Message-ID: <20220207124444.giyamcg2dgn6t3hv@uno.localdomain>
Date:   Mon, 7 Feb 2022 13:44:44 +0100
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Eugen Hristev <eugen.hristev@...rochip.com>
Cc:     robh+dt@...nel.org, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, jacopo+renesas@...ndi.org,
        hverkuil-cisco@...all.nl, nicolas.ferre@...rochip.com,
        sakari.ailus@....fi, laurent.pinchart@...asonboard.com
Subject: Re: [PATCH v4 03/11] media: atmel: atmel-isc: implement media
 controller

Hi Eugen

On Fri, Jan 21, 2022 at 03:14:08PM +0200, Eugen Hristev wrote:
> Implement the support for media-controller.
> This means that the capabilities of the driver have changed and now
> it also advertises the IO_MC .
> The driver will register it's media device, and add the video entity to this
> media device. The subdevices are registered to the same media device.
> The ISC will have a base entity which is auto-detected as atmel_isc_base.
> It will also register a subdevice that allows cropping of the incoming frame
> to the maximum frame size supported by the ISC.
> The ISC will create a link between the subdevice that is asynchronously
> registered and the atmel_isc_scaler entity.
> Then, the atmel_isc_scaler and atmel_isc_base are connected through another
> link.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> ---
> Changes in v4:
> As suggested by Jacopo:
> - renamed atmel_isc_mc to atmel_isc_scaler.c
> - moved init_mc/clean_mc to isc_base file
>
> Changes in v2:
> - implement try formats
>
>  drivers/media/platform/atmel/Makefile         |   2 +-
>  drivers/media/platform/atmel/atmel-isc-base.c |  73 +++++-
>  .../media/platform/atmel/atmel-isc-scaler.c   | 245 ++++++++++++++++++
>  drivers/media/platform/atmel/atmel-isc.h      |  37 +++
>  .../media/platform/atmel/atmel-sama5d2-isc.c  |  14 +-
>  .../media/platform/atmel/atmel-sama7g5-isc.c  |  12 +-
>  6 files changed, 375 insertions(+), 8 deletions(-)
>  create mode 100644 drivers/media/platform/atmel/atmel-isc-scaler.c
>
> diff --git a/drivers/media/platform/atmel/Makefile b/drivers/media/platform/atmel/Makefile
> index 794e8f739287..f02d03df89d6 100644
> --- a/drivers/media/platform/atmel/Makefile
> +++ b/drivers/media/platform/atmel/Makefile
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  atmel-isc-objs = atmel-sama5d2-isc.o
>  atmel-xisc-objs = atmel-sama7g5-isc.o
> -atmel-isc-common-objs = atmel-isc-base.o atmel-isc-clk.o
> +atmel-isc-common-objs = atmel-isc-base.o atmel-isc-clk.o atmel-isc-scaler.o
>
>  obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel-isi.o
>  obj-$(CONFIG_VIDEO_ATMEL_ISC_BASE) += atmel-isc-common.o
> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
> index 6b0005987a17..6b482270eb93 100644
> --- a/drivers/media/platform/atmel/atmel-isc-base.c
> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
> @@ -1710,6 +1710,7 @@ static int isc_async_bound(struct v4l2_async_notifier *notifier,
>  					      struct isc_device, v4l2_dev);
>  	struct isc_subdev_entity *subdev_entity =
>  		container_of(notifier, struct isc_subdev_entity, notifier);
> +	int pad;
>
>  	if (video_is_registered(&isc->video_dev)) {
>  		v4l2_err(&isc->v4l2_dev, "only supports one sub-device.\n");
> @@ -1718,6 +1719,16 @@ static int isc_async_bound(struct v4l2_async_notifier *notifier,
>
>  	subdev_entity->sd = subdev;
>
> +	pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
> +					  MEDIA_PAD_FL_SOURCE);
> +	if (pad < 0) {
> +		v4l2_err(&isc->v4l2_dev, "failed to find pad for %s\n",
> +			 subdev->name);
> +		return pad;
> +	}
> +
> +	isc->remote_pad = pad;
> +
>  	return 0;
>  }
>
> @@ -1732,8 +1743,8 @@ static void isc_async_unbind(struct v4l2_async_notifier *notifier,
>  	v4l2_ctrl_handler_free(&isc->ctrls.handler);
>  }
>
> -static struct isc_format *find_format_by_code(struct isc_device *isc,
> -					      unsigned int code, int *index)
> +struct isc_format *isc_find_format_by_code(struct isc_device *isc,
> +					   unsigned int code, int *index)
>  {
>  	struct isc_format *fmt = &isc->formats_list[0];
>  	unsigned int i;
> @@ -1749,6 +1760,7 @@ static struct isc_format *find_format_by_code(struct isc_device *isc,
>
>  	return NULL;
>  }
> +EXPORT_SYMBOL_GPL(isc_find_format_by_code);
>
>  static int isc_formats_init(struct isc_device *isc)
>  {
> @@ -1765,7 +1777,7 @@ static int isc_formats_init(struct isc_device *isc)
>  	       NULL, &mbus_code)) {
>  		mbus_code.index++;
>
> -		fmt = find_format_by_code(isc, mbus_code.code, &i);
> +		fmt = isc_find_format_by_code(isc, mbus_code.code, &i);
>  		if (!fmt) {
>  			v4l2_warn(&isc->v4l2_dev, "Mbus code %x not supported\n",
>  				  mbus_code.code);
> @@ -1891,7 +1903,8 @@ static int isc_async_complete(struct v4l2_async_notifier *notifier)
>  	vdev->queue		= q;
>  	vdev->lock		= &isc->lock;
>  	vdev->ctrl_handler	= &isc->ctrls.handler;
> -	vdev->device_caps	= V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE;
> +	vdev->device_caps	= V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE |
> +				  V4L2_CAP_IO_MC;
>  	video_set_drvdata(vdev, isc);
>
>  	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
> @@ -1901,8 +1914,18 @@ static int isc_async_complete(struct v4l2_async_notifier *notifier)
>  		goto isc_async_complete_err;
>  	}
>
> +	ret = isc_scaler_link(isc);
> +	if (ret < 0)
> +		goto isc_async_complete_unregister_device;
> +
> +	ret = media_device_register(&isc->mdev);
> +	if (ret < 0)
> +		goto isc_async_complete_unregister_device;
>  	return 0;
>
> +isc_async_complete_unregister_device:
> +	video_unregister_device(vdev);
> +
>  isc_async_complete_err:
>  	mutex_destroy(&isc->lock);
>  	return ret;
> @@ -1969,6 +1992,48 @@ int isc_pipeline_init(struct isc_device *isc)
>  }
>  EXPORT_SYMBOL_GPL(isc_pipeline_init);
>
> +int isc_mc_init(struct isc_device *isc, u32 ver)
> +{
> +	const struct of_device_id *match;
> +	int ret;
> +
> +	isc->video_dev.entity.function = MEDIA_ENT_F_IO_V4L;
> +	isc->video_dev.entity.flags = MEDIA_ENT_FL_DEFAULT;

