/* * Copyright (C) 2010 The Android Open Source Project * Copyright (C) 2012-2014, The Linux Foundation. All rights reserved. * * Not a Contribution, Apache license notifications and license are * retained for attribution purposes only. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #include "hwc_utils.h" #include "string.h" #include "external.h" #include "overlay.h" #include namespace qhwc { #define HWC_VSYNC_THREAD_NAME "hwcVsyncThread" #define MAX_SYSFS_FILE_PATH 255 #define PANEL_ON_STR "panel_power_on =" #define ARRAY_LENGTH(array) (sizeof((array))/sizeof((array)[0])) const int MAX_DATA = 64; int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable) { int ret = 0; if(!ctx->vstate.fakevsync && ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL, &enable) < 0) { ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s", __FUNCTION__, dpy, enable, strerror(errno)); ret = -errno; } return ret; } static void handle_vsync_event(hwc_context_t* ctx, int dpy, char *data) { // extract timestamp uint64_t timestamp = 0; if (!strncmp(data, "VSYNC=", strlen("VSYNC="))) { timestamp = strtoull(data + strlen("VSYNC="), NULL, 0); } // send timestamp to SurfaceFlinger ALOGD_IF (ctx->vstate.debug, "%s: timestamp %" PRIu64 " sent to SF for dpy=%d", __FUNCTION__, timestamp, dpy); ctx->proc->vsync(ctx->proc, dpy, timestamp); } static void handle_blank_event(hwc_context_t* ctx, int dpy, char *data) { if (!strncmp(data, PANEL_ON_STR, strlen(PANEL_ON_STR))) { unsigned long int poweron = strtoul(data + strlen(PANEL_ON_STR), NULL, 0); ALOGI("%s: dpy:%d panel power state: %ld", __FUNCTION__, dpy, poweron); ctx->dpyAttr[dpy].isActive = poweron ? true: false; } } struct event { const char* name; void (*callback)(hwc_context_t* ctx, int dpy, char *data); }; struct event event_list[] = { { "vsync_event", handle_vsync_event }, { "show_blank_event", handle_blank_event }, }; #define num_events ARRAY_LENGTH(event_list) #define VSYNC_FAILURE_THRESHOLD 2 static void *vsync_loop(void *param) { hwc_context_t * ctx = reinterpret_cast(param); char thread_name[64] = HWC_VSYNC_THREAD_NAME; prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0); setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY + android::PRIORITY_MORE_FAVORABLE); char vdata[MAX_DATA]; //Number of physical displays //We poll on all the nodes. int num_displays = HWC_NUM_DISPLAY_TYPES - 1; struct pollfd pfd[num_displays][num_events]; char property[PROPERTY_VALUE_MAX]; if(property_get("debug.hwc.fakevsync", property, NULL) > 0) { if(atoi(property) == 1) ctx->vstate.fakevsync = true; } char node_path[MAX_SYSFS_FILE_PATH]; #ifdef VSYNC_FAILURE_FALLBACK int fake_vsync_switch_cnt = 0; #endif for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { for(size_t ev = 0; ev < num_events; ev++) { snprintf(node_path, sizeof(node_path), "/sys/class/graphics/fb%d/%s", dpy == HWC_DISPLAY_PRIMARY ? 0 : overlay::Overlay::getInstance()-> getFbForDpy(HWC_DISPLAY_EXTERNAL), event_list[ev].name); ALOGI("%s: Reading event %zu for dpy %d from %s", __FUNCTION__, ev, dpy, node_path); pfd[dpy][ev].fd = open(node_path, O_RDONLY); if (dpy == HWC_DISPLAY_PRIMARY && pfd[dpy][ev].fd < 0) { // Make sure fb device is opened before starting // this thread so this never happens. ALOGE ("%s:unable to open event node for dpy=%d event=%zu, %s", __FUNCTION__, dpy, ev, strerror(errno)); if (ev == 0) { ctx->vstate.fakevsync = true; //XXX: Blank events don't work with fake vsync, //but we shouldn't be running on fake vsync anyway. break; } } pread(pfd[dpy][ev].fd, vdata , MAX_DATA, 0); if (pfd[dpy][ev].fd >= 0) pfd[dpy][ev].events = POLLPRI | POLLERR; } } if (LIKELY(!ctx->vstate.fakevsync)) { do { int err = poll(*pfd, (int)(num_displays * num_events), -1); if(err > 0) { for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { for(size_t ev = 0; ev < num_events; ev++) { if (pfd[dpy][ev].revents & POLLPRI) { ssize_t len = pread(pfd[dpy][ev].fd, vdata, MAX_DATA, 0); if (UNLIKELY(len < 0)) { // If the read was just interrupted - it is not // a fatal error. Just continue in this case ALOGE ("%s: Unable to read event:%zu for \ dpy=%d : %s", __FUNCTION__, ev, dpy, strerror(errno)); #ifdef VSYNC_FAILURE_FALLBACK fake_vsync_switch_cnt++; if (fake_vsync_switch_cnt > VSYNC_FAILURE_THRESHOLD) { ALOGE("%s: Too many errors, falling back to fake vsync ", __FUNCTION__); ctx->vstate.fakevsync = true; goto vsync_failed; } #endif continue; } event_list[ev].callback(ctx, dpy, vdata); } } } } else { ALOGE("%s: poll failed errno: %s", __FUNCTION__, strerror(errno)); continue; } } while (true); } else { #ifdef VSYNC_FAILURE_FALLBACK vsync_failed: #endif //Fake vsync is used only when set explicitly through a property or when //the vsync timestamp node cannot be opened at bootup. There is no //fallback to fake vsync from the true vsync loop, ever, as the //condition can easily escape detection. //Also, fake vsync is delivered only for the primary display. do { usleep(16666); uint64_t timestamp = systemTime(); ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY, timestamp); } while (true); } for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) { for( size_t event = 0; event < num_events; event++) { if(pfd[dpy][event].fd >= 0) close (pfd[dpy][event].fd); } } return NULL; } void init_vsync_thread(hwc_context_t* ctx) { int ret; pthread_t vsync_thread; ALOGI("Initializing VSYNC Thread"); ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx); if (ret) { ALOGE("%s: failed to create %s: %s", __FUNCTION__, HWC_VSYNC_THREAD_NAME, strerror(ret)); } } }; //namespace