1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 * Copyright (C) 2012-2014, 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 #include "overlay.h"
33 #include <inttypes.h>
34
35 namespace qhwc {
36
37 #define HWC_VSYNC_THREAD_NAME "hwcVsyncThread"
38 #define MAX_SYSFS_FILE_PATH 255
39 #define PANEL_ON_STR "panel_power_on ="
40 #define ARRAY_LENGTH(array) (sizeof((array))/sizeof((array)[0]))
41 const int MAX_DATA = 64;
42
hwc_vsync_control(hwc_context_t * ctx,int dpy,int enable)43 int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable)
44 {
45 int ret = 0;
46 if(!ctx->vstate.fakevsync &&
47 ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL,
48 &enable) < 0) {
49 ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s",
50 __FUNCTION__, dpy, enable, strerror(errno));
51 ret = -errno;
52 }
53 return ret;
54 }
55
handle_vsync_event(hwc_context_t * ctx,int dpy,char * data)56 static void handle_vsync_event(hwc_context_t* ctx, int dpy, char *data)
57 {
58 // extract timestamp
59 uint64_t timestamp = 0;
60 if (!strncmp(data, "VSYNC=", strlen("VSYNC="))) {
61 timestamp = strtoull(data + strlen("VSYNC="), NULL, 0);
62 }
63 // send timestamp to SurfaceFlinger
64 ALOGD_IF (ctx->vstate.debug, "%s: timestamp %" PRIu64 " sent to SF for dpy=%d",
65 __FUNCTION__, timestamp, dpy);
66 ctx->proc->vsync(ctx->proc, dpy, timestamp);
67 }
68
handle_blank_event(hwc_context_t * ctx,int dpy,char * data)69 static void handle_blank_event(hwc_context_t* ctx, int dpy, char *data)
70 {
71 if (!strncmp(data, PANEL_ON_STR, strlen(PANEL_ON_STR))) {
72 unsigned long int poweron = strtoul(data + strlen(PANEL_ON_STR), NULL, 0);
73 ALOGI("%s: dpy:%d panel power state: %ld", __FUNCTION__, dpy, poweron);
74 ctx->dpyAttr[dpy].isActive = poweron ? true: false;
75 }
76 }
77
78 struct event {
79 const char* name;
80 void (*callback)(hwc_context_t* ctx, int dpy, char *data);
81 };
82
83 struct event event_list[] = {
84 { "vsync_event", handle_vsync_event },
85 { "show_blank_event", handle_blank_event },
86 };
87
88 #define num_events ARRAY_LENGTH(event_list)
89 #define VSYNC_FAILURE_THRESHOLD 2
90
vsync_loop(void * param)91 static void *vsync_loop(void *param)
92 {
93 hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
94
95 char thread_name[64] = HWC_VSYNC_THREAD_NAME;
96 prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
97 setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY +
98 android::PRIORITY_MORE_FAVORABLE);
99
100 char vdata[MAX_DATA];
101 //Number of physical displays
102 //We poll on all the nodes.
103 int num_displays = HWC_NUM_DISPLAY_TYPES - 1;
104 struct pollfd pfd[num_displays][num_events];
105
106 char property[PROPERTY_VALUE_MAX];
107 if(property_get("debug.hwc.fakevsync", property, NULL) > 0) {
108 if(atoi(property) == 1)
109 ctx->vstate.fakevsync = true;
110 }
111
112 char node_path[MAX_SYSFS_FILE_PATH];
113 #ifdef VSYNC_FAILURE_FALLBACK
114 int fake_vsync_switch_cnt = 0;
115 #endif
116
117 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
118 for(size_t ev = 0; ev < num_events; ev++) {
119 snprintf(node_path, sizeof(node_path),
120 "/sys/class/graphics/fb%d/%s",
121 dpy == HWC_DISPLAY_PRIMARY ? 0 :
122 overlay::Overlay::getInstance()->
123 getFbForDpy(HWC_DISPLAY_EXTERNAL),
124 event_list[ev].name);
125
126 ALOGI("%s: Reading event %zu for dpy %d from %s", __FUNCTION__,
127 ev, dpy, node_path);
128 pfd[dpy][ev].fd = open(node_path, O_RDONLY);
129
130 if (dpy == HWC_DISPLAY_PRIMARY && pfd[dpy][ev].fd < 0) {
131 // Make sure fb device is opened before starting
132 // this thread so this never happens.
