// SPDX-License-Identifier: GPL-2.0
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/*
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* Support for Medifield PNW Camera Imaging ISP subsystem.
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*
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* Copyright (c) 2010 Intel Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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*/
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#include <media/v4l2-event.h>
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#include <media/v4l2-mediabus.h>
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#include "atomisp_cmd.h"
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#include "atomisp_internal.h"
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#include "atomisp-regs.h"
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static struct v4l2_mbus_framefmt *__csi2_get_format(struct
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atomisp_mipi_csi2_device
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* csi2,
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struct
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v4l2_subdev_pad_config *cfg,
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enum
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v4l2_subdev_format_whence
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which, unsigned int pad) {
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if (which == V4L2_SUBDEV_FORMAT_TRY)
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return v4l2_subdev_get_try_format(&csi2->subdev, cfg, pad);
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else
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return &csi2->formats[pad];
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}
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/*
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* csi2_enum_mbus_code - Handle pixel format enumeration
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* @sd : pointer to v4l2 subdev structure
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* @fh : V4L2 subdev file handle
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* @code : pointer to v4l2_subdev_pad_mbus_code_enum structure
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* return -EINVAL or zero on success
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*/
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static int csi2_enum_mbus_code(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_mbus_code_enum *code)
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{
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const struct atomisp_in_fmt_conv *ic = atomisp_in_fmt_conv;
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unsigned int i = 0;
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while (ic->code) {
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if (i == code->index) {
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code->code = ic->code;
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return 0;
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}
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i++, ic++;
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}
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return -EINVAL;
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}
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/*
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* csi2_get_format - Handle get format by pads subdev method
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* @sd : pointer to v4l2 subdev structure
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* @fh : V4L2 subdev file handle
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* @pad: pad num
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* @fmt: pointer to v4l2 format structure
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* return -EINVAL or zero on success
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*/
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static int csi2_get_format(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *fmt)
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{
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struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
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struct v4l2_mbus_framefmt *format;
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format = __csi2_get_format(csi2, cfg, fmt->which, fmt->pad);
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fmt->format = *format;
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return 0;
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}
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int atomisp_csi2_set_ffmt(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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unsigned int which, uint16_t pad,
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struct v4l2_mbus_framefmt *ffmt)
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{
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struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
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struct v4l2_mbus_framefmt *actual_ffmt = __csi2_get_format(csi2, cfg, which, pad);
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if (pad == CSI2_PAD_SINK) {
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const struct atomisp_in_fmt_conv *ic;
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struct v4l2_mbus_framefmt tmp_ffmt;
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ic = atomisp_find_in_fmt_conv(ffmt->code);
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if (ic)
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actual_ffmt->code = ic->code;
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else
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actual_ffmt->code = atomisp_in_fmt_conv[0].code;
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actual_ffmt->width = clamp_t(
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u32, ffmt->width, ATOM_ISP_MIN_WIDTH,
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ATOM_ISP_MAX_WIDTH);
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actual_ffmt->height = clamp_t(
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u32, ffmt->height, ATOM_ISP_MIN_HEIGHT,
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ATOM_ISP_MAX_HEIGHT);
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tmp_ffmt = *ffmt = *actual_ffmt;
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return atomisp_csi2_set_ffmt(sd, cfg, which, CSI2_PAD_SOURCE,
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&tmp_ffmt);
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}
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/* FIXME: DPCM decompression */
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*actual_ffmt = *ffmt = *__csi2_get_format(csi2, cfg, which, CSI2_PAD_SINK);
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return 0;
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}
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/*
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* csi2_set_format - Handle set format by pads subdev method
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* @sd : pointer to v4l2 subdev structure
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* @fh : V4L2 subdev file handle
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* @pad: pad num
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* @fmt: pointer to v4l2 format structure
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* return -EINVAL or zero on success
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*/
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static int csi2_set_format(struct v4l2_subdev *sd,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *fmt)
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{
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return atomisp_csi2_set_ffmt(sd, cfg, fmt->which, fmt->pad,
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&fmt->format);
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}
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/*
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* csi2_set_stream - Enable/Disable streaming on the CSI2 module
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* @sd: ISP CSI2 V4L2 subdevice
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* @enable: Enable/disable stream (1/0)
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*
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* Return 0 on success or a negative error code otherwise.
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*/
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static int csi2_set_stream(struct v4l2_subdev *sd, int enable)
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{
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return 0;
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}
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/* subdev core operations */
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static const struct v4l2_subdev_core_ops csi2_core_ops = {
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};
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/* subdev video operations */
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static const struct v4l2_subdev_video_ops csi2_video_ops = {
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.s_stream = csi2_set_stream,
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};
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/* subdev pad operations */
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static const struct v4l2_subdev_pad_ops csi2_pad_ops = {
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.enum_mbus_code = csi2_enum_mbus_code,
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.get_fmt = csi2_get_format,
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.set_fmt = csi2_set_format,
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.link_validate = v4l2_subdev_link_validate_default,
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};
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/* subdev operations */
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static const struct v4l2_subdev_ops csi2_ops = {
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.core = &csi2_core_ops,
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.video = &csi2_video_ops,
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.pad = &csi2_pad_ops,
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};
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/*
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* csi2_link_setup - Setup CSI2 connections.
