2 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 62377e41745b..b36f815bd1d8 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
@@ -74,7 +74,7 @@ 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_display_mode *mode = &crtc->state->mode;
-        unsigned int hbp, hfp, hsw, vbp, vfp, vsw, div, index;
+        unsigned int hbp, hfp, hsw, vbp, vfp, vsw, div, index, pol = 0;
         unsigned long dcuclk;
 
         index = drm_crtc_index(crtc);
@@ -89,6 +89,12 @@ 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;
 
+        if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+                pol |= DCU_SYN_POL_INV_HS_LOW;
+
+        if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+                pol |= DCU_SYN_POL_INV_VS_LOW;
+
         regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
                      DCU_HSYN_PARA_BP(hbp) |
                      DCU_HSYN_PARA_PW(hsw) |
@@ -101,8 +107,7 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
                      DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
                      DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
         regmap_write(fsl_dev->regmap, DCU_DIV_RATIO, div);
-        regmap_write(fsl_dev->regmap, DCU_SYN_POL,
-                     DCU_SYN_POL_INV_VS_LOW | DCU_SYN_POL_INV_HS_LOW);
+        regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
         regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
                      DCU_BGND_G(0) | DCU_BGND_B(0));
         regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index f88a631c43ab..2164c999052c 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1016,6 +1016,7 @@ static const struct drm_display_mode nec_nl4827hc19_05b_mode = {
         .vsync_end = 272 + 2 + 4,
         .vtotal = 272 + 2 + 4 + 2,
         .vrefresh = 74,
+        .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
 };
 
 static const struct panel_desc nec_nl4827hc19_05b = {