by Eugen Hristev

[permalink] [raw]

Subject: Re: [PATCH v7 04/13] media: atmel: atmel-isc: implement media controller

On 3/9/22 5:57 PM, Jacopo Mondi wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> Hi Eugen
>
> On Wed, Mar 09, 2022 at 03:39:26PM +0000, [email protected] wrote:
>> On 3/9/22 5:22 PM, Jacopo Mondi wrote:
>>> Hi Eugen,
>>> sorry one more comment
>>>
>>> On Mon, Mar 07, 2022 at 02:04:14PM +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 its 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 <[email protected]>
>>>> ---
>>>> Changes in v7:
>>>> - use maximum isc frame size as bounds always
>>>>
>>>> Changes in v6:
>>>> - reworked a bit as suggested by Jacopo
>>>> - add try crops
>>>>
>>>> Changes in v5:
>>>> - reworked s_fmt to pass the same format from sink to source
>>>> - simplified enum_mbus_code
>>>> - separated tgt and bounds to report correctly in g_sel
>>>>
>>>> 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 | 75 ++++-
>>>> .../media/platform/atmel/atmel-isc-scaler.c | 271 ++++++++++++++++++
>>>> 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, 403 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 67b4a2323fed..448bf281c61a 100644
>>>> --- a/drivers/media/platform/atmel/atmel-isc-base.c
>>>> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
>>>> @@ -1712,6 +1712,7 @@ 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");
>>>> @@ -1720,6 +1721,16 @@ 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;
>>>> }
>>>>
>>>> @@ -1734,8 +1745,8 @@ 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;
>>>> @@ -1751,6 +1762,7 @@ 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)
>>>> {
>>>> @@ -1767,7 +1779,7 @@ 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);
>>>> @@ -1893,7 +1905,8 @@ 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);
>>>> @@ -1903,8 +1916,19 @@ 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;
>>>> @@ -1971,6 +1995,49 @@ 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;
>>>> + 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);
>>>> + media_device_cleanup(&isc->mdev);
>>>> +}
>>>> +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..d3dd131fdae0
>>>> --- /dev/null
>>>> +++ b/drivers/media/platform/atmel/atmel-isc-scaler.c
>>>> @@ -0,0 +1,271 @@
>>>> +// SPDX-License-Identifier: GPL-2.0-only
>>>> +/*
>>>> + * Microchip Image Sensor Controller (ISC) Scaler entity support
>>>> + *
>>>> + * Copyright (C) 2022 Microchip Technology, Inc.
>>>> + *
>>>> + * Author: Eugen Hristev <[email protected]>
>>>> + *
>>>> + */
>>>> +
>>>> +#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 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_get_try_format(sd, 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_get_try_format(sd, 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_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[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) {
>>>> + /* bounds are the maximum rectangle which ISC can take */
>>>> + sel->r.height = isc->max_height;
>>>> + sel->r.width = isc->max_width;
>>>> + sel->r.left = 0;
>>>> + sel->r.top = 0;
>>>
>>> Sorry in my previous reply I suggested to fix _BOUND to the max size, but
>>> what happens if the image format on the sink pad is smaller than max
>>> size ? As _BOUNDS should contains all valid crop rectangles and you
>>> don't have a set_selection which might change the CROP rectangle , I
>>> think for your case BOUND==CROP, otherwise you could end up with a
>>> BOUND rectangle larger than the input frame.
>>>
>>> I would do something along the lines of:
>>>
>>> switch (sel->target) {
>>> case V4L2_SEL_TGT_CROP_BOUNDS:
>>> /* Fall-through */
>>> case V4L2_SEL_TGT_CROP:
>>> /*
>>> * crop is done to the output format,
>>> * limited by ISC maximum size
>>> */
>>> 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;
>>> default:
>>> return -EINVAL;
>>>
>>
>> Hi Jacopo,
>>
>> Actually this is now much similar with what I initially had , in v4 of
>> the patch :
>>
>> =====
>>
>> +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;
>> +
>> + sel->r.left = 0;
>> + sel->r.top = 0;
>> +
>> + return 0;
>> +}
>> =====
>
> More or less, as in this case you had both rectangles set to max_size.
> But you're right you had BOUND == CROP. Sorry about this.
>
>>
>> In there I was setting height and width to maximum isc frame size, but I
>> will change it to source pad format size.
>> Do you like it like this ?
>>
>> =====
>>
>> 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;
>> =====
>
> Thanks this match my understanding.
> Please add my tag to v8 and sorry again for the back&forth.

No problem. I am preparing v8

Thanks !
>
> Cheers
> j
>>
>> Eugen
>>
>>>
>>> I'm sorry if this will require you a new version, I missed that in v6.
>>> Please let me know if you agree with my proposal.
>>>
>>> Feel free to add the tag in v8
>>> Reviewed-by: Jacopo Mondi <[email protected]>
>>>
>>> Thanks
>>> j
>>>
>>>> + } else if (sel->target == V4L2_SEL_TGT_CROP) {
>>>> + /*
>>>> + * crop is done to the output format,
>>>> + * limited by ISC maximum size
>>>> + */
>>>> + 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;
>>>> + } else {
>>>> + return -EINVAL;
>>>> + }
>>>> +
>>>> + 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 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_get_try_crop(sd, 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,
>>>> + .init_cfg = isc_scaler_init_cfg,
>>>> +};
>>>> +
>>>> +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");
>>>> +
>>>> + 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_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);
>>>> +
>>>> diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
>>>> index f9ad7ec6bd13..9cc69c3ae26d 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
>>>> @@ -258,6 +269,12 @@ 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;
>>>> @@ -346,6 +363,19 @@ 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[ISC_SCALER_PADS_NUM];
>>>> + };
>>>> };
>>>>
>>>> extern const struct regmap_config isc_regmap_config;
>>>> @@ -357,4 +387,11 @@ 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);
>>>> +
>>>> + 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
>>>>
>>