drm/i915: Utilize edp_disable_dsc from VBT

Disable eDP DSC usage when instructed to do so by the VBT.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517145356.26103-7-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

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

@@ -1525,6 +1525,10 @@ parse_edp(struct drm_i915_private *i915,
 	if (i915->display.vbt.version >= 244)
 		panel->vbt.edp.max_link_rate =
 			edp->edp_max_port_link_rate[panel_type] * 20;
+
+	if (i915->display.vbt.version >= 251)
+		panel->vbt.edp.dsc_disable =
+			panel_bool(edp->edp_dsc_disable, panel_type);
 }
 
 static void

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

@@ -335,6 +335,7 @@ struct intel_vbt_panel_data {
 		u8 drrs_msa_timing_delay;
 		bool low_vswing;
 		bool hobl;
+		bool dsc_disable;
 	} edp;
 
 	struct {

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

@@ -1181,6 +1181,10 @@ bool intel_dp_has_dsc(const struct intel_connector *connector)
 	if (connector->mst_port && !HAS_DSC_MST(i915))
 		return false;
 
+	if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
+	    connector->panel.vbt.edp.dsc_disable)
+		return false;
+
 	if (!drm_dp_sink_supports_dsc(connector->dp.dsc_dpcd))
 		return false;