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 "hdmi.h"
31#include "qd_utils.h"
32#include "string.h"
33#include "overlay.h"
34#include <inttypes.h>
35
36using namespace qdutils;
37namespace qhwc {
38
39#define HWC_VSYNC_THREAD_NAME "hwcVsyncThread"
40#define PANEL_ON_STR "panel_power_on ="
41#define ARRAY_LENGTH(array) (sizeof((array))/sizeof((array)[0]))
42#define MAX_THERMAL_LEVEL 3
43const int MAX_DATA = 64;
44
45int hwc_vsync_control(hwc_context_t* ctx, int dpy, int enable)
46{
47    int ret = 0;
48    if(!ctx->vstate.fakevsync &&
49       ioctl(ctx->dpyAttr[dpy].fd, MSMFB_OVERLAY_VSYNC_CTRL,
50             &enable) < 0) {
51        ALOGE("%s: vsync control failed. Dpy=%d, enable=%d : %s",
52              __FUNCTION__, dpy, enable, strerror(errno));
53        ret = -errno;
54    }
55    return ret;
56}
57
58static void handle_vsync_event(hwc_context_t* ctx, int dpy, char *data)
59{
60    // extract timestamp
61    uint64_t timestamp = 0;
62    if (!strncmp(data, "VSYNC=", strlen("VSYNC="))) {
63        timestamp = strtoull(data + strlen("VSYNC="), NULL, 0);
64    }
65    // send timestamp to SurfaceFlinger
66    ALOGD_IF (ctx->vstate.debug, "%s: timestamp %" PRIu64 " sent to SF for dpy=%d",
67            __FUNCTION__, timestamp, dpy);
68    ctx->proc->vsync(ctx->proc, dpy, timestamp);
69}
70
71static void handle_blank_event(hwc_context_t* ctx, int dpy, char *data)
72{
73    if (!strncmp(data, PANEL_ON_STR, strlen(PANEL_ON_STR))) {
74        unsigned long int poweron = strtoul(data + strlen(PANEL_ON_STR), NULL, 0);
75        ALOGI("%s: dpy:%d panel power state: %ld", __FUNCTION__, dpy, poweron);
76        if (!ctx->mHDMIDisplay->isHDMIPrimaryDisplay()) {
77            ctx->dpyAttr[dpy].isActive = poweron ? true: false;
78        }
79    }
80}
81
82static void handle_thermal_event(hwc_context_t* ctx, int dpy, char *data)
83{
84    // extract thermal level
85    uint64_t thermalLevel = 0;
86    if (!strncmp(data, "thermal_level=", strlen("thermal_level="))) {
87        thermalLevel = strtoull(data + strlen("thermal_level="), NULL, 0);
88    }
89
90    if (thermalLevel >= MAX_THERMAL_LEVEL) {
91        ALOGD("%s: dpy:%d thermal_level=%" PRIu64 "",__FUNCTION__,dpy,thermalLevel);
92        ctx->mThermalBurstMode = true;
93    } else
94        ctx->mThermalBurstMode = false;
95}
96
97struct event {
98    const char* name;
99    void (*callback)(hwc_context_t* ctx, int dpy, char *data);
100};
101
102struct event event_list[] =  {
103    { "vsync_event", handle_vsync_event },
104    { "show_blank_event", handle_blank_event },
105    { "msm_fb_thermal_level", handle_thermal_event },
106};
107
108#define num_events ARRAY_LENGTH(event_list)
109
110static void *vsync_loop(void *param)
111{
112    hwc_context_t * ctx = reinterpret_cast<hwc_context_t *>(param);
113
114    char thread_name[64] = HWC_VSYNC_THREAD_NAME;
115    prctl(PR_SET_NAME, (unsigned long) &thread_name, 0, 0, 0);
116    setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY +
117                android::PRIORITY_MORE_FAVORABLE);
118
119    char vdata[MAX_DATA];
120    //Number of physical displays
121    //We poll on all the nodes.
