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

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Date:   Mon, 30 Nov 2020 20:06:47 -0800
From:   Fritz Koenig <frkoenig@...omium.org>
To:     Alexandre Courbot <acourbot@...omium.org>
Cc:     Fritz Koenig <frkoenig@...omium.org>,
        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 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.)

> >         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/