X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=drivers%2Fgpu%2Fdrm%2Fradeon%2Fatombios_encoders.c;h=587cae4e73c9abeeb65d2187b9e700bb8f0fa442;hb=3104b8128d4d646a574ed9d5b17c7d10752cd70b;hp=edd05cdb0cd843dfe9ee53ecbac7f4a8908d3dd2;hpb=968f3e374faf41e5e6049399eb7302777a09a1e8;p=deliverable%2Flinux.git

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index edd05cdb0cd8..587cae4e73c9 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -310,6 +310,10 @@ static bool radeon_atom_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 (radeon_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT)) {
 		radeon_panel_mode_fixup(encoder, adjusted_mode);