drm: Simplify return value of drm_get_last_vbltimestamp

Imo u32 hints at a register value, but in reality all callers only
care whether the sampled timestamp is precise or not. So give them
just a bool.

Also move the declaration out of drmP.h, it's only used in drm_irq.c.

v2: Also drop the EXPORT_SYMBOL, spotted by Mario.

Cc: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

2 files changed, 15 insertions, 12 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index ad699b729278..15f748c7fa7e 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -55,6 +55,10 @@
  */
 #define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000
 
+static bool
+drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
+                          struct timeval *tvblank, unsigned flags);
+
 /**
  * drm_update_vblank_count - update the master vblank counter
  * @dev: DRM device
@@ -74,7 +78,8 @@
 static void drm_update_vblank_count(struct drm_device *dev, int crtc)
 {
         struct drm_vblank_crtc *vblank = &dev->vblank[crtc];
-        u32 cur_vblank, diff, tslot, rc;
+        u32 cur_vblank, diff, tslot;
+        bool rc;
         struct timeval t_vblank;
 
         /*
@@ -132,7 +137,7 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
         unsigned long irqflags;
         u32 vblcount;
         s64 diff_ns;
-        int vblrc;
+        bool vblrc;
         struct timeval tvblank;
         int count = DRM_TIMESTAMP_MAXRETRIES;
 
@@ -156,7 +161,7 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
          * vblank interrupt is disabled.
          */
         if (!vblank->enabled &&
-            drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0) > 0) {
+            drm_get_last_vbltimestamp(dev, crtc, &tvblank, 0)) {
                 drm_update_vblank_count(dev, crtc);
                 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
                 return;
@@ -204,7 +209,7 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
          * available. In that case we can't account for this and just
          * hope for the best.
          */
-        if ((vblrc > 0) && (abs64(diff_ns) > 1000000)) {
+        if (vblrc && (abs64(diff_ns) > 1000000)) {
                 /* Store new timestamp in ringbuffer. */
                 vblanktimestamp(dev, crtc, vblcount + 1) = tvblank;
 
@@ -781,10 +786,11 @@ static struct timeval get_drm_timestamp(void)
  * call, i.e., it isn't very precisely locked to the true vblank.
  *
  * Returns:
- * Non-zero if timestamp is considered to be very precise, zero otherwise.
+ * True if timestamp is considered to be very precise, false otherwise.
  */
-u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
-                              struct timeval *tvblank, unsigned flags)
+static bool
+drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
+                          struct timeval *tvblank, unsigned flags)
 {
         int ret;
 
@@ -796,7 +802,7 @@ u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
                 ret = dev->driver->get_vblank_timestamp(dev, crtc, &max_error,
                                                         tvblank, flags);
                 if (ret > 0)
-                        return (u32) ret;
+                        return true;
         }
 
         /* GPU high precision timestamp query unsupported or failed.
@@ -804,9 +810,8 @@ u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
          */
         *tvblank = get_drm_timestamp();
 
-        return 0;
+        return false;
 }
-EXPORT_SYMBOL(drm_get_last_vbltimestamp);
 
 /**
  * drm_vblank_count - retrieve "cooked" vblank counter value
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 17a5c10474bd..a97307525c2d 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -1320,8 +1320,6 @@ extern void drm_crtc_vblank_off(struct drm_crtc *crtc);
 extern void drm_crtc_vblank_on(struct drm_crtc *crtc);
 extern void drm_vblank_cleanup(struct drm_device *dev);
 
-extern u32 drm_get_last_vbltimestamp(struct drm_device *dev, int crtc,
-                                     struct timeval *tvblank, unsigned flags);
 extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
                                                  int crtc, int *max_error,
                                                  struct timeval *vblank_time,