linux-kernel - Re: [PATCH] media: i2c: improve suspend/resume switch performance for GT9769 VCM driver

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Message-ID: <40de250a3a516110119e451251bf7b5e9a76818d.camel@mediatek.com>
Date: Thu, 19 Sep 2024 08:10:22 +0000
From: Zhi Mao (毛智) <zhi.mao@...iatek.com>
To: "matthias.bgg@...il.com" <matthias.bgg@...il.com>, "mchehab@...nel.org"
	<mchehab@...nel.org>, "sakari.ailus@...ux.intel.com"
	<sakari.ailus@...ux.intel.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>, "linux-media@...r.kernel.org"
	<linux-media@...r.kernel.org>,
	Shengnan Wang (王圣男)
	<shengnan.wang@...iatek.com>, Yaya Chang (張雅清)
	<Yaya.Chang@...iatek.com>, "10572168@...com" <10572168@...com>,
	Teddy Chen (陳乾元) <Teddy.Chen@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
	Xiaofeiw Wang (王小飞)
	<ot_xiaofeiw.wang@...iatek.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH] media: i2c: improve suspend/resume switch performance for
 GT9769 VCM driver

ping...

On Sat, 2024-08-31 at 13:52 +0800, Zhi Mao wrote:
> Chromebook camera AP can switch between video and photo mode,
> the behavior corresponding to VCM is suspend and resume,
> it will cause camera preview is not smooth during switching
> operation.
> We use autosuspend function can fix this issue.
> 
> Signed-off-by: Zhi Mao <zhi.mao@...iatek.com>
> ---
>  drivers/media/i2c/dw9768.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/dw9768.c b/drivers/media/i2c/dw9768.c
> index 18ef2b35c9aa..7449d29df901 100644
> --- a/drivers/media/i2c/dw9768.c
> +++ b/drivers/media/i2c/dw9768.c
> @@ -374,7 +374,7 @@ static int dw9768_open(struct v4l2_subdev *sd,
> struct v4l2_subdev_fh *fh)
>  
>  static int dw9768_close(struct v4l2_subdev *sd, struct
> v4l2_subdev_fh *fh)
>  {
> -	pm_runtime_put(sd->dev);
> +	pm_runtime_put_sync_autosuspend(sd->dev);
>  
>  	return 0;
>  }
> @@ -490,6 +490,7 @@ static int dw9768_probe(struct i2c_client
> *client)
>  		goto err_power_off;
>  	}
>  
> +	pm_runtime_use_autosuspend(dev);
>  	pm_runtime_idle(dev);
>  
>  	return 0;