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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  * Copyright (C) 2012-2013, 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 "hwc_utils.h"
     29 #include "string.h"
     30 #include "external.h"
     31 
     32 namespace qhwc {
     33 
     34 #define HWC_VSYNC_THREAD_NAME "hwcVsyncThread"
     35 
     36 int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable)
     37 {
     38     int ret = 0;
     39     if(!ctx->vstate.fakevsync &&
     40        ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL,
     41              &enable) < 0) {
     42         ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s",
     43               __FUNCTION__, dpy, enable, strerror(errno));
     44         ret = -errno;
     45     }
     46     return ret;
     47 }
     48 
     49 static void *vsync_loop(void *param)
     50 {
     51     const char* vsync_timestamp_fb0 = "/sys/class/graphics/fb0/vsync_event";
     52     const char* vsync_timestamp_fb1 = "/sys/class/graphics/fb1/vsync_event";
     53     int dpy = HWC_DISPLAY_PRIMARY;
     54 
     55     hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
     56 
     57     char thread_name[64] = HWC_VSYNC_THREAD_NAME;
     58     prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
     59     setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY +
     60                 android::PRIORITY_MORE_FAVORABLE);
     61 
     62     const int MAX_DATA = 64;
     63     static char vdata[MAX_DATA];
     64 
     65     uint64_t cur_timestamp=0;
     66     ssize_t len = -1;
     67     int fd_timestamp = -1;
     68     bool fb1_vsync = false;
     69     bool logvsync = false;
     70 
     71     char property[PROPERTY_VALUE_MAX];
     72     if(property_get("debug.hwc.fakevsync", property, NULL) > 0) {
     73         if(atoi(property) == 1)
     74             ctx->vstate.fakevsync = true;
     75     }
     76 
     77     if(property_get("debug.hwc.logvsync", property, 0) > 0) {
     78         if(atoi(property) == 1)
     79             logvsync = true;
     80     }
     81 
     82     /* Currently read vsync timestamp from drivers
     83        e.g. VSYNC=41800875994
     84        */
     85     fd_timestamp = open(vsync_timestamp_fb0, O_RDONLY);
     86     if (fd_timestamp < 0) {
     87         // Make sure fb device is opened before starting this thread so this
     88         // never happens.
     89         ALOGE ("FATAL:%s:not able to open file:%s, %s",  __FUNCTION__,
     90                (fb1_vsync) ? vsync_timestamp_fb1 : vsync_timestamp_fb0,
     91                strerror(errno));
     92         ctx->vstate.fakevsync = true;
     93     }
     94 
     95     do {
     96         if (LIKELY(!ctx->vstate.fakevsync)) {
     97             len = pread(fd_timestamp, vdata, MAX_DATA, 0);
     98             if (len < 0) {
     99                 // If the read was just interrupted - it is not a fatal error
    100                 // In either case, just continue.
    101                 if (errno != EAGAIN &&
    102                     errno != EINTR  &&
    103                     errno != EBUSY) {
    104                     ALOGE ("FATAL:%s:not able to read file:%s, %s",
    105                            __FUNCTION__,
    106                            vsync_timestamp_fb0, strerror(errno));
    107                 }
    108                 continue;
    109             }
    110             // extract timestamp
    111             const char *str = vdata;
    112             if (!strncmp(str, "VSYNC=", strlen("VSYNC="))) {
    113                 cur_timestamp = strtoull(str + strlen("VSYNC="), NULL, 0);
    114             }
    115         } else {
    116             usleep(16666);
    117             cur_timestamp = systemTime();
    118         }
    119         // send timestamp to HAL
    120         if(ctx->vstate.enable) {
    121             ALOGD_IF (logvsync, "%s: timestamp %llu sent to HWC for %s",
    122                       __FUNCTION__, cur_timestamp, "fb0");
    123             ctx->proc->vsync(ctx->proc, dpy, cur_timestamp);
    124         }
    125 
    126     } while (true);
    127     if(fd_timestamp >= 0)
    128         close (fd_timestamp);
    129 
    130     return NULL;
    131 }
    132 
    133 void init_vsync_thread(hwc_context_t* ctx)
    134 {
    135     int ret;
    136     pthread_t vsync_thread;
    137     ALOGI("Initializing VSYNC Thread");
    138     ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx);
    139     if (ret) {
    140         ALOGE("%s: failed to create %s: %s", __FUNCTION__,
    141               HWC_VSYNC_THREAD_NAME, strerror(ret));
    142     }
    143 }
    144 
    145 }; //namespace
    146