1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ISI V4L2 memory to memory driver for i.MX8QXP/QM platform
4 *
5 * ISI is a Image Sensor Interface of i.MX8QXP/QM platform, which
6 * used to process image from camera sensor or memory to memory or DC
7 *
8 * Copyright (c) 2019 NXP Semiconductor
9 */
10
11 #include <linux/container_of.h>
12 #include <linux/device.h>
13 #include <linux/errno.h>
14 #include <linux/kernel.h>
15 #include <linux/limits.h>
16 #include <linux/minmax.h>
17 #include <linux/mutex.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/slab.h>
20 #include <linux/spinlock.h>
21 #include <linux/string.h>
22 #include <linux/types.h>
23 #include <linux/videodev2.h>
24
25 #include <media/media-entity.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-device.h>
28 #include <media/v4l2-event.h>
29 #include <media/v4l2-fh.h>
30 #include <media/v4l2-ioctl.h>
31 #include <media/v4l2-mem2mem.h>
32 #include <media/videobuf2-core.h>
33 #include <media/videobuf2-dma-contig.h>
34
35 #include "imx8-isi-core.h"
36
37 struct mxc_isi_m2m_buffer {
38 struct v4l2_m2m_buffer buf;
39 dma_addr_t dma_addrs[3];
40 };
41
42 struct mxc_isi_m2m_ctx_queue_data {
43 struct v4l2_pix_format_mplane format;
44 const struct mxc_isi_format_info *info;
45 u32 sequence;
46 };
47
48 struct mxc_isi_m2m_ctx {
49 struct v4l2_fh fh;
50 struct mxc_isi_m2m *m2m;
51
52 /* Protects the m2m vb2 queues */
53 struct mutex vb2_lock;
54
55 struct {
56 struct mxc_isi_m2m_ctx_queue_data out;
57 struct mxc_isi_m2m_ctx_queue_data cap;
58 } queues;
59
60 struct {
61 struct v4l2_ctrl_handler handler;
62 unsigned int alpha;
63 bool hflip;
64 bool vflip;
65 } ctrls;
66
67 bool chained;
68 };
69
70 static inline struct mxc_isi_m2m_buffer *
to_isi_m2m_buffer(struct vb2_v4l2_buffer * buf)71 to_isi_m2m_buffer(struct vb2_v4l2_buffer *buf)
72 {
73 return container_of(buf, struct mxc_isi_m2m_buffer, buf.vb);
74 }
75
to_isi_m2m_ctx(struct v4l2_fh * fh)76 static inline struct mxc_isi_m2m_ctx *to_isi_m2m_ctx(struct v4l2_fh *fh)
77 {
78 return container_of(fh, struct mxc_isi_m2m_ctx, fh);
79 }
80
81 static inline struct mxc_isi_m2m_ctx_queue_data *
mxc_isi_m2m_ctx_qdata(struct mxc_isi_m2m_ctx * ctx,enum v4l2_buf_type type)82 mxc_isi_m2m_ctx_qdata(struct mxc_isi_m2m_ctx *ctx, enum v4l2_buf_type type)
83 {
84 if (V4L2_TYPE_IS_OUTPUT(type))
85 return &ctx->queues.out;
86 else
87 return &ctx->queues.cap;
88 }
89
90 /* -----------------------------------------------------------------------------
91 * V4L2 M2M device operations
92 */
93
mxc_isi_m2m_frame_write_done(struct mxc_isi_pipe * pipe,u32 status)94 static void mxc_isi_m2m_frame_write_done(struct mxc_isi_pipe *pipe, u32 status)
95 {
96 struct mxc_isi_m2m *m2m = &pipe->isi->m2m;
97 struct vb2_v4l2_buffer *src_vbuf, *dst_vbuf;
98 struct mxc_isi_m2m_ctx *ctx;
99
100 ctx = v4l2_m2m_get_curr_priv(m2m->m2m_dev);
101 if (!ctx) {
102 dev_err(m2m->isi->dev,
103 "Instance released before the end of transaction\n");
104 return;
105 }
106
107 src_vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
108 dst_vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
109
110 v4l2_m2m_buf_copy_metadata(src_vbuf, dst_vbuf, false);
111
112 src_vbuf->sequence = ctx->queues.out.sequence++;
