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                 if (!mutex_trylock(&dev->mutex)) {
 139                         schedule_timeout_uninterruptible(1);
 140                         continue;
 141                 }
 142
 143                 cur_jiffies = jiffies;
 144                 if (dev->out_seq_resync) {
 145                         dev->jiffies_vid_out = cur_jiffies;
 146                         dev->out_seq_offset = dev->out_seq_count + 1;
 147                         dev->out_seq_count = 0;
 148                         dev->out_seq_resync = false;
 149                 }
 150                 numerator = dev->timeperframe_vid_out.numerator;
 151                 denominator = dev->timeperframe_vid_out.denominator;
 152
 153                 if (dev->field_out == V4L2_FIELD_ALTERNATE)
 154                         denominator *= 2;
 155
 156                 /* Calculate the number of jiffies since we started streaming */
 157                 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
 158                 /* Get the number of buffers streamed since the start */
 159                 buffers_since_start = (u64)jiffies_since_start * denominator +
 160                                       (HZ * numerator) / 2;
 161                 do_div(buffers_since_start, HZ * numerator);
 162
 163                 /*
 164                  * After more than 0xf0000000 (rounded down to a multiple of
 165                  * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
 166                  * jiffies have passed since we started streaming reset the
 167                  * counters and keep track of the sequence offset.
 168                  */
 169                 if (jiffies_since_start > JIFFIES_RESYNC) {
 170                         dev->jiffies_vid_out = cur_jiffies;
 171                         dev->out_seq_offset = buffers_since_start;
 172                         buffers_since_start = 0;
 173                 }
 174                 dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
 175                 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
 176                 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
 177
 178                 vivid_thread_vid_out_tick(dev);
 179                 mutex_unlock(&dev->mutex);
 180
 181                 /*
 182                  * Calculate the number of 'numerators' streamed since we started,
 183                  * not including the current buffer.
 184                  */
 185                 numerators_since_start = buffers_since_start * numerator;
 186
 187                 /* And the number of jiffies since we started */
 188                 jiffies_since_start = jiffies - dev->jiffies_vid_out;
 189
 190                 /* Increase by the 'numerator' of one buffer */
 191                 numerators_since_start += numerator;
 192                 /*
 193                  * Calculate when that next buffer is supposed to start
 194                  * in jiffies since we started streaming.
 195                  */
 196                 next_jiffies_since_start = numerators_since_start * HZ +
 197                                            denominator / 2;
 198                 do_div(next_jiffies_since_start, denominator);
 199                 /* If it is in the past, then just schedule asap */
 200                 if (next_jiffies_since_start < jiffies_since_start)
 201                         next_jiffies_since_start = jiffies_since_start;
 202
 203                 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
 204                 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
 205         }
 206         dprintk(dev, 1, "Video Output Thread End\n");
 207         return 0;
 208 }
 209
 210 static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
 211 {
 212         v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
 213         v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
 214         v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
 215         v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
 216         v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
 217 }
 218
 219 int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
 220 {
 221         dprintk(dev, 1, "%s\n", __func__);
 222
 223         if (dev->kthread_vid_out) {
 224                 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
 225
 226                 if (pstreaming == &dev->vid_out_streaming)
 227                         dev->vid_out_seq_start = seq_count;
 228                 else
 229                         dev->vbi_out_seq_start = seq_count;
 230                 *pstreaming = true;
 231                 return 0;
 232         }
 233
 234         /* Resets frame counters */
 235         dev->jiffies_vid_out = jiffies;
 236         dev->vid_out_seq_start = dev->seq_wrap * 128;
 237         dev->vbi_out_seq_start = dev->seq_wrap * 128;
 238
 239         dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
 240                         "%s-vid-out", dev->v4l2_dev.name);
 241
 242         if (IS_ERR(dev->kthread_vid_out)) {
 243                 int err = PTR_ERR(dev->kthread_vid_out);
 244
 245                 dev->kthread_vid_out = NULL;
 246                 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
 247                 return err;
 248         }
 249         *pstreaming = true;
 250         vivid_grab_controls(dev, true);
 251
 252         dprintk(dev, 1, "returning from %s\n", __func__);
 253         return 0;
 254 }
 255
 256 void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
 257 {
 258         dprintk(dev, 1, "%s\n", __func__);
 259
 260         if (dev->kthread_vid_out == NULL)
 261                 return;
 262
 263         *pstreaming = false;
 264         if (pstreaming == &dev->vid_out_streaming) {
 265                 /* Release all active buffers */
 266                 while (!list_empty(&dev->vid_out_active)) {
 267                         struct vivid_buffer *buf;
 268
 269                         buf = list_entry(dev->vid_out_active.next,
 270                                          struct vivid_buffer, list);
 271                         list_del(&buf->list);
 272                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 273                         dprintk(dev, 2, "vid_out buffer %d done\n",
 274                                 buf->vb.vb2_buf.index);
 275                 }
 276         }
 277
 278         if (pstreaming == &dev->vbi_out_streaming) {
 279                 while (!list_empty(&dev->vbi_out_active)) {
 280                         struct vivid_buffer *buf;
 281
 282                         buf = list_entry(dev->vbi_out_active.next,
 283                                          struct vivid_buffer, list);
 284                         list_del(&buf->list);
 285                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 286                         dprintk(dev, 2, "vbi_out buffer %d done\n",
 287                                 buf->vb.vb2_buf.index);
 288                 }
 289         }
 290
 291         if (dev->vid_out_streaming || dev->vbi_out_streaming)
 292                 return;
 293
 294         /* shutdown control thread */
 295         vivid_grab_controls(dev, false);
 296         kthread_stop(dev->kthread_vid_out);
 297         dev->kthread_vid_out = NULL;
 298 }