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 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 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 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 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 } 213 214 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