113 dst_vbuf->sequence = ctx->queues.cap.sequence++;
114
115 v4l2_m2m_buf_done(src_vbuf, VB2_BUF_STATE_DONE);
116 v4l2_m2m_buf_done(dst_vbuf, VB2_BUF_STATE_DONE);
117
118 v4l2_m2m_job_finish(m2m->m2m_dev, ctx->fh.m2m_ctx);
119 }
120
mxc_isi_m2m_device_run(void * priv)121 static void mxc_isi_m2m_device_run(void *priv)
122 {
123 struct mxc_isi_m2m_ctx *ctx = priv;
124 struct mxc_isi_m2m *m2m = ctx->m2m;
125 struct vb2_v4l2_buffer *src_vbuf, *dst_vbuf;
126 struct mxc_isi_m2m_buffer *src_buf, *dst_buf;
127
128 mxc_isi_channel_disable(m2m->pipe);
129
130 mutex_lock(&m2m->lock);
131
132 /* If the context has changed, reconfigure the channel. */
133 if (m2m->last_ctx != ctx) {
134 const struct v4l2_area in_size = {
135 .width = ctx->queues.out.format.width,
136 .height = ctx->queues.out.format.height,
137 };
138 const struct v4l2_area scale = {
139 .width = ctx->queues.cap.format.width,
140 .height = ctx->queues.cap.format.height,
141 };
142 const struct v4l2_rect crop = {
143 .width = ctx->queues.cap.format.width,
144 .height = ctx->queues.cap.format.height,
145 };
146
147 mxc_isi_channel_config(m2m->pipe, MXC_ISI_INPUT_MEM,
148 &in_size, &scale, &crop,
149 ctx->queues.out.info->encoding,
150 ctx->queues.cap.info->encoding);
151 mxc_isi_channel_set_input_format(m2m->pipe,
152 ctx->queues.out.info,
153 &ctx->queues.out.format);
154 mxc_isi_channel_set_output_format(m2m->pipe,
155 ctx->queues.cap.info,
156 &ctx->queues.cap.format);
157
158 m2m->last_ctx = ctx;
159 }
160
161 mutex_unlock(&m2m->lock);
162
163 mutex_lock(ctx->ctrls.handler.lock);
164 mxc_isi_channel_set_alpha(m2m->pipe, ctx->ctrls.alpha);
165 mxc_isi_channel_set_flip(m2m->pipe, ctx->ctrls.hflip, ctx->ctrls.vflip);
166 mutex_unlock(ctx->ctrls.handler.lock);
167
168 src_vbuf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
169 dst_vbuf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
170
171 src_buf = to_isi_m2m_buffer(src_vbuf);
172 dst_buf = to_isi_m2m_buffer(dst_vbuf);
173
174 mxc_isi_channel_set_inbuf(m2m->pipe, src_buf->dma_addrs[0]);
175 mxc_isi_channel_set_outbuf(m2m->pipe, dst_buf->dma_addrs, MXC_ISI_BUF1);
176 mxc_isi_channel_set_outbuf(m2m->pipe, dst_buf->dma_addrs, MXC_ISI_BUF2);
177
178 mxc_isi_channel_enable(m2m->pipe);
179
180 mxc_isi_channel_m2m_start(m2m->pipe);
181 }
182
183 static const struct v4l2_m2m_ops mxc_isi_m2m_ops = {
184 .device_run = mxc_isi_m2m_device_run,
185 };
186
187 /* -----------------------------------------------------------------------------
188 * videobuf2 queue operations
189 */
190
mxc_isi_m2m_vb2_queue_setup(struct vb2_queue * q,unsigned int * num_buffers,unsigned int * num_planes,unsigned int sizes[],struct device * alloc_devs[])191 static int mxc_isi_m2m_vb2_queue_setup(struct vb2_queue *q,
192 unsigned int *num_buffers,
193 unsigned int *num_planes,
194 unsigned int sizes[],
195 struct device *alloc_devs[])
196 {
197 struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(q);
198 const struct mxc_isi_m2m_ctx_queue_data *qdata =
199 mxc_isi_m2m_ctx_qdata(ctx, q->type);
200
201 return mxc_isi_video_queue_setup(&qdata->format, qdata->info,
202 num_buffers, num_planes, sizes);
203 }
204
mxc_isi_m2m_vb2_buffer_init(struct vb2_buffer * vb2)205 static int mxc_isi_m2m_vb2_buffer_init(struct vb2_buffer *vb2)
