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 #define __STDC_FORMAT_MACROS 1
34 #include <inttypes.h>
35
36 namespace qhwc {
37
38 #define HWC_VSYNC_THREAD_NAME "hwcVsyncThread"
39 #define MAX_SYSFS_FILE_PATH 255
40 #define PANEL_ON_STR "panel_power_on ="
41 #define ARRAY_LENGTH(array) (sizeof((array))/sizeof((array)[0]))
42 const int MAX_DATA = 64;
43
hwc_vsync_control(hwc_context_t * ctx,int dpy,int enable)44 int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable)
45 {
46 int ret = 0;
47 if(!ctx->vstate.fakevsync &&
48 ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL,
49 &enable) < 0) {
50 ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s",
51 __FUNCTION__, dpy, enable, strerror(errno));
52 ret = -errno;
53 }
54 return ret;
55 }
56
handle_vsync_event(hwc_context_t * ctx,int dpy,char * data)57 static void handle_vsync_event(hwc_context_t* ctx, int dpy, char *data)
58 {
59 // extract timestamp
60 uint64_t timestamp = 0;
61 if (!strncmp(data, "VSYNC=", strlen("VSYNC="))) {
62 timestamp = strtoull(data + strlen("VSYNC="), NULL, 0);
63 }
64 // send timestamp to SurfaceFlinger
65 ALOGD_IF (ctx->vstate.debug, "%s: timestamp %" PRIu64 " sent to SF for dpy=%d",
66 __FUNCTION__, timestamp, dpy);
67 ctx->proc->vsync(ctx->proc, dpy, timestamp);
68 }
69
handle_blank_event(hwc_context_t * ctx,int dpy,char * data)70 static void handle_blank_event(hwc_context_t* ctx, int dpy, char *data)
71 {
72 if (!strncmp(data, PANEL_ON_STR, strlen(PANEL_ON_STR))) {
73 unsigned long int poweron = strtoul(data + strlen(PANEL_ON_STR), NULL, 0);
74 ALOGI("%s: dpy:%d panel power state: %ld", __FUNCTION__, dpy, poweron);
75 ctx->dpyAttr[dpy].isActive = poweron ? true: false;
76 }
77 }
78
79 struct event {
80 const char* name;
81 void (*callback)(hwc_context_t* ctx, int dpy, char *data);
82 };
83
84 struct event event_list[] = {
85 { "vsync_event", handle_vsync_event },
86 { "show_blank_event", handle_blank_event },
87 };
88
89 #define num_events ARRAY_LENGTH(event_list)
90 #define VSYNC_FAILURE_THRESHOLD 2
91
vsync_loop(void * param)92 static void *vsync_loop(void *param)
93 {
94 hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
95
96 char thread_name[64] = HWC_VSYNC_THREAD_NAME;
97 prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
98 setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY +
99 android::PRIORITY_MORE_FAVORABLE);
100
101 char vdata[MAX_DATA];
102 //Number of physical displays
103 //We poll on all the nodes.
104 int num_displays = HWC_NUM_DISPLAY_TYPES - 1;
105 struct pollfd pfd[num_displays][num_events];
106
107 char property[PROPERTY_VALUE_MAX];
108 if(property_get("debug.hwc.fakevsync", property, NULL) > 0) {
109 if(atoi(property) == 1)
110 ctx->vstate.fakevsync = true;
111 }
112
113 char node_path[MAX_SYSFS_FILE_PATH];
114 #ifdef VSYNC_FAILURE_FALLBACK
115 int fake_vsync_switch_cnt = 0;
116 #endif
117
118 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
119 for(size_t ev = 0; ev < num_events; ev++) {
120 snprintf(node_path, sizeof(node_path),
121 "/sys/class/graphics/fb%d/%s",
122 dpy == HWC_DISPLAY_PRIMARY ? 0 :
123 overlay::Overlay::getInstance()->
124 getFbForDpy(HWC_DISPLAY_EXTERNAL),
125 event_list[ev].name);
126
127 ALOGI("%s: Reading event %zu for dpy %d from %s", __FUNCTION__,
128 ev, dpy, node_path);
129 pfd[dpy][ev].fd = open(node_path, O_RDONLY);
130
131 if (dpy == HWC_DISPLAY_PRIMARY && pfd[dpy][ev].fd < 0) {
132 // Make sure fb device is opened before starting
133 // this thread so this never happens.
