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View File U_03-present-Support-async-flips.patch of Package xf86-video-ati (Project home:lbssousa:leap42.1-backports)

From: Michel Dänzer <michel.daenzer@amd.com>
Date: Tue Mar 15 16:47:35 2016 +0900
Subject: [PATCH 3/20]present: Support async flips
Patch-mainline: Upstream
Git-repo: git://anongit.freedesktop.org/xorg/driver/xf86-video-ati
Git-commit: 1ca677309720e2f6c953c9e76f5b34c22a4416c6
References: bsc#990066
Signed-off-by: Max Staudt <mstaudt@suse.de>

The xserver Present code only calls radeon_present_flip with
sync_flip=FALSE if radeon_present_screen_init sets
PresentCapabilityAsync, and the latter only sets it if the kernel driver
advertises support for async flips.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
 src/radeon_present.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/radeon_present.c b/src/radeon_present.c
index 1a0e06a..69a0532 100644
--- a/src/radeon_present.c
+++ b/src/radeon_present.c
@@ -248,9 +248,6 @@ radeon_present_check_flip(RRCrtcPtr crtc, WindowPtr window, PixmapPtr pixmap,
     if (info->hwcursor_disabled)
 	return FALSE;

-    if (!sync_flip)
-	return FALSE;
     if (info->drmmode.dri2_flipping)
 	return FALSE;

@@ -339,7 +336,7 @@ radeon_present_flip(RRCrtcPtr crtc, uint64_t event_id, uint64_t target_msc,
 			     event_id, event, crtc_id,
-			     FLIP_VSYNC);
+			     sync_flip ? FLIP_VSYNC : FLIP_ASYNC);
     if (!ret)
 	xf86DrvMsg(scrn->scrnIndex, X_ERROR, "present flip failed\n");