drm/radeon: make sure vertical front porch is at least 1
authorAlex Deucher <alexander.deucher@amd.com>
Mon, 2 May 2016 22:53:27 +0000 (18:53 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Tue, 3 May 2016 18:50:54 +0000 (14:50 -0400)
hw doesn't like a 0 value.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
drivers/gpu/drm/radeon/atombios_encoders.c

index edd05cdb0cd843dfe9ee53ecbac7f4a8908d3dd2..587cae4e73c9abeeb65d2187b9e700bb8f0fa442 100644 (file)
@@ -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);