linux-kernel - Re: [PATCH] venus: venc: Add VIDIOC_TRY_ENCODER

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Date:   Tue, 1 Dec 2020 13:17:03 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Fritz Koenig <frkoenig@...omium.org>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Vikash Garodia <vgarodia@...eaurora.org>,
        Dikshita Agarwal <dikshita@...eaurora.org>
Subject: Re: [PATCH] venus: venc: Add VIDIOC_TRY_ENCODER_CMD support

On Tue, Dec 1, 2020 at 1:07 PM Fritz Koenig <frkoenig@...omium.org> wrote:
>
> On Mon, Nov 30, 2020 at 7:24 PM Alexandre Courbot <acourbot@...omium.org> wrote:
> >
> > On Sun, Nov 29, 2020 at 3:05 PM Fritz Koenig <frkoenig@...omium.org> wrote:
> > >
> > > V4L2_ENC_CMD_STOP and V4L2_ENC_CMD_START are already
> > > supported.  Add a way to query for support.
> >
> > I think your Signed-off-by is missing (checkpatch.pl should warn you
> > about such problems).
> >
> > >
> > > ---
> > >  drivers/media/platform/qcom/venus/venc.c | 26 ++++++++++++++++++++++++
> > >  1 file changed, 26 insertions(+)
> > >
> > > diff --git a/drivers/media/platform/qcom/venus/venc.c b/drivers/media/platform/qcom/venus/venc.c
> > > index 2ddfeddf98514..e05db3c4bfb24 100644
> > > --- a/drivers/media/platform/qcom/venus/venc.c
> > > +++ b/drivers/media/platform/qcom/venus/venc.c
> > > @@ -507,6 +507,27 @@ static int venc_enum_frameintervals(struct file *file, void *fh,
> > >         return 0;
> > >  }
> > >
> > > +static int
> > > +venc_try_encoder_cmd(struct file *file, void *fh, struct v4l2_encoder_cmd *cmd)
> > > +{
> > > +       struct venus_inst *inst = to_inst(file);
> > > +       struct device *dev = inst->core->dev_dec;
> > > +
> > > +       switch (cmd->cmd) {
> > > +       case V4L2_ENC_CMD_STOP:
> > > +       case V4L2_ENC_CMD_START:
> > > +               if (cmd->flags != 0) {
> > > +                       dev_dbg(dev, "flags=%u are not supported", cmd->flags);
> > > +                       return -EINVAL;
> > > +               }
> > > +               break;
> > > +       default:
> > > +               return -EINVAL;
> > > +       }
> > > +
> > > +       return 0;
> > > +}
> > > +
> > >  static int
> > >  venc_encoder_cmd(struct file *file, void *fh, struct v4l2_encoder_cmd *cmd)
> >
> > I am not seeing venc_encoder_cmd() in the media tree, does this patch
> > depend on others that are not yet merged? If so they should be
> > submitted together as a series.
> >
>
> Sorry, I'm still a little unsure of procedures here.  There is another
> patch set[1] posted
> and I thought it was missing this part.  It turns out I had not
> applied the whole set to
> my tree.
>
> > >  {
> > > @@ -514,6 +535,10 @@ venc_encoder_cmd(struct file *file, void *fh, struct v4l2_encoder_cmd *cmd)
> > >         struct hfi_frame_data fdata = {0};
> > >         int ret = 0;
> > >
> > > +       ret = venc_try_encoder_cmd(file, fh, cmd);
> > > +       if (ret < 0)
> > > +               return ret;
> > > +
> >
> > v4l2_m2m_ioctl_try_encoder_cmd() is called right below, and AFAICT
> > does the same thing as the newly-defined venc_try_encoder_cmd(). So
> > IIUC this patch can be turned into a one-liner that does just the
> > following:
> >
> > @@ -575,6 +600,7 @@ static const struct v4l2_ioctl_ops venc_ioctl_ops = {
> >         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> >         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> >         .vidioc_encoder_cmd = venc_encoder_cmd,
> > +       .vidioc_try_encoder_cmd = v4l2_m2m_ioctl_try_encoder_cmd,
> >  };
> >
> Yes, that's how it is in the current patch[2], which is why I may have
> missed it.
> (I'm embarrassed because I reviewed that patch and then posted mine.)

Ah, ack - no worries, I am also far from being on top of everything
and missed the connection with that patchset. :)

I guess we can drop this one then.

>
> > >         ret = v4l2_m2m_ioctl_try_encoder_cmd(file, fh, cmd);
> > >         if (ret)
> > >                 return ret;
> > > @@ -575,6 +600,7 @@ static const struct v4l2_ioctl_ops venc_ioctl_ops = {
> > >         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
> > >         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> > >         .vidioc_encoder_cmd = venc_encoder_cmd,
> > > +       .vidioc_try_encoder_cmd = venc_try_encoder_cmd,
> > >  };
> > >
> > >  static int venc_set_properties(struct venus_inst *inst)
> > > --
> > > 2.29.2.454.gaff20da3a2-goog
> > >
>
> [1] : https://patchwork.kernel.org/project/linux-media/list/?series=382113
> [2]: https://patchwork.kernel.org/project/linux-media/patch/20201111143755.24541-7-stanimir.varbanov@linaro.org/