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drm: Add DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags v2

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These flags allow userspace to explicitly specify the target vertical
blank period when a flip should take effect.

v2:
* Add new struct drm_mode_crtc_page_flip_target instead of modifying
  struct drm_mode_crtc_page_flip, to make sure all existing userspace
  code keeps compiling (Daniel Vetter)

Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michel Dänzer
2016-08-08 16:23:39 +09:00
committed by Alex Deucher
parent 5dd20bbae8
commit f837297ad8
4 changed files with 86 additions and 10 deletions
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39
include/uapi/drm/drm_mode.h
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@@ -520,7 +520,13 @@ struct drm_color_lut {
#define DRM_MODE_PAGE_FLIP_EVENT 0x01
#define DRM_MODE_PAGE_FLIP_ASYNC 0x02
#define DRM_MODE_PAGE_FLIP_FLAGS (DRM_MODE_PAGE_FLIP_EVENT|DRM_MODE_PAGE_FLIP_ASYNC)
#define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4
#define DRM_MODE_PAGE_FLIP_TARGET_RELATIVE 0x8
#define DRM_MODE_PAGE_FLIP_TARGET (DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE | \
DRM_MODE_PAGE_FLIP_TARGET_RELATIVE)
#define DRM_MODE_PAGE_FLIP_FLAGS (DRM_MODE_PAGE_FLIP_EVENT | \
DRM_MODE_PAGE_FLIP_ASYNC | \
DRM_MODE_PAGE_FLIP_TARGET)
/*
* Request a page flip on the specified crtc.
@@ -543,8 +549,7 @@ struct drm_color_lut {
* '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.
* The reserved field must be zero.
*/
struct drm_mode_crtc_page_flip {
@@ -555,6 +560,34 @@ struct drm_mode_crtc_page_flip {
__u64 user_data;
};
/*
* Request a page flip on the specified crtc.
*
* Same as struct drm_mode_crtc_page_flip, but supports new flags and
* re-purposes the reserved field:
*
* The sequence field must be zero unless either of the
* DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags is specified. When
* the ABSOLUTE flag is specified, the sequence field denotes the absolute
* vblank sequence when the flip should take effect. When the RELATIVE
* flag is specified, the sequence field denotes the relative (to the
* current one when the ioctl is called) vblank sequence when the flip
* should take effect. NOTE: DRM_IOCTL_WAIT_VBLANK must still be used to
* make sure the vblank sequence before the target one has passed before
* calling this ioctl. The purpose of the
* DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE/RELATIVE flags is merely to clarify
* the target for when code dealing with a page flip runs during a
* vertical blank period.
*/
struct drm_mode_crtc_page_flip_target {
__u32 crtc_id;
__u32 fb_id;
__u32 flags;
__u32 sequence;
__u64 user_data;
};
/* create a dumb scanout buffer */
struct drm_mode_create_dumb {
__u32 height;