tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
42static 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 v4l2_ctrl_request_setup(vid_out_buf->vb.vb2_buf.req_obj.req,
79 &dev->ctrl_hdl_vid_out);
80 v4l2_ctrl_request_complete(vid_out_buf->vb.vb2_buf.req_obj.req,
81 &dev->ctrl_hdl_vid_out);
82 vid_out_buf->vb.sequence = dev->vid_out_seq_count;
83 if (dev->field_out == V4L2_FIELD_ALTERNATE) {
84 /*
85 * The sequence counter counts frames, not fields.
86 * So divide by two.
87 */
88 vid_out_buf->vb.sequence /= 2;
89 }
90 vid_out_buf->vb.vb2_buf.timestamp =
91 ktime_get_ns() + dev->time_wrap_offset;
92 vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
93 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
94 dprintk(dev, 2, "vid_out buffer %d done\n",
95 vid_out_buf->vb.vb2_buf.index);
96 }
97
98 if (vbi_out_buf) {
99 v4l2_ctrl_request_setup(vbi_out_buf->vb.vb2_buf.req_obj.req,
100 &dev->ctrl_hdl_vbi_out);
101 v4l2_ctrl_request_complete(vbi_out_buf->vb.vb2_buf.req_obj.req,
102 &dev->ctrl_hdl_vbi_out);
103 if (dev->stream_sliced_vbi_out)
104 vivid_sliced_vbi_out_process(dev, vbi_out_buf);
105
106 vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
107 vbi_out_buf->vb.vb2_buf.timestamp =
108 ktime_get_ns() + dev->time_wrap_offset;
109 vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
110 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
111 dprintk(dev, 2, "vbi_out buffer %d done\n",
112 vbi_out_buf->vb.vb2_buf.index);
113 }
114 dev->dqbuf_error = false;
115}
116
117static int vivid_thread_vid_out(void *data)
118{
119 struct vivid_dev *dev = data;
120 u64 numerators_since_start;
121 u64 buffers_since_start;
122 u64 next_jiffies_since_start;
123 unsigned long jiffies_since_start;
124 unsigned long cur_jiffies;
125 unsigned wait_jiffies;
126 unsigned numerator;
127 unsigned denominator;
128
129 dprintk(dev, 1, "Video Output Thread Start\n");
130
131 set_freezable();
132
133 /* Resets frame counters */
134 dev->out_seq_offset = 0;
135 if (dev->seq_wrap)
136 dev->out_seq_count = 0xffffff80U;
137 dev->jiffies_vid_out = jiffies;
138 dev->vid_out_seq_start = dev->vbi_out_seq_start = 0;
139 dev->out_seq_resync = false;
140
141 for (;;) {
142 try_to_freeze();
143 if (kthread_should_stop())
144 break;
145
146 mutex_lock(&dev->mutex);
147 cur_jiffies = jiffies;
148 if (dev->out_seq_resync) {
149 dev->jiffies_vid_out = cur_jiffies;
150 dev->out_seq_offset = dev->out_seq_count + 1;
151 dev->out_seq_count = 0;
152 dev->out_seq_resync = false;
153 }
154 numerator = dev->timeperframe_vid_out.numerator;
155 denominator = dev->timeperframe_vid_out.denominator;
156
157 if (dev->field_out == V4L2_FIELD_ALTERNATE)
158 denominator *= 2;
159
160 /* Calculate the number of jiffies since we started streaming */
161 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
162 /* Get the number of buffers streamed since the start */
163 buffers_since_start = (u64)jiffies_since_start * denominator +
164 (HZ * numerator) / 2;
165 do_div(buffers_since_start, HZ * numerator);
166
167 /*
168 * After more than 0xf0000000 (rounded down to a multiple of
169 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
170 * jiffies have passed since we started streaming reset the
171 * counters and keep track of the sequence offset.
