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3f682ffc HV |
1 | /* |
2 | * vivid-kthread-out.h - video/vbi output thread support functions. | |
3 | * | |
4 | * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved. | |
5 | * | |
6 | * This program is free software; you may redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; version 2 of the License. | |
9 | * | |
10 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
11 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
12 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
13 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
14 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
15 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
16 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
17 | * SOFTWARE. | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/font.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/videodev2.h> | |
29 | #include <linux/kthread.h> | |
30 | #include <linux/freezer.h> | |
31 | #include <linux/random.h> | |
32 | #include <linux/v4l2-dv-timings.h> | |
33 | #include <asm/div64.h> | |
34 | #include <media/videobuf2-vmalloc.h> | |
35 | #include <media/v4l2-dv-timings.h> | |
36 | #include <media/v4l2-ioctl.h> | |
37 | #include <media/v4l2-fh.h> | |
38 | #include <media/v4l2-event.h> | |
39 | ||
40 | #include "vivid-core.h" | |
41 | #include "vivid-vid-common.h" | |
42 | #include "vivid-vid-cap.h" | |
43 | #include "vivid-vid-out.h" | |
44 | #include "vivid-radio-common.h" | |
45 | #include "vivid-radio-rx.h" | |
46 | #include "vivid-radio-tx.h" | |
47 | #include "vivid-sdr-cap.h" | |
48 | #include "vivid-vbi-cap.h" | |
49 | #include "vivid-vbi-out.h" | |
50 | #include "vivid-osd.h" | |
51 | #include "vivid-ctrls.h" | |
96ec7d2a | 52 | #include "vivid-kthread-out.h" |
3f682ffc HV |
53 | |
54 | static void vivid_thread_vid_out_tick(struct vivid_dev *dev) | |
55 | { | |
56 | struct vivid_buffer *vid_out_buf = NULL; | |
57 | struct vivid_buffer *vbi_out_buf = NULL; | |
58 | ||
59 | dprintk(dev, 1, "Video Output Thread Tick\n"); | |
60 | ||
61 | /* Drop a certain percentage of buffers. */ | |
62 | if (dev->perc_dropped_buffers && | |
63 | prandom_u32_max(100) < dev->perc_dropped_buffers) | |
64 | return; | |
65 | ||
66 | spin_lock(&dev->slock); | |
67 | /* | |
68 | * Only dequeue buffer if there is at least one more pending. | |
69 | * This makes video loopback possible. | |
70 | */ | |
71 | if (!list_empty(&dev->vid_out_active) && | |
72 | !list_is_singular(&dev->vid_out_active)) { | |
73 | vid_out_buf = list_entry(dev->vid_out_active.next, | |
74 | struct vivid_buffer, list); | |
75 | list_del(&vid_out_buf->list); | |
76 | } | |
77 | if (!list_empty(&dev->vbi_out_active) && | |
78 | (dev->field_out != V4L2_FIELD_ALTERNATE || | |
79 | (dev->vbi_out_seq_count & 1))) { | |
80 | vbi_out_buf = list_entry(dev->vbi_out_active.next, | |
81 | struct vivid_buffer, list); | |
82 | list_del(&vbi_out_buf->list); | |
83 | } | |
84 | spin_unlock(&dev->slock); | |
85 | ||
86 | if (!vid_out_buf && !vbi_out_buf) | |
87 | return; | |
88 | ||
89 | if (vid_out_buf) { | |
2d700715 | 90 | vid_out_buf->vb.sequence = dev->vid_out_seq_count; |
3f682ffc HV |
91 | if (dev->field_out == V4L2_FIELD_ALTERNATE) { |
92 | /* | |
2d700715 JS |
93 | * The sequence counter counts frames, not fields. |
94 | * So divide by two. | |
3f682ffc | 95 | */ |
2d700715 | 96 | vid_out_buf->vb.sequence /= 2; |
3f682ffc | 97 | } |
d6dd645e JS |
98 | vid_out_buf->vb.vb2_buf.timestamp = |
99 | ktime_get_ns() + dev->time_wrap_offset; | |
2d700715 | 100 | vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ? |
3f682ffc HV |
101 | VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); |
102 | dprintk(dev, 2, "vid_out buffer %d done\n", | |
2d700715 | 103 | vid_out_buf->vb.vb2_buf.index); |
3f682ffc HV |
104 | } |
105 | ||