Should you set entity.ops.link_validate = v4l2_subdev_link_validate
to be able to have the media pipeline validated at
media_pipeline_start() time ?

> +	isc->pads[ISC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
> +
> +	ret = media_entity_pads_init(&isc->video_dev.entity, ISC_PADS_NUM,
> +				     isc->pads);
> +	if (ret < 0) {
> +		dev_err(isc->dev, "media entity init failed\n");
> +		return ret;
> +	}
> +
> +	isc->mdev.dev = isc->dev;
> +
> +	match = of_match_node(isc->dev->driver->of_match_table,
> +			      isc->dev->of_node);
> +
> +	strscpy(isc->mdev.driver_name, KBUILD_MODNAME,
> +		sizeof(isc->mdev.driver_name));
> +	strscpy(isc->mdev.model, match->compatible, sizeof(isc->mdev.model));
> +	snprintf(isc->mdev.bus_info, sizeof(isc->mdev.bus_info), "platform:%s",
> +		 isc->v4l2_dev.name);
> +	isc->mdev.hw_revision = ver;
> +
> +	media_device_init(&isc->mdev);
> +
> +	isc->v4l2_dev.mdev = &isc->mdev;
> +
> +	return isc_scaler_init(isc);
> +}
> +EXPORT_SYMBOL_GPL(isc_mc_init);
> +
> +void isc_mc_cleanup(struct isc_device *isc)
> +{
> +	media_entity_cleanup(&isc->video_dev.entity);
> +}
> +EXPORT_SYMBOL_GPL(isc_mc_cleanup);
> +
>  /* regmap configuration */
>  #define ATMEL_ISC_REG_MAX    0xd5c
>  const struct regmap_config isc_regmap_config = {
> diff --git a/drivers/media/platform/atmel/atmel-isc-scaler.c b/drivers/media/platform/atmel/atmel-isc-scaler.c
> new file mode 100644
> index 000000000000..ec95c9665883
> --- /dev/null
> +++ b/drivers/media/platform/atmel/atmel-isc-scaler.c
> @@ -0,0 +1,245 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Microchip Image Sensor Controller (ISC) Scaler entity support
> + *
> + * Copyright (C) 2021 Microchip Technology, Inc.

