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/*
* Copyright (C) Texas Instruments - http://www.ti.com/
*
* 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 <errno.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <sys/resource.h>
#include <pthread.h>
#include <time.h>
#include <cutils/properties.h>
#include <cutils/log.h>
#include <utils/Timers.h>
#include "hwc_dev.h"
static pthread_t vsync_thread;
static pthread_mutex_t vsync_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t vsync_cond;
static bool vsync_loop_active = false;
nsecs_t vsync_rate;
static struct timespec diff(struct timespec start, struct timespec end)
{
struct timespec temp;
if ((end.tv_nsec - start.tv_nsec) < 0) {
temp.tv_sec = end.tv_sec-start.tv_sec - 1;
temp.tv_nsec = 1000000000 + end.tv_nsec-start.tv_nsec;
} else {
temp.tv_sec = end.tv_sec - start.tv_sec;
temp.tv_nsec = end.tv_nsec - start.tv_nsec;
}
return temp;
}
static void *vsync_loop(void *data)
{
struct timespec tp, tp_next, tp_sleep;
nsecs_t now = 0, period = vsync_rate, next_vsync = 0, next_fake_vsync = 0, sleep = 0;
omap_hwc_device_t *hwc_dev = (omap_hwc_device_t *)data;
tp_sleep.tv_sec = tp_sleep.tv_nsec = 0;
bool reset_timers = true;
setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
for (;;) {
pthread_mutex_lock(&vsync_mutex);
period = vsync_rate; /* re-read rate */
while (!vsync_loop_active) {
pthread_cond_wait(&vsync_cond, &vsync_mutex);
}
pthread_mutex_unlock(&vsync_mutex);
clock_gettime(CLOCK_MONOTONIC, &tp);
now = (tp.tv_sec * 1000000000) + tp.tv_nsec;
next_vsync = next_fake_vsync;
sleep = next_vsync - now;
if (sleep < 0) {
/* we missed, find where the next vsync should be */
sleep = (period - ((now - next_vsync) % period));
next_vsync = now + sleep;
}
next_fake_vsync = next_vsync + period;
tp_next.tv_sec = (next_vsync / 1000000000);
tp_next.tv_nsec = (next_vsync % 1000000000);
tp_sleep = diff(tp, tp_next);
nanosleep(&tp_sleep, NULL);
if (hwc_dev->procs && hwc_dev->procs->vsync) {
hwc_dev->procs->vsync(hwc_dev->procs, 0, next_vsync);
}
}
return NULL;
}
bool use_sw_vsync()
{
char board[PROPERTY_VALUE_MAX];
bool rv = false;
property_get("ro.product.board", board, "");
if ((strncmp("blaze", board, PROPERTY_VALUE_MAX) == 0) ||
(strncmp("panda5", board, PROPERTY_VALUE_MAX) == 0)) {
/* TODO: panda5 really should support h/w vsync */
rv = true;
} else {
char value[PROPERTY_VALUE_MAX];
property_get("persist.hwc.sw_vsync", value, "0");
int use_sw_vsync = atoi(value);
rv = use_sw_vsync > 0;
}
ALOGI("Expecting %s vsync for %s", rv ? "s/w" : "h/w", board);
return rv;
}
void init_sw_vsync(omap_hwc_device_t *hwc_dev)
{
pthread_cond_init(&vsync_cond, NULL);
pthread_create(&vsync_thread, NULL, vsync_loop, (void *)hwc_dev);
}
void start_sw_vsync()
{
char refresh_rate[PROPERTY_VALUE_MAX];
property_get("persist.hwc.sw_vsync_rate", refresh_rate, "60");
pthread_mutex_lock(&vsync_mutex);
int rate = atoi(refresh_rate);
if (rate <= 0)
rate = 60;
vsync_rate = 1000000000 / rate;
if (vsync_loop_active) {
pthread_mutex_unlock(&vsync_mutex);
return;
}
vsync_loop_active = true;
pthread_mutex_unlock(&vsync_mutex);
pthread_cond_signal(&vsync_cond);
}
void stop_sw_vsync()
{
pthread_mutex_lock(&vsync_mutex);
if (!vsync_loop_active) {
pthread_mutex_unlock(&vsync_mutex);
return;
}
vsync_loop_active = false;
pthread_mutex_unlock(&vsync_mutex);
pthread_cond_signal(&vsync_cond);
}
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