drm/i915/bios: intel_bios_hdmi_boost_level()

Don't access i915->vbt.ddi_port_info[] directly.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/6d61a5bc60c995d2ee812ef61d3c5c93b61453e7.1579270868.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_bios.c

@@ -2585,3 +2585,10 @@ int intel_bios_dp_boost_level(struct intel_encoder *encoder)
 
 	return i915->vbt.ddi_port_info[encoder->port].dp_boost_level;
 }
+
+int intel_bios_hdmi_boost_level(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+
+	return i915->vbt.ddi_port_info[encoder->port].hdmi_boost_level;
+}

drivers/gpu/drm/i915/display/intel_bios.h

@@ -250,5 +250,6 @@ bool intel_bios_get_dsc_params(struct intel_encoder *encoder,
 int intel_bios_max_tmds_clock(struct intel_encoder *encoder);
 int intel_bios_hdmi_level_shift(struct intel_encoder *encoder);
 int intel_bios_dp_boost_level(struct intel_encoder *encoder);
+int intel_bios_hdmi_boost_level(struct intel_encoder *encoder);
 
 #endif /* _INTEL_BIOS_H_ */

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -1055,8 +1055,7 @@ static void intel_prepare_hdmi_ddi_buffers(struct intel_encoder *encoder,
 		level = n_entries - 1;
 
 	/* If we're boosting the current, set bit 31 of trans1 */
-	if (IS_GEN9_BC(dev_priv) &&
-	    dev_priv->vbt.ddi_port_info[port].hdmi_boost_level)
+	if (IS_GEN9_BC(dev_priv) && intel_bios_hdmi_boost_level(encoder))
 		iboost_bit = DDI_BUF_BALANCE_LEG_ENABLE;
 
 	/* Entry 9 is for HDMI: */
@@ -2341,7 +2340,7 @@ static void skl_ddi_set_iboost(struct intel_encoder *encoder,
 	u8 iboost;
 
 	if (type == INTEL_OUTPUT_HDMI)
-		iboost = dev_priv->vbt.ddi_port_info[port].hdmi_boost_level;
+		iboost = intel_bios_hdmi_boost_level(encoder);
 	else
 		iboost = intel_bios_dp_boost_level(encoder);