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drm: Add DRM_MODE_PAGE_FLIP_ASYNC flag definition
This requests that the driver perform the page flip as soon as possible, not necessarily waiting for vblank. Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Dave Airlie <airlied@gmail.com>
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@ -412,7 +412,8 @@ struct drm_mode_crtc_lut {
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};
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#define DRM_MODE_PAGE_FLIP_EVENT 0x01
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#define DRM_MODE_PAGE_FLIP_FLAGS DRM_MODE_PAGE_FLIP_EVENT
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#define DRM_MODE_PAGE_FLIP_ASYNC 0x02
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#define DRM_MODE_PAGE_FLIP_FLAGS (DRM_MODE_PAGE_FLIP_EVENT|DRM_MODE_PAGE_FLIP_ASYNC)
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/*
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* Request a page flip on the specified crtc.
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@ -426,11 +427,14 @@ struct drm_mode_crtc_lut {
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* flip is already pending as the ioctl is called, EBUSY will be
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* returned.
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*
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* The ioctl supports one flag, DRM_MODE_PAGE_FLIP_EVENT, which will
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* request that drm sends back a vblank event (see drm.h: struct
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* drm_event_vblank) when the page flip is done. The user_data field
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* passed in with this ioctl will be returned as the user_data field
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* in the vblank event struct.
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* Flag DRM_MODE_PAGE_FLIP_EVENT requests that drm sends back a vblank
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* event (see drm.h: struct drm_event_vblank) when the page flip is
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* done. The user_data field passed in with this ioctl will be
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* returned as the user_data field in the vblank event struct.
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*
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* Flag DRM_MODE_PAGE_FLIP_ASYNC requests that the flip happen
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* 'as soon as possible', meaning that it not delay waiting for vblank.
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* This may cause tearing on the screen.
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*
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* The reserved field must be zero until we figure out something
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* clever to use it for.
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