Re: [PATCH v2 09/13] drm/bridge: lt9611: fix sync polarity for DVI output

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On 08/01/2023 17:56, Dmitry Baryshkov wrote:
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.baryshkov@xxxxxxxxxx>
---
  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);

Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>



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