drm/i915/bxt: Fix eDP panel fitting (v2)

BXT CRTC scaling uses the same gen9 codepaths as SKL; these codepaths
store panel fitter information in pipe_config->pch_pfit.  However since
HAS_PCH_SPLIT() is false for BXT we never actually wind up filling in
this structure (we wind up filling in pipe_config->gmch_pfit instead,
which is ignored when we go to program the hardware).  Make sure we
always take the PCH code path on gen9+ platforms.

v2: Use HAS_GMCH_DISPLAY() to more cleanly describe the platforms that
    actually want to use GMCH-style panel fitting.  (Ville)

Cc: Imre Deak <imre.deak@intel.com>
Cc: Chandra Konduru <chandra.konduru@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1446656727-3516-1-git-send-email-matthew.d.roper@intel.com

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 1cb1f3f9f4d1dc41dc97a4c345d01289f25544af..4655af0c4649a625dee7d9728060aa0af4daa9c0 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1426,7 +1426,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
                                return ret;
                }
 
-               if (!HAS_PCH_SPLIT(dev))
+               if (HAS_GMCH_DISPLAY(dev))
                        intel_gmch_panel_fitting(intel_crtc, pipe_config,
                                                 intel_connector->panel.fitting_mode);
                else