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 .wait_prepare = vb2_ops_wait_prepare,
273 .wait_finish = vb2_ops_wait_finish,
274 .start_streaming = mxc_isi_m2m_vb2_start_streaming,
275 .stop_streaming = mxc_isi_m2m_vb2_stop_streaming,
276 };
277
mxc_isi_m2m_queue_init(void * priv,struct vb2_queue * src_vq,struct vb2_queue * dst_vq)278 static int mxc_isi_m2m_queue_init(void *priv, struct vb2_queue *src_vq,
279 struct vb2_queue *dst_vq)
280 {
281 struct mxc_isi_m2m_ctx *ctx = priv;
282 struct mxc_isi_m2m *m2m = ctx->m2m;
283 int ret;
284
285 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
286 src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
287 src_vq->drv_priv = ctx;
288 src_vq->buf_struct_size = sizeof(struct mxc_isi_m2m_buffer);
289 src_vq->ops = &mxc_isi_m2m_vb2_qops;
290 src_vq->mem_ops = &vb2_dma_contig_memops;
291 src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
292 src_vq->lock = &ctx->vb2_lock;
293 src_vq->dev = m2m->isi->dev;
294
295 ret = vb2_queue_init(src_vq);
296 if (ret)
297 return ret;
298
299 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
300 dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
301 dst_vq->drv_priv = ctx;
302 dst_vq->buf_struct_size = sizeof(struct mxc_isi_m2m_buffer);
303 dst_vq->ops = &mxc_isi_m2m_vb2_qops;
304 dst_vq->mem_ops = &vb2_dma_contig_memops;
305 dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
306 dst_vq->lock = &ctx->vb2_lock;
307 dst_vq->dev = m2m->isi->dev;
308
309 return vb2_queue_init(dst_vq);
310 }
311
312 /* -----------------------------------------------------------------------------
313 * V4L2 controls
314 */
315
316 static inline struct mxc_isi_m2m_ctx *
ctrl_to_mxc_isi_m2m_ctx(struct v4l2_ctrl * ctrl)317 ctrl_to_mxc_isi_m2m_ctx(struct v4l2_ctrl *ctrl)
318 {
319 return container_of(ctrl->handler, struct mxc_isi_m2m_ctx, ctrls.handler);
320 }
321
mxc_isi_m2m_ctx_s_ctrl(struct v4l2_ctrl * ctrl)322 static int mxc_isi_m2m_ctx_s_ctrl(struct v4l2_ctrl *ctrl)
323 {
324 struct mxc_isi_m2m_ctx *ctx = ctrl_to_mxc_isi_m2m_ctx(ctrl);
325
326 switch (ctrl->id) {
327 case V4L2_CID_HFLIP:
328 ctx->ctrls.hflip = ctrl->val;
329 break;
330
331 case V4L2_CID_VFLIP:
332 ctx->ctrls.vflip = ctrl->val;
333 break;
334
335 case V4L2_CID_ALPHA_COMPONENT:
336 ctx->ctrls.alpha = ctrl->val;
337 break;
338 }
339
340 return 0;
341 }
342
343 static const struct v4l2_ctrl_ops mxc_isi_m2m_ctx_ctrl_ops = {
344 .s_ctrl = mxc_isi_m2m_ctx_s_ctrl,
345 };
346
mxc_isi_m2m_ctx_ctrls_create(struct mxc_isi_m2m_ctx * ctx)347 static int mxc_isi_m2m_ctx_ctrls_create(struct mxc_isi_m2m_ctx *ctx)
348 {
349 struct v4l2_ctrl_handler *handler = &ctx->ctrls.handler;
350 int ret;
351
352 v4l2_ctrl_handler_init(handler, 3);
353
354 v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops,
355 V4L2_CID_ALPHA_COMPONENT, 0, 255, 1, 0);
356 v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops,
357 V4L2_CID_HFLIP, 0, 1, 1, 0);
358 v4l2_ctrl_new_std(handler, &mxc_isi_m2m_ctx_ctrl_ops,
359 V4L2_CID_VFLIP, 0, 1, 1, 0);
360
361 if (handler->error) {
362 ret = handler->error;
363 v4l2_ctrl_handler_free(handler);
364 return ret;
365 }
366
