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SubjectRe: [PATCH v3 2/9] media: vimc: Add get_frame callback
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Hi,

Am 20.08.20 um 17:36 schrieb Kieran Bingham:
> Hi Kaaira,
>
> On 19/08/2020 19:04, Kaaira Gupta wrote:
>> In the process of making vimc compatible for multiple streams, we need
>> to create a frame passing process such that two different entities can
>> get the frame from a common entity. This isn't possible currently without
>> calling process_frame twice for the common entity, as process_frames
>> returns the frame which gets passed on.
>>
>> So, to take care of this, add a get_frame callback to vimc device and
>> use it to get the frames for an entity from previous entity instead of
>> returning and passing the frames as an argument in process_frame.
>>
>> Signed-off-by: Kaaira Gupta <kgupta@es.iitr.ac.in>
>> ---
>> .../media/test-drivers/vimc/vimc-capture.c | 18 +++++++++++++++---
>> drivers/media/test-drivers/vimc/vimc-common.h | 7 ++++---
>> .../media/test-drivers/vimc/vimc-debayer.c | 19 ++++++++++++++++---
>> drivers/media/test-drivers/vimc/vimc-scaler.c | 18 +++++++++++++++---
>> drivers/media/test-drivers/vimc/vimc-sensor.c | 11 +++++++++--
>> .../media/test-drivers/vimc/vimc-streamer.c | 10 ++++++----
>> 6 files changed, 65 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/media/test-drivers/vimc/vimc-capture.c b/drivers/media/test-drivers/vimc/vimc-capture.c
>> index c63496b17b9a..a8cbb8e4d5ba 100644
>> --- a/drivers/media/test-drivers/vimc/vimc-capture.c
>> +++ b/drivers/media/test-drivers/vimc/vimc-capture.c
>> @@ -355,12 +355,13 @@ static void vimc_cap_unregister(struct vimc_ent_device *ved)
>> video_unregister_device(&vcap->vdev);
>> }
>>
>> -static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
>> - const void *frame)
>> +static int vimc_cap_process_frame(struct vimc_ent_device *ved)
>> {
>> struct vimc_cap_device *vcap = container_of(ved, struct vimc_cap_device,
>> ved);
>> struct vimc_cap_buffer *vimc_buf;
>> + struct v4l2_subdev *sd;
>> + const void *frame;
>> void *vbuf;
>>
>> spin_lock(&vcap->qlock);
>> @@ -370,7 +371,7 @@ static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
>> typeof(*vimc_buf), list);
>> if (!vimc_buf) {
>> spin_unlock(&vcap->qlock);
>> - return ERR_PTR(-EAGAIN);
>> + return -EAGAIN;
>> }
>>
>> /* Remove this entry from the list */
>> @@ -385,12 +386,22 @@ static void *vimc_cap_process_frame(struct vimc_ent_device *ved,
>>
>> vbuf = vb2_plane_vaddr(&vimc_buf->vb2.vb2_buf, 0);
>>
>> + sd = media_entity_to_v4l2_subdev(vimc_get_source_entity(ved->ent));
>> + ved = v4l2_get_subdevdata(sd);
>> + frame = ved->get_frame(ved);
>
> Hrm, this code block is used in several places throughout this patch,
> and it aliases the function parameter ved to a new device which isn't
> nice. Not a problem as long as it's not used for the original VED after
> of course.
>
> But I wonder if we should instead add a helper into vimc-common.c:
>
> struct vimc_ent_device *vimc_get_source_ved(struct vimc_ent_device *ved)
> {
> struct media_entity *ent;
> struct v4l2_subdev *sd;
>
> ent = vimc_get_source_entity(ved->ent);
> if (!ent)
> return NULL;
>
> sd = media_entity_to_v4l2_subdev(ent);
>
> return v4l2_get_subdevdata(sd);
> }
>
> It might not be necessary though, just an idea. If you like it, it can
> be a patch on it's own after the vimc_get_source_entity() moving patch.
>
>
> But it does show that vimc_get_source_entity() can return NULL which
> might have to be checked... though perhaps we 'know' it will always be
> valid ...
>
> Also, following the links for each entity, for each frame sounds like
> quite a lot of work. I wonder if the active source entity should be
> cached in each VED ...

I think that we can add a pad number as an argument for the function and
only ask for source entity for that pad.

