Re: [RFC PATCH v2 3/4] media: platform: Add CRU driver for RZ/G2L SoC

Jacopo Mondi
2022-02-15T14:39:20Z

Hello Prabhakar,

On Fri, Jan 21, 2022 at 01:05:42AM +0000, Lad Prabhakar wrote:
> Add v4l driver for Renesas RZ/G2L Camera data Receiving Unit.
>
> Based on a patch in the BSP by Hien Huynh
> <hien.huynh.px@renesas.com>
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> v1->v2
> * Dropped group
> * Dropped CSI subdev and implemented as new driver
> * Dropped "mc_" from function names
> * Moved the driver to renesas folder
> ---
> drivers/media/platform/Kconfig | 1 +
> drivers/media/platform/Makefile | 2 +
> .../media/platform/renesas/rzg2l-cru/Kconfig | 15 +
> .../media/platform/renesas/rzg2l-cru/Makefile | 4 +
> .../platform/renesas/rzg2l-cru/rzg2l-core.c | 432 +++++++++++
> .../platform/renesas/rzg2l-cru/rzg2l-cru.h | 155 ++++
> .../platform/renesas/rzg2l-cru/rzg2l-dma.c | 722 ++++++++++++++++++
> .../platform/renesas/rzg2l-cru/rzg2l-v4l2.c | 360 +++++++++

Niklas, Laurent, this series introduces drivers/media/platform/renesas

Should the several renesas driver be moved there ?

In that case I would suggest a
drivers/media/platform/renesas/Kconfig|Makefile instead of instructing
drivers/media/Kconfig|Makefile to fish in
drivers/media/platform/renesas/rzg2l-cru/

> 8 files changed, 1691 insertions(+)
> create mode 100644 drivers/media/platform/renesas/rzg2l-cru/Kconfig
> create mode 100644 drivers/media/platform/renesas/rzg2l-cru/Makefile
> create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
> create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
> create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c
> create mode 100644 drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c
>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index cf4adc64c953..4251c5686c2a 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -169,6 +169,7 @@ source "drivers/media/platform/exynos4-is/Kconfig"
> source "drivers/media/platform/am437x/Kconfig"
> source "drivers/media/platform/xilinx/Kconfig"
> source "drivers/media/platform/rcar-vin/Kconfig"
> +source "drivers/media/platform/renesas/rzg2l-cru/Kconfig"
> source "drivers/media/platform/atmel/Kconfig"
> source "drivers/media/platform/sunxi/Kconfig"
>
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index a148553babfc..021d30a2c66c 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -66,6 +66,8 @@ obj-$(CONFIG_VIDEO_XILINX) += xilinx/
> obj-$(CONFIG_VIDEO_RCAR_ISP) += rcar-isp.o
> obj-$(CONFIG_VIDEO_RCAR_VIN) += rcar-vin/
>
> +obj-$(CONFIG_VIDEO_RZG2L_CRU) += renesas/rzg2l-cru/
> +
> obj-$(CONFIG_VIDEO_ATMEL_ISC) += atmel/
> obj-$(CONFIG_VIDEO_ATMEL_ISI) += atmel/
> obj-$(CONFIG_VIDEO_ATMEL_XISC) += atmel/
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/Kconfig b/drivers/media/platform/renesas/rzg2l-cru/Kconfig
> new file mode 100644
> index 000000000000..310baa4d4c14
> --- /dev/null
> +++ b/drivers/media/platform/renesas/rzg2l-cru/Kconfig
> @@ -0,0 +1,15 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +config VIDEO_RZG2L_CRU
> + tristate "RZ/G2L Camera Receiving Unit (CRU) Driver"
> + depends on VIDEO_V4L2 && OF
> + depends on ARCH_RENESAS || COMPILE_TEST
> + select MEDIA_CONTROLLER
> + select VIDEO_V4L2_SUBDEV_API
> + select VIDEOBUF2_DMA_CONTIG
> + select V4L2_FWNODE
> + help
> + Support for Renesas RZ/G2L Camera Receiving Unit (CRU) driver.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called rzg2l-cru.
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/Makefile b/drivers/media/platform/renesas/rzg2l-cru/Makefile
> new file mode 100644
> index 000000000000..8c307075f131
> --- /dev/null
> +++ b/drivers/media/platform/renesas/rzg2l-cru/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0
> +rzg2l-cru-objs = rzg2l-core.o rzg2l-dma.o rzg2l-v4l2.o
> +
> +obj-$(CONFIG_VIDEO_RZG2L_CRU) += rzg2l-cru.o
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
> new file mode 100644
> index 000000000000..881bedaaff8f
> --- /dev/null
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-core.c
> @@ -0,0 +1,432 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Driver for Renesas RZ/G2L CRU
> + *
> + * Copyright (C) 2022 Renesas Electronics Corp.
> + *
> + * Based on Renesas R-Car VIN
> + * Copyright (C) 2011-2013 Renesas Solutions Corp.
> + * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com>
> + * Copyright (C) 2008 Magnus Damm
> + */
> +
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>

