1 /*
2 * Copyright 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #undef LOG_TAG
18 #define LOG_TAG "PowerAdvisor"
19
20 #include <cinttypes>
21
22 #include <utils/Log.h>
23 #include <utils/Mutex.h>
24
25 #include "PowerAdvisor.h"
26
27 namespace android {
28 namespace Hwc2 {
29
30 PowerAdvisor::~PowerAdvisor() = default;
31
32 namespace impl {
33
34 namespace V1_0 = android::hardware::power::V1_0;
35 using V1_3::PowerHint;
36
37 PowerAdvisor::~PowerAdvisor() = default;
38
39 PowerAdvisor::PowerAdvisor() = default;
40
setExpensiveRenderingExpected(DisplayId displayId,bool expected)41 void PowerAdvisor::setExpensiveRenderingExpected(DisplayId displayId, bool expected) {
42 if (expected) {
43 mExpensiveDisplays.insert(displayId);
44 } else {
45 mExpensiveDisplays.erase(displayId);
46 }
47
48 const bool expectsExpensiveRendering = !mExpensiveDisplays.empty();
49 if (mNotifiedExpensiveRendering != expectsExpensiveRendering) {
50 const sp<V1_3::IPower> powerHal = getPowerHal();
51 if (powerHal == nullptr) {
52 return;
53 }
54 auto ret = powerHal->powerHintAsync_1_3(PowerHint::EXPENSIVE_RENDERING,
55 expectsExpensiveRendering);
56 // If Power HAL 1.3 was available previously but now fails,
57 // it may restart, so attempt to reconnect next time
58 if (!ret.isOk()) {
59 mReconnectPowerHal = true;
60 return;
61 }
62 mNotifiedExpensiveRendering = expectsExpensiveRendering;
63 }
64 }
65
getPowerHal()66 sp<V1_3::IPower> PowerAdvisor::getPowerHal() {
67 static sp<V1_3::IPower> sPowerHal_1_3 = nullptr;
68 static bool sHasPowerHal_1_3 = true;
69
70 if (mReconnectPowerHal) {
71 sPowerHal_1_3 = nullptr;
72 mReconnectPowerHal = false;
73 }
74
75 // Power HAL 1.3 is not guaranteed to be available, thus we need to query
76 // Power HAL 1.0 first and try to cast it to Power HAL 1.3.
77 // Power HAL 1.0 is always available, thus if we fail to query it, it means
78 // Power HAL is not available temporarily and we should retry later. However,
79 // if Power HAL 1.0 is available and we can't cast it to Power HAL 1.3,
80 // it means Power HAL 1.3 is not available at all, so we should stop trying.
81 if (sHasPowerHal_1_3 && sPowerHal_1_3 == nullptr) {
82 sp<V1_0::IPower> powerHal_1_0 = V1_0::IPower::getService();
83 if (powerHal_1_0 != nullptr) {
84 // Try to cast to Power HAL 1.3
85 sPowerHal_1_3 = V1_3::IPower::castFrom(powerHal_1_0);
86 if (sPowerHal_1_3 == nullptr) {
87 ALOGW("No Power HAL 1.3 service in system");
88 sHasPowerHal_1_3 = false;
89 } else {
90 ALOGI("Loaded Power HAL 1.3 service");
91 }
92 }
93 }
94 return sPowerHal_1_3;
95 }
96
97 } // namespace impl
98 } // namespace Hwc2
99 } // namespace android
100