drm/i915/bigjoiner: Mode validation with uncompressed pipe joiner

No need for checking dsc flag for uncompressed pipe joiner mode
validation.

Cc: Manasi Navare <manasi.d.navare@intel.com>
Signed-off-by: NAnimesh Manna <animesh.manna@intel.com>
Signed-off-by: NClinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: NMatt Roper <matthew.d.roper@intel.com>
Reviewed-by: NAnusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: NManasi Navare <manasi.d.navare@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210514153711.2359617-14-matthew.d.roper@intel.com

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

@@ -818,8 +818,11 @@ intel_dp_mode_valid(struct drm_connector *connector,
 		dsc = dsc_max_output_bpp && dsc_slice_count;
 	}
 
-	/* big joiner configuration needs DSC */
-	if (bigjoiner && !dsc)
+	/*
+	 * Big joiner configuration needs DSC for TGL which is not true for
+	 * XE_LPD where uncompressed joiner is supported.
+	 */
+	if (DISPLAY_VER(dev_priv) < 13 && bigjoiner && !dsc)
 		return MODE_CLOCK_HIGH;
 
 	if (mode_rate > max_rate && !dsc)