<linux/mod_devicetable.h> for struct of_device_id.
Even if I assume it's included by other headers

> +#include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/slab.h>

Is slab.h needed ?

> +#include <linux/sys_soc.h>

Also sys_soc.h seems not needed

> +
> +#include <media/v4l2-async.h>

v4l2-async is included by rzg2l-cru.h

> +#include <media/v4l2-fwnode.h>
> +#include <media/v4l2-mc.h>
> +
> +#include "rzg2l-cru.h"
> +
> +#define v4l2_dev_to_cru(d) container_of(d, struct rzg2l_cru_dev, v4l2_dev)
> +
> +static int rzg2l_cru_csi2_link_notify(struct media_link *link, u32 flags,
> + unsigned int notification)
> +{
> + struct media_entity *entity;
> + struct rzg2l_cru_dev *cru;
> + struct video_device *vdev;
> + struct media_pad *csi_pad;
> + struct v4l2_subdev *sd;
> + int ret;
> +
> + ret = v4l2_pipeline_link_notify(link, flags, notification);
> + if (ret)
> + return ret;
> +
> + /* Only care about link enablement for CRU nodes. */
> + if (!(flags & MEDIA_LNK_FL_ENABLED) ||
> + !is_media_entity_v4l2_video_device(link->sink->entity))

Can you get a notification for an entity which is not your video
device one ?

> + return 0;
> +
> + cru = container_of(link->graph_obj.mdev, struct rzg2l_cru_dev, mdev);
> + /*
> + * Don't allow link changes if any entity in the graph is
> + * streaming, modifying the CHSEL register fields can disrupt
> + * running streams.
> + */
> + media_device_for_each_entity(entity, &cru->mdev)
> + if (entity->pads->stream_count)
> + return -EBUSY;
> +
> + mutex_lock(&cru->mdev_lock);
> + vdev = media_entity_to_video_device(link->sink->entity);
> +
> + csi_pad = media_entity_remote_pad(&cru->vdev.entity.pads[0]);
> + if (csi_pad) {
> + ret = -EMLINK;
> + goto out;
> + }
> +
> + sd = media_entity_to_v4l2_subdev(link->source->entity);
> + if (cru->csi.subdev == sd) {
> + cru->csi.channel = link->source->index - 1;

So the virtual channel selection is done based on the CSI-2 source pad
number connected to single video dev sink pad.

I then wonder what the rzg2l_csi2_get_frame_desc() is used for (since
it is not called from here afaict).

I think, since there doesn't seem to be any complex routing in the CRU
as there is in VINs, that the VC the CSI-2 rx receives as input should
be propagated to this driver by inspecting the CSI-2 frame desc ? Or
is there any routing I have missed like there is one between the R-Car
CSI-2 rx and R-Car VIN ?

In the R-Car VIN driver the links setup between
csi-2 and vin serves to set-up the pixel link and route data between
the CSI-2 and the VIN but here it seems the CRU wants the virtual
channel as received from the CSI-2 rx ?

VCSEL[1:0]
Specify a virtual channel to be processed by the image processing module.
A single channel specified by the register is selected from virtual channels 0 to 3.

As the CRU can capture one VC at the time if I got it right.

> + cru->is_csi = true;
> + } else {
> + ret = -ENODEV;

So using a parallel sensor would return -ENODEV ?

