linux-kernel - Re: [PATCH v1 3/6] media: rkisp1-isp: Add target

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Message-ID: <20260204113710.GA156228@killaraus>
Date: Wed, 4 Feb 2026 13:37:10 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Isaac Scott <isaac.scott@...asonboard.com>
Cc: linux-media@...r.kernel.org, dafna@...tmail.com, mchehab@...nel.org,
	heiko@...ech.de, linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/6] media: rkisp1-isp: Add target_format

On Wed, Feb 04, 2026 at 11:25:03AM +0000, Isaac Scott wrote:
> In passthough mode, we want to make sure the output format of the ISP is
> identical to the input format. Add logic to ensure the format we
> configure the output of the ISP with is the sink format when we are in
> bypass, and the source format if we are not.

I don't think that's right. In bypass mode, userspace needs to configure
the same format on the image sink and image source pads of the ISP, and
not set any cropping. The crop rectangle on the source pad should
contain the information you need.

> Signed-off-by: Isaac Scott <isaac.scott@...asonboard.com>
> ---
>  drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> index f636d738b7e8..716bd7f3c66d 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> @@ -175,9 +175,10 @@ static void rkisp1_gasket_disable(struct rkisp1_device *rkisp1)
>  static void rkisp1_config_ism(struct rkisp1_isp *isp,
>  			      const struct v4l2_subdev_state *sd_state)
>  {
> -	const struct v4l2_rect *src_crop =
> +	const struct v4l2_rect *target_crop =
>  		v4l2_subdev_state_get_crop(sd_state,
> -					   RKISP1_ISP_PAD_SOURCE_VIDEO);
> +			(isp->rkisp1->in_bypass ?
> +				RKISP1_ISP_PAD_SINK_VIDEO : RKISP1_ISP_PAD_SOURCE_VIDEO));
>  	struct rkisp1_device *rkisp1 = isp->rkisp1;
>  	u32 val;
>  
> @@ -185,10 +186,10 @@ static void rkisp1_config_ism(struct rkisp1_isp *isp,
>  	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_MAX_DX, 0);
>  	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_MAX_DY, 0);
>  	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_DISPLACE, 0);
> -	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_H_OFFS, src_crop->left);
> -	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_V_OFFS, src_crop->top);
> -	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_H_SIZE, src_crop->width);
> -	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_V_SIZE, src_crop->height);
> +	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_H_OFFS, target_crop->left);
> +	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_V_OFFS, target_crop->top);
> +	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_H_SIZE, target_crop->width);
> +	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_V_SIZE, target_crop->height);
>  
>  	/* IS(Image Stabilization) is always on, working as output crop */
>  	rkisp1_write(rkisp1, RKISP1_CIF_ISP_IS_CTRL, 1);

-- 
Regards,

Laurent Pinchart