drm/vc4: Reject doublescan modes.

[cascardo/linux.git] / drivers / gpu / drm / vc4 / vc4_crtc.c

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index a479d3d..2bfa247 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -536,6 +536,13 @@ static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc,
                                const struct drm_display_mode *mode,
                                struct drm_display_mode *adjusted_mode)
 {
+       /* Do not allow doublescan modes from user space */
+       if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN) {
+               DRM_DEBUG_KMS("[CRTC:%d] Doublescan mode rejected.\n",
+                             crtc->base.id);
+               return false;
+       }
+
        /*
         * Interlaced video modes got CRTC_INTERLACE_HALVE_V applied when
         * coming from user space. We don't want this, as it screws up