linux-kernel - Re: [PATCH 3/6] hantro: Rework how encoder and decoder are identified

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Date:   Fri, 26 Jun 2020 09:58:56 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Ezequiel Garcia <ezequiel@...labora.com>,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     kernel@...labora.com, Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH 3/6] hantro: Rework how encoder and decoder are
 identified

Hi Ezequiel,

On Thu, 2020-06-25 at 13:35 -0300, Ezequiel Garcia wrote:
> So far we've been using the .buf_finish hook to distinguish
> decoder from encoder. This is unnecessarily obfuscated.
> 
> Moreover, we want to move the buf_finish, so use a cleaner
> scheme to distinguish the driver decoder/encoder type.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> ---
>  drivers/staging/media/hantro/hantro.h     | 2 ++
>  drivers/staging/media/hantro/hantro_drv.c | 4 +++-
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/hantro/hantro.h b/drivers/staging/media/hantro/hantro.h
> index 3005207fc6fb..028b788ad50f 100644
> --- a/drivers/staging/media/hantro/hantro.h
> +++ b/drivers/staging/media/hantro/hantro.h
> @@ -199,6 +199,7 @@ struct hantro_dev {
>   *
>   * @dev:		VPU driver data to which the context belongs.
>   * @fh:			V4L2 file handler.
> + * @is_encoder:		Decoder or encoder context?
>   *
>   * @sequence_cap:       Sequence counter for capture queue
>   * @sequence_out:       Sequence counter for output queue
> @@ -223,6 +224,7 @@ struct hantro_dev {
>  struct hantro_ctx {
>  	struct hantro_dev *dev;
>  	struct v4l2_fh fh;
> +	bool is_encoder;
>  
>  	u32 sequence_cap;
>  	u32 sequence_out;
> diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> index 0db8ad455160..112ed556eb90 100644
> --- a/drivers/staging/media/hantro/hantro_drv.c
> +++ b/drivers/staging/media/hantro/hantro_drv.c
> @@ -197,7 +197,7 @@ static void device_run(void *priv)
>  
>  bool hantro_is_encoder_ctx(const struct hantro_ctx *ctx)
>  {
> -	return ctx->buf_finish == hantro_enc_buf_finish;
> +	return ctx->is_encoder;
>  }

Now this function feels a little superfluous. Why not replace
  hantro_is_encoder_ctx(ctx)
with
  ctx->is_encoder
everywhere?

regards
Philipp