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// SPDX-License-Identifier: GPL-2.0-only
/*
* vivid-kthread-out.h - video/vbi output thread support functions.
*
* Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/font.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/random.h>
#include <linux/v4l2-dv-timings.h>
#include <asm/div64.h>
#include <media/videobuf2-vmalloc.h>
#include <media/v4l2-dv-timings.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include "vivid-core.h"
#include "vivid-vid-common.h"
#include "vivid-vid-cap.h"
#include "vivid-vid-out.h"
#include "vivid-radio-common.h"
#include "vivid-radio-rx.h"
#include "vivid-radio-tx.h"
#include "vivid-sdr-cap.h"
#include "vivid-vbi-cap.h"
#include "vivid-vbi-out.h"
#include "vivid-osd.h"
#include "vivid-ctrls.h"
#include "vivid-kthread-out.h"
static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
{
struct vivid_buffer *vid_out_buf = NULL;
struct vivid_buffer *vbi_out_buf = NULL;
dprintk(dev, 1, "Video Output Thread Tick\n");
/* Drop a certain percentage of buffers. */
if (dev->perc_dropped_buffers &&
prandom_u32_max(100) < dev->perc_dropped_buffers)
return;
spin_lock(&dev->slock);
/*
* Only dequeue buffer if there is at least one more pending.
* This makes video loopback possible.
*/
if (!list_empty(&dev->vid_out_active) &&
!list_is_singular(&dev->vid_out_active)) {
vid_out_buf = list_entry(dev->vid_out_active.next,
struct vivid_buffer, list);
list_del(&vid_out_buf->list);
}
if (!list_empty(&dev->vbi_out_active) &&
(dev->field_out != V4L2_FIELD_ALTERNATE ||
(dev->vbi_out_seq_count & 1))) {
vbi_out_buf = list_entry(dev->vbi_out_active.next,
struct vivid_buffer, list);
list_del(&vbi_out_buf->list);
}
spin_unlock(&dev->slock);
if (!vid_out_buf && !vbi_out_buf)
return;
if (vid_out_buf) {
vid_out_buf->vb.sequence = dev->vid_out_seq_count;
if (dev->field_out == V4L2_FIELD_ALTERNATE) {
/*
* The sequence counter counts frames, not fields.
* So divide by two.
*/
vid_out_buf->vb.sequence /= 2;
}
vid_out_buf->vb.vb2_buf.timestamp =
ktime_get_ns() + dev->time_wrap_offset;
vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
dprintk(dev, 2, "vid_out buffer %d done\n",
vid_out_buf->vb.vb2_buf.index);
}
if (vbi_out_buf) {
if (dev->stream_sliced_vbi_out)
vivid_sliced_vbi_out_process(dev, vbi_out_buf);
vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
vbi_out_buf->vb.vb2_buf.timestamp =
ktime_get_ns() + dev->time_wrap_offset;
vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
dprintk(dev, 2, "vbi_out buffer %d done\n",
vbi_out_buf->vb.vb2_buf.index);
}
dev->dqbuf_error = false;
}
static int vivid_thread_vid_out(void *data)
{
struct vivid_dev *dev = data;
u64 numerators_since_start;
u64 buffers_since_start;
u64 next_jiffies_since_start;
unsigned long jiffies_since_start;
unsigned long cur_jiffies;
unsigned wait_jiffies;
unsigned numerator;
unsigned denominator;
dprintk(dev, 1, "Video Output Thread Start\n");
set_freezable();
/* Resets frame counters */
dev->out_seq_offset = 0;
if (dev->seq_wrap)
dev->out_seq_count = 0xffffff80U;
dev->jiffies_vid_out = jiffies;
dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
dev->out_seq_resync = false;
for (;;) {
try_to_freeze();
if (kthread_should_stop())
break;
mutex_lock(&dev->mutex);
cur_jiffies = jiffies;
if (dev->out_seq_resync) {
dev->jiffies_vid_out = cur_jiffies;
dev->out_seq_offset = dev->out_seq_count + 1;
dev->out_seq_count = 0;
dev->out_seq_resync = false;
}
numerator = dev->timeperframe_vid_out.numerator;
denominator = dev->timeperframe_vid_out.denominator;
if (dev->field_out == V4L2_FIELD_ALTERNATE)
denominator *= 2;
/* Calculate the number of jiffies since we started streaming */
jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
/* Get the number of buffers streamed since the start */
buffers_since_start = (u64)jiffies_since_start * denominator +
(HZ * numerator) / 2;
do_div(buffers_since_start, HZ * numerator);
/*
* After more than 0xf0000000 (rounded down to a multiple of
* 'jiffies-per-day' to ease jiffies_to_msecs calculation)
* jiffies have passed since we started streaming reset the
* counters and keep track of the sequence offset.
