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authorVille Syrjälä <ville.syrjala@linux.intel.com>2017-10-23 18:25:40 +0300
committerVille Syrjälä <ville.syrjala@linux.intel.com>2017-11-07 21:07:02 +0200
commita111fbc4c44d2981f1a8fef64418685be5e30280 (patch)
tree26d73e11f6eebf83bd7a166b0a15ad6cc8fbb0c0
parent30cfcf01665f3c8d8dc3ebb3dfb1a8248f53404a (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.c4
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);

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