367 ctx->fh.ctrl_handler = handler;
368
369 return 0;
370 }
371
mxc_isi_m2m_ctx_ctrls_delete(struct mxc_isi_m2m_ctx * ctx)372 static void mxc_isi_m2m_ctx_ctrls_delete(struct mxc_isi_m2m_ctx *ctx)
373 {
374 v4l2_ctrl_handler_free(&ctx->ctrls.handler);
375 }
376
377 /* -----------------------------------------------------------------------------
378 * V4L2 ioctls
379 */
380
mxc_isi_m2m_querycap(struct file * file,void * fh,struct v4l2_capability * cap)381 static int mxc_isi_m2m_querycap(struct file *file, void *fh,
382 struct v4l2_capability *cap)
383 {
384 strscpy(cap->driver, MXC_ISI_DRIVER_NAME, sizeof(cap->driver));
385 strscpy(cap->card, MXC_ISI_M2M, sizeof(cap->card));
386 cap->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
387 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
388
389 return 0;
390 }
391
mxc_isi_m2m_enum_fmt_vid(struct file * file,void * fh,struct v4l2_fmtdesc * f)392 static int mxc_isi_m2m_enum_fmt_vid(struct file *file, void *fh,
393 struct v4l2_fmtdesc *f)
394 {
395 const enum mxc_isi_video_type type =
396 f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ?
397 MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP;
398 const struct mxc_isi_format_info *info;
399
400 info = mxc_isi_format_enum(f->index, type);
401 if (!info)
402 return -EINVAL;
403
404 f->pixelformat = info->fourcc;
405 f->flags |= V4L2_FMT_FLAG_CSC_COLORSPACE | V4L2_FMT_FLAG_CSC_YCBCR_ENC
406 | V4L2_FMT_FLAG_CSC_QUANTIZATION | V4L2_FMT_FLAG_CSC_XFER_FUNC;
407
408 return 0;
409 }
410
411 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)412 __mxc_isi_m2m_try_fmt_vid(struct mxc_isi_m2m_ctx *ctx,
413 struct v4l2_pix_format_mplane *pix,
414 const enum mxc_isi_video_type type)
415 {
416 if (type == MXC_ISI_VIDEO_M2M_CAP) {
417 /* Downscaling only */
418 pix->width = min(pix->width, ctx->queues.out.format.width);
419 pix->height = min(pix->height, ctx->queues.out.format.height);
420 }
421
422 return mxc_isi_format_try(ctx->m2m->pipe, pix, type);
423 }
424
mxc_isi_m2m_try_fmt_vid(struct file * file,void * fh,struct v4l2_format * f)425 static int mxc_isi_m2m_try_fmt_vid(struct file *file, void *fh,
426 struct v4l2_format *f)
427 {
428 const enum mxc_isi_video_type type =
429 f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ?
430 MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP;
431 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
432
433 __mxc_isi_m2m_try_fmt_vid(ctx, &f->fmt.pix_mp, type);
434
435 return 0;
436 }
437
mxc_isi_m2m_g_fmt_vid(struct file * file,void * fh,struct v4l2_format * f)438 static int mxc_isi_m2m_g_fmt_vid(struct file *file, void *fh,
439 struct v4l2_format *f)
440 {
441 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
442 const struct mxc_isi_m2m_ctx_queue_data *qdata =
443 mxc_isi_m2m_ctx_qdata(ctx, f->type);
444
445 f->fmt.pix_mp = qdata->format;
446
447 return 0;
448 }
449
mxc_isi_m2m_s_fmt_vid(struct file * file,void * fh,struct v4l2_format * f)450 static int mxc_isi_m2m_s_fmt_vid(struct file *file, void *fh,
451 struct v4l2_format *f)
452 {
453 const enum mxc_isi_video_type type =
454 f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ?
