1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
index 1e0bba29e167..1cd6de575305 100644
--- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
@@ -298,6 +298,10 @@ bool amdgpu_atombios_encoder_mode_fixup(struct drm_encoder *encoder,
             && (mode->crtc_vsync_start < (mode->crtc_vdisplay + 2)))
                 adjusted_mode->crtc_vsync_start = adjusted_mode->crtc_vdisplay + 2;
 
+        /* vertical FP must be at least 1 */
+        if (mode->crtc_vsync_start == mode->crtc_vdisplay)
+                adjusted_mode->crtc_vsync_start++;
+
         /* get the native mode for scaling */
         if (amdgpu_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT))
                 amdgpu_panel_mode_fixup(encoder, adjusted_mode);