diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2017-10-23 18:25:40 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2017-11-07 21:07:02 +0200 |
| commit | a111fbc4c44d2981f1a8fef64418685be5e30280 (patch) | |
| tree | 26d73e11f6eebf83bd7a166b0a15ad6cc8fbb0c0 | |
| parent | 30cfcf01665f3c8d8dc3ebb3dfb1a8248f53404a (diff) | |
drm/vblank: Tune drm_crtc_accurate_vblank_count() WARN down to a debugdrm-misc-next-fixes-2017-11-08
Since commit 632c6e4edef1 ("drm/vblank: Fix flip event vblank count")
even drivers that don't implement accurate vblank timestamps will end
up using drm_crtc_accurate_vblank_count(). That leads to a WARN every
time drm_crtc_arm_vblank_event() gets called. The could be as often
as every frame for each active crtc.
Considering drm_crtc_accurate_vblank_count() is never any worse than
the drm_vblank_count() we used previously, let's just skip the WARN
unless DRM_UT_VBL is enabled. That way people won't be bothered by
this unless they're debugging vblank code. And let's also change it
to WARN_ONCE() so that even when you're debugging vblank code you
won't get drowned by constant WARNs.
Cc: stable@vger.kernel.org
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: "Szyprowski, Marek" <m.szyprowski@samsung.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Reported-by: Andrzej Hajda <a.hajda@samsung.com>
Fixes: 632c6e4edef1 ("drm/vblank: Fix flip event vblank count")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171023152540.15364-1-ville.syrjala@linux.intel.com
Acked-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
| -rw-r--r-- | drivers/gpu/drm/drm_vblank.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index 57cc6e37c810..09c1c4ff93ca 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -299,8 +299,8 @@ u32 drm_crtc_accurate_vblank_count(struct drm_crtc *crtc) u32 vblank; unsigned long flags; - WARN(!dev->driver->get_vblank_timestamp, - "This function requires support for accurate vblank timestamps."); + WARN_ONCE(drm_debug & DRM_UT_VBL && !dev->driver->get_vblank_timestamp, + "This function requires support for accurate vblank timestamps."); spin_lock_irqsave(&dev->vblank_time_lock, flags); |