drm/irq: Unexport drm_vblank_count

No one outside of drm_irq.c should ever need this. The correct way to
implement get_vblank_count for hw lacking a vblank counter is
drm_vblank_no_hw_counter. Fix this up in mtk, which is the only
offender left over.

Cc: CK Hu <ck.hu@mediatek.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161114090255.31595-4-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_irq.c

@@ -234,6 +234,16 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
 	store_vblank(dev, pipe, diff, &t_vblank, cur_vblank);
 }
 
+static u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe)
+{
+	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
+
+	if (WARN_ON(pipe >= dev->num_crtcs))
+		return 0;
+
+	return vblank->count;
+}
+
 /**
  * drm_accurate_vblank_count - retrieve the master vblank counter
  * @crtc: which counter to retrieve
@@ -887,31 +897,6 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
 	return false;
 }
 
-/**
- * drm_vblank_count - retrieve "cooked" vblank counter value
- * @dev: DRM device
- * @pipe: index of CRTC for which to retrieve the counter
- *
- * Fetches the "cooked" vblank count value that represents the number of
- * vblank events since the system was booted, including lost events due to
- * modesetting activity.
- *
- * This is the legacy version of drm_crtc_vblank_count().
- *
- * Returns:
- * The software vblank counter.
- */
-u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe)
-{
-	struct drm_vblank_crtc *vblank = &dev->vblank[pipe];
-
-	if (WARN_ON(pipe >= dev->num_crtcs))
-		return 0;
-
-	return vblank->count;
-}
-EXPORT_SYMBOL(drm_vblank_count);
-
 /**
  * drm_crtc_vblank_count - retrieve "cooked" vblank counter value
  * @crtc: which counter to retrieve
@@ -920,8 +905,6 @@ EXPORT_SYMBOL(drm_vblank_count);
  * vblank events since the system was booted, including lost events due to
  * modesetting activity.
  *
- * This is the native KMS version of drm_vblank_count().
- *
  * Returns:
  * The software vblank counter.
  */

drivers/gpu/drm/mediatek/mtk_drm_drv.c

@@ -256,7 +256,7 @@ static struct drm_driver mtk_drm_driver = {
 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 			   DRIVER_ATOMIC,
 
-	.get_vblank_counter = drm_vblank_count,
+	.get_vblank_counter = drm_vblank_no_hw_counter,
 	.enable_vblank = mtk_drm_crtc_enable_vblank,
 	.disable_vblank = mtk_drm_crtc_disable_vblank,