linux-kernel - Re: [PATCH v2 4/8] media: vidc: encoder: add video encoder files

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Date:   Mon, 19 Sep 2016 12:15:01 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 4/8] media: vidc: encoder: add video encoder files

Many of my review comments for the decoder apply to the encoder as well,
so I won't repeat those.

On 09/07/2016 01:37 PM, Stanimir Varbanov wrote:
> This adds encoder part of the driver plus encoder controls.
> 
> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> ---
>  drivers/media/platform/qcom/vidc/venc.c       | 1252 +++++++++++++++++++++++++
>  drivers/media/platform/qcom/vidc/venc.h       |   29 +
>  drivers/media/platform/qcom/vidc/venc_ctrls.c |  396 ++++++++
>  drivers/media/platform/qcom/vidc/venc_ctrls.h |   23 +
>  4 files changed, 1700 insertions(+)
>  create mode 100644 drivers/media/platform/qcom/vidc/venc.c
>  create mode 100644 drivers/media/platform/qcom/vidc/venc.h
>  create mode 100644 drivers/media/platform/qcom/vidc/venc_ctrls.c
>  create mode 100644 drivers/media/platform/qcom/vidc/venc_ctrls.h
> 
> diff --git a/drivers/media/platform/qcom/vidc/venc.c b/drivers/media/platform/qcom/vidc/venc.c
> new file mode 100644
> index 000000000000..3b65f851a807
> --- /dev/null
> +++ b/drivers/media/platform/qcom/vidc/venc.c
> @@ -0,0 +1,1252 @@

<snip>

> +static int venc_s_selection(struct file *file, void *fh,
> +			    struct v4l2_selection *s)
> +{
> +	return -EINVAL;
> +}

Huh? Either remove this, or implement this correctly.

<snip>

> +static int venc_subscribe_event(struct v4l2_fh *fh,
> +				const struct  v4l2_event_subscription *sub)
> +{
> +	switch (sub->type) {
> +	case V4L2_EVENT_EOS:
> +		return v4l2_event_subscribe(fh, sub, 2, NULL);
> +	case V4L2_EVENT_SOURCE_CHANGE:
> +		return v4l2_src_change_event_subscribe(fh, sub);

These two events aren't used in this driver AFAICT, so this can be dropped.

Since that leaves just V4L2_EVENT_CTRL this function can be replaced by
v4l2_ctrl_subscribe_event().

Regards,

	Hans


> +	case V4L2_EVENT_CTRL:
> +		return v4l2_ctrl_subscribe_event(fh, sub);
> +	default:
> +		return -EINVAL;
> +	}
> +}