drm/i915: Reject >9 ddi translation entried if port != A/E on SKL

Only DDI A and E support 10 translation entries in DP mode. For the
other ports the tenth entry is reserved for HDMI.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1449597590-6971-9-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index c47146473471..3edb10a4f0b4 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -435,6 +435,10 @@ static void intel_prepare_ddi_buffers(struct drm_i915_private *dev_priv,
                 if (dev_priv->vbt.ddi_port_info[port].hdmi_boost_level ||
                     dev_priv->vbt.ddi_port_info[port].dp_boost_level)
                         iboost_bit = 1<<31;
+
+                if (WARN_ON(port != PORT_A &&
+                            port != PORT_E && n_edp_entries > 9))
+                        n_edp_entries = 9;
         } else if (IS_BROADWELL(dev_priv)) {
                 ddi_translations_fdi = bdw_ddi_translations_fdi;
                 ddi_translations_dp = bdw_ddi_translations_dp;
@@ -2084,6 +2088,11 @@ static void skl_ddi_set_iboost(struct drm_i915_private *dev_priv,
                         iboost = dp_iboost;
                 } else {
                         ddi_translations = skl_get_buf_trans_edp(dev_priv, &n_entries);
+
+                        if (WARN_ON(port != PORT_A &&
+                                    port != PORT_E && n_entries > 9))
+                                n_entries = 9;
+
                         iboost = ddi_translations[level].i_boost;
                 }
         } else if (type == INTEL_OUTPUT_HDMI) {