133 ALOGE ("%s:unable to open event node for dpy=%d event=%zu, %s",
134 __FUNCTION__, dpy, ev, strerror(errno));
135 if (ev == 0) {
136 ctx->vstate.fakevsync = true;
137 //XXX: Blank events don't work with fake vsync,
138 //but we shouldn't be running on fake vsync anyway.
139 break;
140 }
141 }
142
143 pread(pfd[dpy][ev].fd, vdata , MAX_DATA, 0);
144 if (pfd[dpy][ev].fd >= 0)
145 pfd[dpy][ev].events = POLLPRI | POLLERR;
146 }
147 }
148
149 if (LIKELY(!ctx->vstate.fakevsync)) {
150 do {
151 int err = poll(*pfd, (int)(num_displays * num_events), -1);
152 if(err > 0) {
153 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
154 for(size_t ev = 0; ev < num_events; ev++) {
155 if (pfd[dpy][ev].revents & POLLPRI) {
156 ssize_t len = pread(pfd[dpy][ev].fd, vdata, MAX_DATA, 0);
157 if (UNLIKELY(len < 0)) {
158 // If the read was just interrupted - it is not
159 // a fatal error. Just continue in this case
160 ALOGE ("%s: Unable to read event:%zu for \
161 dpy=%d : %s",
162 __FUNCTION__, ev, dpy, strerror(errno));
163 #ifdef VSYNC_FAILURE_FALLBACK
164 fake_vsync_switch_cnt++;
165 if (fake_vsync_switch_cnt >
166 VSYNC_FAILURE_THRESHOLD) {
167 ALOGE("%s: Too many errors, falling back to fake vsync ",
168 __FUNCTION__);
169 ctx->vstate.fakevsync = true;
170 goto vsync_failed;
171 }
172 #endif
173 continue;
174 }
175 event_list[ev].callback(ctx, dpy, vdata);
176 }
177 }
178 }
179 } else {
180 ALOGE("%s: poll failed errno: %s", __FUNCTION__,
181 strerror(errno));
182 continue;
183 }
184 } while (true);
185
186 } else {
187
188 #ifdef VSYNC_FAILURE_FALLBACK
189 vsync_failed:
190 #endif
191 //Fake vsync is used only when set explicitly through a property or when
192 //the vsync timestamp node cannot be opened at bootup. There is no
193 //fallback to fake vsync from the true vsync loop, ever, as the
194 //condition can easily escape detection.
195 //Also, fake vsync is delivered only for the primary display.
196 do {
197 usleep(16666);
198 uint64_t timestamp = systemTime();
199 ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY, timestamp);
200
201 } while (true);
202 }
203
204 for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) {
205 for( size_t event = 0; event < num_events; event++) {
206 if(pfd[dpy][event].fd >= 0)
207 close (pfd[dpy][event].fd);
208 }
209 }
210
211 return NULL;
212 }
213
init_vsync_thread(hwc_context_t * ctx)214 void init_vsync_thread(hwc_context_t* ctx)
215 {
216 int ret;
217 pthread_t vsync_thread;
218 ALOGI("Initializing VSYNC Thread");
219 ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx);
220 if (ret) {
221 ALOGE("%s: failed to create %s: %s", __FUNCTION__,
222 HWC_VSYNC_THREAD_NAME, strerror(ret));
223 }
224 }
225
226 }; //namespace
227