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drm: Add dev->vblank_disable_immediate flag

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Add a flag to drm_device which will cause the vblank code to bypass the
disable timer and always disable the vblank interrupt immediately when
the last reference is dropped.

v2: Add some notes about the flag to the kernel doc

Reviewed-by: Matt Roper <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
This commit is contained in:
Ville Syrjälä 2014-08-06 14:49:54 +03:00 • committed by Daniel Vetter
commit 00185e6670
3 changed files with 17 additions and 1 deletions
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6
Documentation/DocBook/drm.tmpl
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@ -3387,6 +3387,12 @@ void (*disable_vblank) (struct drm_device *dev, int crtc);</synopsis>
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.
Drivers may override the behaviour by setting the
<structname>drm_device</structname>
<structfield>vblank_disable_immediate</structfield> flag, which when set
causes vblank interrupts to be disabled immediately regardless of the
drm_vblank_offdelay value. The flag should only be set if there's a
properly working hardware vblank counter present.
</para>
<para>
When a vertical blanking interrupt occurs drivers only need to call the