[PATCH 09/12] drm/bridge: lt9611: fix sync polarity for DVI output

[Dmitry Baryshkov]

Attaching DVI sink to the lt9611 requires different setup. Fix the
register write to make the DVI displays sync onto the correct sync
pulse.

Signed-off-by: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
---
 drivers/gpu/drm/bridge/lontium-lt9611.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c 
b/drivers/gpu/drm/bridge/lontium-lt9611.c
index 773d7a56f86f..7f9be74acf0d 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -352,13 +352,16 @@ static int lt9611_video_check(struct lt9611 *lt9611)
        return temp;
 }
 
-static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611)
+static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611, bool is_hdmi)
 {
        regmap_write(lt9611->regmap, 0x8443, 0x46 - lt9611->vic);
        regmap_write(lt9611->regmap, 0x8447, lt9611->vic);
        regmap_write(lt9611->regmap, 0x843d, 0x0a); /* UD1 infoframe */
 
-       regmap_write(lt9611->regmap, 0x82d6, 0x8c);
+       if (is_hdmi)
+               regmap_write(lt9611->regmap, 0x82d6, 0x8c);
+       else
+               regmap_write(lt9611->regmap, 0x82d6, 0x0c);
        regmap_write(lt9611->regmap, 0x82d7, 0x04);
 }
 
@@ -719,7 +722,7 @@ lt9611_bridge_atomic_enable(struct drm_bridge *bridge,
        }
 
        lt9611_mipi_input_analog(lt9611);
-       lt9611_hdmi_tx_digital(lt9611);
+       lt9611_hdmi_tx_digital(lt9611, connector->display_info.is_hdmi);
        lt9611_hdmi_tx_phy(lt9611);
 
        msleep(500);
-- 
2.39.0