2d1980b2b3a05da3634c45cae81085975176d501

When there is a race condition between DMS seamless transition and drm_wait_vblank_ioctl, the latter gets deregistered for vblank handle as drm_crtc_vblank_on call in crtc enbale increments vblank count. This change avoids drm_crtc_vblank_on call during seamless transition when crtc is already enabled as it is not required. Change-Id: I0b9327a98cef00405b5b94e24a3fd15205339cfc Signed-off-by: Raviteja Tamatam <travitej@codeaurora.org>
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