3 files changed, 9 insertions, 3 deletions

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
index 365809edf29a..89c0084c2814 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
@@ -66,6 +66,7 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
 {
         struct drm_device *dev = crtc->dev;
         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
+        struct drm_connector *con = &fsl_dev->connector.base;
         struct drm_display_mode *mode = &crtc->state->mode;
         unsigned int hbp, hfp, hsw, vbp, vfp, vsw, index, pol = 0;
 
@@ -80,6 +81,10 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
         vfp = mode->vsync_start - mode->vdisplay;
         vsw = mode->vsync_end - mode->vsync_start;
 
+        /* INV_PXCK as default (most display sample data on rising edge) */
+        if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE))
+                pol |= DCU_SYN_POL_INV_PXCK;
+
         if (mode->flags & DRM_MODE_FLAG_NHSYNC)
                 pol |= DCU_SYN_POL_INV_HS_LOW;
 
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
index 5bb7c261fe95..c275f900ff23 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
@@ -47,8 +47,8 @@
 #define DCU_VSYN_PARA_FP(x)             (x)
 
 #define DCU_SYN_POL                     0x0024
-#define DCU_SYN_POL_INV_PXCK_FALL       (0 << 6)
-#define DCU_SYN_POL_NEG_REMAIN          (0 << 5)
+#define DCU_SYN_POL_INV_PXCK            BIT(6)
+#define DCU_SYN_POL_NEG                 BIT(5)
 #define DCU_SYN_POL_INV_VS_LOW          BIT(1)
 #define DCU_SYN_POL_INV_HS_LOW          BIT(0)
 
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 77ae07f28b7b..b19c88f188b0 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1053,7 +1053,8 @@ static const struct panel_desc nec_nl4827hc19_05b = {
                 .width = 95,
                 .height = 54,
         },
-        .bus_format = MEDIA_BUS_FMT_RGB888_1X24
+        .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+        .bus_flags = DRM_BUS_FLAG_PIXDATA_POSEDGE,
 };
 
 static const struct display_timing okaya_rs800480t_7x0gp_timing = {