ADHOC/replicant-frameworks_native
3
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

SurfaceFlinger: disable VSync thread if no clients requiring.

Browse Source 
In EventThread, 2 VSYNCs are needed to do composition and update
the client status. So, a 30FPS video may leads to 60FPS VSYNC,
which means the DispSync thread would be waked 60FPS. This is a
unexpected behavior which takes more power consumption. Now we
update the SF status soon after the first VSYNC, which means no
extra VSYNC needed, and the DispSync could be awaked as expected,
and consequently power get saved.

Change-Id: If486eb9b87f109a71f71b510768f15dd733f1233
Orig-Change-Id: I1d3b166021e15a81b2ad770b039761fc2c15fddf
Tracked-On: https://jira01.devtools.intel.com/browse/IMINAN-12211
Category: aosp improvement
Domain: Graphics-SF
Origin: internal
Upstream-Candidate: yes
Signed-off-by: Wang, Yue A <yue.a.wang@intel.com>
Reviewed-on: https://android.intel.com:443/238344
This commit is contained in:
Wang, Yue A 2014-01-21 17:42:13 +08:00 committed by Wolfgang Wiedmeyer
parent d3ad4f1e64
commit c159da765b
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
services/surfaceflinger/EventThread.cpp
View File

@ -283,11 +283,11 @@ Vector< sp<EventThread::Connection> > EventThread::waitForEvent(
} }
// Here we figure out if we need to enable or disable vsyncs // Here we figure out if we need to enable or disable vsyncs
if (timestamp && !waitForVSync) { if (!waitForVSync) {
// we received a VSYNC but we have no clients // we have no clients waiting on next VSYNC
// don't report it, and disable VSYNC events // just disable VSYNC events.
disableVSyncLocked(); disableVSyncLocked();
} else if (!timestamp && waitForVSync) { } else if (!timestamp) {
// we have at least one client, so we want vsync enabled // we have at least one client, so we want vsync enabled
// (TODO: this function is called right after we finish // (TODO: this function is called right after we finish
// notifying clients of a vsync, so this call will be made // notifying clients of a vsync, so this call will be made