455 MXC_ISI_VIDEO_M2M_OUT : MXC_ISI_VIDEO_M2M_CAP;
456 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
457 struct v4l2_pix_format_mplane *pix = &f->fmt.pix_mp;
458 const struct mxc_isi_format_info *info;
459 struct vb2_queue *vq;
460
461 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
462 if (!vq)
463 return -EINVAL;
464
465 if (vb2_is_busy(vq))
466 return -EBUSY;
467
468 info = __mxc_isi_m2m_try_fmt_vid(ctx, pix, type);
469
470 if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
471 ctx->queues.out.format = *pix;
472 ctx->queues.out.info = info;
473 }
474
475 /*
476 * Always set the format on the capture side, due to either format
477 * propagation or direct setting.
478 */
479 ctx->queues.cap.format = *pix;
480 ctx->queues.cap.info = info;
481
482 return 0;
483 }
484
mxc_isi_m2m_streamon(struct file * file,void * fh,enum v4l2_buf_type type)485 static int mxc_isi_m2m_streamon(struct file *file, void *fh,
486 enum v4l2_buf_type type)
487 {
488 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
489 const struct v4l2_pix_format_mplane *out_pix = &ctx->queues.out.format;
490 const struct v4l2_pix_format_mplane *cap_pix = &ctx->queues.cap.format;
491 const struct mxc_isi_format_info *cap_info = ctx->queues.cap.info;
492 const struct mxc_isi_format_info *out_info = ctx->queues.out.info;
493 struct mxc_isi_m2m *m2m = ctx->m2m;
494 bool bypass;
495
496 int ret;
497
498 mutex_lock(&m2m->lock);
499
500 if (m2m->usage_count == INT_MAX) {
501 ret = -EOVERFLOW;
502 goto unlock;
503 }
504
505 bypass = cap_pix->width == out_pix->width &&
506 cap_pix->height == out_pix->height &&
507 cap_info->encoding == out_info->encoding;
508
509 /*
510 * Acquire the pipe and initialize the channel with the first user of
511 * the M2M device.
512 */
513 if (m2m->usage_count == 0) {
514 ret = mxc_isi_channel_acquire(m2m->pipe,
515 &mxc_isi_m2m_frame_write_done,
516 bypass);
517 if (ret)
518 goto unlock;
519
520 mxc_isi_channel_get(m2m->pipe);
521 }
522
523 m2m->usage_count++;
524
525 /*
526 * Allocate resources for the channel, counting how many users require
527 * buffer chaining.
528 */
529 if (!ctx->chained && out_pix->width > MXC_ISI_MAX_WIDTH_UNCHAINED) {
530 ret = mxc_isi_channel_chain(m2m->pipe, bypass);
531 if (ret)
532 goto deinit;
533
534 m2m->chained_count++;
535 ctx->chained = true;
536 }
537
538 /*
539 * Drop the lock to start the stream, as the .device_run() operation
540 * needs to acquire it.
541 */
542 mutex_unlock(&m2m->lock);
543 ret = v4l2_m2m_ioctl_streamon(file, fh, type);
544 if (ret) {
545 /* Reacquire the lock for the cleanup path. */
546 mutex_lock(&m2m->lock);
547 goto unchain;
548 }
549
550 return 0;
551
552 unchain:
553 if (ctx->chained && --m2m->chained_count == 0)
554 mxc_isi_channel_unchain(m2m->pipe);
555 ctx->chained = false;
556
557 deinit:
558 if (--m2m->usage_count == 0) {
559 mxc_isi_channel_put(m2m->pipe);
560 mxc_isi_channel_release(m2m->pipe);
561 }
562
563 unlock:
564 mutex_unlock(&m2m->lock);
565 return ret;
566 }
567
mxc_isi_m2m_streamoff(struct file * file,void * fh,enum v4l2_buf_type type)568 static int mxc_isi_m2m_streamoff(struct file *file, void *fh,
569 enum v4l2_buf_type type)
570 {
571 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(fh);
572 struct mxc_isi_m2m *m2m = ctx->m2m;
573
574 v4l2_m2m_ioctl_streamoff(file, fh, type);
575
576 mutex_lock(&m2m->lock);
577
578 /*
579 * If the last context is this one, reset it to make sure the device
580 * will be reconfigured when streaming is restarted.
