| // 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; |
| |
| if (!mutex_trylock(&dev->mutex)) { |
| schedule_timeout_uninterruptible(1); |
| continue; |
| } |
| |
| 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)) { |
| int err = PTR_ERR(dev->kthread_vid_out); |
| |
| dev->kthread_vid_out = NULL; |
| v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n"); |
| return err; |
| } |
| *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); |
| kthread_stop(dev->kthread_vid_out); |
| dev->kthread_vid_out = NULL; |
| } |