> + }
> +
> +out:
> + mutex_unlock(&cru->mdev_lock);
> +
> + return ret;
> +}
> +
> +static const struct media_device_ops rzg2l_cru_media_ops = {
> + .link_notify = rzg2l_cru_csi2_link_notify,
> +};
> +
> +static void rzg2l_cru_put(struct rzg2l_cru_dev *cru)
> +{
> + mutex_lock(&cru->mdev_lock);
> + cru->v4l2_dev.mdev = NULL;
> + mutex_unlock(&cru->mdev_lock);
> +}

Called from a single place, could be open coded and I'm not sure it
needs any locking, as the single caller is in the driver probe() call
path

> +
> +/* -----------------------------------------------------------------------------
> + * Group async notifier
> + */
> +
> +static int rzg2l_cru_group_notify_complete(struct v4l2_async_notifier *notifier)

Compared to R-Car VIN, where the CSI-2 rx instances can be routed to
several VINs, don't the CRU and CSI-2 rx for the RZ/GL always go
together. IOW will there be multiple CSI-2 rx instances connected to a
single CRU ? If not, this can be simplified and the whole concept of
'group' can be removed ?

> +{
> + struct rzg2l_cru_dev *cru = v4l2_dev_to_cru(notifier->v4l2_dev);
> + unsigned int i;
> + int ret;
> +
> + ret = media_device_register(&cru->mdev);
> + if (ret)
> + return ret;
> +
> + ret = v4l2_device_register_subdev_nodes(&cru->v4l2_dev);
> + if (ret) {
> + dev_err(cru->dev, "Failed to register subdev nodes\n");
> + return ret;
> + }
> +
> + if (!video_is_registered(&cru->vdev)) {
> + ret = rzg2l_cru_v4l2_register(cru);
> + if (ret)
> + return ret;
> + }
> +
> + /* Create all media device links between CRU and CSI-2's. */
> + for (i = 1; i <= CSI2_VCHANNEL; i++) {
> + struct media_entity *source, *sink;
> +
> + source = &cru->csi.subdev->entity;
> + sink = &cru->vdev.entity;
> +
> + ret = media_create_pad_link(source, i, sink, 0, 0);
> + if (ret) {
> + dev_err(cru->dev, "Error adding link from %s to %s\n",
> + source->name, sink->name);
> + break;
> + }
> + }
> +
> + return ret;
> +}
> +
> +static void rzg2l_cru_group_notify_unbind(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd)
> +{
> + struct rzg2l_cru_dev *cru = v4l2_dev_to_cru(notifier->v4l2_dev);
> +
> + rzg2l_cru_v4l2_unregister(cru);
> +
> + mutex_lock(&cru->mdev_lock);

Is locking needed ?
> +
> + if (cru->csi.asd == asd) {
> + cru->csi.subdev = NULL;
> + dev_dbg(cru->dev, "Unbind CSI-2 %s\n", subdev->name);
> + }
> +
> + mutex_unlock(&cru->mdev_lock);
> +
> + media_device_unregister(&cru->mdev);
> +}
> +
> +static int rzg2l_cru_group_notify_bound(struct v4l2_async_notifier *notifier,
> + struct v4l2_subdev *subdev,
> + struct v4l2_async_subdev *asd)
> +{
> + struct rzg2l_cru_dev *cru = v4l2_dev_to_cru(notifier->v4l2_dev);
> + unsigned int i;
> +
> + mutex_lock(&cru->mdev_lock);

Is locking needed ?