206 {
207 struct vb2_queue *vq = vb2->vb2_queue;
208 struct mxc_isi_m2m_buffer *buf = to_isi_m2m_buffer(to_vb2_v4l2_buffer(vb2));
209 struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(vb2->vb2_queue);
210 const struct mxc_isi_m2m_ctx_queue_data *qdata =
211 mxc_isi_m2m_ctx_qdata(ctx, vq->type);
212
213 mxc_isi_video_buffer_init(vb2, buf->dma_addrs, qdata->info,
214 &qdata->format);
215
216 return 0;
217 }
218
mxc_isi_m2m_vb2_buffer_prepare(struct vb2_buffer * vb2)219 static int mxc_isi_m2m_vb2_buffer_prepare(struct vb2_buffer *vb2)
220 {
221 struct vb2_queue *vq = vb2->vb2_queue;
222 struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(vq);
223 const struct mxc_isi_m2m_ctx_queue_data *qdata =
224 mxc_isi_m2m_ctx_qdata(ctx, vq->type);
225
226 return mxc_isi_video_buffer_prepare(ctx->m2m->isi, vb2, qdata->info,
227 &qdata->format);
228 }
229
mxc_isi_m2m_vb2_buffer_queue(struct vb2_buffer * vb2)230 static void mxc_isi_m2m_vb2_buffer_queue(struct vb2_buffer *vb2)
231 {
232 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
233 struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(vb2->vb2_queue);
234
235 v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
236 }
237
mxc_isi_m2m_vb2_start_streaming(struct vb2_queue * q,unsigned int count)238 static int mxc_isi_m2m_vb2_start_streaming(struct vb2_queue *q,
239 unsigned int count)
240 {
241 struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(q);
242 struct mxc_isi_m2m_ctx_queue_data *qdata =
243 mxc_isi_m2m_ctx_qdata(ctx, q->type);
244
245 qdata->sequence = 0;
246
247 return 0;
248 }
249
mxc_isi_m2m_vb2_stop_streaming(struct vb2_queue * q)250 static void mxc_isi_m2m_vb2_stop_streaming(struct vb2_queue *q)
251 {
252 struct mxc_isi_m2m_ctx *ctx = vb2_get_drv_priv(q);
253 struct vb2_v4l2_buffer *vbuf;
254
255 for (;;) {
256 if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
257 vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
258 else
259 vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
260 if (!vbuf)
261 break;
262
263 v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
264 }
265 }
266
267 static const struct vb2_ops mxc_isi_m2m_vb2_qops = {
268 .queue_setup = mxc_isi_m2m_vb2_queue_setup,
269 .buf_init = mxc_isi_m2m_vb2_buffer_init,
270 .buf_prepare = mxc_isi_m2m_vb2_buffer_prepare,
271 .buf_queue = mxc_isi_m2m_vb2_buffer_queue,
272 .start_streaming = mxc_isi_m2m_vb2_start_streaming,
273 .stop_streaming = mxc_isi_m2m_vb2_stop_streaming,
274 };
275
mxc_isi_m2m_queue_init(void * priv,struct vb2_queue * src_vq,struct vb2_queue * dst_vq)276 static int mxc_isi_m2m_queue_init(void *priv, struct vb2_queue *src_vq,
277 struct vb2_queue *dst_vq)
278 {
279 struct mxc_isi_m2m_ctx *ctx = priv;
280 struct mxc_isi_m2m *m2m = ctx->m2m;
281 int ret;
282
283 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
284 src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
285 src_vq->drv_priv = ctx;
286 src_vq->buf_struct_size = sizeof(struct mxc_isi_m2m_buffer);
287 src_vq->ops = &mxc_isi_m2m_vb2_qops;
288 src_vq->mem_ops = &vb2_dma_contig_memops;
289 src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
290 src_vq->lock = &ctx->vb2_lock;
291 src_vq->dev = m2m->isi->dev;
292
293 ret = vb2_queue_init(src_vq);
