1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * Copyright (C) 2012-2014, The Linux Foundation. All rights reserved. 4 * 5 * Not a Contribution, Apache license notifications and license are 6 * retained for attribution purposes only. 7 8 * Licensed under the Apache License, Version 2.0 (the "License"); 9 * you may not use this file except in compliance with the License. 10 * You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21#include <cutils/properties.h> 22#include <utils/Log.h> 23#include <fcntl.h> 24#include <sys/ioctl.h> 25#include <linux/msm_mdp.h> 26#include <sys/resource.h> 27#include <sys/prctl.h> 28#include <poll.h> 29#include "hwc_utils.h" 30#include "string.h" 31#include "external.h" 32#include "overlay.h" 33#define __STDC_FORMAT_MACROS 1 34#include <inttypes.h> 35 36namespace qhwc { 37 38#define HWC_VSYNC_THREAD_NAME "hwcVsyncThread" 39#define MAX_SYSFS_FILE_PATH 255 40#define PANEL_ON_STR "panel_power_on =" 41#define ARRAY_LENGTH(array) (sizeof((array))/sizeof((array)[0])) 42const int MAX_DATA = 64; 43 44int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable) 45{ 46 int ret = 0; 47 if(!ctx->vstate.fakevsync && 48 ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL, 49 &enable) < 0) { 50 ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s", 51 __FUNCTION__, dpy, enable, strerror(errno)); 52 ret = -errno; 53 } 54 return ret; 55} 56 57static void handle_vsync_event(hwc_context_t* ctx, int dpy, char *data) 58{ 59 // extract timestamp 60 uint64_t timestamp = 0; 61 if (!strncmp(data, "VSYNC=", strlen("VSYNC="))) { 62 timestamp = strtoull(data + strlen("VSYNC="), NULL, 0); 63 } 64 // send timestamp to SurfaceFlinger 65 ALOGD_IF (ctx->vstate.debug, "%s: timestamp %"PRIu64" sent to SF for dpy=%d", 66 __FUNCTION__, timestamp, dpy); 67 ctx->proc->vsync(ctx->proc, dpy, timestamp); 68} 69 70static void handle_blank_event(hwc_context_t* ctx, int dpy, char *data) 71{ 72 if (!strncmp(data, PANEL_ON_STR, strlen(PANEL_ON_STR))) { 73 unsigned long int poweron = strtoul(data + strlen(PANEL_ON_STR), NULL, 0); 74 ALOGI("%s: dpy:%d panel power state: %ld", __FUNCTION__, dpy, poweron); 75 ctx->dpyAttr[dpy].isActive = poweron ? true: false; 76 } 77} 78 79struct event { 80 const char* name; 81 void (*callback)(hwc_context_t* ctx, int dpy, char *data); 82}; 83 84struct event event_list[] = { 85 { "vsync_event", handle_vsync_event }, 86 { "show_blank_event", handle_blank_event }, 87}; 88 89#define num_events ARRAY_LENGTH(event_list) 90#define VSYNC_FAILURE_THRESHOLD 2 91 92static void *vsync_loop(void *param) 93{ 94 hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param); 95 96 char thread_name[64] = HWC_VSYNC_THREAD_NAME; 97 prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0); 98 setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY + 99 android::PRIORITY_MORE_FAVORABLE); 100 101 char vdata[MAX_DATA]; 102 //Number of physical displays 103 //We poll on all the nodes. 104 int num_displays = HWC_NUM_DISPLAY_TYPES - 1; 105 struct pollfd pfd[num_displays][num_events]; 106 107 char property[PROPERTY_VALUE_MAX]; 108 if(property_get("debug.hwc.fakevsync", property, NULL) > 0) { 109 if(atoi(property) == 1) 110 ctx->vstate.fakevsync = true; 111 } 112 113 char node_path[MAX_SYSFS_FILE_PATH]; 114#ifdef VSYNC_FAILURE_FALLBACK 115 int fake_vsync_switch_cnt = 0; 116#endif 117 118 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { 119 for(size_t ev = 0; ev < num_events; ev++) { 120 snprintf(node_path, sizeof(node_path), 121 "/sys/class/graphics/fb%d/%s", 122 dpy == HWC_DISPLAY_PRIMARY ? 