linux-kernel - [PATCH 2/4] drm/bridge: lt8912b: set hdmi or dvi mode

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Date:   Thu, 22 Sep 2022 14:43:04 +0200
From:   Philippe Schenker <dev@...henker.ch>
To:     dri-devel@...ts.freedesktop.org,
        Adrien Grassein <adrien.grassein@...il.com>
Cc:     Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Robert Foss <robert.foss@...aro.org>,
        linux-kernel@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Philippe Schenker <philippe.schenker@...adex.com>
Subject: [PATCH 2/4] drm/bridge: lt8912b: set hdmi or dvi mode

From: Philippe Schenker <philippe.schenker@...adex.com>

The Lontium LT8912 does have a setting for DVI or HDMI. This patch reads
from EDID what the display needs and sets it accordingly.

Fixes: 30e2ae943c26 ("drm/bridge: Introduce LT8912B DSI to HDMI bridge")
Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>
---

 drivers/gpu/drm/bridge/lontium-lt8912b.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 0fd3472e767c..6a4bb7422176 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -323,6 +323,8 @@ static int lt8912_video_setup(struct lt8912 *lt)
 				  vsync_activehigh ? BIT(0) : 0);
 	ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xab, BIT(1),
 				  hsync_activehigh ? BIT(1) : 0);
+	ret |= regmap_update_bits(lt->regmap[I2C_MAIN], 0xb2, BIT(0),
+				  lt->connector.display_info.is_hdmi ? BIT(0) : 0);
 
 	return ret;
 }
-- 
2.37.3