106 | if (vbi_out_buf) { | |
107 | if (dev->stream_sliced_vbi_out) | |
108 | vivid_sliced_vbi_out_process(dev, vbi_out_buf); | |
109 | ||
2d700715 | 110 | vbi_out_buf->vb.sequence = dev->vbi_out_seq_count; |
d6dd645e JS |
111 | vbi_out_buf->vb.vb2_buf.timestamp = |
112 | ktime_get_ns() + dev->time_wrap_offset; | |
2d700715 | 113 | vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ? |
3f682ffc HV |
114 | VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); |
115 | dprintk(dev, 2, "vbi_out buffer %d done\n", | |
2d700715 | 116 | vbi_out_buf->vb.vb2_buf.index); |
3f682ffc HV |
117 | } |
118 | dev->dqbuf_error = false; | |
119 | } | |
120 | ||
121 | static int vivid_thread_vid_out(void *data) | |
122 | { | |
123 | struct vivid_dev *dev = data; | |
124 | u64 numerators_since_start; | |
125 | u64 buffers_since_start; | |
126 | u64 next_jiffies_since_start; | |
127 | unsigned long jiffies_since_start; | |
128 | unsigned long cur_jiffies; | |
129 | unsigned wait_jiffies; | |
130 | unsigned numerator; | |
131 | unsigned denominator; | |
132 | ||
133 | dprintk(dev, 1, "Video Output Thread Start\n"); | |
134 | ||
135 | set_freezable(); | |
136 | ||
137 | /* Resets frame counters */ | |
138 | dev->out_seq_offset = 0; | |
139 | if (dev->seq_wrap) | |
140 | dev->out_seq_count = 0xffffff80U; | |
141 | dev->jiffies_vid_out = jiffies; | |
142 | dev->vid_out_seq_start = dev->vbi_out_seq_start = 0; | |
143 | dev->out_seq_resync = false; | |
144 | ||
145 | for (;;) { | |
146 | try_to_freeze(); | |
147 | if (kthread_should_stop()) | |
148 | break; | |
149 | ||
150 | mutex_lock(&dev->mutex); | |
151 | cur_jiffies = jiffies; | |
152 | if (dev->out_seq_resync) { | |
153 | dev->jiffies_vid_out = cur_jiffies; | |
154 | dev->out_seq_offset = dev->out_seq_count + 1; | |
155 | dev->out_seq_count = 0; | |
156 | dev->out_seq_resync = false; | |
157 | } | |
158 | numerator = dev->timeperframe_vid_out.numerator; | |
159 | denominator = dev->timeperframe_vid_out.denominator; | |
160 | ||
161 | if (dev->field_out == V4L2_FIELD_ALTERNATE) | |
162 | denominator *= 2; | |
163 | ||
164 | /* Calculate the number of jiffies since we started streaming */ | |
165 | jiffies_since_start = cur_jiffies - dev->jiffies_vid_out; | |
166 | /* Get the number of buffers streamed since the start */ | |
167 | buffers_since_start = (u64)jiffies_since_start * denominator + | |
168 | (HZ * numerator) / 2; | |
169 | do_div(buffers_since_start, HZ * numerator); | |
170 | ||
171 | /* | |
172 | * After more than 0xf0000000 (rounded down to a multiple of | |
173 | * 'jiffies-per-day' to ease jiffies_to_msecs calculation) | |
174 | * jiffies have passed since we started streaming reset the | |
175 | * counters and keep track of the sequence offset. | |
176 | */ | |
177 | if (jiffies_since_start > JIFFIES_RESYNC) { | |
178 | dev->jiffies_vid_out = cur_jiffies; | |
179 | dev->out_seq_offset = buffers_since_start; | |
180 | buffers_since_start = 0; | |
181 | } | |
182 | dev->out_seq_count = buffers_since_start + dev->out_seq_offset; | |
183 | dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start; | |
184 | dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start; | |
185 | ||
186 | vivid_thread_vid_out_tick(dev); | |
187 | mutex_unlock(&dev->mutex); | |
188 | ||
189 | /* | |
190 | * Calculate the number of 'numerators' streamed since we started, | |
191 | * not including the current buffer. | |
192 | */ | |
193 | numerators_since_start = buffers_since_start * numerator; | |
194 | ||
195 | /* And the number of jiffies since we started */ | |
196 | jiffies_since_start = jiffies - dev->jiffies_vid_out; | |
197 | ||
198 | /* Increase by the 'numerator' of one buffer */ | |
199 | numerators_since_start += numerator; | |
200 | /* | |
201 | * Calculate when that next buffer is supposed to start | |
202 | * in jiffies since we started streaming. | |
