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// SPDX-License-Identifier: GPL-2.0-only
/*
* Microchip Image Sensor Controller (ISC) Scaler entity support
*
* Copyright (C) 2022 Microchip Technology, Inc.
*
* Author: Eugen Hristev <eugen.hristev@microchip.com>
*
*/
#include <media/media-device.h>
#include <media/media-entity.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include "microchip-isc-regs.h"
#include "microchip-isc.h"
static void isc_scaler_prepare_fmt(struct v4l2_mbus_framefmt *framefmt)
{
framefmt->colorspace = V4L2_COLORSPACE_SRGB;
framefmt->field = V4L2_FIELD_NONE;
framefmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
framefmt->quantization = V4L2_QUANTIZATION_DEFAULT;
framefmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
};
static int isc_scaler_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *format)
{
struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
struct v4l2_mbus_framefmt *v4l2_try_fmt;
if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
v4l2_try_fmt = v4l2_subdev_state_get_format(sd_state,
format->pad);
format->format = *v4l2_try_fmt;
return 0;
}
format->format = isc->scaler_format[format->pad];
return 0;
}
static int isc_scaler_set_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_format *req_fmt)
{
struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
struct v4l2_mbus_framefmt *v4l2_try_fmt;
struct isc_format *fmt;
unsigned int i;
/* Source format is fixed, we cannot change it */
if (req_fmt->pad == ISC_SCALER_PAD_SOURCE) {
req_fmt->format = isc->scaler_format[ISC_SCALER_PAD_SOURCE];
return 0;
}
/* There is no limit on the frame size on the sink pad */
v4l_bound_align_image(&req_fmt->format.width, 16, UINT_MAX, 0,
&req_fmt->format.height, 16, UINT_MAX, 0, 0);
isc_scaler_prepare_fmt(&req_fmt->format);
fmt = isc_find_format_by_code(isc, req_fmt->format.code, &i);
if (!fmt)
fmt = &isc->formats_list[0];
req_fmt->format.code = fmt->mbus_code;
if (req_fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
v4l2_try_fmt = v4l2_subdev_state_get_format(sd_state,
req_fmt->pad);
*v4l2_try_fmt = req_fmt->format;
/* Trying on the sink pad makes the source pad change too */
v4l2_try_fmt = v4l2_subdev_state_get_format(sd_state,
ISC_SCALER_PAD_SOURCE);
*v4l2_try_fmt = req_fmt->format;
v4l_bound_align_image(&v4l2_try_fmt->width,
16, isc->max_width, 0,
&v4l2_try_fmt->height,
16, isc->max_height, 0, 0);
/* if we are just trying, we are done */
return 0;
}
isc->scaler_format[ISC_SCALER_PAD_SINK] = req_fmt->format;
/* The source pad is the same as the sink, but we have to crop it */
isc->scaler_format[ISC_SCALER_PAD_SOURCE] =
isc->scaler_format[ISC_SCALER_PAD_SINK];
v4l_bound_align_image
(&isc->scaler_format[ISC_SCALER_PAD_SOURCE].width, 16,
isc->max_width, 0,
&isc->scaler_format[ISC_SCALER_PAD_SOURCE].height, 16,
isc->max_height, 0, 0);
return 0;
}
static int isc_scaler_enum_mbus_code(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_mbus_code_enum *code)
{
struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
/*
* All formats supported by the ISC are supported by the scaler.
