drivers/media/platform/vivid/vivid-kthread-out.c

   1 /*
   2  * vivid-kthread-out.h - video/vbi output thread support functions.
   3  *
   4  * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
   5  *
   6  * This program is free software; you may redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  11  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  12  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  13  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  14  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  15  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  16  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  17  * SOFTWARE.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/errno.h>
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/sched.h>
  25 #include <linux/slab.h>
  26 #include <linux/font.h>
  27 #include <linux/mutex.h>
  28 #include <linux/videodev2.h>
  29 #include <linux/kthread.h>
  30 #include <linux/freezer.h>
  31 #include <linux/random.h>
  32 #include <linux/v4l2-dv-timings.h>
  33 #include <asm/div64.h>
  34 #include <media/videobuf2-vmalloc.h>
  35 #include <media/v4l2-dv-timings.h>
  36 #include <media/v4l2-ioctl.h>
  37 #include <media/v4l2-fh.h>
  38 #include <media/v4l2-event.h>
  39
  40 #include "vivid-core.h"
  41 #include "vivid-vid-common.h"
  42 #include "vivid-vid-cap.h"
  43 #include "vivid-vid-out.h"
  44 #include "vivid-radio-common.h"
  45 #include "vivid-radio-rx.h"
  46 #include "vivid-radio-tx.h"
  47 #include "vivid-sdr-cap.h"
  48 #include "vivid-vbi-cap.h"
  49 #include "vivid-vbi-out.h"
  50 #include "vivid-osd.h"
  51 #include "vivid-ctrls.h"
  52 #include "vivid-kthread-out.h"
  53
  54 static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
  55 {
  56         struct vivid_buffer *vid_out_buf = NULL;
  57         struct vivid_buffer *vbi_out_buf = NULL;
  58
  59         dprintk(dev, 1, "Video Output Thread Tick\n");
  60
  61         /* Drop a certain percentage of buffers. */
  62         if (dev->perc_dropped_buffers &&
  63             prandom_u32_max(100) < dev->perc_dropped_buffers)
  64                 return;
  65
  66         spin_lock(&dev->slock);
  67         /*
  68          * Only dequeue buffer if there is at least one more pending.
  69          * This makes video loopback possible.
  70          */
  71         if (!list_empty(&dev->vid_out_active) &&
  72             !list_is_singular(&dev->vid_out_active)) {
  73                 vid_out_buf = list_entry(dev->vid_out_active.next,
  74                                          struct vivid_buffer, list);
  75                 list_del(&vid_out_buf->list);
  76         }
  77         if (!list_empty(&dev->vbi_out_active) &&
  78             (dev->field_out != V4L2_FIELD_ALTERNATE ||
  79              (dev->vbi_out_seq_count & 1))) {
  80                 vbi_out_buf = list_entry(dev->vbi_out_active.next,
  81                                          struct vivid_buffer, list);
  82                 list_del(&vbi_out_buf->list);
  83         }
  84         spin_unlock(&dev->slock);
  85
  86         if (!vid_out_buf && !vbi_out_buf)
  87                 return;
  88
  89         if (vid_out_buf) {
  90                 vid_out_buf->vb.sequence = dev->vid_out_seq_count;
  91                 if (dev->field_out == V4L2_FIELD_ALTERNATE) {
  92                         /*
  93                          * The sequence counter counts frames, not fields.
  94                          * So divide by two.
  95                          */
  96                         vid_out_buf->vb.sequence /= 2;
  97                 }
  98                 vid_out_buf->vb.vb2_buf.timestamp =
  99                         ktime_get_ns() + dev->time_wrap_offset;
 100                 vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
 101                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 102                 dprintk(dev, 2, "vid_out buffer %d done\n",
 103                         vid_out_buf->vb.vb2_buf.index);
 104         }
 105
 106         if (vbi_out_buf) {
 107                 if (dev->stream_sliced_vbi_out)
 108                         vivid_sliced_vbi_out_process(dev, vbi_out_buf);
 109
 110                 vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
 111                 vbi_out_buf->vb.vb2_buf.timestamp =
 112                         ktime_get_ns() + dev->time_wrap_offset;
 113                 vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
 114                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 115                 dprintk(dev, 2, "vbi_out buffer %d done\n",
 116                         vbi_out_buf->vb.vb2_buf.index);
 117         }
 118         dev->dqbuf_error = false;
 119 }
 120
 121 static int vivid_thread_vid_out(void *data)
 122 {
 123         struct vivid_dev *dev = data;
 124         u64 numerators_since_start;
 125         u64 buffers_since_start;
 126         u64 next_jiffies_since_start;
 127         unsigned long jiffies_since_start;
 128         unsigned long cur_jiffies;
 129         unsigned wait_jiffies;
 130         unsigned numerator;
 131         unsigned denominator;
 132
 133         dprintk(dev, 1, "Video Output Thread Start\n");
 134
 135         set_freezable();
 136
 137         /* Resets frame counters */
 138         dev->out_seq_offset = 0;
 139         if (dev->seq_wrap)
 140                 dev->out_seq_count = 0xffffff80U;
 141         dev->jiffies_vid_out = jiffies;
 142         dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
 143         dev->out_seq_resync = false;
 144
 145         for (;;) {
 146                 try_to_freeze();
 147                 if (kthread_should_stop())
 148                         break;
 149
 150                 if (!mutex_trylock(&dev->mutex)) {
 151                         schedule_timeout_uninterruptible(1);
 152                         continue;
 153                 }
 154
 155                 cur_jiffies = jiffies;
 156                 if (dev->out_seq_resync) {
 157                         dev->jiffies_vid_out = cur_jiffies;
 158                         dev->out_seq_offset = dev->out_seq_count + 1;
 159                         dev->out_seq_count = 0;
 160                         dev->out_seq_resync = false;
 161                 }
 162                 numerator = dev->timeperframe_vid_out.numerator;
 163                 denominator = dev->timeperframe_vid_out.denominator;
 164
 165                 if (dev->field_out == V4L2_FIELD_ALTERNATE)
 166                         denominator *= 2;
 167
 168                 /* Calculate the number of jiffies since we started streaming */
 169                 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
 170                 /* Get the number of buffers streamed since the start */
 171                 buffers_since_start = (u64)jiffies_since_start * denominator +
 172                                       (HZ * numerator) / 2;
 173                 do_div(buffers_since_start, HZ * numerator);
 174
 175                 /*
 176                  * After more than 0xf0000000 (rounded down to a multiple of
 177                  * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
 178                  * jiffies have passed since we started streaming reset the
 179                  * counters and keep track of the sequence offset.
