drm/i915/tc: fix the reset of ln0

Setting ln0 similar to ln1

Fixes: 3b51be4 ("drm/i915/tc: Update DP_MODE programming")
Cc: <[email protected]> # v5.5+
Signed-off-by: Khaled Almahallawy <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 4f72a8e)
Signed-off-by: Joonas Lahtinen <[email protected]>

Author: almahallawy

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

@@ -2987,7 +2987,7 @@ icl_program_mg_dp_mode(struct intel_digital_port *intel_dig_port,
 		ln1 = intel_de_read(dev_priv, MG_DP_MODE(1, tc_port));
 	}
 
-	ln0 &= ~(MG_DP_MODE_CFG_DP_X1_MODE | MG_DP_MODE_CFG_DP_X1_MODE);
+	ln0 &= ~(MG_DP_MODE_CFG_DP_X1_MODE | MG_DP_MODE_CFG_DP_X2_MODE);
 	ln1 &= ~(MG_DP_MODE_CFG_DP_X1_MODE | MG_DP_MODE_CFG_DP_X2_MODE);
 
 	/* DPPATC */