>
> That could be done on top anyway...
>
> Overall, this looks like it will work, so with comments addressed how
> you wish,
>
> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
>
>
>> +
>> memcpy(vbuf, frame, vcap->format.sizeimage);
>>
>> /* Set it as ready */
>> vb2_set_plane_payload(&vimc_buf->vb2.vb2_buf, 0,
>> vcap->format.sizeimage);
>> vb2_buffer_done(&vimc_buf->vb2.vb2_buf, VB2_BUF_STATE_DONE);
>> +
>> + return 0;
>> +}
>> +
>> +static void *vimc_cap_get_frame(struct vimc_ent_device *ved)
>> +{
>> return NULL;
>> }
>>
>> @@ -455,6 +466,7 @@ static struct vimc_ent_device *vimc_cap_add(struct vimc_device *vimc,
>> vcap->ved.ent = &vcap->vdev.entity;
>> vcap->ved.process_frame = vimc_cap_process_frame;
>> vcap->ved.vdev_get_format = vimc_cap_get_format;
>> + vcap->ved.get_frame = vimc_cap_get_frame;
>> vcap->ved.dev = vimc->mdev.dev;
>>
>> /* Initialize the video_device struct */
>> diff --git a/drivers/media/test-drivers/vimc/vimc-common.h b/drivers/media/test-drivers/vimc/vimc-common.h
>> index 4c580d854007..287d66edff49 100644
>> --- a/drivers/media/test-drivers/vimc/vimc-common.h
>> +++ b/drivers/media/test-drivers/vimc/vimc-common.h
>> @@ -85,7 +85,8 @@ struct vimc_pix_map {
>> *
>> * @dev: a pointer of the device struct of the driver
>> * @ent: the pointer to struct media_entity for the node
>> - * @process_frame: callback send a frame to that node
>> + * @get_frame: callback that sends a frame processed by the entity

I see that all entities implemnt the 'get_frame' callback by returning the frame
maybe we can instead make the frame a filed of vimc_ent_device instead of that
callback.

