电源管理状态和亮度改变调用流程

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一、powermanager最终会调用如下线程

frameworks/base/services/core/java/com/android/server/display/LocalDisplayAdapter.java ：

 public Runnable requestDisplayStateLocked(final int state, final int brightness) {
            // Assume that the brightness is off if the display is being turned off.
            assert state != Display.STATE_OFF || brightness == PowerManager.BRIGHTNESS_OFF;

            final boolean stateChanged = (mState != state);
            final boolean brightnessChanged = (mBrightness != brightness) && mBacklight != null;
            if (stateChanged || brightnessChanged) {
                final int displayId = mBuiltInDisplayId;
                final IBinder token = getDisplayTokenLocked();
                final int oldState = mState;

                if (stateChanged) {
                    mState = state;
                    updateDeviceInfoLocked();
                }

                if (brightnessChanged) {
                    mBrightness = brightness;
                }

                // Defer actually setting the display state until after we have exited
                // the critical section since it can take hundreds of milliseconds
                // to complete.
                return new Runnable() {
                    @Override
                    public void run() {
                        // Exit a suspended state before making any changes.
                        int currentState = oldState;
                        if (Display.isSuspendedState(oldState)
                                || oldState == Display.STATE_UNKNOWN) {
                            if (!Display.isSuspendedState(state)) {
                                setDisplayState(state);
                                currentState = state;
                            } else if (state == Display.STATE_DOZE_SUSPEND
                                    || oldState == Display.STATE_DOZE_SUSPEND) {
                                setDisplayState(Display.STATE_DOZE);
                                currentState = Display.STATE_DOZE;
                            } else {
                                return; // old state and new state is off
                            }
                        }

                        // Apply brightness changes given that we are in a non-suspended state.
                        if (brightnessChanged) {
                            setDisplayBrightness(brightness);
                        }

                        // Enter the final desired state, possibly suspended.
                        if (state != currentState) {
                            setDisplayState(state);
                        }
                    }

                    private void setDisplayState(int state) {
                        if (DEBUG) {
                            Slog.d(TAG, "setDisplayState("
                                    + "id=" + displayId
                                    + ", state=" + Display.stateToString(state) + ")");
                        }

                        Trace.traceBegin(Trace.TRACE_TAG_POWER, "setDisplayState("
                                + "id=" + displayId
                                + ", state=" + Display.stateToString(state) + ")");
                        try {
                            final int mode = getPowerModeForState(state);
                            SurfaceControl.setDisplayPowerMode(token, mode);
                        } finally {
                            Trace.traceEnd(Trace.TRACE_TAG_POWER);
                        }
                    }

                    private void setDisplayBrightness(int brightness) {
                        if (DEBUG) {
                            Slog.d(TAG, "setDisplayBrightness("
                                    + "id=" + displayId + ", brightness=" + brightness + ")");
                        }

                        Trace.traceBegin(Trace.TRACE_TAG_POWER, "setDisplayBrightness("
                                + "id=" + displayId + ", brightness=" + brightness + ")");
                        try {
                            mBacklight.setBrightness(brightness);
                        } finally {
                            Trace.traceEnd(Trace.TRACE_TAG_POWER);
                        }
                    }
                };
            }
            return null;
        }

二、mBacklight.setBrightness(brightness);直接调用lightservice中接口

三、电源管理模式的设置

  final int mode = getPowerModeForState(state);
  SurfaceControl.setDisplayPowerMode(token, mode);

1、 getPowerModeForState()

   static int getPowerModeForState(int state) {
        switch (state) {
            case Display.STATE_OFF:
                return SurfaceControl.POWER_MODE_OFF;
            case Display.STATE_DOZE:
                return SurfaceControl.POWER_MODE_DOZE;
            case Display.STATE_DOZE_SUSPEND:
                return SurfaceControl.POWER_MODE_DOZE_SUSPEND;
            default:
                return SurfaceControl.POWER_MODE_NORMAL;
        }
    }

2、SurfaceControl.setDisplayPowerMode(token, mode);

（1）setDisplayPowerMode（）

framework/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);
    }

（2）nativeSetDisplayPowerMode（）

framework/base/core/jni/android_view_SurfaceControl.cpp

static void nativeSetDisplayPowerMode(JNIEnv* env, jclass clazz, jobject tokenObj, jint mode) {
    sp<IBinder> token(ibinderForJavaObject(env, tokenObj));
    if (token == NULL) return;

    ALOGD_IF_SLOW(100, "Excessive delay in setPowerMode()");
    SurfaceComposerClient::setDisplayPowerMode(token, mode);
}

（3）framework/native/libs/gui/SurfaceComposerClient.cpp

void SurfaceComposerClient::setDisplayPowerMode(const sp<IBinder>& token,
        int mode) {
    ComposerService::getComposerService()->setPowerMode(token, mode);
}

（4）setPowerMode()

frameworks/native/services/surfaceflinger/DisplayHardware/HWComposer.cpp

status_t HWComposer::setPowerMode(int disp, int mode) {
    LOG_FATAL_IF(disp >= VIRTUAL_DISPLAY_ID_BASE);
    if (mHwc) {
        if (mode == HWC_POWER_MODE_OFF) {
            eventControl(disp, HWC_EVENT_VSYNC, 0);
        }
        if (hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_4)) {
            return (status_t)mHwc->setPowerMode(mHwc, disp, mode);
        } else {
            return (status_t)mHwc->blank(mHwc, disp,
                    mode == HWC_POWER_MODE_OFF ? 1 : 0);
        }
    }
    return NO_ERROR;
}

接着往下调用HWC中接口，最终调用到驱动中

本文标签： 亮度流程电源状态