| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * Copyright (C) 2012-2013, 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 <cutils/properties.h> |
| #include <utils/Log.h> |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include <linux/msm_mdp.h> |
| #include <sys/resource.h> |
| #include <sys/prctl.h> |
| #include <poll.h> |
| #include "hwc_utils.h" |
| #include "string.h" |
| #include "external.h" |
| |
| namespace qhwc { |
| |
| #define HWC_VSYNC_THREAD_NAME "hwcVsyncThread" |
| #define MAX_SYSFS_FILE_PATH 255 |
| |
| 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 *vsync_loop(void *param) |
| { |
| hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(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); |
| |
| const int MAX_DATA = 64; |
| char vdata[MAX_DATA]; |
| bool logvsync = false; |
| |
| struct pollfd pfd[2]; |
| int fb_fd[2]; |
| uint64_t timestamp[2]; |
| int num_displays; |
| |
| char property[PROPERTY_VALUE_MAX]; |
| if(property_get("debug.hwc.fakevsync", property, NULL) > 0) { |
| if(atoi(property) == 1) |
| ctx->vstate.fakevsync = true; |
| } |
| |
| if(property_get("debug.hwc.logvsync", property, 0) > 0) { |
| if(atoi(property) == 1) |
| logvsync = true; |
| } |
| |
| if (ctx->mExtDisplay->getHDMIIndex() > 0) |
| num_displays = 2; |
| else |
| num_displays = 1; |
| |
| char vsync_node_path[MAX_SYSFS_FILE_PATH]; |
| for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { |
| snprintf(vsync_node_path, sizeof(vsync_node_path), |
| "/sys/class/graphics/fb%d/vsync_event", |
| dpy == HWC_DISPLAY_PRIMARY ? 0 : |
| ctx->mExtDisplay->getHDMIIndex()); |
| ALOGI("%s: Reading vsync for dpy=%d from %s", __FUNCTION__, dpy, |
| vsync_node_path); |
| fb_fd[dpy] = open(vsync_node_path, O_RDONLY); |
| |
| if (fb_fd[dpy] < 0) { |
| // Make sure fb device is opened before starting this thread so this |
| // never happens. |
| ALOGE ("%s:not able to open vsync node for dpy=%d, %s", |
| __FUNCTION__, dpy, strerror(errno)); |
| if (dpy == HWC_DISPLAY_PRIMARY) { |
| ctx->vstate.fakevsync = true; |
| break; |
| } |
| } |
| // Read once from the fds to clear the first notify |
| pread(fb_fd[dpy], vdata , MAX_DATA, 0); |
| |
| pfd[dpy].fd = fb_fd[dpy]; |
| if (pfd[dpy].fd >= 0) |
| pfd[dpy].events = POLLPRI | POLLERR; |
| } |
| |
| if (LIKELY(!ctx->vstate.fakevsync)) { |
| do { |
| int err = poll(pfd, num_displays, -1); |
| if(err > 0) { |
| for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) { |
| if (pfd[dpy].revents & POLLPRI) { |
| int len = pread(pfd[dpy].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 vsync for dpy=%d : %s", |
| __FUNCTION__, dpy, strerror(errno)); |
| continue; |
| } |
| // extract timestamp |
| if (!strncmp(vdata, "VSYNC=", strlen("VSYNC="))) { |
| timestamp[dpy] = strtoull(vdata + strlen("VSYNC="), |
| NULL, 0); |
| } |
| // send timestamp to SurfaceFlinger |
| ALOGD_IF (logvsync, |
| "%s: timestamp %llu sent to SF for dpy=%d", |
| __FUNCTION__, timestamp[dpy], dpy); |
| ctx->proc->vsync(ctx->proc, dpy, timestamp[dpy]); |
| } |
| } |
| |
| } else { |
| ALOGE("%s: vsync poll failed errno: %s", __FUNCTION__, |
| strerror(errno)); |
| continue; |
| } |
| } while (true); |
| |
| } else { |
| |
| //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); |
| timestamp[HWC_DISPLAY_PRIMARY] = systemTime(); |
| ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY, |
| timestamp[HWC_DISPLAY_PRIMARY]); |
| |
| } while (true); |
| } |
| |
| for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) { |
| if(fb_fd[dpy] >= 0) |
| close (fb_fd[dpy]); |
| } |
| |
| 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 |
