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am 8e26b28b: Filter out vsync events from HWC with duplicate timestamps

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* commit '8e26b28be62e7c0e093900540db5e5cdcf52a0ff':
  Filter out vsync events from HWC with duplicate timestamps
This commit is contained in:
Jesse Hall 2013-10-14 20:34:58 -07:00 committed by Android Git Automerger
commit a04fd39cb8
1 changed files with 16 additions and 2 deletions
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18
services/surfaceflinger/DisplayHardware/HWComposer.cpp
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@ -284,13 +284,27 @@ void HWComposer::invalidate() {
void HWComposer::vsync(int disp, int64_t timestamp) {
if (uint32_t(disp) < HWC_NUM_PHYSICAL_DISPLAY_TYPES) {
{
Mutex::Autolock _l(mLock);
// There have been reports of HWCs that signal several vsync events
// with the same timestamp when turning the display off and on. This
// is a bug in the HWC implementation, but filter the extra events
// out here so they don't cause havoc downstream.
if (timestamp == mLastHwVSync[disp]) {
ALOGW("Ignoring duplicate VSYNC event from HWC (t=%lld)",
timestamp);
return;
}
mLastHwVSync[disp] = timestamp;
}
char tag[16];
snprintf(tag, sizeof(tag), "HW_VSYNC_%1u", disp);
ATRACE_INT(tag, ++mVSyncCounts[disp] & 1);
mEventHandler.onVSyncReceived(disp, timestamp);
Mutex::Autolock _l(mLock);
mLastHwVSync[disp] = timestamp;
}
}