+u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+ int reg = pipe ? PIPEB_FRMCOUNT_GM45 : PIPEA_FRMCOUNT_GM45;
+
+ if (!i915_pipe_enabled(dev, pipe)) {
+ DRM_ERROR("trying to get vblank count for disabled pipe %d\n", pipe);
+ return 0;
+ }
+
+ return I915_READ(reg);
+}
+