drm/bridge: lt8912b: set hdmi or dvi mode

[ Upstream commit 6dd1de12e1243f2013e4fabf31e99e63b1a860d0 ]

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@toradex.com>
Acked-by: Adrien Grassein <adrien.grassein@gmail.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220922124306.34729-3-dev@pschenker.ch
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index 0fae72d..6e04d51 100644 (file)
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -321,6 +321,8 @@ 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;
 }