* Advertise the formats which the ISC can take as input, as the scaler
* entity cropping is part of the PFE module (parallel front end)
*/
if (code->index < isc->formats_list_size) {
code->code = isc->formats_list[code->index].mbus_code;
return 0;
}
return -EINVAL;
}
static int isc_scaler_g_sel(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state,
struct v4l2_subdev_selection *sel)
{
struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
if (sel->pad == ISC_SCALER_PAD_SOURCE)
return -EINVAL;
if (sel->target != V4L2_SEL_TGT_CROP_BOUNDS &&
sel->target != V4L2_SEL_TGT_CROP)
return -EINVAL;
sel->r.height = isc->scaler_format[ISC_SCALER_PAD_SOURCE].height;
sel->r.width = isc->scaler_format[ISC_SCALER_PAD_SOURCE].width;
sel->r.left = 0;
sel->r.top = 0;
return 0;
}
static int isc_scaler_init_state(struct v4l2_subdev *sd,
struct v4l2_subdev_state *sd_state)
{
struct v4l2_mbus_framefmt *v4l2_try_fmt =
v4l2_subdev_state_get_format(sd_state, 0);
struct v4l2_rect *try_crop;
struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
*v4l2_try_fmt = isc->scaler_format[ISC_SCALER_PAD_SOURCE];
try_crop = v4l2_subdev_state_get_crop(sd_state, 0);
try_crop->top = 0;
try_crop->left = 0;
try_crop->width = v4l2_try_fmt->width;
try_crop->height = v4l2_try_fmt->height;
return 0;
}
static const struct v4l2_subdev_pad_ops isc_scaler_pad_ops = {
.enum_mbus_code = isc_scaler_enum_mbus_code,
.set_fmt = isc_scaler_set_fmt,
.get_fmt = isc_scaler_get_fmt,
.get_selection = isc_scaler_g_sel,
};
static const struct media_entity_operations isc_scaler_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static const struct v4l2_subdev_ops xisc_scaler_subdev_ops = {
.pad = &isc_scaler_pad_ops,
};
static const struct v4l2_subdev_internal_ops isc_scaler_internal_ops = {
.init_state = isc_scaler_init_state,
};
int isc_scaler_init(struct isc_device *isc)
{
int ret;
v4l2_subdev_init(&isc->scaler_sd, &xisc_scaler_subdev_ops);
isc->scaler_sd.internal_ops = &isc_scaler_internal_ops;
isc->scaler_sd.owner = THIS_MODULE;
isc->scaler_sd.dev = isc->dev;
snprintf(isc->scaler_sd.name, sizeof(isc->scaler_sd.name),
"microchip_isc_scaler");
isc->scaler_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
isc->scaler_sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;
isc->scaler_sd.entity.ops = &isc_scaler_entity_ops;
isc->scaler_pads[ISC_SCALER_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
isc->scaler_pads[ISC_SCALER_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
isc_scaler_prepare_fmt(&isc->scaler_format[ISC_SCALER_PAD_SOURCE]);
isc->scaler_format[ISC_SCALER_PAD_SOURCE].height = isc->max_height;
isc->scaler_format[ISC_SCALER_PAD_SOURCE].width = isc->max_width;
isc->scaler_format[ISC_SCALER_PAD_SOURCE].code =
isc->formats_list[0].mbus_code;
isc->scaler_format[ISC_SCALER_PAD_SINK] =
isc->scaler_format[ISC_SCALER_PAD_SOURCE];
ret = media_entity_pads_init(&isc->scaler_sd.entity,
ISC_SCALER_PADS_NUM,
isc->scaler_pads);
if (ret < 0) {
dev_err(isc->dev, "scaler sd media entity init failed\n");
return ret;
}
ret = v4l2_device_register_subdev(&isc->v4l2_dev, &isc->scaler_sd);
if (ret < 0) {
dev_err(isc->dev, "scaler sd failed to register subdev\n");
return ret;
}
return ret;
}
EXPORT_SYMBOL_GPL(isc_scaler_init);
int isc_scaler_link(struct isc_device *isc)
{
int ret;
ret = media_create_pad_link(&isc->current_subdev->sd->entity,
isc->remote_pad, &isc->scaler_sd.entity,
ISC_SCALER_PAD_SINK,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret < 0) {
dev_err(isc->dev, "Failed to create pad link: %s to %s\n",
isc->current_subdev->sd->entity.name,
isc->scaler_sd.entity.name);
return ret;
}
dev_dbg(isc->dev, "link with %s pad: %d\n",
isc->current_subdev->sd->name, isc->remote_pad);
ret = media_create_pad_link(&isc->scaler_sd.entity,
ISC_SCALER_PAD_SOURCE,
&isc->video_dev.entity, ISC_PAD_SINK,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret < 0) {
dev_err(isc->dev, "Failed to create pad link: %s to %s\n",
isc->scaler_sd.entity.name,
isc->video_dev.entity.name);
return ret;
}
dev_dbg(isc->dev, "link with %s pad: %d\n", isc->scaler_sd.name,
ISC_SCALER_PAD_SOURCE);
return ret;
}
EXPORT_SYMBOL_GPL(isc_scaler_link);
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