linux-kernel - Re: [PATCH] media: meson: vdec: esparser: check parsing state with hardware write pointer

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Date:   Mon, 23 Jan 2023 10:47:56 +0100
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Christian Hewitt <christianshewitt@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-media@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [PATCH] media: meson: vdec: esparser: check parsing state with
 hardware write pointer

On 23/01/2023 10:43, Christian Hewitt wrote:
> From: Neil Armstrong <narmstrong@...libre.com>
> 
> Also check the hardware write pointer to check if ES Parser has stalled.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
> ---
>   drivers/staging/media/meson/vdec/esparser.c | 15 +++++++++++----
>   1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/media/meson/vdec/esparser.c b/drivers/staging/media/meson/vdec/esparser.c
> index df5956c6141d..41b705f999b2 100644
> --- a/drivers/staging/media/meson/vdec/esparser.c
> +++ b/drivers/staging/media/meson/vdec/esparser.c
> @@ -300,6 +300,7 @@ esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
>   	u32 num_dst_bufs = 0;
>   	u32 offset;
>   	u32 pad_size;
> +	u32 wp, wp2;
>   
>   	/*
>   	 * When max ref frame is held by VP9, this should be -= 3 to prevent a
> @@ -354,15 +355,21 @@ esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
>   	}
>   
>   	pad_size = esparser_pad_start_code(core, vb, payload_size);
> +	wp = amvdec_read_parser(core, PARSER_VIDEO_WP);
>   	ret = esparser_write_data(core, phy, payload_size + pad_size);
> +	wp2 = amvdec_read_parser(core, PARSER_VIDEO_WP);
>   
>   	if (ret <= 0) {
> -		dev_warn(core->dev, "esparser: input parsing error\n");
> -		amvdec_remove_ts(sess, vb->timestamp);
> -		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
>   		amvdec_write_parser(core, PARSER_FETCH_CMD, 0);
>   
> -		return 0;
> +		if (ret < 0 || wp2 == wp) {
> +			dev_err(core->dev, "esparser: input parsing error ret %d (%x <=> %x)\n",
> +				ret, wp, wp2);
> +			amvdec_remove_ts(sess, vb->timestamp);
> +			v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
> +
> +			return 0;
> +		}
>   	}
>   
>   	atomic_inc(&sess->esparser_queued_bufs);

It's weird, but:

Acked-by: Neil Armstrong <neil.armstrong@...aro.org>

Thanks Christian for handling those changes

Neil