f6de1c04ff
SF could end-up in an infinite crash-loop during startup if it was stopped while the screen was off. This happened because the thread that manages screen blanking was started before other important pieces of SF were initialized. Change-Id: I0dded11dbf2395fdd57b673859a7aa0fa9eb32b6
148 lines
4.3 KiB
C++
148 lines
4.3 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <utils/Log.h>
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#include "DisplayHardware/DisplayHardwareBase.h"
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#include "SurfaceFlinger.h"
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// ----------------------------------------------------------------------------
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namespace android {
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static char const * const kSleepFileName = "/sys/power/wait_for_fb_sleep";
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static char const * const kWakeFileName = "/sys/power/wait_for_fb_wake";
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// ----------------------------------------------------------------------------
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DisplayHardwareBase::DisplayEventThread::DisplayEventThread(
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const sp<SurfaceFlinger>& flinger)
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: Thread(false), mFlinger(flinger) {
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}
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DisplayHardwareBase::DisplayEventThread::~DisplayEventThread() {
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}
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status_t DisplayHardwareBase::DisplayEventThread::initCheck() const {
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return ((access(kSleepFileName, R_OK) == 0 &&
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access(kWakeFileName, R_OK) == 0)) ? NO_ERROR : NO_INIT;
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}
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bool DisplayHardwareBase::DisplayEventThread::threadLoop() {
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if (waitForFbSleep() == NO_ERROR) {
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sp<SurfaceFlinger> flinger = mFlinger.promote();
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ALOGD("About to give-up screen, flinger = %p", flinger.get());
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if (flinger != 0) {
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mBarrier.close();
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flinger->screenReleased(0);
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mBarrier.wait();
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}
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if (waitForFbWake() == NO_ERROR) {
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sp<SurfaceFlinger> flinger = mFlinger.promote();
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ALOGD("Screen about to return, flinger = %p", flinger.get());
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if (flinger != 0) {
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flinger->screenAcquired(0);
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}
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return true;
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}
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}
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// error, exit the thread
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return false;
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}
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status_t DisplayHardwareBase::DisplayEventThread::waitForFbSleep() {
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int err = 0;
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char buf;
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int fd = open(kSleepFileName, O_RDONLY, 0);
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// if the file doesn't exist, the error will be caught in read() below
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do {
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err = read(fd, &buf, 1);
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} while (err < 0 && errno == EINTR);
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close(fd);
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ALOGE_IF(err<0, "*** ANDROID_WAIT_FOR_FB_SLEEP failed (%s)", strerror(errno));
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return err < 0 ? -errno : int(NO_ERROR);
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}
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status_t DisplayHardwareBase::DisplayEventThread::waitForFbWake() {
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int err = 0;
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char buf;
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int fd = open(kWakeFileName, O_RDONLY, 0);
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// if the file doesn't exist, the error will be caught in read() below
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do {
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err = read(fd, &buf, 1);
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} while (err < 0 && errno == EINTR);
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close(fd);
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ALOGE_IF(err<0, "*** ANDROID_WAIT_FOR_FB_WAKE failed (%s)", strerror(errno));
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return err < 0 ? -errno : int(NO_ERROR);
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}
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status_t DisplayHardwareBase::DisplayEventThread::releaseScreen() const {
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mBarrier.open();
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return NO_ERROR;
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}
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// ----------------------------------------------------------------------------
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DisplayHardwareBase::DisplayHardwareBase(const sp<SurfaceFlinger>& flinger,
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uint32_t displayIndex)
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: mScreenAcquired(true)
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{
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mDisplayEventThread = new DisplayEventThread(flinger);
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}
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void DisplayHardwareBase::startSleepManagement() const {
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if (mDisplayEventThread->initCheck() == NO_ERROR) {
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mDisplayEventThread->run("DisplayEventThread", PRIORITY_URGENT_DISPLAY);
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} else {
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ALOGW("/sys/power/wait_for_fb_{wake|sleep} don't exist");
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}
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}
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DisplayHardwareBase::~DisplayHardwareBase() {
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// request exit
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mDisplayEventThread->requestExitAndWait();
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}
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bool DisplayHardwareBase::canDraw() const {
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return mScreenAcquired;
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}
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void DisplayHardwareBase::releaseScreen() const {
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status_t err = mDisplayEventThread->releaseScreen();
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if (err >= 0) {
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mScreenAcquired = false;
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}
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}
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void DisplayHardwareBase::acquireScreen() const {
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mScreenAcquired = true;
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}
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bool DisplayHardwareBase::isScreenAcquired() const {
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return mScreenAcquired;
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}
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}; // namespace android
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