0 : 123 overlay::Overlay::getInstance()-> 124 getFbForDpy(HWC_DISPLAY_EXTERNAL), 125 event_list[ev].name); 126 127 ALOGI("%s: Reading event %zu for dpy %d from %s", __FUNCTION__, 128 ev, dpy, node_path); 129 pfd[dpy][ev].fd = open(node_path, O_RDONLY); 130 131 if (dpy == HWC_DISPLAY_PRIMARY && pfd[dpy][ev].fd < 0) { 132 // Make sure fb device is opened before starting 133 // this thread so this never happens. 134 ALOGE ("%s:unable to open event node for dpy=%d event=%zu, %s", 135 __FUNCTION__, dpy, ev, strerror(errno)); 136 if (ev == 0) { 137 ctx->vstate.fakevsync = true; 138 //XXX: Blank events don't work with fake vsync, 139 //but we shouldn't be running on fake vsync anyway. 140 break; 141 } 142 } 143 144 pread(pfd[dpy][ev].fd, vdata , MAX_DATA, 0); 145 if (pfd[dpy][ev].fd >= 0) 146 pfd[dpy][ev].events = POLLPRI | POLLERR; 147 } 148 } 149 150 if (LIKELY(!ctx->vstate.fakevsync)) { 151 do { 152 int err = poll(*pfd, (int)(num_displays * num_events), -1); 153 if(err > 0) { 154 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { 155 for(size_t ev = 0; ev < num_events; ev++) { 156 if (pfd[dpy][ev].revents & POLLPRI) { 157 ssize_t len = pread(pfd[dpy][ev].fd, vdata, MAX_DATA, 0); 158 if (UNLIKELY(len < 0)) { 159 // If the read was just interrupted - it is not 160 // a fatal error. Just continue in this case 161 ALOGE ("%s: Unable to read event:%zu for \ 162 dpy=%d : %s", 163 __FUNCTION__, ev, dpy, strerror(errno)); 164#ifdef VSYNC_FAILURE_FALLBACK 165 fake_vsync_switch_cnt++; 166 if (fake_vsync_switch_cnt > 167 VSYNC_FAILURE_THRESHOLD) { 168 ALOGE("%s: Too many errors, falling back to fake vsync ", 169 __FUNCTION__); 170 ctx->vstate.fakevsync = true; 171 goto vsync_failed; 172 } 173#endif 174 continue; 175 } 176 event_list[ev].callback(ctx, dpy, vdata); 177 } 178 } 179 } 180 } else { 181 ALOGE("%s: poll failed errno: %s", __FUNCTION__, 182 strerror(errno)); 183 continue; 184 } 185 } while (true); 186 187 } else { 188 189#ifdef VSYNC_FAILURE_FALLBACK 190vsync_failed: 191#endif 192 //Fake vsync is used only when set explicitly through a property or when 193 //the vsync timestamp node cannot be opened at bootup. There is no 194 //fallback to fake vsync from the true vsync loop, ever, as the 195 //condition can easily escape detection. 196 //Also, fake vsync is delivered only for the primary display. 197 do { 198 usleep(16666); 199 uint64_t timestamp = systemTime(); 200 ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY, timestamp); 201 202 } while (true); 203 } 204 205 for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) { 206 for( size_t event = 0; event < num_events; event++) { 207 if(pfd[dpy][event].fd >= 0) 208 close (pfd[dpy][event].fd); 209 } 210 } 211 212 return NULL; 213} 214 215void init_vsync_thread(hwc_context_t* ctx) 216{ 217 int ret; 218 pthread_t vsync_thread; 219 ALOGI("Initializing VSYNC Thread"); 220 ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx); 221 if (ret) { 222 ALOGE("%s: failed to create %s: %s", __FUNCTION__, 223 HWC_VSYNC_THREAD_NAME, strerror(ret)); 224 } 225} 226 227}; //namespace 228