Time flies! It's 2022 already :)

> + *
> + * Author: Eugen Hristev <eugen.hristev@...rochip.com>
> + *
> + */
> +
> +#include <media/media-device.h>
> +#include <media/media-entity.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-subdev.h>
> +
> +#include "atmel-isc-regs.h"
> +#include "atmel-isc.h"
> +
> +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_get_try_format(sd, sd_state,
> +							  format->pad);
> +		format->format = *v4l2_try_fmt;
> +
> +		return 0;
> +	}
> +
> +	format->format = isc->scaler_format;

isc->scaler_format is only used inside this file if I'm not mistaken.
I wonder why it lives in the isc_device struct.

> +
> +	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;
> +
> +	if (req_fmt->pad == ISC_SCALER_PAD_SOURCE)
> +		v4l_bound_align_image
> +			(&req_fmt->format.width, 16, isc->max_width, 0,
> +			 &req_fmt->format.height, 16, isc->max_height, 0, 0);
> +	else
> +		v4l_bound_align_image
> +			(&req_fmt->format.width, 16, 10000, 0,
> +			 &req_fmt->format.height, 16, 10000, 0, 0);

Where does 10000 come from ?

> +
> +	req_fmt->format.colorspace = V4L2_COLORSPACE_SRGB;
> +	req_fmt->format.field = V4L2_FIELD_NONE;
> +	req_fmt->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> +	req_fmt->format.quantization = V4L2_QUANTIZATION_DEFAULT;
> +	req_fmt->format.xfer_func = V4L2_XFER_FUNC_DEFAULT;
> +
> +	fmt = isc_find_format_by_code(isc, req_fmt->format.code, &i);

So you rely on the isc format list for the scaler as well ?
I think it's fine as long as they are identical

> +
> +	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_get_try_format(sd, sd_state,
> +							  req_fmt->pad);
> +		*v4l2_try_fmt = req_fmt->format;
> +		/* Trying on the pad sink makes the source sink change too */
> +		if (req_fmt->pad == ISC_SCALER_PAD_SINK) {
> +			v4l2_try_fmt =
> +				v4l2_subdev_get_try_format(sd, 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 = req_fmt->format;

No per-pad format but a global scaler_format ? How do you configure scaling ?

Actually, I would like to know more about the scaler device
capabilities. What functions can this IP perform ? Does it do
cropping, can it also do (down)scaling or even composition ?

I think it is worth to read
https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-subdev.html#v4l2-subdev-selections
where it is reported how cropping and scaling are implemented by using
the selection API.

Figure 4.5 is particularly helpful to explain the simple crop case,
for which you need to implement support to by adding s_selection on
the sink pad TGT_CROP target.

> +
> +	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);
> +	int supported_index = 0;
> +	int i;
> +
> +	for (i = 0; i < isc->formats_list_size; i++) {
> +		if (!isc->formats_list[i].sd_support)
> +			continue;

The sd_support flag still doesn't click in my head.

Shouldn't the enumeration of available formats on the scaler do not
depend on the sensor supproted formats ?

> +		if (supported_index == code->index) {
> +			code->code = isc->formats_list[i].mbus_code;
> +			return 0;
> +		}
> +		supported_index++;
> +	}
> +
> +	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->max_height;
> +	sel->r.width = isc->max_width;

The CROP_BOUNDS should be set to the same size as the sink pad image format,
as it represents the maximum valid crop rectangle.

TGT_CROP should report the configured crop rectangle which can be
intiialized to the same size as CROP_BOUNDS, if my understanding of
the spec is correct

> +
> +	sel->r.left = 0;
> +	sel->r.top = 0;
> +
> +	return 0;
> +}
> +
> +static int isc_scaler_init_cfg(struct v4l2_subdev *sd,
> +			       struct v4l2_subdev_state *sd_state)
> +{
> +	struct v4l2_mbus_framefmt *v4l2_try_fmt =
> +		v4l2_subdev_get_try_format(sd, sd_state, 0);
> +	struct isc_device *isc = container_of(sd, struct isc_device, scaler_sd);
> +
> +	*v4l2_try_fmt = isc->scaler_format;
> +
> +	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,
> +	.init_cfg = isc_scaler_init_cfg,

