[PATCH 3/5] drm/vblank: Remove unused drm_crtc_vblank_count_and_time

[linux@treblig.org]

From: "Dr. David Alan Gilbert" <linux@treblig.org>

drm_crtc_vblank_count_and_time() was explicitly added by
commit cf6483050e9b ("drm/irq: Add drm_crtc_vblank_count_and_time()")
in 2015, but never used.

Remove it, and rework comments that reference it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
---
 drivers/gpu/drm/drm_vblank.c | 44 +++++++-----------------------------
 include/drm/drm_vblank.h     | 10 ++++----
 2 files changed, 12 insertions(+), 42 deletions(-)

diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 94e45ed6869d..67d6367e9f4b 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -908,10 +908,10 @@ drm_get_last_vbltimestamp(struct drm_device *dev, unsigned int pipe,
  * drm_crtc_accurate_vblank_count() for such use-cases.
  *
  * Note that for a given vblank counter value drm_crtc_handle_vblank()
- * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time()
- * provide a barrier: Any writes done before calling
- * drm_crtc_handle_vblank() will be visible to callers of the later
- * functions, if the vblank count is the same or a later one.
+ * and drm_crtc_vblank_count() provide a barrier:
+ * Any writes done before calling drm_crtc_handle_vblank() will be
+ * visible to callers of the later functions, if the vblank count is
+ * the same or a later one.
  *
  * See also &drm_vblank_crtc.count.
  *
@@ -936,7 +936,6 @@ EXPORT_SYMBOL(drm_crtc_vblank_count);
  * modesetting activity. Returns corresponding system timestamp of the time
  * of the vblank interval that corresponds to the current vblank counter value.
  *
- * This is the legacy version of drm_crtc_vblank_count_and_time().
  */
 static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
 				     ktime_t *vblanktime)
@@ -959,33 +958,6 @@ static u64 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
 	return vblank_count;
 }
 
-/**
- * drm_crtc_vblank_count_and_time - retrieve "cooked" vblank counter value
- *     and the system timestamp corresponding to that vblank counter value
- * @crtc: which counter to retrieve
- * @vblanktime: Pointer to time to receive the vblank timestamp.
- *
- * 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. Returns corresponding system timestamp of the time
- * of the vblank interval that corresponds to the current vblank counter value.
- *
- * Note that for a given vblank counter value drm_crtc_handle_vblank()
- * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time()
- * provide a barrier: Any writes done before calling
- * drm_crtc_handle_vblank() will be visible to callers of the later
- * functions, if the vblank count is the same or a later one.
- *
- * See also &drm_vblank_crtc.count.
- */
-u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
-				   ktime_t *vblanktime)
-{
-	return drm_vblank_count_and_time(crtc->dev, drm_crtc_index(crtc),
-					 vblanktime);
-}
-EXPORT_SYMBOL(drm_crtc_vblank_count_and_time);
-
 /**
  * drm_crtc_next_vblank_start - calculate the time of the next vblank
  * @crtc: the crtc for which to calculate next vblank time
@@ -1978,10 +1950,10 @@ EXPORT_SYMBOL(drm_handle_vblank);
  * This is the native KMS version of drm_handle_vblank().
  *
  * Note that for a given vblank counter value drm_crtc_handle_vblank()
- * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time()
- * provide a barrier: Any writes done before calling
- * drm_crtc_handle_vblank() will be visible to callers of the later
- * functions, if the vblank count is the same or a later one.
+ * and drm_crtc_vblank_count() * provide a barrier:
+ * Any writes done before calling * drm_crtc_handle_vblank() will be
+ * visible to callers of the later functions, if the vblank count is
+ * the same or a later one.
  *
  * See also &drm_vblank_crtc.count.
  *
diff --git a/include/drm/drm_vblank.h b/include/drm/drm_vblank.h
index 151ab1e85b1b..572e54425970 100644
--- a/include/drm/drm_vblank.h
+++ b/include/drm/drm_vblank.h
@@ -141,10 +141,10 @@ struct drm_vblank_crtc {
 	 * Current software vblank counter.
 	 *
 	 * Note that for a given vblank counter value drm_crtc_handle_vblank()
-	 * and drm_crtc_vblank_count() or drm_crtc_vblank_count_and_time()
-	 * provide a barrier: Any writes done before calling
-	 * drm_crtc_handle_vblank() will be visible to callers of the later
-	 * functions, iff the vblank count is the same or a later one.
+	 * and drm_crtc_vblank_count() provide a barrier:
+	 * Any writes done before calling drm_crtc_handle_vblank() will be
+	 * visible to callers of the later functions, iff the vblank count is
+	 * the same or a later one.
 	 *
 	 * IMPORTANT: This guarantee requires barriers, therefor never access
 	 * this field directly. Use drm_crtc_vblank_count() instead.
@@ -260,8 +260,6 @@ struct drm_vblank_crtc *drm_crtc_vblank_crtc(struct drm_crtc *crtc);
 int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
 bool drm_dev_has_vblank(const struct drm_device *dev);
 u64 drm_crtc_vblank_count(struct drm_crtc *crtc);
-u64 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
-				   ktime_t *vblanktime);
 int drm_crtc_next_vblank_start(struct drm_crtc *crtc, ktime_t *vblanktime);
 void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
 			       struct drm_pending_vblank_event *e);
-- 
2.47.0