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 <linux/jiffies.h>
22 #include <asm/div64.h>
23 #include <media/videobuf2-vmalloc.h>
24 #include <media/v4l2-dv-timings.h>
25 #include <media/v4l2-ioctl.h>
26 #include <media/v4l2-fh.h>
27 #include <media/v4l2-event.h>
28 
29 #include "vivid-core.h"
30 #include "vivid-vid-common.h"
31 #include "vivid-vid-cap.h"
32 #include "vivid-vid-out.h"
33 #include "vivid-radio-common.h"
34 #include "vivid-radio-rx.h"
35 #include "vivid-radio-tx.h"
36 #include "vivid-sdr-cap.h"
37 #include "vivid-vbi-cap.h"
38 #include "vivid-vbi-out.h"
39 #include "vivid-osd.h"
40 #include "vivid-ctrls.h"
41 #include "vivid-kthread-out.h"
42 #include "vivid-meta-out.h"
43 
44 static void vivid_thread_vid_out_tick(struct vivid_dev *dev)
45 {
46 	struct vivid_buffer *vid_out_buf = NULL;
47 	struct vivid_buffer *vbi_out_buf = NULL;
48 	struct vivid_buffer *meta_out_buf = NULL;
49 
50 	dprintk(dev, 1, "Video Output Thread Tick\n");
51 
52 	/* Drop a certain percentage of buffers. */
53 	if (dev->perc_dropped_buffers &&
54 	    get_random_u32_below(100) < dev->perc_dropped_buffers)
55 		return;
56 
57 	spin_lock(&dev->slock);
58 	/*
59 	 * Only dequeue buffer if there is at least one more pending.
60 	 * This makes video loopback possible.
61 	 */
62 	if (!list_empty(&dev->vid_out_active) &&
63 	    !list_is_singular(&dev->vid_out_active)) {
64 		vid_out_buf = list_entry(dev->vid_out_active.next,
65 					 struct vivid_buffer, list);
66 		list_del(&vid_out_buf->list);
67 	}
68 	if (!list_empty(&dev->vbi_out_active) &&
69 	    (dev->field_out != V4L2_FIELD_ALTERNATE ||
70 	     (dev->vbi_out_seq_count & 1))) {
71 		vbi_out_buf = list_entry(dev->vbi_out_active.next,
72 					 struct vivid_buffer, list);
73 		list_del(&vbi_out_buf->list);
74 	}
75 	if (!list_empty(&dev->meta_out_active)) {
76 		meta_out_buf = list_entry(dev->meta_out_active.next,
77 					  struct vivid_buffer, list);
78 		list_del(&meta_out_buf->list);
79 	}
80 	spin_unlock(&dev->slock);
81 
82 	if (!vid_out_buf && !vbi_out_buf && !meta_out_buf)
83 		return;
84 
85 	if (vid_out_buf) {
86 		v4l2_ctrl_request_setup(vid_out_buf->vb.vb2_buf.req_obj.req,
87 					&dev->ctrl_hdl_vid_out);
88 		v4l2_ctrl_request_complete(vid_out_buf->vb.vb2_buf.req_obj.req,
89 					   &dev->ctrl_hdl_vid_out);
90 		vid_out_buf->vb.sequence = dev->vid_out_seq_count;
91 		if (dev->field_out == V4L2_FIELD_ALTERNATE) {
92 			/*
93 			 * The sequence counter counts frames, not fields.
94 			 * So divide by two.
95 			 */
96 			vid_out_buf->vb.sequence /= 2;
97 		}
98 		vid_out_buf->vb.vb2_buf.timestamp =
99 			ktime_get_ns() + dev->time_wrap_offset;
100 		vb2_buffer_done(&vid_out_buf->vb.vb2_buf, dev->dqbuf_error ?
101 				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
102 		dprintk(dev, 2, "vid_out buffer %d done\n",
103 			vid_out_buf->vb.vb2_buf.index);
104 	}
105 
106 	if (vbi_out_buf) {
107 		v4l2_ctrl_request_setup(vbi_out_buf->vb.vb2_buf.req_obj.req,
108 					&dev->ctrl_hdl_vbi_out);
109 		v4l2_ctrl_request_complete(vbi_out_buf->vb.vb2_buf.req_obj.req,
110 					   &dev->ctrl_hdl_vbi_out);
111 		if (dev->stream_sliced_vbi_out)
112 			vivid_sliced_vbi_out_process(dev, vbi_out_buf);
113 
114 		vbi_out_buf->vb.sequence = dev->vbi_out_seq_count;
115 		vbi_out_buf->vb.vb2_buf.timestamp =
116 			ktime_get_ns() + dev->time_wrap_offset;
117 		vb2_buffer_done(&vbi_out_buf->vb.vb2_buf, dev->dqbuf_error ?
