drm/kms/radeon: Add support for precise vblank timestamping.

[profile/ivi/kernel-x86-ivi.git] / drivers / gpu / drm / radeon / radeon_kms.c

diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 8fbbe1c..4bf423c 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -277,6 +277,27 @@ void radeon_disable_vblank_kms(struct drm_device *dev, int crtc)
        radeon_irq_set(rdev);
 }
 
+int radeon_get_vblank_timestamp_kms(struct drm_device *dev, int crtc,
+                                   int *max_error,
+                                   struct timeval *vblank_time,
+                                   unsigned flags)
+{
+       struct drm_crtc *drmcrtc;
+       struct radeon_device *rdev = dev->dev_private;
+
+       if (crtc < 0 || crtc >= dev->num_crtcs) {
+               DRM_ERROR("Invalid crtc %d\n", crtc);
+               return -EINVAL;
+       }
+
+       /* Get associated drm_crtc: */
+       drmcrtc = &rdev->mode_info.crtcs[crtc]->base;
+
+       /* Helper routine in DRM core does all the work: */
+       return drm_calc_vbltimestamp_from_scanoutpos(dev, crtc, max_error,
+                                                    vblank_time, flags,
+                                                    drmcrtc);
+}
 
 /*
  * IOCTL.