581 */
582 if (m2m->last_ctx == ctx)
583 m2m->last_ctx = NULL;
584
585 /* Free the channel resources if this is the last chained context. */
586 if (ctx->chained && --m2m->chained_count == 0)
587 mxc_isi_channel_unchain(m2m->pipe);
588 ctx->chained = false;
589
590 /* Turn off the light with the last user. */
591 if (--m2m->usage_count == 0) {
592 mxc_isi_channel_disable(m2m->pipe);
593 mxc_isi_channel_put(m2m->pipe);
594 mxc_isi_channel_release(m2m->pipe);
595 }
596
597 WARN_ON(m2m->usage_count < 0);
598
599 mutex_unlock(&m2m->lock);
600
601 return 0;
602 }
603
604 static const struct v4l2_ioctl_ops mxc_isi_m2m_ioctl_ops = {
605 .vidioc_querycap = mxc_isi_m2m_querycap,
606
607 .vidioc_enum_fmt_vid_cap = mxc_isi_m2m_enum_fmt_vid,
608 .vidioc_enum_fmt_vid_out = mxc_isi_m2m_enum_fmt_vid,
609 .vidioc_g_fmt_vid_cap_mplane = mxc_isi_m2m_g_fmt_vid,
610 .vidioc_g_fmt_vid_out_mplane = mxc_isi_m2m_g_fmt_vid,
611 .vidioc_s_fmt_vid_cap_mplane = mxc_isi_m2m_s_fmt_vid,
612 .vidioc_s_fmt_vid_out_mplane = mxc_isi_m2m_s_fmt_vid,
613 .vidioc_try_fmt_vid_cap_mplane = mxc_isi_m2m_try_fmt_vid,
614 .vidioc_try_fmt_vid_out_mplane = mxc_isi_m2m_try_fmt_vid,
615
616 .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
617 .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
618 .vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
619 .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
620 .vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
621 .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
622 .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
623
624 .vidioc_streamon = mxc_isi_m2m_streamon,
625 .vidioc_streamoff = mxc_isi_m2m_streamoff,
626
627 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
628 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
629 };
630
631 /* -----------------------------------------------------------------------------
632 * Video device file operations
633 */
634
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)635 static void mxc_isi_m2m_init_format(struct mxc_isi_m2m_ctx *ctx,
636 struct mxc_isi_m2m_ctx_queue_data *qdata,
637 enum mxc_isi_video_type type)
638 {
639 qdata->format.width = MXC_ISI_DEF_WIDTH;
640 qdata->format.height = MXC_ISI_DEF_HEIGHT;
641 qdata->format.pixelformat = MXC_ISI_DEF_PIXEL_FORMAT;
642
643 qdata->info = mxc_isi_format_try(ctx->m2m->pipe, &qdata->format, type);
644 }
645
mxc_isi_m2m_open(struct file * file)646 static int mxc_isi_m2m_open(struct file *file)
647 {
648 struct video_device *vdev = video_devdata(file);
649 struct mxc_isi_m2m *m2m = video_drvdata(file);
650 struct mxc_isi_m2m_ctx *ctx;
651 int ret;
652
653 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
654 if (!ctx)
655 return -ENOMEM;
656
657 ctx->m2m = m2m;
658 mutex_init(&ctx->vb2_lock);
659
660 v4l2_fh_init(&ctx->fh, vdev);
661 file->private_data = &ctx->fh;
662
663 ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(m2m->m2m_dev, ctx,
664 &mxc_isi_m2m_queue_init);
665 if (IS_ERR(ctx->fh.m2m_ctx)) {
666 ret = PTR_ERR(ctx->fh.m2m_ctx);
667 ctx->fh.m2m_ctx = NULL;
668 goto err_fh;
669 }
670
671 mxc_isi_m2m_init_format(ctx, &ctx->queues.out, MXC_ISI_VIDEO_M2M_OUT);