294 if (ret)
295 return ret;
296
297 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
298 dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
299 dst_vq->drv_priv = ctx;
300 dst_vq->buf_struct_size = sizeof(struct mxc_isi_m2m_buffer);
301 dst_vq->ops = &mxc_isi_m2m_vb2_qops;
302 dst_vq->mem_ops = &vb2_dma_contig_memops;
303 dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
304 dst_vq->lock = &ctx->vb2_lock;
305 dst_vq->dev = m2m->isi->dev;
306
307 return vb2_queue_init(dst_vq);
308 }
309
310 /* -----------------------------------------------------------------------------
311 * V4L2 controls
312 */
313
314 static inline struct mxc_isi_m2m_ctx *
ctrl_to_mxc_isi_m2m_ctx(struct v4l2_ctrl * ctrl)315 ctrl_to_mxc_isi_m2m_ctx(struct v4l2_ctrl *ctrl)
316 {
317 return container_of(ctrl->handler, struct mxc_isi_m2m_ctx, ctrls.handler);
318 }
319
mxc_isi_m2m_ctx_s_ctrl(struct v4l2_ctrl * ctrl)320 static int mxc_isi_m2m_ctx_s_ctrl(struct v4l2_ctrl *ctrl)
321 {
322 struct mxc_isi_m2m_ctx *ctx = ctrl_to_mxc_isi_m2m_ctx(ctrl);
323
324 switch (ctrl->id) {
325 case V4L2_CID_HFLIP:
326 ctx->ctrls.hflip = ctrl->val;
327 break;
328
329 case V4L2_CID_VFLIP:
330 ctx->ctrls.vflip = ctrl->val;
331 break;
332
333 case V4L2_CID_ALPHA_COMPONENT:
334 ctx->ctrls.alpha = ctrl->val;
335 break;
336 }
337
338 return 0;
339 }
340
341 static const struct v4l2_ctrl_ops mxc_isi_m2m_ctx_ctrl_ops = {
342 .s_ctrl = mxc_isi_m2m_ctx_s_ctrl,
343 };
344
mxc_isi_m2m_ctx_ctrls_create(struct mxc_isi_m2m_ctx * ctx)345 static int mxc_isi_m2m_ctx_ctrls_create(struct mxc_isi_m2m_ctx *ctx)
346 {
347 struct v4l2_ctrl_handler *handler = &ctx->ctrls.handler;
348 int ret;
349
350 v4l2_ctrl_handler_init(handler, 3);
351
352 v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops,
353 V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 0);
354 v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops,
355 V4L2_CID_HFLIP, 0, 1, 1, 0);
356 v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops,
357 V4L2_CID_VFLIP, 0, 1, 1, 0);
358
359 if (handler->error) {
360 ret = handler->error;
361 v4l2_ctrl_handler_free(handler);
362 return ret;
363 }
364
365 ctx->fh.ctrl_handler = handler;
366
367 return 0;
368 }
369
mxc_isi_m2m_ctx_ctrls_delete(struct mxc_isi_m2m_ctx * ctx)370 static void mxc_isi_m2m_ctx_ctrls_delete(struct mxc_isi_m2m_ctx *ctx)
371 {
372 v4l2_ctrl_handler_free(&ctx->ctrls.handler);
373 }
374
375 /* -----------------------------------------------------------------------------
376 * V4L2 ioctls
377 */
378
mxc_isi_m2m_querycap(struct file * file,void * fh,struct v4l2_capability * cap)379 static int mxc_isi_m2m_querycap(struct file *file, void *fh,
380 struct v4l2_capability *cap)
381 {
382 strscpy(cap->driver, MXC_ISI_DRIVER_NAME, sizeof(cap->driver));
383 strscpy(cap->card, MXC_ISI_M2M, sizeof(cap->card));
384 cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
385 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
386
387 return 0;
388 }
389
mxc_isi_m2m_enum_fmt_vid(struct file * file,void * fh,struct v4l2_fmtdesc * f)390 static int mxc_isi_m2m_enum_fmt_vid(struct file *file, void *fh,
391 struct v4l2_fmtdesc *f)
392 {
393 const enum mxc_isi_video_type type =
394 f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ?
