From: Ville Syrjälä <ville.syrj...@linux.intel.com>
intel_pipe_set_base() never actually waited for any pending page flips
on the CRTC. It looks like it tried to, by calling intel_finish_fb() on
the current front buffer. But the pending flips were actually tracked
in the BO of the previous front buffer, so the call to intel_finish_fb()
never did anything useful.
intel_crtc_wait_for_pending_flips() is the current _working_ way to wait
for pending page flips. So use it in intel_pipe_set_base() too. Some
refactoring was necessary to avoid locking struct_mutex twice.
v2: Shuffle the code around so that intel_crtc_wait_for_pending_flips()
just wraps intel_crtc_wait_for_pending_flips_locked().
v3: Kill leftover wait_event() in intel_finish_fb()
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_display.c | 80 +++++++++++++++++----------------
1 files changed, 41 insertions(+), 39 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 8c2d810..ea710af 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2238,10 +2238,6 @@ intel_finish_fb(struct drm_framebuffer *old_fb)
bool was_interruptible = dev_priv->mm.interruptible;
int ret;
- wait_event(dev_priv->pending_flip_queue,
- i915_reset_in_progress(&dev_priv->gpu_error) ||
- atomic_read(&obj->pending_flip) == 0);
-
/* Big Hammer, we also need to ensure that any pending
* MI_WAIT_FOR_EVENT inside a user batch buffer on the
* current scanout is retired before unpinning the old
@@ -2284,6 +2280,46 @@ static void intel_crtc_update_sarea_pos(struct drm_crtc
*crtc, int x, int y)
}
}
+static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ unsigned long flags;
+ bool pending;
+
+ if (i915_reset_in_progress(&dev_priv->gpu_error))
+ return false;
+
+ spin_lock_irqsave(&dev->event_lock, flags);
+ pending = to_intel_crtc(crtc)->unpin_work != NULL;
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+
+ return pending;
+}
+
+static void intel_crtc_wait_for_pending_flips_locked(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (crtc->fb == NULL)
+ return;
+
+ wait_event(dev_priv->pending_flip_queue,
+ !intel_crtc_has_pending_flip(crtc));
+
+ intel_finish_fb(crtc->fb);
+}
+
+static void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+
+ mutex_lock(&dev->struct_mutex);
+ intel_crtc_wait_for_pending_flips_locked(crtc);
+ mutex_unlock(&dev->struct_mutex);
+}
+
static int
intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
struct drm_framebuffer *fb)
@@ -2317,8 +2353,7 @@ intel_pipe_set_base(struct drm_crtc *crtc, int x, int y,
return ret;
}
- if (crtc->fb)
- intel_finish_fb(crtc->fb);
+ intel_crtc_wait_for_pending_flips_locked(crtc);
ret = dev_priv->display.update_plane(crtc, fb, x, y);
if (ret) {
@@ -2950,39 +2985,6 @@ static void ironlake_fdi_disable(struct drm_crtc *crtc)
udelay(100);
}
-static bool intel_crtc_has_pending_flip(struct drm_crtc *crtc)
-{
- struct drm_device *dev = crtc->dev;
- struct drm_i915_private *dev_priv = dev->dev_private;
- unsigned long flags;
- bool pending;
-
- if (i915_reset_in_progress(&dev_priv->gpu_error))
- return false;
-
- spin_lock_irqsave(&dev->event_lock, flags);
- pending = to_intel_crtc(crtc)->unpin_work != NULL;
- spin_unlock_irqrestore(&dev->event_lock, flags);
-
- return pending;
-}
-
-static void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc)
-{
- struct drm_device *dev = crtc->dev;
- struct drm_i915_private *dev_priv = dev->dev_private;
-
- if (crtc->fb == NULL)
- return;
-
- wait_event(dev_priv->pending_flip_queue,
- !intel_crtc_has_pending_flip(crtc));
-
- mutex_lock(&dev->struct_mutex);
- intel_finish_fb(crtc->fb);
- mutex_unlock(&dev->struct_mutex);
-}
-
static bool ironlake_crtc_driving_pch(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
--
1.7.8.6
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