linux-kernel - [PATCH 2/5] drm: Add DRM_MODE_PAGE_FLIP

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Message-Id: <1374544202-15496-3-git-send-email-keithp@keithp.com>
Date:	Mon, 22 Jul 2013 18:49:59 -0700
From:	Keith Packard <keithp@...thp.com>
To:	linux-kernel@...r.kernel.org, Dave Airlie <airlied@...hat.com>
Cc:	Keith Packard <keithp@...thp.com>, dri-devel@...ts.freedesktop.org
Subject: [PATCH 2/5] 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@...thp.com>
---
 include/uapi/drm/drm_mode.h | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 53db7ce..5508117 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -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.
-- 
1.8.3.2

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