.link_validate = v4l2_subdev_link_validate_default,

To have the formats at the end of links that point to this entity
validated (I think the framework already calls it if not set though,
please check v4l2-subdev.c:v4l2_subdev_link_validate())

> +};
> +
> +static const struct v4l2_subdev_ops xisc_scaler_subdev_ops = {
> +	.pad = &isc_scaler_pad_ops,
> +};
> +
> +int isc_scaler_init(struct isc_device *isc)
> +{
> +	int ret;
> +
> +	v4l2_subdev_init(&isc->scaler_sd, &xisc_scaler_subdev_ops);
> +
> +	isc->scaler_sd.owner = THIS_MODULE;
> +	isc->scaler_sd.dev = isc->dev;
> +	snprintf(isc->scaler_sd.name, sizeof(isc->scaler_sd.name),
> +		 "atmel_isc_scaler");

I would drop 'atmel' for brevity, unless other entities have this
prefix set already

> +
> +	isc->scaler_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
> +	isc->scaler_sd.entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;
> +	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_format.height = isc->max_height;
> +	isc->scaler_format.width = isc->max_width;
> +	isc->scaler_format.code = isc->formats_list[0].mbus_code;
> +	isc->scaler_format.colorspace = V4L2_COLORSPACE_SRGB;
> +	isc->scaler_format.field = V4L2_FIELD_NONE;
> +	isc->scaler_format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> +	isc->scaler_format.quantization = V4L2_QUANTIZATION_DEFAULT;
> +	isc->scaler_format.xfer_func = V4L2_XFER_FUNC_DEFAULT;
> +
> +	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) {
> +		v4l2_err(&isc->v4l2_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) {
> +		v4l2_err(&isc->v4l2_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);

>From the DT graph point of view, the ISC appears as a single block
with an CSI-2 input port. It is then in charge of parsing the .dts and
add to its notifier the image sensor remote subdevice.

When the sensor subdev registers and the ISC notifier completes, the scaler
entity which was initialized at isc_probe() time is linked in between
the ISC and the image sensor immutably.

I think it is fine for now, but I wonder if you plan to plumb more
components between the ISC video node and the sensor, if it's not
worth changing the DT bindings and their parsing logic to separate the
CSI-2 receiver from the ISC, whcih can create its media graph at probe
time and have the CSI-2 receiver entity as downstream remote. I think
I need to get to know the ISC better to really have an idea. For now,
this seems ok to me, but please check with maintainers if this is fine
with them.

> +
> diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
> index 5fbf52a9080b..c9234c90ae58 100644
> --- a/drivers/media/platform/atmel/atmel-isc.h
> +++ b/drivers/media/platform/atmel/atmel-isc.h
> @@ -183,6 +183,17 @@ struct isc_reg_offsets {
>  	u32 his_entry;
>  };
>
> +enum isc_mc_pads {
> +	ISC_PAD_SINK	= 0,
> +	ISC_PADS_NUM	= 1,
> +};
> +
> +enum isc_scaler_pads {
> +	ISC_SCALER_PAD_SINK	= 0,
> +	ISC_SCALER_PAD_SOURCE	= 1,
> +	ISC_SCALER_PADS_NUM	= 2,
> +};
> +
>  /*
>   * struct isc_device - ISC device driver data/config struct
>   * @regmap:		Register map
> @@ -257,6 +268,12 @@ struct isc_reg_offsets {
>   *			be used as an input to the controller
>   * @controller_formats_size:	size of controller_formats array
>   * @formats_list_size:	size of formats_list array
> + * @pads:		media controller pads for isc video entity
> + * @mdev:		media device that is registered by the isc
> + * @remote_pad:		remote pad on the connected subdevice
> + * @scaler_sd:		subdevice for the scaler that isc registers
> + * @scaler_pads:	media controller pads for the scaler subdevice
> + * @scaler_format:	current format for the scaler subdevice
>   */
>  struct isc_device {
>  	struct regmap		*regmap;
> @@ -344,6 +361,19 @@ struct isc_device {
>  	struct isc_format		*formats_list;
>  	u32				controller_formats_size;
>  	u32				formats_list_size;
> +
> +	struct {
> +		struct media_pad		pads[ISC_PADS_NUM];
> +		struct media_device		mdev;
> +
> +		u32				remote_pad;
> +	};
> +
> +	struct {
> +		struct v4l2_subdev		scaler_sd;
> +		struct media_pad		scaler_pads[ISC_SCALER_PADS_NUM];
> +		struct v4l2_mbus_framefmt	scaler_format;
> +	};
>  };
>
>  extern const struct regmap_config isc_regmap_config;
> @@ -355,4 +385,11 @@ int isc_clk_init(struct isc_device *isc);
>  void isc_subdev_cleanup(struct isc_device *isc);
>  void isc_clk_cleanup(struct isc_device *isc);
>
> +int isc_scaler_link(struct isc_device *isc);
> +int isc_scaler_init(struct isc_device *isc);
> +int isc_mc_init(struct isc_device *isc, u32 ver);
> +void isc_mc_cleanup(struct isc_device *isc);
> +
> +struct isc_format *isc_find_format_by_code(struct isc_device *isc,
> +					   unsigned int code, int *index);
>  #endif
> diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> index c5b9563e36cb..c244682ea22f 100644
> --- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> +++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> @@ -553,6 +553,12 @@ static int atmel_isc_probe(struct platform_device *pdev)
>  			break;
>  	}
>
> +	regmap_read(isc->regmap, ISC_VERSION + isc->offsets.version, &ver);