395 MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP;
396 const struct mxc_isi_format_info *info;
397
398 info = mxc_isi_format_enum(f->index, type);
399 if (!info)
400 return -EINVAL;
401
402 f->pixelformat = info->fourcc;
403 f->flags |= V4L2_FMT_FLAG_CSC_COLORSPACE | V4L2_FMT_FLAG_CSC_YCBCR_ENC
404 | V4L2_FMT_FLAG_CSC_QUANTIZATION | V4L2_FMT_FLAG_CSC_XFER_FUNC;
405
406 return 0;
407 }
408
409 static const struct mxc_isi_format_info *
__mxc_isi_m2m_try_fmt_vid(struct mxc_isi_m2m_ctx * ctx,struct v4l2_pix_format_mplane * pix,const enum mxc_isi_video_type type)410 __mxc_isi_m2m_try_fmt_vid(struct mxc_isi_m2m_ctx *ctx,
411 struct v4l2_pix_format_mplane *pix,
412 const enum mxc_isi_video_type type)
413 {
414 if (type == MXC_ISI_VIDEO_M2M_CAP) {
415 /* Downscaling only */
416 pix->width = min(pix->width, ctx->queues.out.format.width);
417 pix->height = min(pix->height, ctx->queues.out.format.height);
418 }
419
420 return mxc_isi_format_try(ctx->m2m->pipe, pix, type);
421 }
422
mxc_isi_m2m_try_fmt_vid(struct file * file,void * fh,struct v4l2_format * f)423 static int mxc_isi_m2m_try_fmt_vid(struct file *file, void *fh,
424 struct v4l2_format *f)
425 {
426 const enum mxc_isi_video_type type =
427 f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ?
428 MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP;
429 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
430
431 __mxc_isi_m2m_try_fmt_vid(ctx, &f->fmt.pix_mp, type);
432
433 return 0;
434 }
435
mxc_isi_m2m_g_fmt_vid(struct file * file,void * fh,struct v4l2_format * f)436 static int mxc_isi_m2m_g_fmt_vid(struct file *file, void *fh,
437 struct v4l2_format *f)
438 {
439 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
440 const struct mxc_isi_m2m_ctx_queue_data *qdata =
441 mxc_isi_m2m_ctx_qdata(ctx, f->type);
442
443 f->fmt.pix_mp = qdata->format;
444
445 return 0;
446 }
447
mxc_isi_m2m_s_fmt_vid(struct file * file,void * fh,struct v4l2_format * f)448 static int mxc_isi_m2m_s_fmt_vid(struct file *file, void *fh,
449 struct v4l2_format *f)
450 {
451 const enum mxc_isi_video_type type =
452 f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ?
453 MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP;
454 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
455 struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp;
456 const struct mxc_isi_format_info *info;
457 struct vb2_queue *vq;
458
459 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
460 if (!vq)
461 return -EINVAL;
462
463 if (vb2_is_busy(vq))
464 return -EBUSY;
465
466 info = __mxc_isi_m2m_try_fmt_vid(ctx, pix, type);
467
468 if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
469 ctx->queues.out.format = *pix;
470 ctx->queues.out.info = info;
471 }
472
473 /*
474 * Always set the format on the capture side, due to either format
475 * propagation or direct setting.
476 */
477 ctx->queues.cap.format = *pix;
478 ctx->queues.cap.info = info;
479
480 return 0;
481 }
482
mxc_isi_m2m_streamon(struct file * file,void * fh,enum v4l2_buf_type type)483 static int mxc_isi_m2m_streamon(struct file *file, void *fh,
484 enum v4l2_buf_type type)
485 {
486 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
487 const struct v4l2_pix_format_mplane *out_pix = &ctx->queues.out.format;
488 const struct v4l2_pix_format_mplane *cap_pix = &ctx->queues.cap.format;
489 const struct mxc_isi_format_info *cap_info = ctx->queues.cap.info;
490 const struct mxc_isi_format_info *out_info = ctx->queues.out.info;
491 struct mxc_isi_m2m *m2m = ctx->m2m;
492 bool bypass;
493
494 int ret;
495
496 mutex_lock(&m2m->lock);
497
498 if (m2m->usage_count == INT_MAX) {
499 ret = -EOVERFLOW;
500 goto unlock;
501 }
502
503 bypass = cap_pix->width == out_pix->width &&
504 cap_pix->height == out_pix->height &&
505 cap_info->encoding == out_info->encoding;
506
507 /*
508 * Acquire the pipe and initialize the channel with the first user of
509 * the M2M device.
510 */
511 if (m2m->usage_count == 0) {
512 ret = mxc_isi_channel_acquire(m2m->pipe,
513 &mxc_isi_m2m_frame_write_done,
514 bypass);
515 if (ret)
516 goto unlock;
517
518 mxc_isi_channel_get(m2m->pipe);
519 }
520
521 m2m->usage_count++;
522
523 /*
524 * Allocate resources for the channel, counting how many users require
525 * buffer chaining.
