void drm_calc_timestamping_constants(struct drm_crtc *crtc,
const struct drm_display_mode *mode)
{
- struct drm_vblank_crtc *vblank = &crtc->dev->vblank[drm_crtc_index(crtc)];
+ struct drm_device *dev = crtc->dev;
+ unsigned int pipe = drm_crtc_index(crtc);
+ struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
int linedur_ns = 0, framedur_ns = 0;
int dotclock = mode->crtc_clock;
+ if (!dev->num_crtcs)
+ return;
+
+ if (WARN_ON(pipe >= dev->num_crtcs))
+ return;
+
/* Valid dotclock? */
if (dotclock > 0) {
int frame_size = mode->crtc_htotal * mode->crtc_vtotal;