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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-07-08 12:22:41 +0100 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2011-07-08 10:23:15 -0700 |
| commit | 7782de3bd671657674e7baba854f0fd43e9f86bc (patch) | |
| tree | 9969ffe609a8115ae571f1dbfbc4077be4089bdd /drivers/gpu | |
| parent | 9ce9d0695d15da23ffe817516ba5d0b58caf8d05 (diff) | |
| download | blackbird-op-linux-7782de3bd671657674e7baba854f0fd43e9f86bc.tar.gz blackbird-op-linux-7782de3bd671657674e7baba854f0fd43e9f86bc.zip | |
drm/i915: Disable FBC across page-flipping
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 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@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | 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 9df96bdc002e..f0788a97801e 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -6333,6 +6333,7 @@ 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); } @@ -6697,6 +6698,7 @@ 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); |