> +
> + if (cru->csi.asd == asd) {
> + cru->csi.subdev = subdev;
> + dev_dbg(cru->dev, "Bound CSI-2 %s to slot %u\n", subdev->name, i);
> + }
> +
> + mutex_unlock(&cru->mdev_lock);
> +
> + return 0;
> +}
> +
> +static const struct v4l2_async_notifier_operations rzg2l_cru_async_ops = {
> + .bound = rzg2l_cru_group_notify_bound,
> + .unbind = rzg2l_cru_group_notify_unbind,
> + .complete = rzg2l_cru_group_notify_complete,
> +};
> +
> +static int rvin_mc_parse_of(struct rzg2l_cru_dev *cru, unsigned int id)
> +{
> + struct v4l2_fwnode_endpoint vep = {
> + .bus_type = V4L2_MBUS_CSI2_DPHY,
> + };
> + struct fwnode_handle *ep, *fwnode;
> + struct v4l2_async_subdev *asd;
> + int ret;
> +
> + ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(cru->dev), 1, id, 0);
> + if (!ep)
> + return 0;
> +
> + fwnode = fwnode_graph_get_remote_endpoint(ep);
> + ret = v4l2_fwnode_endpoint_parse(ep, &vep);
> + fwnode_handle_put(ep);
> + if (ret) {
> + dev_err(cru->dev, "Failed to parse %pOF\n", to_of_node(fwnode));
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + if (!of_device_is_available(to_of_node(fwnode))) {
> + dev_dbg(cru->dev, "OF device %pOF disabled, ignoring\n",
> + to_of_node(fwnode));
> + ret = -ENOTCONN;
> + goto out;
> + }
> +
> + asd = v4l2_async_nf_add_fwnode(&cru->notifier, fwnode,
> + struct v4l2_async_subdev);
> + if (IS_ERR(asd)) {
> + ret = PTR_ERR(asd);
> + goto out;
> + }
> +
> + cru->csi.asd = asd;
> +
> + dev_dbg(cru->dev, "Added OF device %pOF to slot %u\n",
> + to_of_node(fwnode), vep.base.id);
> +out:
> + fwnode_handle_put(fwnode);
> +
> + return ret;
> +}
> +
> +static int rzg2l_cru_mc_parse_of_graph(struct rzg2l_cru_dev *cru)
> +{
> + int ret;
> +
> + v4l2_async_nf_init(&cru->notifier);
> +
> + ret = rvin_mc_parse_of(cru, 0);
> + if (ret)
> + return ret;
> +
> + cru->notifier.ops = &rzg2l_cru_async_ops;
> +
> + if (list_empty(&cru->notifier.asd_list))
> + return 0;
> +
> + ret = v4l2_async_nf_register(&cru->v4l2_dev, &cru->notifier);
> + if (ret < 0) {
> + dev_err(cru->dev, "Notifier registration failed\n");
> + v4l2_async_nf_cleanup(&cru->notifier);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int rzg2l_cru_csi2_init(struct rzg2l_cru_dev *cru)
> +{
> + struct media_device *mdev = NULL;
> + const struct of_device_id *match;
> + int ret;
> +
> + cru->pad.flags = MEDIA_PAD_FL_SINK;
> + ret = media_entity_pads_init(&cru->vdev.entity, 1, &cru->pad);
> + if (ret)
> + return ret;
> +
> + mutex_init(&cru->mdev_lock);
> + mdev = &cru->mdev;
> + mdev->dev = cru->dev;
> + mdev->ops = &rzg2l_cru_media_ops;
> +
> + match = of_match_node(cru->dev->driver->of_match_table,
> + cru->dev->of_node);
> +
> + strscpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name));
> + strscpy(mdev->model, match->compatible, sizeof(mdev->model));
> + snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
> + dev_name(mdev->dev));
> +
> + cru->v4l2_dev.mdev = &cru->mdev;
> +
> + media_device_init(mdev);
> +
> + ret = rzg2l_cru_mc_parse_of_graph(cru);
> + if (ret)
> + rzg2l_cru_put(cru);
> +
> + return 0;
> +}
> +
> +static int rzg2l_cru_s_ctrl(struct v4l2_ctrl *ctrl)
> +{
> + struct rzg2l_cru_dev *cru = container_of(ctrl->handler,
> + struct rzg2l_cru_dev,
> + ctrl_handler);
> + int ret = 0;
> +
> + switch (ctrl->id) {
> + case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:

What is the purpose of having this controllable with a ctrl ?

