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Message-Id: <1575649974-31472-6-git-send-email-fabrizio.castro@bp.renesas.com>
Date:   Fri,  6 Dec 2019 16:32:52 +0000
From:   Fabrizio Castro <fabrizio.castro@...renesas.com>
To:     Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Sean Paul <sean@...rly.run>,
        Andrzej Hajda <a.hajda@...sung.com>
Cc:     Fabrizio Castro <fabrizio.castro@...renesas.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        ebiharaml@...linux.co.jp
Subject: [PATCH v4 5/7] drm: rcar-du: lvds: Fix mode for companion encoder

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@...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

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