203 | */ | |
204 | next_jiffies_since_start = numerators_since_start * HZ + | |
205 | denominator / 2; | |
206 | do_div(next_jiffies_since_start, denominator); | |
207 | /* If it is in the past, then just schedule asap */ | |
208 | if (next_jiffies_since_start < jiffies_since_start) | |
209 | next_jiffies_since_start = jiffies_since_start; | |
210 | ||
211 | wait_jiffies = next_jiffies_since_start - jiffies_since_start; | |
212 | schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1); | |
213 | } | |
214 | dprintk(dev, 1, "Video Output Thread End\n"); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static void vivid_grab_controls(struct vivid_dev *dev, bool grab) | |
219 | { | |
220 | v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab); | |
221 | v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab); | |
222 | v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab); | |
223 | v4l2_ctrl_grab(dev->ctrl_tx_mode, grab); | |
224 | v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab); | |
225 | } | |
226 | ||
227 | int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming) | |
228 | { | |
229 | dprintk(dev, 1, "%s\n", __func__); | |
230 | ||
231 | if (dev->kthread_vid_out) { | |
232 | u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128; | |
233 | ||
234 | if (pstreaming == &dev->vid_out_streaming) | |
235 | dev->vid_out_seq_start = seq_count; | |
236 | else | |
237 | dev->vbi_out_seq_start = seq_count; | |
238 | *pstreaming = true; | |
239 | return 0; | |
240 | } | |
241 | ||
242 | /* Resets frame counters */ | |
243 | dev->jiffies_vid_out = jiffies; | |
244 | dev->vid_out_seq_start = dev->seq_wrap * 128; | |
245 | dev->vbi_out_seq_start = dev->seq_wrap * 128; | |
246 | ||
247 | dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev, | |
248 | "%s-vid-out", dev->v4l2_dev.name); | |
249 | ||
250 | if (IS_ERR(dev->kthread_vid_out)) { | |
251 | v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n"); | |
252 | return PTR_ERR(dev->kthread_vid_out); | |
253 | } | |
254 | *pstreaming = true; | |
255 | vivid_grab_controls(dev, true); | |
256 | ||
257 | dprintk(dev, 1, "returning from %s\n", __func__); | |
258 | return 0; | |
259 | } | |
260 | ||
261 | void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming) | |
262 | { | |
263 | dprintk(dev, 1, "%s\n", __func__); | |
264 | ||
265 | if (dev->kthread_vid_out == NULL) | |
266 | return; | |
267 | ||
268 | *pstreaming = false; | |
269 | if (pstreaming == &dev->vid_out_streaming) { | |
270 | /* Release all active buffers */ | |
271 | while (!list_empty(&dev->vid_out_active)) { | |
272 | struct vivid_buffer *buf; | |
273 | ||
274 | buf = list_entry(dev->vid_out_active.next, | |
275 | struct vivid_buffer, list); | |
276 | list_del(&buf->list); | |
2d700715 | 277 | vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); |
3f682ffc | 278 | dprintk(dev, 2, "vid_out buffer %d done\n", |
2d700715 | 279 | buf->vb.vb2_buf.index); |
3f682ffc HV |
280 | } |
281 | } | |
282 | ||
283 | if (pstreaming == &dev->vbi_out_streaming) { | |
284 | while (!list_empty(&dev->vbi_out_active)) { | |
285 | struct vivid_buffer *buf; | |
286 | ||
287 | buf = list_entry(dev->vbi_out_active.next, | |
288 | struct vivid_buffer, list); | |
289 | list_del(&buf->list); | |
2d700715 | 290 | vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); |
3f682ffc | 291 | dprintk(dev, 2, "vbi_out buffer %d done\n", |
2d700715 | 292 | buf->vb.vb2_buf.index); |
3f682ffc HV |
293 | } |
294 | } | |
295 | ||
296 | if (dev->vid_out_streaming || dev->vbi_out_streaming) | |
297 | return; | |
298 | ||
299 | /* shutdown control thread */ | |
300 | vivid_grab_controls(dev, false); | |
301 | mutex_unlock(&dev->mutex); | |
302 | kthread_stop(dev->kthread_vid_out); | |
303 | dev->kthread_vid_out = NULL; | |
304 | mutex_lock(&dev->mutex); | |
305 | } |