526 */
527 if (!ctx->chained && out_pix->width > MXC_ISI_MAX_WIDTH_UNCHAINED) {
528 ret = mxc_isi_channel_chain(m2m->pipe, bypass);
529 if (ret)
530 goto deinit;
531
532 m2m->chained_count++;
533 ctx->chained = true;
534 }
535
536 /*
537 * Drop the lock to start the stream, as the .device_run() operation
538 * needs to acquire it.
539 */
540 mutex_unlock(&m2m->lock);
541 ret = v4l2_m2m_ioctl_streamon(file, fh, type);
542 if (ret) {
543 /* Reacquire the lock for the cleanup path. */
544 mutex_lock(&m2m->lock);
545 goto unchain;
546 }
547
548 return 0;
549
550 unchain:
551 if (ctx->chained && --m2m->chained_count == 0)
552 mxc_isi_channel_unchain(m2m->pipe);
553 ctx->chained = false;
554
555 deinit:
556 if (--m2m->usage_count == 0) {
557 mxc_isi_channel_put(m2m->pipe);
558 mxc_isi_channel_release(m2m->pipe);
559 }
560
561 unlock:
562 mutex_unlock(&m2m->lock);
563 return ret;
564 }
565
mxc_isi_m2m_streamoff(struct file * file,void * fh,enum v4l2_buf_type type)566 static int mxc_isi_m2m_streamoff(struct file *file, void *fh,
567 enum v4l2_buf_type type)
568 {
569 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
570 struct mxc_isi_m2m *m2m = ctx->m2m;
571
572 v4l2_m2m_ioctl_streamoff(file, fh, type);
573
574 mutex_lock(&m2m->lock);
575
576 /*
577 * If the last context is this one, reset it to make sure the device
578 * will be reconfigured when streaming is restarted.
579 */
580 if (m2m->last_ctx == ctx)
581 m2m->last_ctx = NULL;
582
583 /* Free the channel resources if this is the last chained context. */
584 if (ctx->chained && --m2m->chained_count == 0)
585 mxc_isi_channel_unchain(m2m->pipe);
586 ctx->chained = false;
587
588 /* Turn off the light with the last user. */
589 if (--m2m->usage_count == 0) {
590 mxc_isi_channel_disable(m2m->pipe);
591 mxc_isi_channel_put(m2m->pipe);
592 mxc_isi_channel_release(m2m->pipe);
593 }
594
595 WARN_ON(m2m->usage_count < 0);
596
597 mutex_unlock(&m2m->lock);
598
599 return 0;
600 }
601
602 static const struct v4l2_ioctl_ops mxc_isi_m2m_ioctl_ops = {
603 .vidioc_querycap = mxc_isi_m2m_querycap,
604
605 .vidioc_enum_fmt_vid_cap = mxc_isi_m2m_enum_fmt_vid,
606 .vidioc_enum_fmt_vid_out = mxc_isi_m2m_enum_fmt_vid,
607 .vidioc_g_fmt_vid_cap_mplane = mxc_isi_m2m_g_fmt_vid,
608 .vidioc_g_fmt_vid_out_mplane = mxc_isi_m2m_g_fmt_vid,
609 .vidioc_s_fmt_vid_cap_mplane = mxc_isi_m2m_s_fmt_vid,
610 .vidioc_s_fmt_vid_out_mplane = mxc_isi_m2m_s_fmt_vid,
611 .vidioc_try_fmt_vid_cap_mplane = mxc_isi_m2m_try_fmt_vid,
612 .vidioc_try_fmt_vid_out_mplane = mxc_isi_m2m_try_fmt_vid,
613
614 .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
615 .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
616 .vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
617 .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
618 .vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
619 .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
620 .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
621
622 .vidioc_streamon = mxc_isi_m2m_streamon,
623 .vidioc_streamoff = mxc_isi_m2m_streamoff,
624
625 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
626 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
627 };
628
629 /* -----------------------------------------------------------------------------
630 * Video device file operations
631 */
632
mxc_isi_m2m_init_format(struct mxc_isi_m2m_ctx * ctx,struct mxc_isi_m2m_ctx_queue_data * qdata,enum mxc_isi_video_type type)633 static void mxc_isi_m2m_init_format(struct mxc_isi_m2m_ctx *ctx,
634 struct mxc_isi_m2m_ctx_queue_data *qdata,
635 enum mxc_isi_video_type type)
636 {
637 qdata->format.width = MXC_ISI_DEF_WIDTH;
638 qdata->format.height = MXC_ISI_DEF_HEIGHT;
639 qdata->format.pixelformat = MXC_ISI_DEF_PIXEL_FORMAT;
640
641 qdata->info = mxc_isi_format_try(ctx->m2m->pipe, &qdata->format, type);
642 }
643
