commit 1ef881ceed7b39b4034adba23368c2006bfd074c
author Omprakash Dhyade <odhyade@codeaurora.org> Wed Oct 03 02:26:55 2012 -0700
committer Iliyan Malchev <malchev@google.com> Wed Oct 03 10:29:12 2012 -0700
tree 85b261821aac15af1e227879078a700f7d88fb5c
parent c4d034f4b8d12953632907d30c0b78856d829579

don't call vsync-ctrl ioctl for same enable value

Bug: 7274951
Change-Id: Ib21f1ddd623b36a20f195483236ba6cd4bc87c8d
Signed-off-by: Iliyan Malchev <malchev@google.com>

libhwcomposer/hwc.cpp

diff --git a/libhwcomposer/hwc.cpp b/libhwcomposer/hwc.cpp
index c72d882..c4431b6 100644
--- a/libhwcomposer/hwc.cpp
+++ b/libhwcomposer/hwc.cpp
@@ -172,6 +172,8 @@
                 ctx->mFbDev->common.module);
     switch(event) {
         case HWC_EVENT_VSYNC:
+            if (ctx->vstate.enable == enabled)
+                break;
             if(ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL,
                      &enabled) < 0) {
                 ALOGE("%s: vsync control failed. Dpy=%d, enabled=%d : %s",