【android睡眠喚醒 二】MTK平臺喚醒框架分解
在文章MTK 喚醒時間分析中分析了核心中的主要的亮屏重要階段,此篇文章結合上層的log一起來分析下整個系統的亮屏流程。整個流程可以分為如下幾個部分:
(1)power鍵(home鍵)產生並上報(在input子系統中已經介紹);
(2)上層接收到到鍵值,PowerManagerService執行相關處理;
(3)PMS更新全域性電源狀態,並開始喚醒螢幕和背光,並通知各個模組(如圖形繪製Keyguard);
(4)呼叫surfaceflinger開始執行螢幕的和背光的操作;
(5)呼叫到驅動中的late_resume(在MTK 喚醒時間分析
一、PMS接收鍵值過程及更新全域性狀態:
當PowerMangerService接收到power鍵值後,會打印出呼叫的堆疊資訊如下:
01-01 20:08:44.042224 981 1162 D PowerManagerService: |----com.android.server.power.PowerManagerService.wakeUpNoUpdateLocked(PowerManagerService.java:1750) 01-01 20:08:44.042242 981 995 D NetworkPolicy: no need to update restrict data rules for uid 1000 01-01 20:08:44.042271 981 1162 D PowerManagerService: |----com.android.server.power.PowerManagerService.wakeUpInternal(PowerManagerService.java:1741) 01-01 20:08:44.042282 981 995 D NetworkPolicy: no need to update restrict power rules for uid 1000 01-01 20:08:44.042374 981 1162 D PowerManagerService: |----com.android.server.power.PowerManagerService.-wrap43(PowerManagerService.java) 01-01 20:08:44.042415 981 1162 D PowerManagerService: |----com.android.server.power.PowerManagerService$BinderService.wakeUp(PowerManagerService.java:4261) 01-01 20:08:44.042458 981 1162 D PowerManagerService: |----android.os.PowerManager.wakeUp(PowerManager.java:769) 01-01 20:08:44.042505 981 1162 D PowerManagerService: |----com.android.server.policy.PhoneWindowManager.wakeUp(PhoneWindowManager.java:7421) 01-01 20:08:44.042548 981 1162 D PowerManagerService: |----com.android.server.policy.PhoneWindowManager.interceptKeyBeforeQueueing(PhoneWindowManager.java:6874) 01-01 20:08:44.042579 981 1162 D PowerManagerService: |----com.android.server.wm.InputMonitor.interceptKeyBeforeQueueing(InputMonitor.java:465) 01-01 20:08:44.042609 981 1162 D PowerManagerService: |----com.android.server.input.InputManagerService.interceptKeyBeforeQueueing(InputManagerService.java:1897)
從上面的log中可以清晰的看到鍵值被InputManagerService.java的interceptKeyBeforeQueueing方法接收到:
private WindowManagerCallbacks mWindowManagerCallbacks; private int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) { return mWindowManagerCallbacks.interceptKeyBeforeQueueing(event, policyFlags); }
interceptKeyBeforeQueueing會呼叫到PhoneManagerService(PhoneWindowManager.java)中相同的方法如下:
public int interceptKeyBeforeQueueing(KeyEvent event, int policyFlags) {
case KeyEvent.KEYCODE_VOLUME_DOWN:
case KeyEvent.KEYCODE_VOLUME_UP:
...//一些列的鍵值判斷處理
case KeyEvent.KEYCODE_POWER: {
result &= ~ACTION_PASS_TO_USER;
isWakeKey = false; // wake-up will be handled separately
if (down) {
if(!isKeysTest()){
interceptPowerKeyDown(event, interactive);
}else{
sendKey(KeyEvent.KEYCODE_POWER);
}
}
break;
}
......