172 */
173 if (jiffies_since_start > JIFFIES_RESYNC) {
174 dev->jiffies_vid_out = cur_jiffies;
175 dev->out_seq_offset = buffers_since_start;
176 buffers_since_start = 0;
177 }
178 dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
179 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
180 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
181
182 vivid_thread_vid_out_tick(dev);
183 mutex_unlock(&dev->mutex);
184
185 /*
186 * Calculate the number of 'numerators' streamed since we started,
187 * not including the current buffer.
188 */
189 numerators_since_start = buffers_since_start * numerator;
190
191 /* And the number of jiffies since we started */
192 jiffies_since_start = jiffies - dev->jiffies_vid_out;
193
194 /* Increase by the 'numerator' of one buffer */
195 numerators_since_start += numerator;
196 /*
197 * Calculate when that next buffer is supposed to start
198 * in jiffies since we started streaming.
199 */
200 next_jiffies_since_start = numerators_since_start * HZ +
201 denominator / 2;
202 do_div(next_jiffies_since_start, denominator);
203 /* If it is in the past, then just schedule asap */
204 if (next_jiffies_since_start < jiffies_since_start)
205 next_jiffies_since_start = jiffies_since_start;
206
207 wait_jiffies = next_jiffies_since_start - jiffies_since_start;
208 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);
209 }
210 dprintk(dev, 1, "Video Output Thread End\n");
211 return 0;
212}
213
214static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
215{
216 v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
217 v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
218 v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
219 v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
220 v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
221}
222
223int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
224{
225 dprintk(dev, 1, "%s\n", __func__);
226
227 if (dev->kthread_vid_out) {
228 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
229
230 if (pstreaming == &dev->vid_out_streaming)
231 dev->vid_out_seq_start = seq_count;
232 else
233 dev->vbi_out_seq_start = seq_count;
234 *pstreaming = true;
235 return 0;
236 }
237
238 /* Resets frame counters */
239 dev->jiffies_vid_out = jiffies;
240 dev->vid_out_seq_start = dev->seq_wrap * 128;
241 dev->vbi_out_seq_start = dev->seq_wrap * 128;
242
243 dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
244 "%s-vid-out", dev->v4l2_dev.name);
245
246 if (IS_ERR(dev->kthread_vid_out)) {
247 int err = PTR_ERR(dev->kthread_vid_out);
248
249 dev->kthread_vid_out = NULL;
250 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
251 return err;
252 }
253 *pstreaming = true;
254 vivid_grab_controls(dev, true);
255
256 dprintk(dev, 1, "returning from %s\n", __func__);
257 return 0;
258}
259
260void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
261{
262 dprintk(dev, 1, "%s\n", __func__);
263
264 if (dev->kthread_vid_out == NULL)
265 return;
266
267 *pstreaming = false;
268 if (pstreaming == &dev->vid_out_streaming) {
269 /* Release all active buffers */
270 while (!list_empty(&dev->vid_out_active)) {
271 struct vivid_buffer *buf;
272
273 buf = list_entry(dev->vid_out_active.next,
274 struct vivid_buffer, list);
275 list_del(&buf->list);
276 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
277 &dev->ctrl_hdl_vid_out);
278 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
279 dprintk(dev, 2, "vid_out buffer %d done\n",
280 buf->vb.vb2_buf.index);
281 }
282 }
283
284 if (pstreaming == &dev->vbi_out_streaming) {
285 while (!list_empty(&dev->vbi_out_active)) {
286 struct vivid_buffer *buf;
287
288 buf = list_entry(dev->vbi_out_active.next,
289 struct vivid_buffer, list);
290 list_del(&buf->list);
291 v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
292 &dev->ctrl_hdl_vbi_out);
293 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
294 dprintk(dev, 2, "vbi_out buffer %d done\n",
295 buf->vb.vb2_buf.index);
296 }
297 }
298
299 if (dev->vid_out_streaming || dev->vbi_out_streaming)
300 return;
301
302 /* shutdown control thread */
303 vivid_grab_controls(dev, false);
304 mutex_unlock(&dev->mutex);
305 kthread_stop(dev->kthread_vid_out);
306 dev->kthread_vid_out = NULL;
307 mutex_lock(&dev->mutex);
308}