drm/i915/dsi: Execute MIPI_SEQ_TEAR_OFF from intel_dsi_post_disable

For v3+ VBTs we should call MIPI_SEQ_TEAR_OFF before MIPI_SEQ_DISPLAY_OFF,
v2 VBTs do not have MIPI_SEQ_TEAR_OFF so there this is a nop.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1488374106-4949-9-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/i915/intel_dsi.c

@@ -921,6 +921,8 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder,
 	 * if disable packets are sent before sending shutdown packet then in
 	 * some next enable sequence send turn on packet error is observed
 	 */
+	if (is_cmd_mode(intel_dsi))
+		intel_dsi_exec_vbt_sequence(intel_dsi, MIPI_SEQ_TEAR_OFF);
 	intel_dsi_exec_vbt_sequence(intel_dsi, MIPI_SEQ_DISPLAY_OFF);
 
 	/* Transition to LP-00 */