Thanks,
Dafna

>
> s/sends a/obtains the/
>
>
>
>> + * @process_frame: callback that processes a frame
>> * @vdev_get_format: callback that returns the current format a pad, used
>> * only when is_media_entity_v4l2_video_device(ent) returns
>> * true
>> @@ -101,8 +102,8 @@ struct vimc_pix_map {
>> struct vimc_ent_device {
>> struct device *dev;
>> struct media_entity *ent;
>> - void * (*process_frame)(struct vimc_ent_device *ved,
>> - const void *frame);
>> + void * (*get_frame)(struct vimc_ent_device *ved);
>> + int (*process_frame)(struct vimc_ent_device *ved);
>> void (*vdev_get_format)(struct vimc_ent_device *ved,
>> struct v4l2_pix_format *fmt);
>> };
>> diff --git a/drivers/media/test-drivers/vimc/vimc-debayer.c b/drivers/media/test-drivers/vimc/vimc-debayer.c
>> index c3f6fef34f68..f61e6e8899ac 100644
>> --- a/drivers/media/test-drivers/vimc/vimc-debayer.c
>> +++ b/drivers/media/test-drivers/vimc/vimc-debayer.c
>> @@ -491,17 +491,22 @@ static void vimc_deb_calc_rgb_sink(struct vimc_deb_device *vdeb,
>> }
>> }
>>
>> -static void *vimc_deb_process_frame(struct vimc_ent_device *ved,
>> - const void *sink_frame)
>> +static int vimc_deb_process_frame(struct vimc_ent_device *ved)
>> {
>> struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,
>> ved);
>> unsigned int rgb[3];
>> unsigned int i, j;
>> + struct v4l2_subdev *sd;
>> + const void *sink_frame;
>>
>> /* If the stream in this node is not active, just return */
>> if (!vdeb->src_frame)
>> - return ERR_PTR(-EINVAL);
>> + return -EINVAL;
>> +
>> + sd = media_entity_to_v4l2_subdev(vimc_get_source_entity(ved->ent));
>> + ved = v4l2_get_subdevdata(sd);
>> + sink_frame = ved->get_frame(ved);
>>
>> for (i = 0; i < vdeb->sink_fmt.height; i++)
>> for (j = 0; j < vdeb->sink_fmt.width; j++) {
>> @@ -509,6 +514,13 @@ static void *vimc_deb_process_frame(struct vimc_ent_device *ved,
>> vdeb->set_rgb_src(vdeb, i, j, rgb);
>> }
>>
>> + return 0;
>> +}
>> +
>> +static void *vimc_deb_get_frame(struct vimc_ent_device *ved)
>> +{
>> + struct vimc_deb_device *vdeb = container_of(ved, struct vimc_deb_device,
>> + ved);
>> return vdeb->src_frame;
>> }
>>
>> @@ -593,6 +605,7 @@ static struct vimc_ent_device *vimc_deb_add(struct vimc_device *vimc,
>> goto err_free_hdl;
>>
>> vdeb->ved.process_frame = vimc_deb_process_frame;
>> + vdeb->ved.get_frame = vimc_deb_get_frame;
>> vdeb->ved.dev = vimc->mdev.dev;
>> vdeb->mean_win_size = vimc_deb_ctrl_mean_win_size.def;
>>
>> diff --git a/drivers/media/test-drivers/vimc/vimc-scaler.c b/drivers/media/test-drivers/vimc/vimc-scaler.c
>> index 121fa7d62a2e..347f9cd4a168 100644
>> --- a/drivers/media/test-drivers/vimc/vimc-scaler.c
>> +++ b/drivers/media/test-drivers/vimc/vimc-scaler.c
>> @@ -455,18 +455,29 @@ static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
>> vimc_sca_scale_pix(vsca, i, j, sink_frame);
>> }
>>
>> -static void *vimc_sca_process_frame(struct vimc_ent_device *ved,
>> - const void *sink_frame)
>> +static int vimc_sca_process_frame(struct vimc_ent_device *ved)
>> {
>> struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
>> ved);
>> + const void *sink_frame;
>> + struct v4l2_subdev *sd;
>>
>> /* If the stream in this node is not active, just return */
>> if (!vsca->src_frame)
>> - return ERR_PTR(-EINVAL);
>> + return -EINVAL;
>>
>> + sd = media_entity_to_v4l2_subdev(vimc_get_source_entity(ved->ent));
>> + ved = v4l2_get_subdevdata(sd);
>> + sink_frame = ved->get_frame(ved);
>> vimc_sca_fill_src_frame(vsca, sink_frame);
>>
>> + return 0;
>> +};
>> +
>> +static void *vimc_sca_get_frame(struct vimc_ent_device *ved)
>> +{
>> + struct vimc_sca_device *vsca = container_of(ved, struct vimc_sca_device,
>> + ved);
>> return vsca->src_frame;
>> };
>>
>> @@ -505,6 +516,7 @@ static struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
>> }
>>
>> vsca->ved.process_frame = vimc_sca_process_frame;
>> + vsca->ved.get_frame = vimc_sca_get_frame;
>> vsca->ved.dev = vimc->mdev.dev;
>>
>> /* Initialize the frame format */
>> diff --git a/drivers/media/test-drivers/vimc/vimc-sensor.c b/drivers/media/test-drivers/vimc/vimc-sensor.c
>> index ba5db5a150b4..32a2c39de2cd 100644
>> --- a/drivers/media/test-drivers/vimc/vimc-sensor.c
>> +++ b/drivers/media/test-drivers/vimc/vimc-sensor.c
>> @@ -190,8 +190,7 @@ static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {
>> .set_fmt = vimc_sen_set_fmt,
>> };
>>
>> -static void *vimc_sen_process_frame(struct vimc_ent_device *ved,
>> - const void *sink_frame)
>> +static int vimc_sen_process_frame(struct vimc_ent_device *ved)
>> {
>> struct vimc_sen_device *vsen = container_of(ved, struct vimc_sen_device,
>> ved);
>> @@ -238,6 +237,13 @@ static void *vimc_sen_process_frame(struct vimc_ent_device *ved,
>> break;
>> }
>>
>> + return 0;
>> +}
>> +
>> +static void *vimc_sen_get_frame(struct vimc_ent_device *ved)
>> +{
>> + struct vimc_sen_device *vsen = container_of(ved, struct vimc_sen_device,
>> + ved);
>> return vsen->frame;
>> }
>>
>> @@ -429,6 +435,7 @@ static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
>> goto err_free_tpg;
>>
>> vsen->ved.process_frame = vimc_sen_process_frame;
>> + vsen->ved.get_frame = vimc_sen_get_frame;
>> vsen->ved.dev = vimc->mdev.dev;
>>
>> /* Initialize the frame format */
>> diff --git a/drivers/media/test-drivers/vimc/vimc-streamer.c b/drivers/media/test-drivers/vimc/vimc-streamer.c
>> index 4f8384246042..c1644d69686d 100644
>> --- a/drivers/media/test-drivers/vimc/vimc-streamer.c
>> +++ b/drivers/media/test-drivers/vimc/vimc-streamer.c
>> @@ -125,7 +125,8 @@ static int vimc_streamer_pipeline_init(struct vimc_stream *stream,
>> static int vimc_streamer_thread(void *data)
>> {
>> struct vimc_stream *stream = data;
>> - u8 *frame = NULL;
>> + struct vimc_ent_device *ved;
>> + int ret;
>> int i;
>>
>> set_freezable();
>> @@ -136,9 +137,10 @@ static int vimc_streamer_thread(void *data)
>> break;
>>
>> for (i = stream->pipe_size - 1; i >= 0; i--) {
>> - frame = stream->ved_pipeline[i]->process_frame(
>> - stream->ved_pipeline[i], frame);
>> - if (!frame || IS_ERR(frame))
>> + ved = stream->ved_pipeline[i];
>> + ret = ved->process_frame(ved);
>> +
>> + if (ret)
>> break;
>> }
>> //wait for 60hz
>>
>

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