case KeyEvent.KEYCODE_WAKEUP: {
result &= ~ACTION_PASS_TO_USER;
isWakeKey = true;
break;
}
if (isWakeKey) {
wakeUp(event.getEventTime(), mAllowTheaterModeWakeFromKey, "android.policy:KEY");
}
return result;
}
private boolean wakeUp(long wakeTime, boolean wakeInTheaterMode, String reason) {
final boolean theaterModeEnabled = isTheaterModeEnabled();
if (!wakeInTheaterMode && theaterModeEnabled) {
return false;
}
if (theaterModeEnabled) {
Settings.Global.putInt(mContext.getContentResolver(),
Settings.Global.THEATER_MODE_ON, 0);
}
mPowerManager.wakeUp(wakeTime, reason);
return true;
}
上面程式碼經過一些列的鍵值判斷後,最終會呼叫到wakeup程式碼如下:
private boolean wakeUp(long wakeTime, boolean wakeInTheaterMode, String reason) {
final boolean theaterModeEnabled = isTheaterModeEnabled();
if (!wakeInTheaterMode && theaterModeEnabled) {
return false;
}
if (theaterModeEnabled) {
Settings.Global.putInt(mContext.getContentResolver(),
Settings.Global.THEATER_MODE_ON, 0);
}
mPowerManager.wakeUp(wakeTime, reason);
return true;
}
PowerManager.java中的wakeUp比較簡單:
public void wakeUp(long time, String reason) {
try {
mService.wakeUp(time, reason, mContext.getOpPackageName());
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
最終會呼叫到PowerManagerService中的wakeUp做真正的喚醒工作:
public void wakeUp(long eventTime, String reason, String opPackageName) {
if (eventTime > SystemClock.uptimeMillis()) {
throw new IllegalArgumentException("event time must not be in the future");
}
try {
wakeUpInternal(eventTime, reason, uid, opPackageName, uid);
} finally {
Binder.restoreCallingIdentity(ident);
}
}
private void wakeUpInternal(long eventTime, String reason, int uid, String opPackageName,
int opUid) {
synchronized (mLock) {
if (mIPOShutdown && reason != PowerManager.WAKE_UP_REASON_SHUTDOWN)
return;
if (wakeUpNoUpdateLocked(eventTime, reason, uid, opPackageName, opUid)) {
updatePowerStateLocked();//更新電源狀態
}
}
}
onWakefulnessChangeStarted中會呼叫notify的onWakefulnessChangeStarted傳送亮屏廣播,通知亮屏。
private boolean wakeUpNoUpdateLocked(long eventTime, String reason, int reasonUid,
String opPackageName, int opUid) {
Trace.traceBegin(Trace.TRACE_TAG_POWER, "wakeUp");
try {
......
switch (mWakefulness) {
case WAKEFULNESS_ASLEEP:
Slog.i(TAG, "Waking up from sleep (uid " + reasonUid +")...");
break;
case WAKEFULNESS_DREAMING:
Slog.i(TAG, "Waking up from dream (uid " + reasonUid +")...");
break;
case WAKEFULNESS_DOZING:
Slog.i(TAG, "Waking up from dozing (uid " + reasonUid +")...");
break;
}
mLastWakeTime = eventTime;
setWakefulnessLocked(WAKEFULNESS_AWAKE, 0);
.....
}
private void setWakefulnessLocked(int wakefulness, int reason) {
if (mWakefulness != wakefulness) {
mWakefulness = wakefulness;
mWakefulnessChanging = true;
mDirty |= DIRTY_WAKEFULNESS;
mNotifier.onWakefulnessChangeStarted(wakefulness, reason);//呼叫到notify中
}
}
在Notifier.java中與AMS,window,input進行互動,通知各模組手機狀態發生了改變,根據螢幕狀態各自進行處理, 最後傳送亮滅屏廣播, 通知關心的模組,Notify.java中的onWakefulnessChangeStarted方法列舉一些重要的內容如下:
public void onWakefulnessChangeStarted(final int wakefulness, int reason) {
......
mActivityManagerInternal.onWakefulnessChanged(wakefulness); //與AMS互動處理
mBatteryStats.noteInteractive(interactive);//喚醒battery狀態
handleEarlyInteractiveChange(); //處理前期互動模式改變 ,如鎖屏 Keyguard等
......
}
當上述各個模組初始化完成後會重新呼叫到wakeUpInternal中的updatePowerStateLocked更新全域性電源狀態,並開始執行DisplayPowerController.java中的方法。
private void updatePowerState() {
int state;
......
int brightness = PowerManager.BRIGHTNESS_DEFAULT;
// Apply the proximity sensor.
if (mProximitySensor != null) {
//獲取psensor的狀態
}
if (mScreenOffBecauseOfProximity) {
state = Display.STATE_OFF;
}
//獲取自動背光的狀態值後,呼叫animateScreenBrightness開始執行背光操作
animateScreenBrightness(brightness,
slowChange ? mBrightnessRampRateSlow : mBrightnessRampRateFast);
//判斷亮屏前是否有未完成的任務,如圖形是否繪製成功等
// Grab a wake lock if we have unfinished business.
if (!finished && !mUnfinishedBusiness) {
if (DEBUG) {
Slog.d(TAG, "Unfinished business...");
}
mCallbacks.acquireSuspendBlocker();
mUnfinishedBusiness = true;
}
// Release the wake lock when we have no unfinished business.
if (finished && mUnfinishedBusiness) {
if (DEBUG) {
Slog.d(TAG, "Finished business...");
}
mUnfinishedBusiness = false;
mCallbacks.releaseSuspendBlocker();
}
// Record if dozing for future comparison.
