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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * vivid-kthread-out.h - video/vbi output thread support functions.
   4  *
   5  * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/errno.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/sched.h>
  13 #include <linux/slab.h>
  14 #include <linux/font.h>
  15 #include <linux/mutex.h>
  16 #include <linux/videodev2.h>
  17 #include <linux/kthread.h>
  18 #include <linux/freezer.h>
  19 #include <linux/random.h>
  20 #include <linux/v4l2-dv-timings.h>
  21 #include <asm/div64.h>
  22 #include <media/videobuf2-vmalloc.h>
  23 #include <media/v4l2-dv-timings.h>
  24 #include <media/v4l2-ioctl.h>
  25 #include <media/v4l2-fh.h>
  26 #include <media/v4l2-event.h>
  27
  28 #include "vivid-core.h"
  29 #include "vivid-vid-common.h"
  30 #include "vivid-vid-cap.h"
  31 #include "vivid-vid-out.h"
  32 #include "vivid-radio-common.h"
  33 #include "vivid-radio-rx.h"
  34 #include "vivid-radio-tx.h"
  35 #include "vivid-sdr-cap.h"
  36 #include "vivid-vbi-cap.h"
  37 #include "vivid-vbi-out.h"
  38 #include "vivid-osd.h"
  39 #include "vivid-ctrls.h"
  40 #include "vivid-kthread-out.h"
  41
  42 static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
  43 {
  44         struct vivid_buffer *vid_out_buf = NULL;
  45         struct vivid_buffer *vbi_out_buf = NULL;
  46
  47         dprintk(dev, 1, "Video Output Thread Tick\n");
  48
  49         /* Drop a certain percentage of buffers. */
  50         if (dev->perc_dropped_buffers &&
  51             prandom_u32_max(100) < dev->perc_dropped_buffers)
  52                 return;
  53
  54         spin_lock(&dev->slock);
  55         /*
  56          * Only dequeue buffer if there is at least one more pending.
  57          * This makes video loopback possible.
  58          */
  59         if (!list_empty(&dev->vid_out_active) &&
  60             !list_is_singular(&dev->vid_out_active)) {
  61                 vid_out_buf = list_entry(dev->vid_out_active.next,
  62                                          struct vivid_buffer, list);
  63                 list_del(&vid_out_buf->list);
  64         }
  65         if (!list_empty(&dev->vbi_out_active) &&
  66             (dev->field_out != V4L2_FIELD_ALTERNATE ||
  67              (dev->vbi_out_seq_count & 1))) {
  68                 vbi_out_buf = list_entry(dev->vbi_out_active.next,
  69                                          struct vivid_buffer, list);
  70                 list_del(&vbi_out_buf->list);
  71         }
  72         spin_unlock(&dev->slock);
  73
  74         if (!vid_out_buf && !vbi_out_buf)
  75                 return;
  76
  77         if (vid_out_buf) {
  78                 vid_out_buf->vb.sequence = dev->vid_out_seq_count;
  79                 if (dev->field_out == V4L2_FIELD_ALTERNATE) {
  80                         /*
  81                          * The sequence counter counts frames, not fields.
  82                          * So divide by two.
  83                          */
  84                         vid_out_buf->vb.sequence /= 2;
  85                 }
  86                 vid_out_buf->vb.vb2_buf.timestamp =
  87                         ktime_get_ns() + dev->time_wrap_offset;
  88                 vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
  89                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
  90                 dprintk(dev, 2, "vid_out buffer %d done\n",
  91                         vid_out_buf->vb.vb2_buf.index);
  92         }
  93
  94         if (vbi_out_buf) {
  95                 if (dev->stream_sliced_vbi_out)
  96                         vivid_sliced_vbi_out_process(dev, vbi_out_buf);
  97
  98                 vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
  99                 vbi_out_buf->vb.vb2_buf.timestamp =
 100                         ktime_get_ns() + dev->time_wrap_offset;
 101                 vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
 102                                 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 103                 dprintk(dev, 2, "vbi_out buffer %d done\n",
 104                         vbi_out_buf->vb.vb2_buf.index);
 105         }
 106         dev->dqbuf_error = false;
 107 }
 108
 109 static int vivid_thread_vid_out(void *data)
 110 {
 111         struct vivid_dev *dev = data;
 112         u64 numerators_since_start;
 113         u64 buffers_since_start;
 114         u64 next_jiffies_since_start;
 115         unsigned long jiffies_since_start;
 116         unsigned long cur_jiffies;
 117         unsigned wait_jiffies;
 118         unsigned numerator;
 119         unsigned denominator;
 120
 121         dprintk(dev, 1, "Video Output Thread Start\n");
 122
 123         set_freezable();
 124
 125         /* Resets frame counters */
 126         dev->out_seq_offset = 0;
 127         if (dev->seq_wrap)
 128                 dev->out_seq_count = 0xffffff80U;
 129         dev->jiffies_vid_out = jiffies;
 130         dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
 131         dev->out_seq_resync = false;
 132
 133         for (;;) {
 134                 try_to_freeze();
 135                 if (kthread_should_stop())
 136                         break;
 137
 138                 mutex_lock(&dev->mutex);
 139                 cur_jiffies = jiffies;
 140                 if (dev->out_seq_resync) {
 141                         dev->jiffies_vid_out = cur_jiffies;
 142                         dev->out_seq_offset = dev->out_seq_count + 1;
 143                         dev->out_seq_count = 0;
 144                         dev->out_seq_resync = false;
 145                 }
 146                 numerator = dev->timeperframe_vid_out.numerator;
 147                 denominator = dev->timeperframe_vid_out.denominator;
 148
 149                 if (dev->field_out == V4L2_FIELD_ALTERNATE)
 150                         denominator *= 2;
 151
 152                 /* Calculate the number of jiffies since we started streaming */
 153                 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
 154                 /* Get the number of buffers streamed since the start */
 155                 buffers_since_start = (u64)jiffies_since_start * denominator +
 156                                       (HZ * numerator) / 2;
 157                 do_div(buffers_since_start, HZ * numerator);
 158
 159                 /*
 160                  * After more than 0xf0000000 (rounded down to a multiple of
 161                  * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
 162                  * jiffies have passed since we started streaming reset the
 163                  * counters and keep track of the sequence offset.
