[PATCH v4 10/14] media: uapi: Add controls for ST DCMIPP Driver
From: Alain Volmat <alain.volmat@foss.st.com>
Date: 2026-08-20 07:23:24
Also in:
linux-media, lkml
Subsystem:
media input infrastructure (v4l/dvb), the rest · Maintainers:
Mauro Carvalho Chehab, Linus Torvalds
Add definitions and documentation for the custom control provided by the DCMIPP driver in order to control the pixelproc gamma correction. Signed-off-by: Alain Volmat <alain.volmat@foss.st.com> --- Documentation/userspace-api/media/drivers/dcmipp.rst | 14 ++++++++++++++ Documentation/userspace-api/media/drivers/index.rst | 1 + include/uapi/linux/media/st/dcmipp_config.h | 16 ++++++++++++++++ include/uapi/linux/v4l2-controls.h | 6 ++++++ 4 files changed, 37 insertions(+)
diff --git a/Documentation/userspace-api/media/drivers/dcmipp.rst b/Documentation/userspace-api/media/drivers/dcmipp.rst
new file mode 100644
index 0000000000000..ed4272da4b68b
--- /dev/null
+++ b/Documentation/userspace-api/media/drivers/dcmipp.rst@@ -0,0 +1,14 @@ +.. SPDX-License-Identifier: GPL-2.0-only + +ST DCMIPP driver +================ + +The ST DCMIPP driver implements a driver specific control as part of its +pixelproc subdev. + +``V4L2_CID_DCMIPP_PIXELPROC_GAMMA_CORRECTION_ENABLE (boolean)`` + Enable / disable the gamma correction block. + + The DCMIPP PixelProc stage implements a gamma compression on each R, G, B + component, using a static gamma exponent 2.2. + The gamma is implemented as a 7-segment linear curve.
diff --git a/Documentation/userspace-api/media/drivers/index.rst b/Documentation/userspace-api/media/drivers/index.rst
index 02967c9b18d6e..8d2c489b8453e 100644
--- a/Documentation/userspace-api/media/drivers/index.rst
+++ b/Documentation/userspace-api/media/drivers/index.rst@@ -30,6 +30,7 @@ For more details see the file COPYING in the source distribution of Linux. camera-sensor ccs cx2341x-uapi + dcmipp dw100 imx-uapi mali-c55
diff --git a/include/uapi/linux/media/st/dcmipp_config.h b/include/uapi/linux/media/st/dcmipp_config.h
new file mode 100644
index 0000000000000..ad8d146820eab
--- /dev/null
+++ b/include/uapi/linux/media/st/dcmipp_config.h@@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * ST DCMIPP Driver - Userspace API + * + * Copyright (C) STMicroelectronics SA 2026 + */ + +#ifndef __UAPI_DCMIPP_CONFIG_H +#define __UAPI_DCMIPP_CONFIG_H + +#include <linux/types.h> +#include <linux/v4l2-controls.h> + +#define V4L2_CID_DCMIPP_PIXELPROC_GAMMA_CORRECTION_ENABLE (V4L2_CID_USER_DCMIPP_BASE + 0x0) + +#endif /* __UAPI_DCMIPP_CONFIG_H */
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index affec0ab47815..42b4f82afeb8c 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h@@ -234,6 +234,12 @@ enum v4l2_colorfx { */ #define V4L2_CID_USER_MALI_C55_BASE (V4L2_CID_USER_BASE + 0x1230) +/* + * The base for the ST DCMIPP driver controls. + * We reserve 16 controls for this driver + */ +#define V4L2_CID_USER_DCMIPP_BASE (V4L2_CID_USER_BASE + 0x1240) + /* MPEG-class control IDs */ /* The MPEG controls are applicable to all codec controls * and the 'MPEG' part of the define is historical */
--
2.34.1