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drm: add debug print to update_vblank_count

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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
This commit is contained in:
Oleg Vasilev 2019-06-13 15:18:00 +03:00 committed by Ville Syrjälä
parent a0e93c41eb
commit 41ff5bd834
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/drm_vblank.c
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@ -241,12 +241,16 @@ static void drm_update_vblank_count(struct drm_device *dev, unsigned int pipe,
* on the difference in the timestamps and the
* frame/field duration.
*/
DRM_DEBUG_VBL("crtc %u: Calculating number of vblanks."
" diff_ns = %lld, framedur_ns = %d)\n",
pipe, (long long) diff_ns, framedur_ns);
diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);
if (diff == 0 && in_vblank_irq)
DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
" diff_ns = %lld, framedur_ns = %d)\n",
pipe, (long long) diff_ns, framedur_ns);
DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored\n",
pipe);
} else {
/* some kind of default for drivers w/o accurate vbl timestamping */
diff = in_vblank_irq ? 1 : 0;