linux-kernel - Re: [PATCH v2 1/2] media: vsp1: Document max

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Message-ID: <3654115.xQLpRLqA9F@avalon>
Date:   Fri, 14 Sep 2018 17:48:51 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kieran Bingham <kieran.bingham@...asonboard.com>
Subject: Re: [PATCH v2 1/2] media: vsp1: Document max_width restriction on SRU

Hi Kieran,

Thank you for the patch.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

On Friday, 14 September 2018 17:26:51 EEST Kieran Bingham wrote:
> The SRU is currently restricted to 256 pixels as part of the current
> partition algorithm. Document that the actual capability of this
> component is 288 pixels, but don't increase the implementation.
> 
> The extended partition algorithm may later choose to utilise a larger
> input to support overlapping partitions which will improve the quality
> of the output images.
> 
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> ---
>  drivers/media/platform/vsp1/vsp1_sru.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/media/platform/vsp1/vsp1_sru.c
> b/drivers/media/platform/vsp1/vsp1_sru.c index d216707f64c9..19f91eb81134
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_sru.c
> +++ b/drivers/media/platform/vsp1/vsp1_sru.c
> @@ -314,6 +314,11 @@ static unsigned int sru_max_width(struct vsp1_entity
> *entity, output = vsp1_entity_get_pad_format(&sru->entity,
> sru->entity.config, SRU_PAD_SOURCE);
> 
> +	/*
> +	 * The maximum input width of the SRU is 288 input pixels, but 32
> +	 * pixels are reserved to support overlapping partition windows when
> +	 * scaling.
> +	 */
>  	if (input->width != output->width)
>  		return 512;
>  	else


-- 
Regards,

Laurent Pinchart