mxc_isi_m2m_open(struct file * file)644 static int mxc_isi_m2m_open(struct file *file)
645 {
646 struct video_device *vdev = video_devdata(file);
647 struct mxc_isi_m2m *m2m = video_drvdata(file);
648 struct mxc_isi_m2m_ctx *ctx;
649 int ret;
650
651 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
652 if (!ctx)
653 return -ENOMEM;
654
655 ctx->m2m = m2m;
656 mutex_init(&ctx->vb2_lock);
657
658 v4l2_fh_init(&ctx->fh, vdev);
659 file->private_data = &ctx->fh;
660
661 ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(m2m->m2m_dev, ctx,
662 &mxc_isi_m2m_queue_init);
663 if (IS_ERR(ctx->fh.m2m_ctx)) {
664 ret = PTR_ERR(ctx->fh.m2m_ctx);
665 ctx->fh.m2m_ctx = NULL;
666 goto err_fh;
667 }
668
669 mxc_isi_m2m_init_format(ctx, &ctx->queues.out, MXC_ISI_VIDEO_M2M_OUT);
670 mxc_isi_m2m_init_format(ctx, &ctx->queues.cap, MXC_ISI_VIDEO_M2M_CAP);
671
672 ret = mxc_isi_m2m_ctx_ctrls_create(ctx);
673 if (ret)
674 goto err_ctx;
675
676 ret = pm_runtime_resume_and_get(m2m->isi->dev);
677 if (ret)
678 goto err_ctrls;
679
680 v4l2_fh_add(&ctx->fh);
681
682 return 0;
683
684 err_ctrls:
685 mxc_isi_m2m_ctx_ctrls_delete(ctx);
686 err_ctx:
687 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
688 err_fh:
689 v4l2_fh_exit(&ctx->fh);
690 mutex_destroy(&ctx->vb2_lock);
691 kfree(ctx);
692 return ret;
693 }
694
mxc_isi_m2m_release(struct file * file)695 static int mxc_isi_m2m_release(struct file *file)
696 {
697 struct mxc_isi_m2m *m2m = video_drvdata(file);
698 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(file->private_data);
699
700 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
701 mxc_isi_m2m_ctx_ctrls_delete(ctx);
702
703 v4l2_fh_del(&ctx->fh);
704 v4l2_fh_exit(&ctx->fh);
705
706 mutex_destroy(&ctx->vb2_lock);
707 kfree(ctx);
708
709 pm_runtime_put(m2m->isi->dev);
710
711 return 0;
712 }
713
714 static const struct v4l2_file_operations mxc_isi_m2m_fops = {
715 .owner = THIS_MODULE,
716 .open = mxc_isi_m2m_open,
717 .release = mxc_isi_m2m_release,
718 .poll = v4l2_m2m_fop_poll,
719 .unlocked_ioctl = video_ioctl2,
720 .mmap = v4l2_m2m_fop_mmap,
721 };
722
723 /* -----------------------------------------------------------------------------
724 * Registration
725 */
726
mxc_isi_m2m_register(struct mxc_isi_dev * isi,struct v4l2_device * v4l2_dev)727 int mxc_isi_m2m_register(struct mxc_isi_dev *isi, struct v4l2_device *v4l2_dev)
728 {
729 struct mxc_isi_m2m *m2m = &isi->m2m;
730 struct video_device *vdev = &m2m->vdev;
731 struct media_link *link;
732 int ret;
733
734 m2m->isi = isi;
735 m2m->pipe = &isi->pipes[0];
736
737 mutex_init(&m2m->lock);
738
739 /* Initialize the video device and create controls. */
740 snprintf(vdev->name, sizeof(vdev->name), "mxc_isi.m2m");
741
742 vdev->fops = &mxc_isi_m2m_fops;
743 vdev->ioctl_ops = &mxc_isi_m2m_ioctl_ops;
744 vdev->v4l2_dev = v4l2_dev;
745 vdev->minor = -1;
746 vdev->release = video_device_release_empty;
747 vdev->vfl_dir = VFL_DIR_M2M;
748
749 vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
750 video_set_drvdata(vdev, m2m);
751
752 /* Create the M2M device. */
753 m2m->m2m_dev = v4l2_m2m_init(&mxc_isi_m2m_ops);
754 if (IS_ERR(m2m->m2m_dev)) {
755 dev_err(isi->dev, "failed to initialize m2m device\n");
756 ret = PTR_ERR(m2m->m2m_dev);
757 goto err_mutex;
758 }
759
760 /* Register the video device. */
761 ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
762 if (ret < 0) {
763 dev_err(isi->dev, "failed to register m2m device\n");
764 goto err_m2m;
765 }
766
767 /*
768 * Populate the media graph. We can't use the mem2mem helper
769 * v4l2_m2m_register_media_controller() as the M2M interface needs to
770 * be connected to the existing entities in the graph, so we have to
771 * wire things up manually:
772 *
773 * - The entity in the video_device, which isn't touched by the V4L2
774 * core for M2M devices, is used as the source I/O entity in the
775 * graph, connected to the crossbar switch.
