The DW100 driver gets the dewarping mapping as a binary blob from the userspace application through a custom control. The blob format is hardware specific so create a dedicated control for this purpose. Signed-off-by: Xavier Roumegue <xavier.roumegue@xxxxxxxxxxx> --- Documentation/userspace-api/media/drivers/dw100.rst | 12 ++++++++++++ include/uapi/linux/dw100.h | 11 +++++++++++ 2 files changed, 23 insertions(+) create mode 100644 include/uapi/linux/dw100.h diff --git a/Documentation/userspace-api/media/drivers/dw100.rst b/Documentation/userspace-api/media/drivers/dw100.rst index 4cd55c75628e..f6d684cadf26 100644 --- a/Documentation/userspace-api/media/drivers/dw100.rst +++ b/Documentation/userspace-api/media/drivers/dw100.rst @@ -20,4 +20,16 @@ match the expected size inherited from the destination image resolution. More details on the DW100 hardware operations can be found in *chapter 13.15 DeWarp* of IMX8MP_ reference manuel. +The Vivante DW100 m2m driver implements the following driver-specific control: + +``V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP (integer)`` + Specifies to DW100 driver its dewarping map (aka LUT) blob as described in + *chapter 13.15.2.3 Dewarping Remap* of IMX8MP_ reference manual as an U32 + dynamic array. The image is divided into many small 16x16 blocks. If the + width of the image is not divisible by 16, the size of the rightmost block + is the remainder. The dewarping map only saves the vertex coordinates of the + block. The dewarping grid map is comprised of vertex coordinates for x and y. + Each x, y coordinate register uses 16 bits (UQ12.4) to record the coordinate + address, with the Y coordinate in the upper bits and X in the lower bits. + .. _IMX8MP: https://www.nxp.com/webapp/Download?colCode=IMX8MPRM diff --git a/include/uapi/linux/dw100.h b/include/uapi/linux/dw100.h new file mode 100644 index 000000000000..7fdcf2bf42e5 --- /dev/null +++ b/include/uapi/linux/dw100.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */ +/* Copyright 2022 NXP */ + +#ifndef __UAPI_DW100_H__ +#define __UAPI_DW100_H__ + +#include <linux/v4l2-controls.h> + +#define V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP (V4L2_CID_USER_DW100_BASE + 1) + +#endif -- 2.35.1
