linux-kernel - Re: [PATCH v5 4/5] media: platform: mediatek: isp

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Message-ID: <b605fc6a489846ac0c13e6022824f093f61fe126.camel@mediatek.com>
Date: Thu, 18 Jul 2024 03:32:22 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "mchehab@...nel.org" <mchehab@...nel.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "robh@...nel.org" <robh@...nel.org>,
	Andy Hsieh (謝智皓) <Andy.Hsieh@...iatek.com>,
	"jstephan@...libre.com" <jstephan@...libre.com>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "laurent.pinchart@...asonboard.com"
	<laurent.pinchart@...asonboard.com>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, "angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"paul.elder@...asonboard.com" <paul.elder@...asonboard.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "fsylvestre@...libre.com"
	<fsylvestre@...libre.com>, "pnguyen@...libre.com" <pnguyen@...libre.com>
Subject: Re: [PATCH v5 4/5] media: platform: mediatek: isp_30: add mediatek
 ISP3.0 camsv

Hi, Julien:

On Thu, 2024-07-04 at 15:36 +0200, Julien Stephan wrote:
>  	 
> External email : Please do not click links or open attachments until you have verified the sender or the content.
>  From: Phi-bang Nguyen <pnguyen@...libre.com>
> 
> This driver provides a path to bypass the SoC ISP so that image data
> coming from the SENINF can go directly into memory without any image
> processing. This allows the use of an external ISP.
> 
> Signed-off-by: Phi-bang Nguyen <pnguyen@...libre.com>
> Signed-off-by: Florian Sylvestre <fsylvestre@...libre.com>
> [Paul Elder fix irq locking]
> Signed-off-by: Paul Elder <paul.elder@...asonboard.com>
> Co-developed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Co-developed-by: Julien Stephan <jstephan@...libre.com>
> Signed-off-by: Julien Stephan <jstephan@...libre.com>
> ---

[snip]

> +static int mtk_cam_vb2_queue_setup(struct vb2_queue *vq,
> +   unsigned int *num_buffers,
> +   unsigned int *num_planes,
> +   unsigned int sizes[],
> +   struct device *alloc_devs[])
> +{
> +struct mtk_cam_video_device *vdev =
> +vb2_queue_to_mtk_cam_video_device(vq);
> +unsigned int max_buffer_count = vdev->desc->max_buf_count;
> +const struct v4l2_pix_format_mplane *fmt = &vdev->format;
> +unsigned int size;
> +unsigned int np_conf;
> +unsigned int i;
> +
> +/* Check the limitation of buffer size */
> +if (max_buffer_count)

max_buffer_count is always zero, so this checking is redundant.

Regards,
CK

> +*num_buffers = clamp_val(*num_buffers, 1, max_buffer_count);
> +
> +size = fmt->plane_fmt[0].sizeimage;
> +/* Add for q.create_bufs with fmt.g_sizeimage(p) / 2 test */
> +
> +np_conf = 1;
> +
> +if (*num_planes == 0) {
> +*num_planes = np_conf;
> +for (i = 0; i < *num_planes; ++i)
> +sizes[i] = size;
> +} else if (*num_planes != np_conf || sizes[0] < size) {
> +return -EINVAL;
> +}
> +
> +return 0;
> +}
> +