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
vivid_thread_vid_out_tick(struct vivid_dev * dev)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
vivid_thread_vid_out(void * data)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
vivid_grab_controls(struct vivid_dev * dev,bool grab)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
vivid_start_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)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
vivid_stop_generating_vid_out(struct vivid_dev * dev,bool * pstreaming)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 }
294
