linux-kernel - Re: [PATCH v3 1/7] media: i2c: imx290: Define standby mode values

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Message-ID: <20240902195529.GP1995@pendragon.ideasonboard.com>
Date: Mon, 2 Sep 2024 22:55:29 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: bbara93@...il.com
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Alexander Stein <alexander.stein@...tq-group.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	Benjamin Bara <benjamin.bara@...data.com>
Subject: Re: [PATCH v3 1/7] media: i2c: imx290: Define standby mode values

Hi Benjamin,

On Mon, Sep 02, 2024 at 05:57:26PM +0200, bbara93@...il.com wrote:
> From: Benjamin Bara <benjamin.bara@...data.com>
> 
> The imx290 datasheet states that the IMX290_STANDBY register has two
> values: 0 for operating and 1 for standby. Define and use them.
> 
> Signed-off-by: Benjamin Bara <benjamin.bara@...data.com>
> ---
> Changes since v2:
> - new, split out from the previous 1/2
> ---
>  drivers/media/i2c/imx290.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> index 4150e6e4b9a6..1c97f9650eb4 100644
> --- a/drivers/media/i2c/imx290.c
> +++ b/drivers/media/i2c/imx290.c
> @@ -29,6 +29,8 @@
>  #include <media/v4l2-subdev.h>
>  
>  #define IMX290_STANDBY					CCI_REG8(0x3000)
> +#define IMX290_STANDBY_OPERATING			0x00
> +#define IMX290_STANDBY_STANDBY				BIT(0)

The convention, for single-bit fields, is to define a macro to describe
the bit, but not a macro to describe the bit not being set.

>  #define IMX290_REGHOLD					CCI_REG8(0x3001)
>  #define IMX290_XMSTA					CCI_REG8(0x3002)
>  #define IMX290_ADBIT					CCI_REG8(0x3005)
> @@ -1016,7 +1018,8 @@ static int imx290_start_streaming(struct imx290 *imx290,
>  		return ret;
>  	}
>  
> -	cci_write(imx290->regmap, IMX290_STANDBY, 0x00, &ret);
> +	cci_write(imx290->regmap, IMX290_STANDBY, IMX290_STANDBY_OPERATING,
> +		  &ret);

I would thus rather drop this change.

>  
>  	msleep(30);
>  
> @@ -1029,7 +1032,7 @@ static int imx290_stop_streaming(struct imx290 *imx290)
>  {
>  	int ret = 0;
>  
> -	cci_write(imx290->regmap, IMX290_STANDBY, 0x01, &ret);
> +	cci_write(imx290->regmap, IMX290_STANDBY, IMX290_STANDBY_STANDBY, &ret);

And keep this one.

>  
>  	msleep(30);
>  

-- 
Regards,

Laurent Pinchart