drm/i915: handle non-flip pending case when unpinning the scanout buffer

The first page flip queued will replace the current front buffer, which
should have a 0 pending flip count.  So at finish time we need to handle
that case (i.e. if the flip count is 0 *or* dec_and_test is 0 we need to
wake the waiters).

Also fix up an error path in the queue function and add some debug
output (only enabled with driver debugging).

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 2cc489b..5f14dfb 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3985,6 +3985,12 @@ void intel_finish_page_flip(struct drm_device *dev, int pipe)
        spin_lock_irqsave(&dev->event_lock, flags);
        work = intel_crtc->unpin_work;
        if (work == NULL || !work->pending) {
+               if (work && !work->pending) {
+                       obj_priv = work->obj->driver_private;
+                       DRM_DEBUG_DRIVER("flip finish: %p (%d) not pending?\n",
+                                        obj_priv,
+                                        atomic_read(&obj_priv->pending_flip));
+               }
                spin_unlock_irqrestore(&dev->event_lock, flags);
                return;
        }
@@ -4006,7 +4012,10 @@ void intel_finish_page_flip(struct drm_device *dev, int pipe)
        spin_unlock_irqrestore(&dev->event_lock, flags);
 
        obj_priv = work->obj->driver_private;
-       if (atomic_dec_and_test(&obj_priv->pending_flip))
+
+       /* Initial scanout buffer will have a 0 pending flip count */
+       if ((atomic_read(&obj_priv->pending_flip) == 0) ||
+           atomic_dec_and_test(&obj_priv->pending_flip))
                DRM_WAKEUP(&dev_priv->pending_flip_queue);
        schedule_work(&work->work);
 }
@@ -4019,8 +4028,11 @@ void intel_prepare_page_flip(struct drm_device *dev, int plane)
        unsigned long flags;
 
        spin_lock_irqsave(&dev->event_lock, flags);
-       if (intel_crtc->unpin_work)
+       if (intel_crtc->unpin_work) {
                intel_crtc->unpin_work->pending = 1;
+       } else {
+               DRM_DEBUG_DRIVER("preparing flip with no unpin work?\n");
+       }
        spin_unlock_irqrestore(&dev->event_lock, flags);
 }
 
@@ -4054,6 +4066,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
        /* We borrow the event spin lock for protecting unpin_work */
        spin_lock_irqsave(&dev->event_lock, flags);
        if (intel_crtc->unpin_work) {
+               DRM_DEBUG_DRIVER("flip queue: crtc already busy\n");
                spin_unlock_irqrestore(&dev->event_lock, flags);
                kfree(work);
                mutex_unlock(&dev->struct_mutex);
@@ -4067,7 +4080,10 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 
        ret = intel_pin_and_fence_fb_obj(dev, obj);
        if (ret != 0) {
+               DRM_DEBUG_DRIVER("flip queue: %p pin & fence failed\n",
+                         obj->driver_private);
                kfree(work);
+               intel_crtc->unpin_work = NULL;
                mutex_unlock(&dev->struct_mutex);
                return ret;
        }