From: Oleg Vasilev Date: Thu, 13 Jun 2019 12:18:00 +0000 (+0300) Subject: drm: add debug print to update_vblank_count X-Git-Tag: v5.3-rc1~22^2~20^2~35 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=41ff5bd834356a310ad909152f19bf23963527ce;p=linux-block.git 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 Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20190613121802.2193-1-oleg.vasilev@intel.com --- diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c index 0d704bddb1a6..603ab105125d 100644 --- a/drivers/gpu/drm/drm_vblank.c +++ b/drivers/gpu/drm/drm_vblank.c @@ -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;