122    int num_displays = HWC_NUM_DISPLAY_TYPES - 1;
123    struct pollfd pfd[num_displays][num_events];
124
125    char property[PROPERTY_VALUE_MAX];
126    if(property_get("debug.hwc.fakevsync", property, NULL) > 0) {
127        if(atoi(property) == 1)
128            ctx->vstate.fakevsync = true;
129    }
130
131    char node_path[MAX_SYSFS_FILE_PATH];
132
133    for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
134        for(size_t ev = 0; ev < num_events; ev++) {
135            snprintf(node_path, sizeof(node_path),
136                    "/sys/class/graphics/fb%d/%s",
137                    dpy == HWC_DISPLAY_PRIMARY ? 0 :
138                    overlay::Overlay::getInstance()->
139                    getFbForDpy(HWC_DISPLAY_EXTERNAL),
140                    event_list[ev].name);
141
142            ALOGI("%s: Reading event %zu for dpy %d from %s", __FUNCTION__,
143                    ev, dpy, node_path);
144            pfd[dpy][ev].fd = open(node_path, O_RDONLY);
145
146            if (dpy == HWC_DISPLAY_PRIMARY && pfd[dpy][ev].fd < 0) {
147                // Make sure fb device is opened before starting
148                // this thread so this never happens.
149                ALOGE ("%s:unable to open event node for dpy=%d event=%zu, %s",
150                        __FUNCTION__, dpy, ev, strerror(errno));
151                if (ev == 0) {
152                    ctx->vstate.fakevsync = true;
153                    //XXX: Blank events don't work with fake vsync,
154                    //but we shouldn't be running on fake vsync anyway.
155                    break;
156                }
157            }
158
159            memset(&vdata, '\0', sizeof(vdata));
160            // Read once from the fds to clear the first notify
161            pread(pfd[dpy][ev].fd, vdata , MAX_DATA - 1, 0);
162            if (pfd[dpy][ev].fd >= 0)
163                pfd[dpy][ev].events = POLLPRI | POLLERR;
164        }
165    }
166
167    if (LIKELY(!ctx->vstate.fakevsync)) {
168        do {
169            int err = poll(*pfd, (int)(num_displays * num_events), -1);
170            if(err > 0) {
171                for (int dpy = HWC_DISPLAY_PRIMARY; dpy < num_displays; dpy++) {
172                    for(size_t ev = 0; ev < num_events; ev++) {
173                        if (pfd[dpy][ev].revents & POLLPRI) {
174                            // Clear vdata before writing into it
175                            memset(&vdata, '\0', sizeof(vdata));
176                            ssize_t len = pread(pfd[dpy][ev].fd, vdata,
177                                                MAX_DATA - 1, 0);
178                            if (UNLIKELY(len < 0)) {
179                                // If the read was just interrupted - it is not
180                                // a fatal error. Just continue in this case
181                                ALOGE ("%s: Unable to read event:%zu for \
182                                        dpy=%d : %s",
183                                        __FUNCTION__, ev, dpy, strerror(errno));
184                                continue;
185                            }
186                            vdata[len] = '\0';
187                            event_list[ev].callback(ctx, dpy, vdata);
188                        }
189                    }
190                }
191            } else {
192                ALOGE("%s: poll failed errno: %s", __FUNCTION__,
193                        strerror(errno));
194                continue;
195            }
196        } while (true);
197
198    } else {
199
200        //Fake vsync is used only when set explicitly through a property or when
201        //the vsync timestamp node cannot be opened at bootup. There is no
202        //fallback to fake vsync from the true vsync loop, ever, as the
203        //condition can easily escape detection.
204        //Also, fake vsync is delivered only for the primary display.
205        do {
206            usleep(16666);
207            uint64_t timestamp = systemTime();
208            ctx->proc->vsync(ctx->proc, HWC_DISPLAY_PRIMARY, timestamp);
209
210        } while (true);
211    }
212
213    for (int dpy = HWC_DISPLAY_PRIMARY; dpy <= HWC_DISPLAY_EXTERNAL; dpy++ ) {
214        for( size_t event = 0; event < num_events; event++) {
215            if(pfd[dpy][event].fd >= 0)
216                close (pfd[dpy][event].fd);
217        }
218    }
219
220    return NULL;
221}
222
223void init_vsync_thread(hwc_context_t* ctx)
224{
225    int ret;
226    pthread_t vsync_thread;
227    ALOGI("Initializing VSYNC Thread");
228    ret = pthread_create(&vsync_thread, NULL, vsync_loop, (void*) ctx);
229    if (ret) {
230        ALOGE("%s: failed to create %s: %s", __FUNCTION__,
231              HWC_VSYNC_THREAD_NAME, strerror(ret));
232    }
233}
234
235}; //namespace
236