[PATCH v12 04/15] media: uapi: Add controls for Mali-C55 ISP
Lad, Prabhakar
prabhakar.csengg at gmail.com
Tue Oct 28 11:25:17 PDT 2025
On Thu, Oct 2, 2025 at 11:19 AM Daniel Scally
<dan.scally at ideasonboard.com> wrote:
>
> Add definitions and documentation for the custom control that will
> be needed by the Mali-C55 ISP driver. This will be a read only
> bitmask of the driver's capabilities, informing userspace of which
> blocks are fitted and which are absent.
>
> Signed-off-by: Daniel Scally <dan.scally at ideasonboard.com>
> ---
> Changes in v12:
>
> - Removed _FITTED suffix from control value names
> - Specified bitmask for control name
> - Used (1 << n) instead of BIT(n) in uapi header
> - Updated comment to reserve 16 controls for driver
>
> Changes in v11:
>
> - None
> Changes in v10:
>
> - None
>
> Changes in v9:
>
> - New patch
> ---
> .../userspace-api/media/drivers/index.rst | 1 +
> .../userspace-api/media/drivers/mali-c55.rst | 55 ++++++++++++++++++++++
> include/uapi/linux/media/arm/mali-c55-config.h | 26 ++++++++++
> include/uapi/linux/v4l2-controls.h | 6 +++
> 4 files changed, 88 insertions(+)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj at bp.renesas.com>
Cheers,
Prabhakar
> diff --git a/Documentation/userspace-api/media/drivers/index.rst b/Documentation/userspace-api/media/drivers/index.rst
> index d706cb47b1122b6e145a02ab826eb3ecc7997c2b..02967c9b18d6e90f414ccc1329c09bffee895e68 100644
> --- a/Documentation/userspace-api/media/drivers/index.rst
> +++ b/Documentation/userspace-api/media/drivers/index.rst
> @@ -32,6 +32,7 @@ For more details see the file COPYING in the source distribution of Linux.
> cx2341x-uapi
> dw100
> imx-uapi
> + mali-c55
> max2175
> npcm-video
> omap3isp-uapi
> diff --git a/Documentation/userspace-api/media/drivers/mali-c55.rst b/Documentation/userspace-api/media/drivers/mali-c55.rst
> new file mode 100644
> index 0000000000000000000000000000000000000000..74f2cdb717e0dddeb11fb1eaba69eeebb2534f95
> --- /dev/null
> +++ b/Documentation/userspace-api/media/drivers/mali-c55.rst
> @@ -0,0 +1,55 @@
> +.. SPDX-License-Identifier: GPL-2.0-only
> +
> +Arm Mali-C55 ISP driver
> +=======================
> +
> +The Arm Mali-C55 ISP driver implements a single driver-specific control:
> +
> +``V4L2_CID_MALI_C55_CAPABILITIES (bitmask)``
> + Detail the capabilities of the ISP by giving detail about the fitted blocks.
> +
> + .. flat-table:: Bitmask meaning definitions
> + :header-rows: 1
> + :widths: 2 4 8
> +
> + * - Bit
> + - Macro
> + - Meaning
> + * - 0
> + - MALI_C55_GPS_PONG
> + - Pong configuration space is fitted in the ISP
> + * - 1
> + - MALI_C55_GPS_WDR
> + - WDR Framestitch, offset and gain is fitted in the ISP
> + * - 2
> + - MALI_C55_GPS_COMPRESSION
> + - Temper compression is fitted in the ISP
> + * - 3
> + - MALI_C55_GPS_TEMPER
> + - Temper is fitted in the ISP
> + * - 4
> + - MALI_C55_GPS_SINTER_LITE
> + - Sinter Lite is fitted in the ISP instead of the full Sinter version
> + * - 5
> + - MALI_C55_GPS_SINTER
> + - Sinter is fitted in the ISP
> + * - 6
> + - MALI_C55_GPS_IRIDIX_LTM
> + - Iridix local tone mappine is fitted in the ISP
> + * - 7
> + - MALI_C55_GPS_IRIDIX_GTM
> + - Iridix global tone mapping is fitted in the ISP
> + * - 8
> + - MALI_C55_GPS_CNR
> + - Colour noise reduction is fitted in the ISP
> + * - 9
> + - MALI_C55_GPS_FRSCALER
> + - The full resolution pipe scaler is fitted in the ISP
> + * - 10
> + - MALI_C55_GPS_DS_PIPE
> + - The downscale pipe is fitted in the ISP
> +
> + The Mali-C55 ISP can be configured in a number of ways to include or exclude
> + blocks which may not be necessary. This control provides a way for the
> + driver to communicate to userspace which of the blocks are fitted in the
> + design.
> \ No newline at end of file
> diff --git a/include/uapi/linux/media/arm/mali-c55-config.h b/include/uapi/linux/media/arm/mali-c55-config.h
> new file mode 100644
> index 0000000000000000000000000000000000000000..7fddece54ada9dadc3c76372d496d9395237a41c
> --- /dev/null
> +++ b/include/uapi/linux/media/arm/mali-c55-config.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * ARM Mali-C55 ISP Driver - Userspace API
> + *
> + * Copyright (C) 2023 Ideas on Board Oy
> + */
> +
> +#ifndef __UAPI_MALI_C55_CONFIG_H
> +#define __UAPI_MALI_C55_CONFIG_H
> +
> +#include <linux/v4l2-controls.h>
> +
> +#define V4L2_CID_MALI_C55_CAPABILITIES (V4L2_CID_USER_MALI_C55_BASE + 0x0)
> +#define MALI_C55_GPS_PONG (1U << 0)
> +#define MALI_C55_GPS_WDR (1U << 1)
> +#define MALI_C55_GPS_COMPRESSION (1U << 2)
> +#define MALI_C55_GPS_TEMPER (1U << 3)
> +#define MALI_C55_GPS_SINTER_LITE (1U << 4)
> +#define MALI_C55_GPS_SINTER (1U << 5)
> +#define MALI_C55_GPS_IRIDIX_LTM (1U << 6)
> +#define MALI_C55_GPS_IRIDIX_GTM (1U << 7)
> +#define MALI_C55_GPS_CNR (1U << 8)
> +#define MALI_C55_GPS_FRSCALER (1U << 9)
> +#define MALI_C55_GPS_DS_PIPE (1U << 10)
> +
> +#endif /* __UAPI_MALI_C55_CONFIG_H */
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index 2d30107e047ee3cf6b149e5b075cc9d4137b7d3f..f84ed133a6c9b2ddc1aedbd582ddf78cb71f34e5 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -228,6 +228,12 @@ enum v4l2_colorfx {
> */
> #define V4L2_CID_USER_RKISP1_BASE (V4L2_CID_USER_BASE + 0x1220)
>
> +/*
> + * The base for the Arm Mali-C55 ISP driver controls.
> + * We reserve 16 controls for this driver
> + */
> +#define V4L2_CID_USER_MALI_C55_BASE (V4L2_CID_USER_BASE + 0x1230)
> +
> /* MPEG-class control IDs */
> /* The MPEG controls are applicable to all codec controls
> * and the 'MPEG' part of the define is historical */
>
> --
> 2.43.0
>
>
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