![Laurent Pinchart](/assets/img/avatar_default.png)
The DISCOM calculates a CRC on a configurable window of the frame. It interfaces to the VSP through the UIF glue, hence the name used in the code. The module supports configuration of the CRC window through the crop rectangle on the sink pad of the corresponding entity. However, unlike the traditional V4L2 subdevice model, the crop rectangle does not influence the format on the source pad. Modeling the DISCOM as a sink-only entity would allow adhering to the V4L2 subdevice model at the expense of more complex code in the driver, as at the hardware level the UIF is handled as a sink+source entity. As the DISCOM is only present in R-Car Gen3 VSP-D and VSP-DL instances it is not exposed to userspace through V4L2 but controlled through the DU driver. We can thus change this model later if needed without fear of affecting userspace. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
33 lines
715 B
C
33 lines
715 B
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* vsp1_uif.h -- R-Car VSP1 User Logic Interface
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*
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* Copyright (C) 2017-2018 Laurent Pinchart
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*
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* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#ifndef __VSP1_UIF_H__
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#define __VSP1_UIF_H__
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#include "vsp1_entity.h"
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struct vsp1_device;
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#define UIF_PAD_SINK 0
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#define UIF_PAD_SOURCE 1
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struct vsp1_uif {
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struct vsp1_entity entity;
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bool m3w_quirk;
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};
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static inline struct vsp1_uif *to_uif(struct v4l2_subdev *subdev)
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{
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return container_of(subdev, struct vsp1_uif, entity.subdev);
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}
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struct vsp1_uif *vsp1_uif_create(struct vsp1_device *vsp1, unsigned int index);
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u32 vsp1_uif_get_crc(struct vsp1_uif *uif);
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#endif /* __VSP1_UIF_H__ */
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