[Intel-gfx] [PATCH 4/6] drm/i915: Disable FBC across page-flipping
Chris Wilson
chris at chris-wilson.co.uk
Thu Jul 7 13:48:09 CEST 2011
Page-flipping updates the scanout address, nukes the FBC compressed
image and so forces an FBC update so that the displayed image remains
consistent. However, page-flipping does not update the FBC registers
themselves, which remain pointing to both the old address and the old
CPU fence. Future updates to the new front-buffer (scanout) are then
undetected!
This first approach to demonstrate the issue and highlight the fix,
simply disables FBC upon page-flip (a recompression will be forced on
every flip so FBC becomes immaterial) and then re-enables FBC in the
page-flip finish work function, so that the FBC registers are now
pointing to the new framebuffer and front-buffer rendering works once
more.
Ideally, we want to only re-enable FBC after page-flipping is complete,
as otherwise we are just wasting cycles (along with an undesirable
wait-for-vblank which will halve the frame-rate of vsync'ed games) and
power (with needless recompression) whilst the page-flipping application
is still running.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33487
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/intel_display.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8ff0eae..ea085ff 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6131,6 +6131,7 @@ static void intel_unpin_work_fn(struct work_struct *__work)
drm_gem_object_unreference(&work->pending_flip_obj->base);
drm_gem_object_unreference(&work->old_fb_obj->base);
+ intel_update_fbc(work->dev);
mutex_unlock(&work->dev->struct_mutex);
kfree(work);
}
@@ -6495,6 +6496,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
if (ret)
goto cleanup_pending;
+ intel_disable_fbc(dev);
mutex_unlock(&dev->struct_mutex);
trace_i915_flip_request(intel_crtc->plane, obj);
--
1.7.5.4
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