134 ALOGE ("%s:unable to open event node for dpy=%d event=%zu, %s",
135 __FUNCTION__, dpy, ev, strerror(errno));
136 if (ev == 0) {
137 ctx->vstate.fakevsync = true;
138 //XXX: Blank events don't work with fake vsync,
139 //but we shouldn't be running on fake vsync anyway.
140 break;
141 }
142 }
143
144 pread(pfd[dpy][ev].fd, vdata , MAX_DATA, 0);
145 if (pfd[dpy][ev].fd >= 0)
146 pfd[dpy][ev].events = POLLPRI | POLLERR;
147 }
148 }
149
150 if (LIKELY(!ctx->vstate.fakevsync)) {
151 do {
152 int err = poll(*pfd, (int)(num_displays * num_events), -1);
153 if(err > 0) {
154 for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
155 for(size_t ev = 0; ev < num_events; ev++) {
156 if (pfd[dpy][ev].revents & POLLPRI) {
157 ssize_t len = pread(pfd[dpy][ev].fd, vdata, MAX_DATA, 0);
158 if (UNLIKELY(len < 0)) {
159 // If the read was just interrupted - it is not
160 // a fatal error. Just continue in this case
161 ALOGE ("%s: Unable to read event:%zu for \
162 dpy=%d : %s",
163 __FUNCTION__, ev, dpy, strerror(errno));
164 #ifdef VSYNC_FAILURE_FALLBACK
165 fake_vsync_switch_cnt++;
166 if (fake_vsync_switch_cnt >
167 VSYNC_FAILURE_THRESHOLD) {
168 ALOGE("%s: Too many errors, falling back to fake vsync ",
169 __FUNCTION__);
170 ctx->vstate.fakevsync = true;
171 goto vsync_failed;
172 }
173 #endif
174 continue;
175 }
176 event_list[ev].callback(ctx, dpy, vdata);
177 }
178 }
179 }
180 } else {
181 ALOGE("%s: poll failed errno: %s", __FUNCTION__,
182 strerror(errno));
183 continue;
184 }
185 } while (true);
186
187 } else {
188
189 #ifdef VSYNC_FAILURE_FALLBACK
190 vsync_failed:
191 #endif
192 //Fake vsync is used only when set explicitly through a property or when
193 //the vsync timestamp node cannot be opened at bootup. There is no
194 //fallback to fake vsync from the true vsync loop, ever, as the
195 //condition can easily escape detection.
196 //Also, fake vsync is delivered only for the primary display.
197 do {
198 usleep(16666);
199 uint64_t timestamp = systemTime();
200 ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY, timestamp);
201
202 } while (true);
203 }
204
205 for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) {
206 for( size_t event = 0; event < num_events; event++) {
207 if(pfd[dpy][event].fd >= 0)
208 close (pfd[dpy][event].fd);
209 }
210 }
211
212 return NULL;
213 }
214
init_vsync_thread(hwc_context_t * ctx)215 void init_vsync_thread(hwc_context_t* ctx)
216 {
217 int ret;
218 pthread_t vsync_thread;
219 ALOGI("Initializing VSYNC Thread");
220 ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx);
221 if (ret) {
222 ALOGE("%s: failed to create %s: %s", __FUNCTION__,
223 HWC_VSYNC_THREAD_NAME, strerror(ret));
224 }
225 }
226
227 }; //namespace
228