776 *
777 * - The video device at the end of the pipeline provides the sink
778 * entity, and is already wired up in the graph.
779 *
780 * - A new interface is created, pointing at both entities. The sink
781 * entity will thus have two interfaces pointing to it.
782 */
783 m2m->pad.flags = MEDIA_PAD_FL_SOURCE;
784 vdev->entity.name = "mxc_isi.output";
785 vdev->entity.function = MEDIA_ENT_F_IO_V4L;
786 ret = media_entity_pads_init(&vdev->entity, 1, &m2m->pad);
787 if (ret)
788 goto err_video;
789
790 ret = media_device_register_entity(v4l2_dev->mdev, &vdev->entity);
791 if (ret)
792 goto err_entity_cleanup;
793
794 ret = media_create_pad_link(&vdev->entity, 0,
795 &m2m->isi->crossbar.sd.entity,
796 m2m->isi->crossbar.num_sinks - 1,
797 MEDIA_LNK_FL_IMMUTABLE |
798 MEDIA_LNK_FL_ENABLED);
799 if (ret)
800 goto err_entity_unreg;
801
802 m2m->intf = media_devnode_create(v4l2_dev->mdev, MEDIA_INTF_T_V4L_VIDEO,
803 0, VIDEO_MAJOR, vdev->minor);
804 if (!m2m->intf) {
805 ret = -ENOMEM;
806 goto err_entity_unreg;
807 }
808
809 link = media_create_intf_link(&vdev->entity, &m2m->intf->intf,
810 MEDIA_LNK_FL_IMMUTABLE |
811 MEDIA_LNK_FL_ENABLED);
812 if (!link) {
813 ret = -ENOMEM;
814 goto err_devnode;
815 }
816
817 link = media_create_intf_link(&m2m->pipe->video.vdev.entity,
818 &m2m->intf->intf,
819 MEDIA_LNK_FL_IMMUTABLE |
820 MEDIA_LNK_FL_ENABLED);
821 if (!link) {
822 ret = -ENOMEM;
823 goto err_devnode;
824 }
825
826 return 0;
827
828 err_devnode:
829 media_devnode_remove(m2m->intf);
830 err_entity_unreg:
831 media_device_unregister_entity(&vdev->entity);
832 err_entity_cleanup:
833 media_entity_cleanup(&vdev->entity);
834 err_video:
835 video_unregister_device(vdev);
836 err_m2m:
837 v4l2_m2m_release(m2m->m2m_dev);
838 err_mutex:
839 mutex_destroy(&m2m->lock);
840 return ret;
841 }
842
mxc_isi_m2m_unregister(struct mxc_isi_dev * isi)843 int mxc_isi_m2m_unregister(struct mxc_isi_dev *isi)
844 {
845 struct mxc_isi_m2m *m2m = &isi->m2m;
846 struct video_device *vdev = &m2m->vdev;
847
848 video_unregister_device(vdev);
849
850 v4l2_m2m_release(m2m->m2m_dev);
851 media_devnode_remove(m2m->intf);
852 media_entity_cleanup(&vdev->entity);
853 mutex_destroy(&m2m->lock);
854
855 return 0;
856 }
857