linux-kernel - Re: [PATCH v1 2/6] media: rkisp1-isp: Add in

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Message-ID: <20260204170454.GD170964@killaraus>
Date: Wed, 4 Feb 2026 19:04:54 +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 2/6] media: rkisp1-isp: Add in_bypass flag for YUV
 bypass

Hi Isaac,

Thank you for the patch.

On Wed, Feb 04, 2026 at 11:25:02AM +0000, Isaac Scott wrote:
> The rkisp1 features a 'bypass' mode for RAW and YUV formats. This
> disables all ISP blocks, and makes the rkisp1 display input data from
> the mipi csi receiver at the output, unmodified.
> 
> To determine whether we can activate bypass, we can detect whether both
> the source and sink formats are YUV. If they are, we can set a new
> in_bypass flag.
> 
> For YUV bypass, we should configure the ISP input to interpret incoming
> H/VSYNC signals as data enable / disable. Add this.
> 
> Signed-off-by: Isaac Scott <isaac.scott@...asonboard.com>
> ---
>  drivers/media/platform/rockchip/rkisp1/rkisp1-common.h | 1 +
>  drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c    | 7 ++++++-
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> index 5e6a4d5f6fd1..d90233e31ad3 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> @@ -532,6 +532,7 @@ struct rkisp1_device {
>  	struct rkisp1_debug debug;
>  	const struct rkisp1_info *info;
>  	int irqs[RKISP1_NUM_IRQS];
> +	bool in_bypass;
>  	bool irqs_enabled;
>  };
>  
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> index 2311672cedb1..f636d738b7e8 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> @@ -212,6 +212,8 @@ static int rkisp1_config_isp(struct rkisp1_isp *isp,
>  	const struct v4l2_mbus_framefmt *sink_frm;
>  	const struct v4l2_rect *sink_crop;
>  
> +	rkisp1->in_bypass = false;
> +
>  	sink_frm = v4l2_subdev_state_get_format(sd_state,
>  						RKISP1_ISP_PAD_SINK_VIDEO);
>  	sink_crop = v4l2_subdev_state_get_crop(sd_state,
> @@ -240,7 +242,10 @@ static int rkisp1_config_isp(struct rkisp1_isp *isp,
>  		}
>  	} else if (sink_fmt->pixel_enc == V4L2_PIXEL_ENC_YUV) {
>  		acq_mult = 2;
> -		if (mbus_type == V4L2_MBUS_CSI2_DPHY) {
> +		if (src_fmt->pixel_enc == V4L2_PIXEL_ENC_YUV) {
> +			isp_ctrl = RKISP1_CIF_ISP_CTRL_ISP_MODE_DATA_MODE;
> +			rkisp1->in_bypass = true;

Based on the review of patches 3/6 and 5/6 I think this flag will
become unused, so you can probably drop this patch too.

> +		} else if (mbus_type == V4L2_MBUS_CSI2_DPHY) {
>  			isp_ctrl = RKISP1_CIF_ISP_CTRL_ISP_MODE_ITU601;
>  		} else {
>  			if (mbus_type == V4L2_MBUS_BT656)

-- 
Regards,

Laurent Pinchart