drm: Fix off-by-one in vblank hardware counter wraparound handling

dev->max_vblank_count contains the largest value that can be represented
by the hardware counter. When the hardware counter wraps around, we have
to add that value + 1 to get the same value as if the hardware counter
didn't wrap around.

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 1967e7f..6f02b4b 100644 (file)
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -130,7 +130,7 @@ static void drm_update_vblank_count(struct drm_device *dev, int crtc)
        /*
         * Interrupts were disabled prior to this call, so deal with counter
         * wrap if needed.
-        * NOTE!  It's possible we lost a full dev->max_vblank_count events
+        * NOTE!  It's possible we lost a full dev->max_vblank_count + 1 events
         * here if the register is small or we had vblank interrupts off for
         * a long time.
         *
@@ -147,7 +147,7 @@ static void drm_update_vblank_count(struct drm_device *dev, int crtc)
        /* Deal with counter wrap */
        diff = cur_vblank - vblank->last;
        if (cur_vblank < vblank->last) {
-               diff += dev->max_vblank_count;
+               diff += dev->max_vblank_count + 1;
 
                DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n",
                          crtc, vblank->last, cur_vblank, diff);