drm/rockchip: vop: restore BCSH state when exit from suspend state

when vop enter suspend state all the register will be restore to init
value, so when resume we need to config the BCSH register, and the
vop->mode_update parameter can indicate this condition.

Change-Id: Ifd5e7eb406e0ac56c11f74391290348600211e89
Signed-off-by: Sandy Huang <hjc@rock-chips.com>

Author: sandy-huang

drivers/gpu/drm/rockchip/rockchip_drm_vop.c

@@ -3243,10 +3243,18 @@ static void vop_tv_config_update(struct drm_crtc *crtc,
 
 	if (!s->tv_state)
 		return;
-
+	/*
+	 * The BCSH only need to config once except one of the following
+	 * condition changed:
+	 *   1. tv_state: include brightness,contrast,saturation and hue;
+	 *   2. yuv_overlay: it is related to BCSH r2y module;
+	 *   3. mode_update: it is indicate mode change and resume from suspend;
+	 *   4. bcsh_en: control the BCSH module enable or disable state;
+	 *   5. bus_format: it is related to BCSH y2r module;
+	 */
 	if (!memcmp(s->tv_state,
 		    &vop->active_tv_state, sizeof(*s->tv_state)) &&
-	    s->yuv_overlay == old_s->yuv_overlay &&
+	    s->yuv_overlay == old_s->yuv_overlay && vop->mode_update &&
 	    s->bcsh_en == old_s->bcsh_en && s->bus_format == old_s->bus_format)
 		return;