linux-kernel - Re: [PATCH v5 2/2] media: i2c: imx412: Extend the power-on waiting time

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Message-ID: <aXCiTU_hTsBkSJdA@kekkonen.localdomain>
Date: Wed, 21 Jan 2026 11:54:21 +0200
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Wenmeng Liu <wenmeng.liu@....qualcomm.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] media: i2c: imx412: Extend the power-on waiting
 time

Hi Wenmeng,

On Wed, Jan 21, 2026 at 05:12:15PM +0800, Wenmeng Liu wrote:
> The Arducam IMX577 module requires a longer reset time than the 1000µs
> configured in the current driver. Increase the wait time after power-on
> to ensure proper initialization.
> 
> Signed-off-by: Wenmeng Liu <wenmeng.liu@....qualcomm.com>
> ---
>  drivers/media/i2c/imx412.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/imx412.c b/drivers/media/i2c/imx412.c
> index aa63dfc349181bf9c180ffd566b0317d05b410c1..b1c201b4c7d008aa70ac84205e4de119e776047b 100644
> --- a/drivers/media/i2c/imx412.c
> +++ b/drivers/media/i2c/imx412.c
> @@ -1037,7 +1037,7 @@ static int imx412_power_on(struct device *dev)
>  		goto error_reset;
>  	}
>  

Could you please add the comment why this was being done? It's not enough
to have this in the commit message.

> -	usleep_range(1000, 1200);
> +	usleep_range(10000, 12000);
>  
>  	return 0;
>  
> 

-- 
Regards,

Sakari Ailus