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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>
This commit is contained in:
Keith Packard 2013-07-22 18:49:59 -07:00 committed by Dave Airlie
parent ed8d19756e
commit 9bba0c42ec
1 changed files with 10 additions and 6 deletions
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16
include/uapi/drm/drm_mode.h
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@ -412,7 +412,8 @@ struct drm_mode_crtc_lut {
};
#define DRM_MODE_PAGE_FLIP_EVENT 0x01
#define DRM_MODE_PAGE_FLIP_FLAGS DRM_MODE_PAGE_FLIP_EVENT
#define DRM_MODE_PAGE_FLIP_ASYNC 0x02
#define DRM_MODE_PAGE_FLIP_FLAGS (DRM_MODE_PAGE_FLIP_EVENT|DRM_MODE_PAGE_FLIP_ASYNC)
/*
* Request a page flip on the specified crtc.
@ -426,11 +427,14 @@ struct drm_mode_crtc_lut {
* flip is already pending as the ioctl is called, EBUSY will be
* returned.
*
* The ioctl supports one flag, DRM_MODE_PAGE_FLIP_EVENT, which will
* request that drm sends back a vblank event (see drm.h: struct
* drm_event_vblank) when the page flip is done. The user_data field
* passed in with this ioctl will be returned as the user_data field
* in the vblank event struct.
* Flag DRM_MODE_PAGE_FLIP_EVENT requests that drm sends back a vblank
* event (see drm.h: struct drm_event_vblank) when the page flip is
* done. The user_data field passed in with this ioctl will be
* returned as the user_data field in the vblank event struct.
*
* Flag DRM_MODE_PAGE_FLIP_ASYNC requests that the flip happen
* 'as soon as possible', meaning that it not delay waiting for vblank.
* This may cause tearing on the screen.
*
* The reserved field must be zero until we figure out something
* clever to use it for.