* initialize shared scalers */
        intel_crtc_init_scalers(intel_crtc, crtc_state);
 
-       BUG_ON(pipe >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
-              dev_priv->plane_to_crtc_mapping[primary->i9xx_plane] != NULL);
-       dev_priv->plane_to_crtc_mapping[primary->i9xx_plane] = intel_crtc;
-       dev_priv->pipe_to_crtc_mapping[intel_crtc->pipe] = intel_crtc;
+       BUG_ON(pipe >= ARRAY_SIZE(dev_priv->pipe_to_crtc_mapping) ||
+              dev_priv->pipe_to_crtc_mapping[pipe] != NULL);
+       dev_priv->pipe_to_crtc_mapping[pipe] = intel_crtc;
+
+       if (INTEL_GEN(dev_priv) < 9) {
+               enum i9xx_plane_id i9xx_plane = primary->i9xx_plane;
+
+               BUG_ON(i9xx_plane >= ARRAY_SIZE(dev_priv->plane_to_crtc_mapping) ||
+                      dev_priv->plane_to_crtc_mapping[i9xx_plane] != NULL);
+               dev_priv->plane_to_crtc_mapping[i9xx_plane] = intel_crtc;
+       }
 
        drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);