mDozing = state != Display.STATE_ON;
}
updatePowerState()中有很多的操作,上面的程式碼只列舉了部分重要階段的程式碼,上面的任務完成後,下面會呼叫到LocalDisplayAdapter.java真正的開始亮屏和亮背光的操作。
LocalDisplayAdapter.java
public Runnable requestDisplayStateLocked(final int state, final int brightness)
private void setDisplayState(int state)
blockScreenOn會等待windws繪製完成,unblockScreenOn
private void setDisplayBrightness(int brightness)
SurfaceControl.setDisplayPowerMode呼叫到surfacefligner的setPowerMode
二、surfaceflinger亮屏和亮背光
在LocalDisplayAdapter中會通過相應的介面呼叫到surfacefligner的操作:
//frameworks/base/core/java/android/view/SurfaceControl.java
public static void setDisplayPowerMode(IBinder displayToken, int mode) {
if (displayToken == null) {
throw new IllegalArgumentException("displayToken must not be null");
}
nativeSetDisplayPowerMode(displayToken, mode);
}
這樣又呼叫到native層的介面:
//frameworks/native/services/surfaceflinger/SurfaceFlinger.cpp
void SurfaceFlinger::setPowerModeInternal(const sp<DisplayDevice>& hw,
int mode, bool stateLockHeld) {
ALOGD("Set power mode=%d, type=%d flinger=%p", mode, hw->getDisplayType(),
this);
int32_t type = hw->getDisplayType();
int currentMode = hw->getPowerMode();
hw->setPowerMode(mode);
if (type >= DisplayDevice::NUM_BUILTIN_DISPLAY_TYPES) {
ALOGW("Trying to set power mode for virtual display");
return;
}
//...這裡做了很多工作,上面只列舉了setPowerMode的部分
}
void HWCDisplay::setPowerMode(const int32_t& mode)
{
// screen blanking based on early_suspend in the kernel
HWC_LOGI("Display(%" PRId64 ") SetPowerMode(%d)", m_disp_id, mode);
m_power_mode = mode;
DisplayManager::getInstance().setDisplayPowerState(m_disp_id, mode);
HWCDispatcher::getInstance().setPowerMode(m_disp_id, mode);
DisplayManager::getInstance().setPowerMode(m_disp_id, mode);
......
}
這一塊的程式碼都會被編譯到hwcomposer.<platform>.so庫中,之前部分平臺此部分程式碼不開源,當前新的一些平臺,這部分的程式碼已經開源,所以可以看到上面部分的程式碼,下面才是真正完成setPowerMode工作的函式體:
void DispDevice::setPowerMode(int dpy,int mode)
{
if (HWCMediator::getInstance().m_features.control_fb)
{
HWC_LOGD("DispDevice::setPowerMode() dpy:%d mode:%d", dpy, mode);
char filename[32] = {0};
//開啟/dev/graphics/fb%d的節點進行ioctl的操作
snprintf(filename, sizeof(filename), "/dev/graphics/fb%d", dpy);
int fb_fd = open(filename, O_RDWR);
if (fb_fd <= 0)
{
HWC_LOGE("Failed to open fb%d device: %s", dpy, strerror(errno));
return;
}
switch (mode)
{
case HWC_POWER_MODE_OFF://滅屏
{
err = WDT_IOCTL(fb_fd, FBIOBLANK, FB_BLANK_POWERDOWN);
break;
}
case HWC_POWER_MODE_NORMAL://亮屏
{
err = WDT_IOCTL(fb_fd, FBIOBLANK, FB_BLANK_UNBLANK);
m_color_transform_info[dpy].resend_color_transform = true;
break;
}
case HWC_POWER_MODE_DOZE:
case HWC_POWER_MODE_DOZE_SUSPEND:
{
......
}
protectedClose(fb_fd);
}
}
三、kernel resume work:
上面setPowerMode會直接通過fb0-x的節點呼叫到kernel的程式碼中:
//kernel-3.18/drivers/misc/mediatek/video/common/mtkfb.c
static struct fb_ops mtkfb_ops = {
.owner = THIS_MODULE,
.fb_ioctl = mtkfb_ioctl,
#ifdef CONFIG_COMPAT
.fb_compat_ioctl = mtkfb_compat_ioctl,
#endif
#if defined(CONFIG_PM_AUTOSLEEP)
.fb_blank = mtkfb_blank,
#endif
}
static int mtkfb_blank(int blank_mode, struct fb_info *info)
{
enum mtkfb_power_mode prev_pm = primary_display_get_power_mode();
switch (blank_mode) {
case FB_BLANK_UNBLANK:
case FB_BLANK_NORMAL:
DISPDBG("mtkfb_blank mtkfb_late_resume\n");
if (bypass_blank) {
DISPERR("FB_BLANK_UNBLANK bypass_blank %d\n", bypass_blank);
break;
}
primary_display_set_power_mode(FB_RESUME);
mtkfb_late_resume();//正式進入到late_resume相關屏的操作
debug_print_power_mode_check(prev_pm, FB_RESUME);
if (!lcd_fps)
msleep(30);
else
msleep(2 * 100000 / lcd_fps); /* Delay 2 frames. */
break;
上面的流程MTK 喚醒時間分析一文中已經介紹。
到這裡,整個流程就已經徹底貫通,流程圖如下:
kernel部分的喚醒流程如下:
作者:frank_zyp
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