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From:   Fabrizio Castro <fabrizio.castro@bp.renesas.com>
To:     Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
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Cc:     Fabrizio Castro <fabrizio.castro@bp.renesas.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        Simon Horman <horms@verge.net.au>,
        Magnus Damm <magnus.damm@gmail.com>,
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        Chris Paterson <Chris.Paterson2@renesas.com>,
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Subject: [PATCH v4 5/7] drm: rcar-du: lvds: Fix mode for companion encoder
Date:   Fri,  6 Dec 2019 16:32:52 +0000
Message-Id: <1575649974-31472-6-git-send-email-fabrizio.castro@bp.renesas.com>
In-Reply-To: <1575649974-31472-1-git-send-email-fabrizio.castro@bp.renesas.com>
References: <1575649974-31472-1-git-send-email-fabrizio.castro@bp.renesas.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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