672 mxc_isi_m2m_init_format(ctx, &ctx->queues.cap, MXC_ISI_VIDEO_M2M_CAP);
673
674 ret = mxc_isi_m2m_ctx_ctrls_create(ctx);
675 if (ret)
676 goto err_ctx;
677
678 ret = pm_runtime_resume_and_get(m2m->isi->dev);
679 if (ret)
680 goto err_ctrls;
681
682 v4l2_fh_add(&ctx->fh);
683
684 return 0;
685
686 err_ctrls:
687 mxc_isi_m2m_ctx_ctrls_delete(ctx);
688 err_ctx:
689 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
690 err_fh:
691 v4l2_fh_exit(&ctx->fh);
692 mutex_destroy(&ctx->vb2_lock);
693 kfree(ctx);
694 return ret;
695 }
696
mxc_isi_m2m_release(struct file * file)697 static int mxc_isi_m2m_release(struct file *file)
698 {
699 struct mxc_isi_m2m *m2m = video_drvdata(file);
700 struct mxc_isi_m2m_ctx *ctx = to_isi_m2m_ctx(file->private_data);
701
702 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
703 mxc_isi_m2m_ctx_ctrls_delete(ctx);
704
705 v4l2_fh_del(&ctx->fh);
706 v4l2_fh_exit(&ctx->fh);
707
708 mutex_destroy(&ctx->vb2_lock);
709 kfree(ctx);
710
711 pm_runtime_put(m2m->isi->dev);
712
713 return 0;
714 }
715
716 static const struct v4l2_file_operations mxc_isi_m2m_fops = {
717 .owner = THIS_MODULE,
718 .open = mxc_isi_m2m_open,
719 .release = mxc_isi_m2m_release,
720 .poll = v4l2_m2m_fop_poll,
721 .unlocked_ioctl = video_ioctl2,
722 .mmap = v4l2_m2m_fop_mmap,
723 };
724
725 /* -----------------------------------------------------------------------------
726 * Registration
727 */
728
mxc_isi_m2m_register(struct mxc_isi_dev * isi,struct v4l2_device * v4l2_dev)729 int mxc_isi_m2m_register(struct mxc_isi_dev *isi, struct v4l2_device *v4l2_dev)
730 {
731 struct mxc_isi_m2m *m2m = &isi->m2m;
732 struct video_device *vdev = &m2m->vdev;
733 struct media_link *link;
734 int ret;
735
736 m2m->isi = isi;
737 m2m->pipe = &isi->pipes[0];
738
739 mutex_init(&m2m->lock);
740
741 /* Initialize the video device and create controls. */
742 snprintf(vdev->name, sizeof(vdev->name), "mxc_isi.m2m");
743
744 vdev->fops = &mxc_isi_m2m_fops;
745 vdev->ioctl_ops = &mxc_isi_m2m_ioctl_ops;
746 vdev->v4l2_dev = v4l2_dev;
747 vdev->minor = -1;
748 vdev->release = video_device_release_empty;
749 vdev->vfl_dir = VFL_DIR_M2M;
750
751 vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_M2M_MPLANE;
752 video_set_drvdata(vdev, m2m);
753
754 /* Create the M2M device. */
755 m2m->m2m_dev = v4l2_m2m_init(&mxc_isi_m2m_ops);
756 if (IS_ERR(m2m->m2m_dev)) {
757 dev_err(isi->dev, "failed to initialize m2m device\n");
758 ret = PTR_ERR(m2m->m2m_dev);
759 goto err_mutex;
760 }
761
762 /* Register the video device. */
763 ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
764 if (ret < 0) {
765 dev_err(isi->dev, "failed to register m2m device\n");
766 goto err_m2m;
767 }
768
769 /*
770 * Populate the media graph. We can't use the mem2mem helper
771 * v4l2_m2m_register_media_controller() as the M2M interface needs to
772 * be connected to the existing entities in the graph, so we have to
773 * wire things up manually:
774 *
775 * - The entity in the video_device, which isn't touched by the V4L2
776 * core for M2M devices, is used as the source I/O entity in the
777 * graph, connected to the crossbar switch.