I am surprised you can read a register before runtime_pm is
intialized!

Thanks
   j


> +
> +	ret = isc_mc_init(isc, ver);
> +	if (ret < 0)
> +		goto isc_probe_mc_init_err;
> +
>  	pm_runtime_set_active(dev);
>  	pm_runtime_enable(dev);
>  	pm_request_idle(dev);
> @@ -562,7 +568,7 @@ static int atmel_isc_probe(struct platform_device *pdev)
>  	ret = clk_prepare_enable(isc->ispck);
>  	if (ret) {
>  		dev_err(dev, "failed to enable ispck: %d\n", ret);
> -		goto cleanup_subdev;
> +		goto isc_probe_mc_init_err;
>  	}
>
>  	/* ispck should be greater or equal to hclock */
> @@ -572,7 +578,6 @@ static int atmel_isc_probe(struct platform_device *pdev)
>  		goto unprepare_clk;
>  	}
>
> -	regmap_read(isc->regmap, ISC_VERSION + isc->offsets.version, &ver);
>  	dev_info(dev, "Microchip ISC version %x\n", ver);
>
>  	return 0;
> @@ -580,6 +585,9 @@ static int atmel_isc_probe(struct platform_device *pdev)
>  unprepare_clk:
>  	clk_disable_unprepare(isc->ispck);
>
> +isc_probe_mc_init_err:
> +	isc_mc_cleanup(isc);
> +
>  cleanup_subdev:
>  	isc_subdev_cleanup(isc);
>
> @@ -600,6 +608,8 @@ static int atmel_isc_remove(struct platform_device *pdev)
>
>  	pm_runtime_disable(&pdev->dev);
>
> +	isc_mc_cleanup(isc);
> +
>  	isc_subdev_cleanup(isc);
>
>  	v4l2_device_unregister(&isc->v4l2_dev);
> diff --git a/drivers/media/platform/atmel/atmel-sama7g5-isc.c b/drivers/media/platform/atmel/atmel-sama7g5-isc.c
> index 07a80b08bc54..9dc75eed0098 100644
> --- a/drivers/media/platform/atmel/atmel-sama7g5-isc.c
> +++ b/drivers/media/platform/atmel/atmel-sama7g5-isc.c
> @@ -547,15 +547,23 @@ static int microchip_xisc_probe(struct platform_device *pdev)
>  			break;
>  	}
>
> +	regmap_read(isc->regmap, ISC_VERSION + isc->offsets.version, &ver);
> +
> +	ret = isc_mc_init(isc, ver);
> +	if (ret < 0)
> +		goto isc_probe_mc_init_err;
> +
>  	pm_runtime_set_active(dev);
>  	pm_runtime_enable(dev);
>  	pm_request_idle(dev);
>
> -	regmap_read(isc->regmap, ISC_VERSION + isc->offsets.version, &ver);
>  	dev_info(dev, "Microchip XISC version %x\n", ver);
>
>  	return 0;
>
> +isc_probe_mc_init_err:
> +	isc_mc_cleanup(isc);
> +
>  cleanup_subdev:
>  	isc_subdev_cleanup(isc);
>
> @@ -576,6 +584,8 @@ static int microchip_xisc_remove(struct platform_device *pdev)
>
>  	pm_runtime_disable(&pdev->dev);
>
> +	isc_mc_cleanup(isc);
> +
>  	isc_subdev_cleanup(isc);
>
>  	v4l2_device_unregister(&isc->v4l2_dev);
> --
> 2.25.1
>

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