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 <poll.h>
29 #include "hwc_utils.h"
30 #include "string.h"
31 #include "external.h"
32
33 namespace qhwc {
34
35 #define HWC_VSYNC_THREAD_NAME "hwcVsyncThread"
36 #define MAX_SYSFS_FILE_PATH 255
37
hwc_vsync_control(hwc_context_t * ctx,int dpy,int enable)38 int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable)
39 {
40 int ret = 0;
41 if(!ctx->vstate.fakevsync &&
42 ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL,
43 &enable) < 0) {
44 ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s",
45 __FUNCTION__, dpy, enable, strerror(errno));
46 ret = -errno;
47 }
48 return ret;
49 }
50
vsync_loop(void * param)51 static void *vsync_loop(void *param)
52 {
53 hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
54
55 char thread_name[64] = HWC_VSYNC_THREAD_NAME;
56 prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
57 setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY +
58 android::PRIORITY_MORE_FAVORABLE);
59
60 const int MAX_DATA = 64;
61 char vdata[MAX_DATA];
62 bool logvsync = false;
63
64 struct pollfd pfd[2];
65 int fb_fd[2];
66 uint64_t timestamp[2];
67 int num_displays;
68
69 char property[PROPERTY_VALUE_MAX];
70 if(property_get("debug.hwc.fakevsync", property, NULL) > 0) {
71 if(atoi(property) == 1)
72 ctx->vstate.fakevsync = true;
73 }
74
75 if(property_get("debug.hwc.logvsync", property, 0) > 0) {
76 if(atoi(property) == 1)
77 logvsync = true;
78 }
79
80 if (ctx->mExtDisplay->getHDMIIndex() > 0)
81 num_displays = 2;
82 else
83 num_displays = 1;
84
85 char vsync_node_path[MAX_SYSFS_FILE_PATH];
86 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
87 snprintf(vsync_node_path, sizeof(vsync_node_path),
88 "/sys/class/graphics/fb%d/vsync_event",
89 dpy == HWC_DISPLAY_PRIMARY ? 0 :
90 ctx->mExtDisplay->getHDMIIndex());
91 ALOGI("%s: Reading vsync for dpy=%d from %s", __FUNCTION__, dpy,
92 vsync_node_path);
93 fb_fd[dpy] = open(vsync_node_path, O_RDONLY);
94
95 if (fb_fd[dpy] < 0) {
96 // Make sure fb device is opened before starting this thread so this
97 // never happens.
98 ALOGE ("%s:not able to open vsync node for dpy=%d, %s",
99 __FUNCTION__, dpy, strerror(errno));
100 if (dpy == HWC_DISPLAY_PRIMARY) {
101 ctx->vstate.fakevsync = true;
102 break;
103 }
104 }
105 // Read once from the fds to clear the first notify
106 pread(fb_fd[dpy], vdata , MAX_DATA, 0);
107
108 pfd[dpy].fd = fb_fd[dpy];
109 if (pfd[dpy].fd >= 0)
110 pfd[dpy].events = POLLPRI | POLLERR;
111 }
112
113 if (LIKELY(!ctx->vstate.fakevsync)) {
114 do {
115 int err = poll(pfd, num_displays, -1);
116 if(err > 0) {
117 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
118 if (pfd[dpy].revents & POLLPRI) {
119 int len = pread(pfd[dpy].fd, vdata, MAX_DATA, 0);
120 if (UNLIKELY(len < 0)) {
121 // If the read was just interrupted - it is not a
122 // fatal error. Just continue in this case
123 ALOGE ("%s: Unable to read vsync for dpy=%d : %s",
124 __FUNCTION__, dpy, strerror(errno));
125 continue;
126 }
127 // extract timestamp
128 if (!strncmp(vdata, "VSYNC=", strlen("VSYNC="))) {
129 timestamp[dpy] = strtoull(vdata + strlen("VSYNC="),
130 NULL, 0);
131 }
132 // send timestamp to SurfaceFlinger
133 ALOGD_IF (logvsync,
134 "%s: timestamp %llu sent to SF for dpy=%d",
135 __FUNCTION__, timestamp[dpy], dpy);
136 ctx->proc->vsync(ctx->proc, dpy, timestamp[dpy]);
137 }
138 }
139
140 } else {
141 ALOGE("%s: vsync poll failed errno: %s", __FUNCTION__,
142 strerror(errno));
143 continue;
144 }
145 } while (true);
146
147 } else {
148
149 //Fake vsync is used only when set explicitly through a property or when
150 //the vsync timestamp node cannot be opened at bootup. There is no
151 //fallback to fake vsync from the true vsync loop, ever, as the
152 //condition can easily escape detection.
153 //Also, fake vsync is delivered only for the primary display.
154 do {
155 usleep(16666);
156 timestamp[HWC_DISPLAY_PRIMARY] = systemTime();
157 ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY,
158 timestamp[HWC_DISPLAY_PRIMARY]);
159
160 } while (true);
161 }
162
163 for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) {
164 if(fb_fd[dpy] >= 0)
165 close (fb_fd[dpy]);
166 }
167
168 return NULL;
169 }
170
init_vsync_thread(hwc_context_t * ctx)171 void init_vsync_thread(hwc_context_t* ctx)
172 {
173 int ret;
174 pthread_t vsync_thread;
175 ALOGI("Initializing VSYNC Thread");
176 ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx);
177 if (ret) {
178 ALOGE("%s: failed to create %s: %s", __FUNCTION__,
179 HWC_VSYNC_THREAD_NAME, strerror(ret));
180 }
181 }
182
183 }; //namespace
184