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* @entity : Pointer to media entity structure
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* @local : Pointer to local pad array
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* @remote : Pointer to remote pad array
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* @flags : Link flags
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* return -EINVAL or zero on success
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*/
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static int csi2_link_setup(struct media_entity *entity,
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const struct media_pad *local,
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const struct media_pad *remote, u32 flags)
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{
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struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
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struct atomisp_mipi_csi2_device *csi2 = v4l2_get_subdevdata(sd);
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u32 result = local->index | is_media_entity_v4l2_subdev(remote->entity);
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switch (result) {
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case CSI2_PAD_SOURCE | MEDIA_ENT_F_OLD_BASE:
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/* not supported yet */
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return -EINVAL;
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case CSI2_PAD_SOURCE | MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN:
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if (flags & MEDIA_LNK_FL_ENABLED) {
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if (csi2->output & ~CSI2_OUTPUT_ISP_SUBDEV)
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return -EBUSY;
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csi2->output |= CSI2_OUTPUT_ISP_SUBDEV;
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} else {
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csi2->output &= ~CSI2_OUTPUT_ISP_SUBDEV;
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}
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break;
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default:
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/* Link from camera to CSI2 is fixed... */
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return -EINVAL;
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}
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return 0;
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}
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/* media operations */
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static const struct media_entity_operations csi2_media_ops = {
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.link_setup = csi2_link_setup,
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.link_validate = v4l2_subdev_link_validate,
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};
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/*
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* ispcsi2_init_entities - Initialize subdev and media entity.
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* @csi2: Pointer to ispcsi2 structure.
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* return -ENOMEM or zero on success
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*/
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static int mipi_csi2_init_entities(struct atomisp_mipi_csi2_device *csi2,
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int port)
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{
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struct v4l2_subdev *sd = &csi2->subdev;
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struct media_pad *pads = csi2->pads;
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struct media_entity *me = &sd->entity;
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int ret;
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v4l2_subdev_init(sd, &csi2_ops);
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snprintf(sd->name, sizeof(sd->name), "ATOM ISP CSI2-port%d", port);
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v4l2_set_subdevdata(sd, csi2);
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sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
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pads[CSI2_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
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pads[CSI2_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
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me->ops = &csi2_media_ops;
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me->function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
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ret = media_entity_pads_init(me, CSI2_PADS_NUM, pads);
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if (ret < 0)
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return ret;
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csi2->formats[CSI2_PAD_SINK].code =
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csi2->formats[CSI2_PAD_SOURCE].code =
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atomisp_in_fmt_conv[0].code;
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return 0;
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}
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void
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atomisp_mipi_csi2_unregister_entities(struct atomisp_mipi_csi2_device *csi2)
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{
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media_entity_cleanup(&csi2->subdev.entity);
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v4l2_device_unregister_subdev(&csi2->subdev);
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}
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int atomisp_mipi_csi2_register_entities(struct atomisp_mipi_csi2_device *csi2,
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struct v4l2_device *vdev)
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{
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int ret;
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/* Register the subdev and video nodes. */
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ret = v4l2_device_register_subdev(vdev, &csi2->subdev);
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if (ret < 0)
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goto error;
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return 0;
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error:
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atomisp_mipi_csi2_unregister_entities(csi2);
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return ret;
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}
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static const int LIMIT_SHIFT = 6; /* Limit numeric range into 31 bits */
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static int
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atomisp_csi2_configure_calc(const short int coeffs[2], int mipi_freq, int def)
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{
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/* Delay counter accuracy, 1/0.0625 for ANN/CHT, 1/0.125 for BXT */
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static const int accinv = 16; /* 1 / COUNT_ACC */
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int r;
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if (mipi_freq >> LIMIT_SHIFT <= 0)
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return def;
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r = accinv * coeffs[1] * (500000000 >> LIMIT_SHIFT);
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r /= mipi_freq >> LIMIT_SHIFT;
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r += accinv * coeffs[0];
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return r;
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}
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static void atomisp_csi2_configure_isp2401(struct atomisp_sub_device *asd)
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{
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/*
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* The ISP2401 new input system CSI2+ receiver has several
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* parameters affecting the receiver timings. These depend
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* on the MIPI bus frequency F in Hz (sensor transmitter rate)
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* as follows:
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* register value = (A/1e9 + B * UI) / COUNT_ACC
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* where
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* UI = 1 / (2 * F) in seconds
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* COUNT_ACC = counter accuracy in seconds
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* For ANN and CHV, COUNT_ACC = 0.0625 ns
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* For BXT, COUNT_ACC = 0.125 ns
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* A and B are coefficients from the table below,
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* depending whether the register minimum or maximum value is
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* calculated.
