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Disable hardware vsync when blanking the screen

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Bug: 11220224
Change-Id: I99d0a42e1a6bb0aaf89706f6d100e9ef2a5deaa4
This commit is contained in:
Jesse Hall 2013-10-14 12:56:09 -07:00
parent 8e26b28be6
commit 948fe0ce74
2 changed files with 22 additions and 8 deletions
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25
services/surfaceflinger/SurfaceFlinger.cpp
View File

@ -147,6 +147,7 @@ SurfaceFlinger::SurfaceFlinger()
mLastTransactionTime(0),
mBootFinished(false),
mPrimaryHWVsyncEnabled(false),
mHWVsyncAvailable(false),
mDaltonize(false)
{
ALOGI("SurfaceFlinger is starting");
@ -752,16 +753,23 @@ void SurfaceFlinger::run() {
void SurfaceFlinger::enableHardwareVsync() {
Mutex::Autolock _l(mHWVsyncLock);
if (!mPrimaryHWVsyncEnabled) {
if (!mPrimaryHWVsyncEnabled && mHWVsyncAvailable) {
mPrimaryDispSync.beginResync();
eventControl(HWC_DISPLAY_PRIMARY, SurfaceFlinger::EVENT_VSYNC, true);
mPrimaryHWVsyncEnabled = true;
}
}
void SurfaceFlinger::resyncToHardwareVsync() {
void SurfaceFlinger::resyncToHardwareVsync(bool makeAvailable) {
Mutex::Autolock _l(mHWVsyncLock);
if (makeAvailable) {
mHWVsyncAvailable = true;
} else if (!mHWVsyncAvailable) {
ALOGE("resyncToHardwareVsync called when HW vsync unavailable");
return;
}
const nsecs_t period =
getHwComposer().getRefreshPeriod(HWC_DISPLAY_PRIMARY);
@ -775,13 +783,16 @@ void SurfaceFlinger::resyncToHardwareVsync() {
}
}
void SurfaceFlinger::disableHardwareVsync() {
void SurfaceFlinger::disableHardwareVsync(bool makeUnavailable) {
Mutex::Autolock _l(mHWVsyncLock);
if (mPrimaryHWVsyncEnabled) {
eventControl(HWC_DISPLAY_PRIMARY, SurfaceFlinger::EVENT_VSYNC, false);
mPrimaryDispSync.endResync();
mPrimaryHWVsyncEnabled = false;
}
if (makeUnavailable) {
mHWVsyncAvailable = false;
}
}
void SurfaceFlinger::onVSyncReceived(int type, nsecs_t timestamp) {
@ -791,7 +802,7 @@ void SurfaceFlinger::onVSyncReceived(int type, nsecs_t timestamp) {
if (needsHwVsync) {
enableHardwareVsync();
} else {
disableHardwareVsync();
disableHardwareVsync(false);
}
}
}
@ -933,7 +944,7 @@ void SurfaceFlinger::postComposition()
if (mPrimaryDispSync.addPresentFence(presentFence)) {
enableHardwareVsync();
} else {
disableHardwareVsync();
disableHardwareVsync(false);
}
}
@ -2178,7 +2189,7 @@ void SurfaceFlinger::onScreenAcquired(const sp<const DisplayDevice>& hw) {
// FIXME: eventthread only knows about the main display right now
mEventThread->onScreenAcquired();
resyncToHardwareVsync();
resyncToHardwareVsync(true);
}
}
mVisibleRegionsDirty = true;
@ -2196,6 +2207,8 @@ void SurfaceFlinger::onScreenReleased(const sp<const DisplayDevice>& hw) {
int32_t type = hw->getDisplayType();
if (type < DisplayDevice::NUM_BUILTIN_DISPLAY_TYPES) {
if (type == DisplayDevice::DISPLAY_PRIMARY) {
disableHardwareVsync(true); // also cancels any in-progress resync
// FIXME: eventthread only knows about the main display right now
mEventThread->onScreenReleased();
}

5
services/surfaceflinger/SurfaceFlinger.h
View File

@ -383,8 +383,8 @@ private:
* VSync
*/
void enableHardwareVsync();
void disableHardwareVsync();
void resyncToHardwareVsync();
void disableHardwareVsync(bool makeUnavailable);
void resyncToHardwareVsync(bool makeAvailable);
/* ------------------------------------------------------------------------
* Debugging & dumpsys
@ -467,6 +467,7 @@ private:
// protected by mHWVsyncLock
Mutex mHWVsyncLock;
bool mPrimaryHWVsyncEnabled;
bool mHWVsyncAvailable;
/* ------------------------------------------------------------------------
* Feature prototyping