linux-kernel - Re: [PATCH v2 1/4] media: rkvdec: Add an ops to check for decode errors

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Message-ID: <Y6odDbRNY7g+eKag@eze-laptop>
Date:   Mon, 26 Dec 2022 19:15:41 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel@...labora.com, linux-media@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] media: rkvdec: Add an ops to check for decode
 errors

Hi Nicolas,

Thanks for the patch.

On Fri, Dec 23, 2022 at 02:38:03PM -0500, Nicolas Dufresne wrote:
> This optional internal ops allow each codec to do their own
> error status checking. The presence of an error is reported
> using the ERROR buffer state. This patch have no functional
> changes.
> 
> Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
> ---
>  drivers/staging/media/rkvdec/rkvdec.c | 10 ++++++----
>  drivers/staging/media/rkvdec/rkvdec.h |  2 ++
>  2 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index 7bab7586918c1..7e76f8b728854 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -950,6 +950,7 @@ static void rkvdec_v4l2_cleanup(struct rkvdec_dev *rkvdec)
>  static irqreturn_t rkvdec_irq_handler(int irq, void *priv)
>  {
>  	struct rkvdec_dev *rkvdec = priv;
> +	struct rkvdec_ctx *ctx;
>  	enum vb2_buffer_state state;
>  	u32 status;
>  
> @@ -958,12 +959,13 @@ static irqreturn_t rkvdec_irq_handler(int irq, void *priv)
>  		VB2_BUF_STATE_DONE : VB2_BUF_STATE_ERROR;
>  
>  	writel(0, rkvdec->regs + RKVDEC_REG_INTERRUPT);
> -	if (cancel_delayed_work(&rkvdec->watchdog_work)) {
> -		struct rkvdec_ctx *ctx;
> +	ctx = v4l2_m2m_get_curr_priv(rkvdec->m2m_dev);
>  
> -		ctx = v4l2_m2m_get_curr_priv(rkvdec->m2m_dev);
> +	if (ctx->coded_fmt_desc->ops->check_error_info)
> +		state = ctx->coded_fmt_desc->ops->check_error_info(ctx);
> +
> +	if (cancel_delayed_work(&rkvdec->watchdog_work))
>  		rkvdec_job_finish(ctx, state);
> -	}
>  
>  	return IRQ_HANDLED;
>  }
> diff --git a/drivers/staging/media/rkvdec/rkvdec.h b/drivers/staging/media/rkvdec/rkvdec.h
> index 633335ebb9c49..4ae8e6c6b03c9 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.h
> +++ b/drivers/staging/media/rkvdec/rkvdec.h
> @@ -73,6 +73,8 @@ struct rkvdec_coded_fmt_ops {
>  		     struct vb2_v4l2_buffer *dst_buf,
>  		     enum vb2_buffer_state result);
>  	int (*try_ctrl)(struct rkvdec_ctx *ctx, struct v4l2_ctrl *ctrl);
> +	/* called from IRQ handler */
> +	int (*check_error_info)(struct rkvdec_ctx *ctx);

I don't think it's a good idea to mix the return of this internal API
with enum vb2_buffer_state.

Please make the return type of this function a boolean or an integer
type that is decoupled from the VB2 buffer state.

Thanks!
Ezequiel

>  };
>  
>  struct rkvdec_coded_fmt_desc {
> -- 
> 2.38.1
>