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

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Message-ID: <CAPBb6MUDUs2d+hDRnfg3-7jwqQX8jO1AwjbjyWppE8a64ovvCA@mail.gmail.com>
Date:   Tue, 1 Dec 2020 12:23:57 +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 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.

>  {
> @@ -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,
 };

>         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
>