[PATCH 4/4] media: staging/ipu7: Add monochrome pixel formats
From: Ruslan Koreev
Date: Thu Sep 24 2026 - 14:24:40 EST
The CSI-2 receiver already accepts MEDIA_BUS_FMT_Y10_1X10 but the video
nodes offer no pixel format for it, and MEDIA_BUS_FMT_Y8_1X8 is not
accepted at all, so a monochrome sensor cannot stream through the IPU7:
the ST VD55G1 IR camera of the Lenovo ThinkPad X1 Carbon Gen 14 only
produces Y8 and Y10 and no configuration can be negotiated for it.
Add the GREY, Y10 and Y10P pixel formats, mapped to the RAW8, RAW16
and RAW10 frame formats like their Bayer counterparts, and accept
MEDIA_BUS_FMT_Y8_1X8 on the CSI-2 receiver with the RAW8 data type.
ipu7_isys_is_bayer_format() treats every raw code as Bayer, so the mono
codes take the raw path in the CSI-2 cropping code; leave them alone in
ipu7_isys_convert_bayer_order(), which otherwise warns about them. The
two parts belong together: with the mono codes exposed but not excluded
there, any crop offset on a mono stream triggers the warning.
Tested with the VD55G1 on that laptop: libcamera negotiates Y8 and
streams 804x704 at 58 fps, and Y10 and Y10P stream with plain V4L2.
Signed-off-by: Ruslan Koreev <koreev.r@xxxxxxxxx>
---
drivers/staging/media/ipu7/ipu7-isys-csi2.c | 1 +
drivers/staging/media/ipu7/ipu7-isys-subdev.c | 5 +++++
drivers/staging/media/ipu7/ipu7-isys-video.c | 6 ++++++
3 files changed, 12 insertions(+)
diff --git a/drivers/staging/media/ipu7/ipu7-isys-csi2.c b/drivers/staging/media/ipu7/ipu7-isys-csi2.c
index f34eabfe8..3067ae942 100644
--- a/drivers/staging/media/ipu7/ipu7-isys-csi2.c
+++ b/drivers/staging/media/ipu7/ipu7-isys-csi2.c
@@ -27,6 +27,7 @@
#include "ipu7-isys-csi-phy.h"
static const u32 csi2_supported_codes[] = {
+ MEDIA_BUS_FMT_Y8_1X8,
MEDIA_BUS_FMT_Y10_1X10,
MEDIA_BUS_FMT_RGB565_1X16,
MEDIA_BUS_FMT_RGB888_1X24,
diff --git a/drivers/staging/media/ipu7/ipu7-isys-subdev.c b/drivers/staging/media/ipu7/ipu7-isys-subdev.c
index 67a776033..10908383b 100644
--- a/drivers/staging/media/ipu7/ipu7-isys-subdev.c
+++ b/drivers/staging/media/ipu7/ipu7-isys-subdev.c
@@ -42,6 +42,7 @@ unsigned int ipu7_isys_mbus_code_to_mipi(u32 code)
case MEDIA_BUS_FMT_SGRBG10_1X10:
case MEDIA_BUS_FMT_SRGGB10_1X10:
return MIPI_CSI2_DT_RAW10;
+ case MEDIA_BUS_FMT_Y8_1X8:
case MEDIA_BUS_FMT_SBGGR8_1X8:
case MEDIA_BUS_FMT_SGBRG8_1X8:
case MEDIA_BUS_FMT_SGRBG8_1X8:
@@ -88,6 +89,10 @@ u32 ipu7_isys_convert_bayer_order(u32 code, int x, int y)
};
unsigned int i;
+ /* Monochrome raw formats have no Bayer order to convert */
+ if (code == MEDIA_BUS_FMT_Y8_1X8 || code == MEDIA_BUS_FMT_Y10_1X10)
+ return code;
+
for (i = 0; i < ARRAY_SIZE(code_map); i++)
if (code_map[i] == code)
break;
diff --git a/drivers/staging/media/ipu7/ipu7-isys-video.c b/drivers/staging/media/ipu7/ipu7-isys-video.c
index 8c6730833..c9abd4560 100644
--- a/drivers/staging/media/ipu7/ipu7-isys-video.c
+++ b/drivers/staging/media/ipu7/ipu7-isys-video.c
@@ -54,6 +54,8 @@ const struct ipu7_isys_pixelformat ipu7_isys_pfmts[] = {
IPU_INSYS_FRAME_FORMAT_RAW16},
{V4L2_PIX_FMT_SRGGB10, 16, 10, MEDIA_BUS_FMT_SRGGB10_1X10,
IPU_INSYS_FRAME_FORMAT_RAW16},
+ {V4L2_PIX_FMT_Y10, 16, 10, MEDIA_BUS_FMT_Y10_1X10,
+ IPU_INSYS_FRAME_FORMAT_RAW16},
{V4L2_PIX_FMT_SBGGR8, 8, 8, MEDIA_BUS_FMT_SBGGR8_1X8,
IPU_INSYS_FRAME_FORMAT_RAW8},
{V4L2_PIX_FMT_SGBRG8, 8, 8, MEDIA_BUS_FMT_SGBRG8_1X8,
@@ -62,6 +64,8 @@ const struct ipu7_isys_pixelformat ipu7_isys_pfmts[] = {
IPU_INSYS_FRAME_FORMAT_RAW8},
{V4L2_PIX_FMT_SRGGB8, 8, 8, MEDIA_BUS_FMT_SRGGB8_1X8,
IPU_INSYS_FRAME_FORMAT_RAW8},
+ {V4L2_PIX_FMT_GREY, 8, 8, MEDIA_BUS_FMT_Y8_1X8,
+ IPU_INSYS_FRAME_FORMAT_RAW8},
{V4L2_PIX_FMT_SBGGR12P, 12, 12, MEDIA_BUS_FMT_SBGGR12_1X12,
IPU_INSYS_FRAME_FORMAT_RAW12},
{V4L2_PIX_FMT_SGBRG12P, 12, 12, MEDIA_BUS_FMT_SGBRG12_1X12,
@@ -78,6 +82,8 @@ const struct ipu7_isys_pixelformat ipu7_isys_pfmts[] = {
IPU_INSYS_FRAME_FORMAT_RAW10},
{V4L2_PIX_FMT_SRGGB10P, 10, 10, MEDIA_BUS_FMT_SRGGB10_1X10,
IPU_INSYS_FRAME_FORMAT_RAW10},
+ {V4L2_PIX_FMT_Y10P, 10, 10, MEDIA_BUS_FMT_Y10_1X10,
+ IPU_INSYS_FRAME_FORMAT_RAW10},
{V4L2_PIX_FMT_UYVY, 16, 16, MEDIA_BUS_FMT_UYVY8_1X16,
IPU_INSYS_FRAME_FORMAT_UYVY},
{V4L2_PIX_FMT_YUYV, 16, 16, MEDIA_BUS_FMT_YUYV8_1X16,
--
2.55.0