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