Hi Nicolas,
On Thu 09 Nov 23, 16:38, Nicolas Dufresne wrote:
> Le jeudi 09 novembre 2023 à 21:16 +0100, Paul Kocialkowski a écrit :
> > The (TRY_)DECODER_CMD ioctls are used to support flushing when holding capture
> > buffers is supported. This is the case of this driver but the ioctls were never
> > hooked to the ioctl ops.
> >
> > Add them to correctly support flushing.
>
> While this CMD looks useful on paper, we have had no use for it in any
> open source user space. So with this in mind, shall we really enable it
> ? How can we be sure that its actually working as intended ?
Well I think it's part of the spec that it needs to be supportd.
I must admit I have never used it in a real use case either, but it can be fixed
later (without changing the uAPI) if the implementation turns out to be
malfunctioning.
Cheers,
Paul
> > Fixes: 340ce50f75a6 ("media: hantro: Enable HOLD_CAPTURE_BUF for H.264")
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
> > ---
> > drivers/media/platform/verisilicon/hantro_drv.c | 2 ++
> > drivers/media/platform/verisilicon/hantro_v4l2.c | 3 +++
> > 2 files changed, 5 insertions(+)
> >
> > diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
> > index a9fa05ac56a9..3a2a0f28cbfe 100644
> > --- a/drivers/media/platform/verisilicon/hantro_drv.c
> > +++ b/drivers/media/platform/verisilicon/hantro_drv.c
> > @@ -905,6 +905,8 @@ static int hantro_add_func(struct hantro_dev *vpu, unsigned int funcid)
> >
> > if (funcid == MEDIA_ENT_F_PROC_VIDEO_ENCODER) {
> > vpu->encoder = func;
> > + v4l2_disable_ioctl(vfd, VIDIOC_TRY_DECODER_CMD);
> > + v4l2_disable_ioctl(vfd, VIDIOC_DECODER_CMD);
> > } else {
> > vpu->decoder = func;
> > v4l2_disable_ioctl(vfd, VIDIOC_TRY_ENCODER_CMD);
> > diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> > index b3ae037a50f6..db145519fc5d 100644
> > --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> > +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> > @@ -785,6 +785,9 @@ const struct v4l2_ioctl_ops hantro_ioctl_ops = {
> > .vidioc_g_selection = vidioc_g_selection,
> > .vidioc_s_selection = vidioc_s_selection,
> >
> > + .vidioc_decoder_cmd = v4l2_m2m_ioctl_stateless_decoder_cmd,
> > + .vidioc_try_decoder_cmd = v4l2_m2m_ioctl_stateless_try_decoder_cmd,
> > +
> > .vidioc_try_encoder_cmd = v4l2_m2m_ioctl_try_encoder_cmd,
> > .vidioc_encoder_cmd = vidioc_encoder_cmd,
> > };
>
--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
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