diff --git a/drivers/video/fbdev/msm/mdss_dsi_host.c b/drivers/video/fbdev/msm/mdss_dsi_host.c
index a810708f7b95..847cbe3dd1a0 100644
--- a/drivers/video/fbdev/msm/mdss_dsi_host.c
+++ b/drivers/video/fbdev/msm/mdss_dsi_host.c
@@ -1395,7 +1395,9 @@ do_send:
 		if (ctrl_rev >= MDSS_DSI_HW_REV_101) {
 			/* clear the RDBK_DATA registers */
 			MIPI_OUTP(ctrl->ctrl_base + 0x01d4, 0x1);
+			wmb(); /* make sure the RDBK registers are cleared */
 			MIPI_OUTP(ctrl->ctrl_base + 0x01d4, 0x0);
+			wmb(); /* make sure the RDBK registers are cleared */
 		}
 
 		mdss_dsi_wait4video_eng_busy(ctrl);	/* video mode only */