778 *
779 * - The video device at the end of the pipeline provides the sink
780 * entity, and is already wired up in the graph.
781 *
782 * - A new interface is created, pointing at both entities. The sink
783 * entity will thus have two interfaces pointing to it.
784 */
785 m2m->pad.flags = MEDIA_PAD_FL_SOURCE;
786 vdev->entity.name = "mxc_isi.output";
787 vdev->entity.function = MEDIA_ENT_F_IO_V4L;
788 ret = media_entity_pads_init(&vdev->entity, 1, &m2m->pad);
789 if (ret)
790 goto err_video;
791
792 ret = media_device_register_entity(v4l2_dev->mdev, &vdev->entity);
793 if (ret)
794 goto err_entity_cleanup;
795
796 ret = media_create_pad_link(&vdev->entity, 0,
797 &m2m->isi->crossbar.sd.entity,
798 m2m->isi->crossbar.num_sinks - 1,
799 MEDIA_LNK_FL_IMMUTABLE |
800 MEDIA_LNK_FL_ENABLED);
801 if (ret)
802 goto err_entity_unreg;
803
804 m2m->intf = media_devnode_create(v4l2_dev->mdev, MEDIA_INTF_T_V4L_VIDEO,
805 0, VIDEO_MAJOR, vdev->minor);
806 if (!m2m->intf) {
807 ret = -ENOMEM;
808 goto err_entity_unreg;
809 }
810
811 link = media_create_intf_link(&vdev->entity, &m2m->intf->intf,
812 MEDIA_LNK_FL_IMMUTABLE |
813 MEDIA_LNK_FL_ENABLED);
814 if (!link) {
815 ret = -ENOMEM;
816 goto err_devnode;
817 }
818
819 link = media_create_intf_link(&m2m->pipe->video.vdev.entity,
820 &m2m->intf->intf,
821 MEDIA_LNK_FL_IMMUTABLE |
822 MEDIA_LNK_FL_ENABLED);
823 if (!link) {
824 ret = -ENOMEM;
825 goto err_devnode;
826 }
827
828 return 0;
829
830 err_devnode:
831 media_devnode_remove(m2m->intf);
832 err_entity_unreg:
833 media_device_unregister_entity(&vdev->entity);
834 err_entity_cleanup:
835 media_entity_cleanup(&vdev->entity);
836 err_video:
837 video_unregister_device(vdev);
838 err_m2m:
839 v4l2_m2m_release(m2m->m2m_dev);
840 err_mutex:
841 mutex_destroy(&m2m->lock);
842 return ret;
843 }
844
mxc_isi_m2m_unregister(struct mxc_isi_dev * isi)845 int mxc_isi_m2m_unregister(struct mxc_isi_dev *isi)
846 {
847 struct mxc_isi_m2m *m2m = &isi->m2m;
848 struct video_device *vdev = &m2m->vdev;
849
850 video_unregister_device(vdev);
851
852 v4l2_m2m_release(m2m->m2m_dev);
853 media_devnode_remove(m2m->intf);
854 media_entity_cleanup(&vdev->entity);
855 mutex_destroy(&m2m->lock);
856
857 return 0;
858 }
859