 164                  */
 165                 if (jiffies_since_start > JIFFIES_RESYNC) {
 166                         dev->jiffies_vid_out = cur_jiffies;
 167                         dev->out_seq_offset = buffers_since_start;
 168                         buffers_since_start = 0;
 169                 }
 170                 dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
 171                 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
 172                 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
 173
 174                 vivid_thread_vid_out_tick(dev);
 175                 mutex_unlock(&dev->mutex);
 176
 177                 /*
 178                  * Calculate the number of 'numerators' streamed since we started,
 179                  * not including the current buffer.
 180                  */
 181                 numerators_since_start = buffers_since_start * numerator;
 182
 183                 /* And the number of jiffies since we started */
 184                 jiffies_since_start = jiffies - dev->jiffies_vid_out;
 185
 186                 /* Increase by the 'numerator' of one buffer */
 187                 numerators_since_start += numerator;
 188                 /*
 189                  * Calculate when that next buffer is supposed to start
 190                  * in jiffies since we started streaming.
 191                  */
 192                 next_jiffies_since_start = numerators_since_start * HZ +
 193                                            denominator / 2;
 194                 do_div(next_jiffies_since_start, denominator);
 195                 /* If it is in the past, then just schedule asap */
 196                 if (next_jiffies_since_start < jiffies_since_start)
 197                         next_jiffies_since_start = jiffies_since_start;
 198
 199                 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
 200                 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
 201         }
 202         dprintk(dev, 1, "Video Output Thread End\n");
 203         return 0;
 204 }
 205
 206 static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
 207 {
 208         v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
 209         v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
 210         v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
 211         v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
 212         v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
 213 }
 214
 215 int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
 216 {
 217         dprintk(dev, 1, "%s\n", __func__);
 218
 219         if (dev->kthread_vid_out) {
 220                 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
 221
 222                 if (pstreaming == &dev->vid_out_streaming)
 223                         dev->vid_out_seq_start = seq_count;
 224                 else
 225                         dev->vbi_out_seq_start = seq_count;
 226                 *pstreaming = true;
 227                 return 0;
 228         }
 229
 230         /* Resets frame counters */
 231         dev->jiffies_vid_out = jiffies;
 232         dev->vid_out_seq_start = dev->seq_wrap * 128;
 233         dev->vbi_out_seq_start = dev->seq_wrap * 128;
 234
 235         dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
 236                         "%s-vid-out", dev->v4l2_dev.name);
 237
 238         if (IS_ERR(dev->kthread_vid_out)) {
 239                 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
 240                 return PTR_ERR(dev->kthread_vid_out);
 241         }
 242         *pstreaming = true;
 243         vivid_grab_controls(dev, true);
 244
 245         dprintk(dev, 1, "returning from %s\n", __func__);
 246         return 0;
 247 }
 248
 249 void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
 250 {
 251         dprintk(dev, 1, "%s\n", __func__);
 252
 253         if (dev->kthread_vid_out == NULL)
 254                 return;
 255
 256         *pstreaming = false;
 257         if (pstreaming == &dev->vid_out_streaming) {
 258                 /* Release all active buffers */
 259                 while (!list_empty(&dev->vid_out_active)) {
 260                         struct vivid_buffer *buf;
 261
 262                         buf = list_entry(dev->vid_out_active.next,
 263                                          struct vivid_buffer, list);
 264                         list_del(&buf->list);
 265                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 266                         dprintk(dev, 2, "vid_out buffer %d done\n",
 267                                 buf->vb.vb2_buf.index);
 268                 }
 269         }
 270
 271         if (pstreaming == &dev->vbi_out_streaming) {
 272                 while (!list_empty(&dev->vbi_out_active)) {
 273                         struct vivid_buffer *buf;
 274
 275                         buf = list_entry(dev->vbi_out_active.next,
 276                                          struct vivid_buffer, list);
 277                         list_del(&buf->list);
 278                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 279                         dprintk(dev, 2, "vbi_out buffer %d done\n",
 280                                 buf->vb.vb2_buf.index);
 281                 }
 282         }
 283
 284         if (dev->vid_out_streaming || dev->vbi_out_streaming)
 285                 return;
 286
 287         /* shutdown control thread */
 288         vivid_grab_controls(dev, false);
 289         mutex_unlock(&dev->mutex);
 290         kthread_stop(dev->kthread_vid_out);
 291         dev->kthread_vid_out = NULL;
 292         mutex_lock(&dev->mutex);
 293 }