118 				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
119 		dprintk(dev, 2, "vbi_out buffer %d done\n",
120 			vbi_out_buf->vb.vb2_buf.index);
121 	}
122 	if (meta_out_buf) {
123 		v4l2_ctrl_request_setup(meta_out_buf->vb.vb2_buf.req_obj.req,
124 					&dev->ctrl_hdl_meta_out);
125 		v4l2_ctrl_request_complete(meta_out_buf->vb.vb2_buf.req_obj.req,
126 					   &dev->ctrl_hdl_meta_out);
127 		vivid_meta_out_process(dev, meta_out_buf);
128 		meta_out_buf->vb.sequence = dev->meta_out_seq_count;
129 		meta_out_buf->vb.vb2_buf.timestamp =
130 			ktime_get_ns() + dev->time_wrap_offset;
131 		vb2_buffer_done(&meta_out_buf->vb.vb2_buf, dev->dqbuf_error ?
132 				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
133 		dprintk(dev, 2, "meta_out buffer %d done\n",
134 			meta_out_buf->vb.vb2_buf.index);
135 	}
136 
137 	dev->dqbuf_error = false;
138 }
139 
140 static int vivid_thread_vid_out(void *data)
141 {
142 	struct vivid_dev *dev = data;
143 	u64 numerators_since_start;
144 	u64 buffers_since_start;
145 	u64 next_jiffies_since_start;
146 	unsigned long jiffies_since_start;
147 	unsigned long cur_jiffies;
148 	unsigned wait_jiffies;
149 	unsigned numerator;
150 	unsigned denominator;
151 
152 	dprintk(dev, 1, "Video Output Thread Start\n");
153 
154 	set_freezable();
155 
156 	/* Resets frame counters */
157 	dev->out_seq_offset = 0;
158 	dev->out_seq_count = 0;
159 	dev->jiffies_vid_out = jiffies;
160 	dev->out_seq_resync = false;
161 	if (dev->time_wrap)
162 		dev->time_wrap_offset = dev->time_wrap - ktime_get_ns();
163 	else
164 		dev->time_wrap_offset = 0;
165 
166 	for (;;) {
167 		try_to_freeze();
168 		if (kthread_should_stop())
169 			break;
170 
171 		if (!mutex_trylock(&dev->mutex)) {
172 			schedule();
173 			continue;
174 		}
175 
176 		cur_jiffies = jiffies;
177 		if (dev->out_seq_resync) {
178 			dev->jiffies_vid_out = cur_jiffies;
179 			dev->out_seq_offset = dev->out_seq_count + 1;
180 			dev->out_seq_count = 0;
181 			dev->out_seq_resync = false;
182 		}
183 		numerator = dev->timeperframe_vid_out.numerator;
184 		denominator = dev->timeperframe_vid_out.denominator;
185 
186 		if (dev->field_out == V4L2_FIELD_ALTERNATE)
187 			denominator *= 2;
188 
189 		/* Calculate the number of jiffies since we started streaming */
190 		jiffies_since_start = cur_jiffies - dev->jiffies_vid_out;
191 		/* Get the number of buffers streamed since the start */
192 		buffers_since_start = (u64)jiffies_since_start * denominator +
193 				      (HZ * numerator) / 2;
194 		do_div(buffers_since_start, HZ * numerator);
195 
196 		/*
197 		 * After more than 0xf0000000 (rounded down to a multiple of
198 		 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)
199 		 * jiffies have passed since we started streaming reset the
200 		 * counters and keep track of the sequence offset.
201 		 */
202 		if (jiffies_since_start > JIFFIES_RESYNC) {
203 			dev->jiffies_vid_out = cur_jiffies;
204 			dev->out_seq_offset = buffers_since_start;
205 			buffers_since_start = 0;
206 		}
207 		dev->out_seq_count = buffers_since_start + dev->out_seq_offset;
208 		dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start;
209 		dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start;
210 		dev->meta_out_seq_count = dev->out_seq_count - dev->meta_out_seq_start;
211 
212 		vivid_thread_vid_out_tick(dev);
213 		mutex_unlock(&dev->mutex);
214 
215 		/*
216 		 * Calculate the number of 'numerators' streamed since we started,
217 		 * not including the current buffer.
218 		 */
219 		numerators_since_start = buffers_since_start * numerator;
220 
221 		/* And the number of jiffies since we started */
222 		jiffies_since_start = jiffies - dev->jiffies_vid_out;
223 
224 		/* Increase by the 'numerator' of one buffer */
225 		numerators_since_start += numerator;
226 		/*
227 		 * Calculate when that next buffer is supposed to start
228 		 * in jiffies since we started streaming.
