linux-kernel - [PATCH v2 1/2] media: rkisp1-isp: Set correct data mode for YUV bypass

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Message-ID: <20260205103207.4020959-2-isaac.scott@ideasonboard.com>
Date: Thu,  5 Feb 2026 10:32:06 +0000
From: Isaac Scott <isaac.scott@...asonboard.com>
To: linux-media@...r.kernel.org
Cc: dafna@...tmail.com,
	laurent.pinchart@...asonboard.com,
	mchehab@...nel.org,
	heiko@...ech.de,
	linux-rockchip@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Isaac Scott <isaac.scott@...asonboard.com>
Subject: [PATCH v2 1/2] media: rkisp1-isp: Set correct data mode 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 must configure the
ISP to expect a YUV input, interpreting H/VSYNC signals as data
enable / disable.

Signed-off-by: Isaac Scott <isaac.scott@...asonboard.com>

---

Changelog since v1:
- Removed in_bypass flag
- Renamed the patch to better represent the functionality of the patch

---
 drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
index 2311672cedb1..21bfa0edbaf1 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
@@ -240,7 +240,9 @@ 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) {
+			isp_ctrl = RKISP1_CIF_ISP_CTRL_ISP_MODE_DATA_MODE;
+		} 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