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drm: Disable vblank interrupt immediately when drm_vblank_offdelay<0

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Make drm_vblank_put() disable the vblank interrupt immediately when the
refcount drops to zero and drm_vblank_offdelay<0.

v2: Preserve the current drm_vblank_offdelay==0 'never disable' behaviur

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä
2014-08-06 14:49:53 +03:00
committed by Daniel Vetter
parent ffe7c73a8d
commit 4ed0ce3d0b
4 changed files with 11 additions and 7 deletions
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Documentation/DocBook/drm.tmpl
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@@ -3386,6 +3386,7 @@ void (*disable_vblank) (struct drm_device *dev, int crtc);</synopsis>
by scheduling a timer. The delay is accessible through the vblankoffdelay
module parameter or the <varname>drm_vblank_offdelay</varname> global
variable and expressed in milliseconds. Its default value is 5000 ms.
Zero means never disable, and a negative value means disable immediately.
</para>
<para>
When a vertical blanking interrupt occurs drivers only need to call the