linux-kernel - Re: [PATCH v2 1/4] media: i2c: imx290: Limit analogue gain according to module

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Message-ID: <4950196.GXAFRqVoOG@steina-w>
Date: Thu, 05 Dec 2024 16:22:22 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Sakari Ailus <sakari.ailus@...ux.intel.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Laurent Pinchart <laurent.pinchart@...asonboard.com>, Dave Stevenson <dave.stevenson@...pberrypi.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH v2 1/4] media: i2c: imx290: Limit analogue gain according to module

Hi Dave,

Am Mittwoch, 20. November 2024, 20:17:03 CET schrieb Dave Stevenson:
> The imx327 only supports up to 29.4dB of analogue gain, vs
> the imx290 going up to 30dB. Both are in 0.3dB steps.

While I agree for 30dB on imx290, my (maybe outdated) Rev0.2 datasheet says
up to 27dB in 0.3dB steps.

Despite that this change looks good.

Best regards,
Alexander

> As we now have model specific config, fix this mismatch,
> and delete the comment referencing it.
> 
> Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> ---
>  drivers/media/i2c/imx290.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx290.c b/drivers/media/i2c/imx290.c
> index ee698c99001d..da654deb444a 100644
> --- a/drivers/media/i2c/imx290.c
> +++ b/drivers/media/i2c/imx290.c
> @@ -176,6 +176,7 @@ struct imx290_model_info {
>  	enum imx290_colour_variant colour_variant;
>  	const struct cci_reg_sequence *init_regs;
>  	size_t init_regs_num;
> +	unsigned int max_analog_gain;
>  	const char *name;
>  };
>  
> @@ -876,14 +877,10 @@ static int imx290_ctrl_init(struct imx290 *imx290)
>  	 * up to 72.0dB (240) add further digital gain. Limit the range to
>  	 * analog gain only, support for digital gain can be added separately
>  	 * if needed.
> -	 *
> -	 * The IMX327 and IMX462 are largely compatible with the IMX290, but
> -	 * have an analog gain range of 0.0dB to 29.4dB and 42dB of digital
> -	 * gain. When support for those sensors gets added to the driver, the
> -	 * gain control should be adjusted accordingly.
>  	 */
>  	v4l2_ctrl_new_std(&imx290->ctrls, &imx290_ctrl_ops,
> -			  V4L2_CID_ANALOGUE_GAIN, 0, 100, 1, 0);
> +			  V4L2_CID_ANALOGUE_GAIN, 0,
> +			  imx290->model->max_analog_gain, 1, 0);
>  
>  	/*
>  	 * Correct range will be determined through imx290_ctrl_update setting
> @@ -1441,18 +1438,21 @@ static const struct imx290_model_info imx290_models[] = {
>  		.colour_variant = IMX290_VARIANT_COLOUR,
>  		.init_regs = imx290_global_init_settings_290,
>  		.init_regs_num = ARRAY_SIZE(imx290_global_init_settings_290),
> +		.max_analog_gain = 100,
>  		.name = "imx290",
>  	},
>  	[IMX290_MODEL_IMX290LLR] = {
>  		.colour_variant = IMX290_VARIANT_MONO,
>  		.init_regs = imx290_global_init_settings_290,
>  		.init_regs_num = ARRAY_SIZE(imx290_global_init_settings_290),
> +		.max_analog_gain = 100,
>  		.name = "imx290",
>  	},
>  	[IMX290_MODEL_IMX327LQR] = {
>  		.colour_variant = IMX290_VARIANT_COLOUR,
>  		.init_regs = imx290_global_init_settings_327,
>  		.init_regs_num = ARRAY_SIZE(imx290_global_init_settings_327),
> +		.max_analog_gain = 98,
>  		.name = "imx327",
>  	},
>  };
> 
> 


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