linux-kernel - Re: [PATCH v1 03/10] media: platform: mediatek: add isp

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Message-ID: <b9fc24079c2004ed15ce7206298bd1dd41896f9a.camel@mediatek.com>
Date: Wed, 20 Nov 2024 06:35:52 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
	"christian.koenig@....com" <christian.koenig@....com>, "mchehab@...nel.org"
	<mchehab@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"robh@...nel.org" <robh@...nel.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Shu-hsiang Yang (楊舒翔)
	<Shu-hsiang.Yang@...iatek.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"yunkec@...omium.org" <yunkec@...omium.org>, "linaro-mm-sig@...ts.linaro.org"
	<linaro-mm-sig@...ts.linaro.org>, "linux-media@...r.kernel.org"
	<linux-media@...r.kernel.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, Yaya Chang (張雅清)
	<Yaya.Chang@...iatek.com>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Teddy Chen (陳乾元) <Teddy.Chen@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "hidenorik@...omium.org"
	<hidenorik@...omium.org>, Shun-Yi Wang (王順億)
	<Shun-Yi.Wang@...iatek.com>
Subject: Re: [PATCH v1 03/10] media: platform: mediatek: add isp_7x seninf
 unit

Hi, Shu-hsiang:

On Wed, 2024-10-09 at 19:15 +0800, Shu-hsiang Yang wrote:
> Introduces the driver of the MediaTek Sensor Interface,
> focusing on integration with the MediaTek ISP CAMSYS. The
> seninf device bridges camera sensors and the ISP system,
> providing management for sensor data routing and processing.
> Key features include V4L2 framework control, and dynamic
> handling of stream configurations and virtual channels.
> 
> Signed-off-by: Shu-hsiang Yang <Shu-hsiang.Yang@...iatek.com>
> ---

[snip]

> +struct seninf_mux *mtk_cam_seninf_mux_get_pref(struct seninf_ctx *ctx,
> +					       int *pref_idx, int pref_cnt)
> +{
> +	int i;
> +	struct seninf_core *core = ctx->core;
> +	struct seninf_mux *ent = NULL;
> +
> +	mutex_lock(&core->mutex);
> +
> +	list_for_each_entry(ent, &core->list_mux, list) {
> +		for (i = 0; i < pref_cnt; i++) {
> +			if (ent->idx == pref_idx[i]) {

There is only two place to call mtk_cam_seninf_mux_get_pref(), and both place just make sure that pref_idx[i] = i.
So it's not necessary to pass an array as parameter. This code could be

if (ent->idx == i) {
   ...
}

Regards,
CK

> +				list_move_tail(&ent->list, &ctx->list_mux);
> +				mutex_unlock(&core->mutex);
> +				return ent;
> +			}
> +		}
> +	}
> +
> +	mutex_unlock(&core->mutex);
> +
> +	return mtk_cam_seninf_mux_get(ctx);
> +}
> +