[PATCH v4 5/7] drm: rcar-du: lvds: Fix mode for companion encoder

[Fabrizio Castro <fabrizio.castro@bp.renesas.com>]

Primary and companion encoders need to set the same mode for
things to work properly.

rcar_lvds_mode_set gets called into for the primary encoder only,
therefore initialize the companion encoder mode while sorting
the primary encoder mode out.

Fixes: fa440d870358 ("drm: rcar-du: lvds: Add support for dual-link mode")
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>

---
v3->v4:
* New patch extracted from patch:
  "drm: rcar-du: lvds: Add dual-LVDS panels support"
---
 drivers/gpu/drm/rcar-du/rcar_lvds.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index cb2147c..eed5611 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -614,6 +614,18 @@ static void rcar_lvds_mode_set(struct drm_bridge *bridge,
 	lvds->display_mode = *adjusted_mode;
 
 	rcar_lvds_get_lvds_mode(lvds);
+	if (lvds->companion) {
+		struct rcar_lvds *companion_lvds = bridge_to_rcar_lvds(
+							lvds->companion);
+
+		/*
+		 * FIXME: We should not be messing with the companion encoder
+		 * private data from the primary encoder, but since
+		 * rcar_lvds_mode_set gets called into for the primary encoder
+		 * only, we don't have much of a choice for now.
+		 */
+		companion_lvds->mode = lvds->mode;
+	}
 }
 
 static int rcar_lvds_attach(struct drm_bridge *bridge)
-- 
2.7.4