*/
if (jiffies_since_start > JIFFIES_RESYNC) {
dev->jiffies_vid_out = cur_jiffies;
dev->out_seq_offset = buffers_since_start;
buffers_since_start = 0;
}
dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
vivid_thread_vid_out_tick(dev);
mutex_unlock(&dev->mutex);
/*
* Calculate the number of 'numerators' streamed since we started,
* not including the current buffer.
*/
numerators_since_start = buffers_since_start * numerator;
/* And the number of jiffies since we started */
jiffies_since_start = jiffies - dev->jiffies_vid_out;
/* Increase by the 'numerator' of one buffer */
numerators_since_start += numerator;
/*
* Calculate when that next buffer is supposed to start
* in jiffies since we started streaming.
*/
next_jiffies_since_start = numerators_since_start * HZ +
denominator / 2;
do_div(next_jiffies_since_start, denominator);
/* If it is in the past, then just schedule asap */
if (next_jiffies_since_start < jiffies_since_start)
next_jiffies_since_start = jiffies_since_start;
wait_jiffies = next_jiffies_since_start - jiffies_since_start;
schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
}
dprintk(dev, 1, "Video Output Thread End\n");
return 0;
}
static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
{
v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
}
int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
{
dprintk(dev, 1, "%s\n", __func__);
if (dev->kthread_vid_out) {
u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
if (pstreaming == &dev->vid_out_streaming)
dev->vid_out_seq_start = seq_count;
else
dev->vbi_out_seq_start = seq_count;
*pstreaming = true;
return 0;
}
/* Resets frame counters */
dev->jiffies_vid_out = jiffies;
dev->vid_out_seq_start = dev->seq_wrap * 128;
dev->vbi_out_seq_start = dev->seq_wrap * 128;
dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
"%s-vid-out", dev->v4l2_dev.name);
if (IS_ERR(dev->kthread_vid_out)) {
v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
return PTR_ERR(dev->kthread_vid_out);
}
*pstreaming = true;
vivid_grab_controls(dev, true);
dprintk(dev, 1, "returning from %s\n", __func__);
return 0;
}
void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
{
dprintk(dev, 1, "%s\n", __func__);
if (dev->kthread_vid_out == NULL)
return;
*pstreaming = false;
if (pstreaming == &dev->vid_out_streaming) {
/* Release all active buffers */
while (!list_empty(&dev->vid_out_active)) {
struct vivid_buffer *buf;
buf = list_entry(dev->vid_out_active.next,
struct vivid_buffer, list);
list_del(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
dprintk(dev, 2, "vid_out buffer %d done\n",
buf->vb.vb2_buf.index);
}
}
if (pstreaming == &dev->vbi_out_streaming) {
while (!list_empty(&dev->vbi_out_active)) {
struct vivid_buffer *buf;
buf = list_entry(dev->vbi_out_active.next,
struct vivid_buffer, list);
list_del(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
dprintk(dev, 2, "vbi_out buffer %d done\n",
buf->vb.vb2_buf.index);
}
}
if (dev->vid_out_streaming || dev->vbi_out_streaming)
return;
/* shutdown control thread */
vivid_grab_controls(dev, false);
mutex_unlock(&dev->mutex);
kthread_stop(dev->kthread_vid_out);
dev->kthread_vid_out = NULL;
mutex_lock(&dev->mutex);
}
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