drm: Disable vblank interrupt immediately when drm_vblank_offdelay<0

[mirror_ubuntu-bionic-kernel.git] / Documentation / DocBook / drm.tmpl

diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 1d3756d3176ce58656999f8103a98e6256f9b2a5..55923d00bd52a78b534a842795d65b9e4ff71c8a 100644 (file)
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -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