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

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Message-ID: <20251209123136.273938-3-isaac.scott@ideasonboard.com>
Date: Tue,  9 Dec 2025 12:31:32 +0000
From: Isaac Scott <isaac.scott@...asonboard.com>
To: dafna@...tmail.com
Cc: laurent.pinchart@...asonboard.com,
	mchehab@...nel.org,
	heiko@...ech.de,
	linux-media@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Isaac Scott <isaac.scott@...asonboard.com>
Subject: [RFC PATCH 2/6] media: rkisp1-isp: Add in_bypass flag for YUV bypass

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.

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    | 6 +++++-
 2 files changed, 6 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..7f0802ae3dcc 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 +242,9 @@ 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) {
+			rkisp1->in_bypass = true;
+		} else if (mbus_type == V4L2_MBUS_CSI2_DPHY) {
 			isp_ctrl = RKISP1_CIF_ISP_CTRL_ISP_MODE_ITU601;
 		} else {
 			if (mbus_type == V4L2_MBUS_BT656)
-- 
2.43.0