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* Minimum Maximum
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* Clock lane A B A B
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* reg_rx_csi_dly_cnt_termen_clane 0 0 38 0
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* reg_rx_csi_dly_cnt_settle_clane 95 -8 300 -16
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* Data lanes
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* reg_rx_csi_dly_cnt_termen_dlane0 0 0 35 4
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* reg_rx_csi_dly_cnt_settle_dlane0 85 -2 145 -6
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* reg_rx_csi_dly_cnt_termen_dlane1 0 0 35 4
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* reg_rx_csi_dly_cnt_settle_dlane1 85 -2 145 -6
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* reg_rx_csi_dly_cnt_termen_dlane2 0 0 35 4
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* reg_rx_csi_dly_cnt_settle_dlane2 85 -2 145 -6
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* reg_rx_csi_dly_cnt_termen_dlane3 0 0 35 4
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* reg_rx_csi_dly_cnt_settle_dlane3 85 -2 145 -6
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*
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* We use the minimum values in the calculations below.
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*/
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static const short int coeff_clk_termen[] = { 0, 0 };
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static const short int coeff_clk_settle[] = { 95, -8 };
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static const short int coeff_dat_termen[] = { 0, 0 };
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static const short int coeff_dat_settle[] = { 85, -2 };
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static const int TERMEN_DEFAULT = 0 * 0;
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static const int SETTLE_DEFAULT = 0x480;
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static const hrt_address csi2_port_base[] = {
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[ATOMISP_CAMERA_PORT_PRIMARY] = CSI2_PORT_A_BASE,
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[ATOMISP_CAMERA_PORT_SECONDARY] = CSI2_PORT_B_BASE,
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[ATOMISP_CAMERA_PORT_TERTIARY] = CSI2_PORT_C_BASE,
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};
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/* Number of lanes on each port, excluding clock lane */
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static const unsigned char csi2_port_lanes[] = {
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[ATOMISP_CAMERA_PORT_PRIMARY] = 4,
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[ATOMISP_CAMERA_PORT_SECONDARY] = 2,
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[ATOMISP_CAMERA_PORT_TERTIARY] = 2,
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};
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static const hrt_address csi2_lane_base[] = {
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CSI2_LANE_CL_BASE,
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CSI2_LANE_D0_BASE,
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CSI2_LANE_D1_BASE,
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CSI2_LANE_D2_BASE,
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CSI2_LANE_D3_BASE,
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};
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int clk_termen;
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int clk_settle;
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int dat_termen;
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int dat_settle;
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struct v4l2_control ctrl;
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struct atomisp_device *isp = asd->isp;
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struct camera_mipi_info *mipi_info;
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int mipi_freq = 0;
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enum atomisp_camera_port port;
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int n;
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mipi_info = atomisp_to_sensor_mipi_info(
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isp->inputs[asd->input_curr].camera);
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port = mipi_info->port;
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ctrl.id = V4L2_CID_LINK_FREQ;
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if (v4l2_g_ctrl
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(isp->inputs[asd->input_curr].camera->ctrl_handler, &ctrl) == 0)
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mipi_freq = ctrl.value;
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clk_termen = atomisp_csi2_configure_calc(coeff_clk_termen,
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mipi_freq, TERMEN_DEFAULT);
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clk_settle = atomisp_csi2_configure_calc(coeff_clk_settle,
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mipi_freq, SETTLE_DEFAULT);
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dat_termen = atomisp_csi2_configure_calc(coeff_dat_termen,
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mipi_freq, TERMEN_DEFAULT);
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dat_settle = atomisp_csi2_configure_calc(coeff_dat_settle,
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mipi_freq, SETTLE_DEFAULT);
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for (n = 0; n < csi2_port_lanes[port] + 1; n++) {
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hrt_address base = csi2_port_base[port] + csi2_lane_base[n];
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atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_TERMEN,
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n == 0 ? clk_termen : dat_termen);
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atomisp_css2_hw_store_32(base + CSI2_REG_RX_CSI_DLY_CNT_SETTLE,
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n == 0 ? clk_settle : dat_settle);
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}
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}
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void atomisp_csi2_configure(struct atomisp_sub_device *asd)
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{
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if (IS_HWREVISION(asd->isp, ATOMISP_HW_REVISION_ISP2401))
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atomisp_csi2_configure_isp2401(asd);
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}
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/*
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* atomisp_mipi_csi2_cleanup - Routine for module driver cleanup
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*/
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void atomisp_mipi_csi2_cleanup(struct atomisp_device *isp)
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{
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}
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int atomisp_mipi_csi2_init(struct atomisp_device *isp)
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{
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struct atomisp_mipi_csi2_device *csi2_port;
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unsigned int i;
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int ret;
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for (i = 0; i < ATOMISP_CAMERA_NR_PORTS; i++) {
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csi2_port = &isp->csi2_port[i];
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csi2_port->isp = isp;
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ret = mipi_csi2_init_entities(csi2_port, i);
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if (ret < 0)
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goto fail;
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}
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return 0;
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fail:
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atomisp_mipi_csi2_cleanup(isp);
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return ret;
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}
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