linux-kernel - Re: [PATCH v4 08/17] media: i2c: rdacm21: Add dealy after OV490 reset

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Message-ID: <YHd2bjUlkMjNQEDR@pendragon.ideasonboard.com>
Date:   Thu, 15 Apr 2021 02:10:38 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     kieran.bingham+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/17] media: i2c: rdacm21: Add dealy after OV490 reset

Hi Jacopo,

Thank you for the patch.

On Mon, Apr 12, 2021 at 11:34:42AM +0200, Jacopo Mondi wrote:
> Add a delay after the OV490 chip is put in reset state. The reset
> signal shall be held for at least 250 useconds.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>

With s/dealy/delay/ in the subject line,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/i2c/rdacm21.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c
> index 553e3f03752b..6be8ce130e78 100644
> --- a/drivers/media/i2c/rdacm21.c
> +++ b/drivers/media/i2c/rdacm21.c
> @@ -469,7 +469,10 @@ static int rdacm21_initialize(struct rdacm21_device *dev)
>  	if (ret)
>  		return ret;
>  
> -	/* Enable GPIO1 and hold OV490 in reset during max9271 configuration. */
> +	/*
> +	 * Enable GPIO1 and hold OV490 in reset during max9271 configuration.
> +	 * The reset signal has to be asserted for at least 250 useconds.
> +	 */
>  	ret = max9271_enable_gpios(&dev->serializer, MAX9271_GPIO1OUT);
>  	if (ret)
>  		return ret;
> @@ -477,6 +480,7 @@ static int rdacm21_initialize(struct rdacm21_device *dev)
>  	ret = max9271_clear_gpios(&dev->serializer, MAX9271_GPIO1OUT);
>  	if (ret)
>  		return ret;
> +	usleep_range(250, 500);
>  
>  	ret = max9271_configure_gmsl_link(&dev->serializer);
>  	if (ret)

-- 
Regards,

Laurent Pinchart