 180                  */
 181                 if (jiffies_since_start > JIFFIES_RESYNC) {
 182                         dev->jiffies_vid_out = cur_jiffies;
 183                         dev->out_seq_offset = buffers_since_start;
 184                         buffers_since_start = 0;
 185                 }
 186                 dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
 187                 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
 188                 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
 189
 190                 vivid_thread_vid_out_tick(dev);
 191                 mutex_unlock(&dev->mutex);
 192
 193                 /*
 194                  * Calculate the number of 'numerators' streamed since we started,
 195                  * not including the current buffer.
 196                  */
 197                 numerators_since_start = buffers_since_start * numerator;
 198
 199                 /* And the number of jiffies since we started */
 200                 jiffies_since_start = jiffies - dev->jiffies_vid_out;
 201
 202                 /* Increase by the 'numerator' of one buffer */
 203                 numerators_since_start += numerator;
 204                 /*
 205                  * Calculate when that next buffer is supposed to start
 206                  * in jiffies since we started streaming.
 207                  */
 208                 next_jiffies_since_start = numerators_since_start * HZ +
 209                                            denominator / 2;
 210                 do_div(next_jiffies_since_start, denominator);
 211                 /* If it is in the past, then just schedule asap */
 212                 if (next_jiffies_since_start < jiffies_since_start)
 213                         next_jiffies_since_start = jiffies_since_start;
 214
 215                 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
 216                 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
 217         }
 218         dprintk(dev, 1, "Video Output Thread End\n");
 219         return 0;
 220 }
 221
 222 static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
 223 {
 224         v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
 225         v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
 226         v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
 227         v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
 228         v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
 229 }
 230
 231 int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
 232 {
 233         dprintk(dev, 1, "%s\n", __func__);
 234
 235         if (dev->kthread_vid_out) {
 236                 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
 237
 238                 if (pstreaming == &dev->vid_out_streaming)
 239                         dev->vid_out_seq_start = seq_count;
 240                 else
 241                         dev->vbi_out_seq_start = seq_count;
 242                 *pstreaming = true;
 243                 return 0;
 244         }
 245
 246         /* Resets frame counters */
 247         dev->jiffies_vid_out = jiffies;
 248         dev->vid_out_seq_start = dev->seq_wrap * 128;
 249         dev->vbi_out_seq_start = dev->seq_wrap * 128;
 250
 251         dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
 252                         "%s-vid-out", dev->v4l2_dev.name);
 253
 254         if (IS_ERR(dev->kthread_vid_out)) {
 255                 int err = PTR_ERR(dev->kthread_vid_out);
 256
 257                 dev->kthread_vid_out = NULL;
 258                 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
 259                 return err;
 260         }
 261         *pstreaming = true;
 262         vivid_grab_controls(dev, true);
 263
 264         dprintk(dev, 1, "returning from %s\n", __func__);
 265         return 0;
 266 }
 267
 268 void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
 269 {
 270         dprintk(dev, 1, "%s\n", __func__);
 271
 272         if (dev->kthread_vid_out == NULL)
 273                 return;
 274
 275         *pstreaming = false;
 276         if (pstreaming == &dev->vid_out_streaming) {
 277                 /* Release all active buffers */
 278                 while (!list_empty(&dev->vid_out_active)) {
 279                         struct vivid_buffer *buf;
 280
 281                         buf = list_entry(dev->vid_out_active.next,
 282                                          struct vivid_buffer, list);
 283                         list_del(&buf->list);
 284                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 285                         dprintk(dev, 2, "vid_out buffer %d done\n",
 286                                 buf->vb.vb2_buf.index);
 287                 }
 288         }
 289
 290         if (pstreaming == &dev->vbi_out_streaming) {
 291                 while (!list_empty(&dev->vbi_out_active)) {
 292                         struct vivid_buffer *buf;
 293
 294                         buf = list_entry(dev->vbi_out_active.next,
 295                                          struct vivid_buffer, list);
 296                         list_del(&buf->list);
 297                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 298                         dprintk(dev, 2, "vbi_out buffer %d done\n",
 299                                 buf->vb.vb2_buf.index);
 300                 }
 301         }
 302
 303         if (dev->vid_out_streaming || dev->vbi_out_streaming)
 304                 return;
 305
 306         /* shutdown control thread */
 307         vivid_grab_controls(dev, false);
 308         kthread_stop(dev->kthread_vid_out);
 309         dev->kthread_vid_out = NULL;
 310 }