media: uapi: Add a control for DW100 driver
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>
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@ -66,4 +66,19 @@ map.
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More details on the DW100 hardware operations can be found in
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*chapter 13.15 DeWarp* of IMX8MP_ reference manual.
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The Vivante DW100 m2m driver implements the following driver-specific control:
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``V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP (__u32 array)``
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Specifies to DW100 driver its dewarping map (aka LUT) blob as described in
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*chapter 13.15.2.3 Dewarping Remap* of IMX8MP_ reference manual as an U32
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dynamic array. The image is divided into many small 16x16 blocks. If the
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width/height of the image is not divisible by 16, the size of the
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rightmost/bottommost block is the remainder. The dewarping map only saves
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the vertex coordinates of the block. The dewarping grid map is comprised of
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vertex coordinates for x and y. Each x, y coordinate register uses 16 bits
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(UQ12.4) to record the coordinate address, with the Y coordinate in the
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upper bits and X in the lower bits. The driver modifies the dimensions of
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this control when the sink format is changed, to reflect the new input
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resolution.
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.. _IMX8MP: https://www.nxp.com/webapp/Download?colCode=IMX8MPRM
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@ -0,0 +1,14 @@
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/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
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/* Copyright 2022 NXP */
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#ifndef __UAPI_DW100_H__
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#define __UAPI_DW100_H__
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#include <linux/v4l2-controls.h>
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/*
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* Check Documentation/userspace-api/media/drivers/dw100.rst for control details.
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*/
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#define V4L2_CID_DW100_DEWARPING_16x16_VERTEX_MAP (V4L2_CID_USER_DW100_BASE + 1)
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#endif
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