drm/bridge: lt9611: fix sync polarity for DVI output

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

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-10-dmitry.baryshkov@linaro.org

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index ab411e4ec7accecce295c31c5acb21a6b34087bf..1ea6436f0b2d6b8d394816301d0fea16e2390392 100644 (file)
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -353,13 +353,16 @@ end:
        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);
 }
 
@@ -720,7 +723,7 @@ 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);