From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
mchehab@kernel.org
Cc: linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
linux-kernel@vger.kernel.org,
Kieran Bingham <kieran.bingham@ideasonboard.com>
Subject: Re: [PATCH v2 2/2] media: vsp1: Document max_width restriction on UDS
Date: Fri, 14 Sep 2018 19:56:37 +0300 [thread overview]
Message-ID: <07c61a65-51fd-f01a-2f96-d9eac1e7c098@cogentembedded.com> (raw)
In-Reply-To: <20180914142652.30484-2-kieran.bingham+renesas@ideasonboard.com>
Hello!
On 09/14/2018 05:26 PM, Kieran Bingham wrote:
> The UDS is currently restricted based on a partition size of 256 pixels.
> Document the actual restrictions, but don't increase the implementation.
>
> The extended partition algorithm may later choose to utilise a larger
> partition size to support overlapping partitions which will improve the
> quality of the output images.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
> ---
> drivers/media/platform/vsp1/vsp1_uds.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/media/platform/vsp1/vsp1_uds.c b/drivers/media/platform/vsp1/vsp1_uds.c
> index 75c613050151..e8340de85813 100644
> --- a/drivers/media/platform/vsp1/vsp1_uds.c
> +++ b/drivers/media/platform/vsp1/vsp1_uds.c
> @@ -342,6 +342,14 @@ static unsigned int uds_max_width(struct vsp1_entity *entity,
> UDS_PAD_SOURCE);
> hscale = output->width / input->width;
>
> + /*
> + * The maximum width of the UDS is 304 pixels. These are input pixels
> + * in the event of up-scaling, and output pixels in the event of
> + * downscaling.
> + *
> + * To support overlapping parition windows we clamp at units of 256 and
Partition.
> + * the remaining pixels are reserved.
> + */
> if (hscale <= 2)
> return 256;
> else if (hscale <= 4)
MBR, Sergei
next prev parent reply other threads:[~2018-09-14 16:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-14 14:26 [PATCH v2 1/2] media: vsp1: Document max_width restriction on SRU Kieran Bingham
2018-09-14 14:26 ` [PATCH v2 2/2] media: vsp1: Document max_width restriction on UDS Kieran Bingham
2018-09-14 14:48 ` Laurent Pinchart
2018-09-14 16:56 ` Sergei Shtylyov [this message]
2018-09-14 14:48 ` [PATCH v2 1/2] media: vsp1: Document max_width restriction on SRU Laurent Pinchart
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