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drm: add debug print to update_vblank_count
Since we are logging all vblank counter updates 30 lines below, it is also good to have some details whether and how vblank count difference is calculated. Signed-off-by: Oleg Vasilev <oleg.vasilev@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190613121802.2193-1-oleg.vasilev@intel.com
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1 changed files with 7 additions and 3 deletions
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@ -241,12 +241,16 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
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* on the difference in the timestamps and the
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* frame/field duration.
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*/
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DRM_DEBUG_VBL("crtc %u: Calculating number of vblanks."
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" diff_ns = %lld, framedur_ns = %d)\n",
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pipe, (long long) diff_ns, framedur_ns);
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diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
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if (diff == 0 && in_vblank_irq)
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DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
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" diff_ns = %lld, framedur_ns = %d)\n",
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pipe, (long long) diff_ns, framedur_ns);
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DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored\n",
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pipe);
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} else {
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/* some kind of default for drivers w/o accurate vbl timestamping */
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diff = in_vblank_irq ? 1 : 0;
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