229 		 */
230 		next_jiffies_since_start = numerators_since_start * HZ +
231 					   denominator / 2;
232 		do_div(next_jiffies_since_start, denominator);
233 		/* If it is in the past, then just schedule asap */
234 		if (next_jiffies_since_start < jiffies_since_start)
235 			next_jiffies_since_start = jiffies_since_start;
236 
237 		wait_jiffies = next_jiffies_since_start - jiffies_since_start;
238 		while (time_is_after_jiffies(cur_jiffies + wait_jiffies) &&
239 		       !kthread_should_stop())
240 			schedule();
241 	}
242 	dprintk(dev, 1, "Video Output Thread End\n");
243 	return 0;
244 }
245 
246 static void vivid_grab_controls(struct vivid_dev *dev, bool grab)
247 {
248 	v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab);
249 	v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab);
250 	v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab);
251 	v4l2_ctrl_grab(dev->ctrl_tx_mode, grab);
252 	v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab);
253 }
254 
255 int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
256 {
257 	dprintk(dev, 1, "%s\n", __func__);
258 
259 	if (dev->kthread_vid_out) {
260 		u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128;
261 
262 		if (pstreaming == &dev->vid_out_streaming)
263 			dev->vid_out_seq_start = seq_count;
264 		else if (pstreaming == &dev->vbi_out_streaming)
265 			dev->vbi_out_seq_start = seq_count;
266 		else
267 			dev->meta_out_seq_start = seq_count;
268 		*pstreaming = true;
269 		return 0;
270 	}
271 
272 	/* Resets frame counters */
273 	dev->jiffies_vid_out = jiffies;
274 	dev->vid_out_seq_start = dev->seq_wrap * 128;
275 	dev->vbi_out_seq_start = dev->seq_wrap * 128;
276 	dev->meta_out_seq_start = dev->seq_wrap * 128;
277 
278 	dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev,
279 			"%s-vid-out", dev->v4l2_dev.name);
280 
281 	if (IS_ERR(dev->kthread_vid_out)) {
282 		int err = PTR_ERR(dev->kthread_vid_out);
283 
284 		dev->kthread_vid_out = NULL;
285 		v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
286 		return err;
287 	}
288 	*pstreaming = true;
289 	vivid_grab_controls(dev, true);
290 
291 	dprintk(dev, 1, "returning from %s\n", __func__);
292 	return 0;
293 }
294 
295 void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming)
296 {
297 	dprintk(dev, 1, "%s\n", __func__);
298 
299 	if (dev->kthread_vid_out == NULL)
300 		return;
301 
302 	*pstreaming = false;
303 	if (pstreaming == &dev->vid_out_streaming) {
304 		/* Release all active buffers */
305 		while (!list_empty(&dev->vid_out_active)) {
306 			struct vivid_buffer *buf;
307 
308 			buf = list_entry(dev->vid_out_active.next,
309 					 struct vivid_buffer, list);
310 			list_del(&buf->list);
311 			v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
312 						   &dev->ctrl_hdl_vid_out);
313 			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
314 			dprintk(dev, 2, "vid_out buffer %d done\n",
315 				buf->vb.vb2_buf.index);
316 		}
317 	}
318 
319 	if (pstreaming == &dev->vbi_out_streaming) {
320 		while (!list_empty(&dev->vbi_out_active)) {
321 			struct vivid_buffer *buf;
322 
323 			buf = list_entry(dev->vbi_out_active.next,
324 					 struct vivid_buffer, list);
325 			list_del(&buf->list);
326 			v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
327 						   &dev->ctrl_hdl_vbi_out);
328 			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
329 			dprintk(dev, 2, "vbi_out buffer %d done\n",
330 				buf->vb.vb2_buf.index);
331 		}
332 	}
333 
334 	if (pstreaming == &dev->meta_out_streaming) {
335 		while (!list_empty(&dev->meta_out_active)) {
336 			struct vivid_buffer *buf;
337 
338 			buf = list_entry(dev->meta_out_active.next,
339 					 struct vivid_buffer, list);
340 			list_del(&buf->list);
341 			v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,
342 						   &dev->ctrl_hdl_meta_out);
343 			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
344 			dprintk(dev, 2, "meta_out buffer %d done\n",
345 				buf->vb.vb2_buf.index);
346 		}
347 	}
348 
349 	if (dev->vid_out_streaming || dev->vbi_out_streaming ||
350 	    dev->meta_out_streaming)
351 		return;
352 
353 	/* shutdown control thread */
354 	vivid_grab_controls(dev, false);
355 	kthread_stop(dev->kthread_vid_out);
356 	dev->kthread_vid_out = NULL;
357 }
358