Patch "drm/bridge: lt9611: fix polarity programming" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/bridge: lt9611: fix polarity programming

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-bridge-lt9611-fix-polarity-programming.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6769197b159b205f3fcef71b718865b35bcec2aa
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date:   Wed Jan 18 10:16:48 2023 +0200

    drm/bridge: lt9611: fix polarity programming
    
    [ Upstream commit 0b157efa384ea417304b1da284ee2f603c607fc3 ]
    
    Fix programming of hsync and vsync polarities
    
    Fixes: 23278bf54afe ("drm/bridge: Introduce LT9611 DSI to HDMI bridge")
    Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
    Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
    Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-4-dmitry.baryshkov@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index fe660d667daf6..4c56407c4cf04 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -205,7 +205,6 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mod
 
 		/* stage 2 */
 		{ 0x834a, 0x40 },
-		{ 0x831d, 0x10 },
 
 		/* MK limit */
 		{ 0x832d, 0x38 },
@@ -220,11 +219,19 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mod
 		{ 0x8325, 0x00 },
 		{ 0x832a, 0x01 },
 		{ 0x834a, 0x10 },
-		{ 0x831d, 0x10 },
-		{ 0x8326, 0x37 },
 	};
+	u8 pol = 0x10;
 
-	regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+		pol |= 0x2;
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+		pol |= 0x1;
+	regmap_write(lt9611->regmap, 0x831d, pol);
+
+	if (mode->hdisplay == 3840)
+		regmap_multi_reg_write(lt9611->regmap, reg_cfg2, ARRAY_SIZE(reg_cfg2));
+	else
+		regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
 
 	switch (mode->hdisplay) {
 	case 640:
@@ -234,7 +241,7 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mod
 		regmap_write(lt9611->regmap, 0x8326, 0x37);
 		break;
 	case 3840:
-		regmap_multi_reg_write(lt9611->regmap, reg_cfg2, ARRAY_SIZE(reg_cfg2));
+		regmap_write(lt9611->regmap, 0x8326, 0x37);
 		break;
 	}