drm/bridge: lt9611: fix polarity programming

Fix programming of hsync and vsync polarities

Fixes: 23278bf54afe ("drm/bridge: Introduce LT9611 DSI to HDMI bridge")
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/20230118081658.2198520-4-dmitry.baryshkov@linaro.org

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
index fc58691..d6c08c8 100644 (file)
--- a/drivers/gpu/drm/bridge/lontium-lt9611.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
@@ -207,7 +207,6 @@ static void lt9611_pcr_setup(struct lt9611 *lt9611, const struct drm_display_mod
 
                /* stage 2 */
                { 0x834a, 0x40 },
-               { 0x831d, 0x10 },
 
                /* MK limit */
                { 0x832d, 0x38 },
@@ -222,11 +221,19 @@ 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:
@@ -236,7 +243,7 @@ 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;
        }