linux-kernel - [PATCH/RFC 07/12] drm: rcar-du: lvds: Add support for dual link panels

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Message-Id: <1564731249-22671-8-git-send-email-fabrizio.castro@bp.renesas.com>
Date:   Fri,  2 Aug 2019 08:34:04 +0100
From:   Fabrizio Castro <fabrizio.castro@...renesas.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Fabrizio Castro <fabrizio.castro@...renesas.com>,
        dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Simon Horman <horms@...ge.net.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>
Subject: [PATCH/RFC 07/12] drm: rcar-du: lvds: Add support for dual link panels

If the display comes with two ports, assume it supports dual
link.

Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
---
 drivers/gpu/drm/rcar-du/rcar_lvds.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 2d54ae5..97c51c2 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -751,6 +751,9 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
 			ret = -EPROBE_DEFER;
 			goto done;
 		}
+		if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK)
+			lvds->dual_link = of_graph_get_endpoint_count(remote)
+					== 2;
 	}
 
 	if (lvds->dual_link) {
-- 
2.7.4