drm/i915/dsi: disable lpdt if it is not enabled

Avoid setting LP_DATA_TRANSFER when enable_lpdt is false

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Lee Shawn C <shawn.c.lee@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>
Signed-off-by: William Tseng <william.tseng@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211109034125.11291-1-william.tseng@intel.com

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

@@ -183,6 +183,8 @@ static int dsi_send_pkt_hdr(struct intel_dsi_host *host,
 
 	if (enable_lpdt)
 		tmp |= LP_DATA_TRANSFER;
+	else
+		tmp &= ~LP_DATA_TRANSFER;
 
 	tmp &= ~(PARAM_WC_MASK | VC_MASK | DT_MASK);
 	tmp |= ((packet->header[0] & VC_MASK) << VC_SHIFT);