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media: uapi: Add a control for DW100 driver

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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@oss.nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Xavier Roumegue 2022-07-30 17:48:40 +02:00 committed by Mauro Carvalho Chehab
parent a41c4088cf
commit 9d5c3c0698
2 changed files with 29 additions and 0 deletions
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15
Documentation/userspace-api/media/drivers/dw100.rst
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@ -66,4 +66,19 @@ map.
More details on the DW100 hardware operations can be found in
*chapter 13.15 DeWarp* of IMX8MP_ reference manual.
The Vivante DW100 m2m driver implements the following driver-specific control:
``V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP (__u32 array)``
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/height of the image is not divisible by 16, the size of the
rightmost/bottommost 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. The driver modifies the dimensions of
this control when the sink format is changed, to reflect the new input
resolution.
.. _IMX8MP: https://www.nxp.com/webapp/Download?colCode=IMX8MPRM

14
include/uapi/linux/dw100.h Normal file
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@ -0,0 +1,14 @@
/* 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>
/*
* Check Documentation/userspace-api/media/drivers/dw100.rst for control details.
*/
#define V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP (V4L2_CID_USER_DW100_BASE + 1)
#endif