drm: add debug print to update_vblank_count (41ff5bd8) · Commits · 戴 / test

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

drivers/gpu/drm/drm_vblank.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -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.
		*/
		diff = DIV_ROUND_CLOSEST_ULL(diff_ns, framedur_ns);

		if (diff == 0 && in_vblank_irq)
		DRM_DEBUG_VBL("crtc %u: Redundant vblirq ignored."
		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\n",
		pipe);
		} else {
		/* some kind of default for drivers w/o accurate vbl timestamping */
		diff = in_vblank_irq ? 1 : 0;

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