> + if (cru->state == RZG2L_CRU_DMA_STOPPED ||
> + cru->state == RZG2L_CRU_DMA_STOPPING)
> + cru->num_buf = ctrl->val;
> + else
> + ret = -EBUSY;
> +
> + break;
> + }
> +
> + return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops rzg2l_cru_ctrl_ops = {
> + .s_ctrl = rzg2l_cru_s_ctrl,
> +};
> +
> +static int rzg2l_cru_probe(struct platform_device *pdev)
> +{
> + struct rzg2l_cru_dev *cru;
> + struct v4l2_ctrl *ctrl;
> + int irq, ret;
> +
> + cru = devm_kzalloc(&pdev->dev, sizeof(*cru), GFP_KERNEL);
> + if (!cru)
> + return -ENOMEM;
> +
> + cru->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(cru->base))
> + return PTR_ERR(cru->base);
> +
> + cru->presetn = devm_reset_control_get(&pdev->dev, "presetn");
> + if (IS_ERR(cru->presetn))
> + return dev_err_probe(&pdev->dev, PTR_ERR(cru->presetn),
> + "failed to get cpg presetn\n");
> +
> + cru->aresetn = devm_reset_control_get(&pdev->dev, "aresetn");
> + if (IS_ERR(cru->aresetn))
> + return dev_err_probe(&pdev->dev, PTR_ERR(cru->aresetn),
> + "failed to get cpg aresetn\n");
> +
> + cru->dev = &pdev->dev;
> + cru->info = of_device_get_match_data(&pdev->dev);
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0)
> + return irq;
> +
> + ret = rzg2l_cru_dma_register(cru, irq);
> + if (ret)
> + return ret;
> +
> + platform_set_drvdata(pdev, cru);
> +
> + ret = rzg2l_cru_csi2_init(cru);
> + if (ret)
> + goto error_dma_unregister;
> +
> + v4l2_ctrl_handler_init(&cru->ctrl_handler, 1);
> + ctrl = v4l2_ctrl_new_std(&cru->ctrl_handler, &rzg2l_cru_ctrl_ops,
> + V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
> + 1, HW_BUFFER_MAX, 1, HW_BUFFER_DEFAULT);
> + if (cru->ctrl_handler.error) {
> + dev_err(&pdev->dev, "%s: control initialization error %d\n",
> + __func__, cru->ctrl_handler.error);
> + ret = cru->ctrl_handler.error;
> + goto free_ctrl;
> + }
> +
> + ctrl->flags &= ~V4L2_CTRL_FLAG_READ_ONLY;

Is this necessary ?

> + cru->v4l2_dev.ctrl_handler = &cru->ctrl_handler;
> +
> + cru->num_buf = HW_BUFFER_DEFAULT;
> +
> + pm_suspend_ignore_children(&pdev->dev, true);
> + pm_runtime_enable(&pdev->dev);

Are there pm_runtime operations associated with this driver ?

> +
> + return 0;
> +
> +free_ctrl:
> + v4l2_ctrl_handler_free(&cru->ctrl_handler);
> +error_dma_unregister:
> + rzg2l_cru_dma_unregister(cru);
> +
> + return ret;
> +}
> +
> +static const struct rzg2l_cru_info rzg2l_cru_info_generic = {
> + .max_width = 2800,
> + .max_height = 4096,
> +};

This implies you expect different revisions to have differe input size
limitations, right ?

> +
> +static const struct of_device_id rzg2l_cru_of_id_table[] = {
> + {
> + .compatible = "renesas,rzg2l-cru",
> + .data = &rzg2l_cru_info_generic,
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rzg2l_cru_of_id_table);
> +
> +static int rzg2l_cru_remove(struct platform_device *pdev)
> +{
> + struct rzg2l_cru_dev *cru = platform_get_drvdata(pdev);
> +
> + pm_runtime_disable(&pdev->dev);
> +
> + rzg2l_cru_v4l2_unregister(cru);
> +
> + v4l2_async_nf_unregister(&cru->notifier);
> + v4l2_async_nf_cleanup(&cru->notifier);
> +
> + media_device_cleanup(&cru->mdev);
> + mutex_destroy(&cru->mdev_lock);
> + cru->v4l2_dev.mdev = NULL;
> +
> + v4l2_ctrl_handler_free(&cru->ctrl_handler);
> + cru->vdev.ctrl_handler = NULL;
> +
> + rzg2l_cru_dma_unregister(cru);
> +
> + return 0;
> +}
> +
> +static struct platform_driver rzg2l_cru_driver = {
> + .driver = {
> + .name = "rzg2l-cru",
> + .of_match_table = rzg2l_cru_of_id_table,
> + },
> + .probe = rzg2l_cru_probe,
> + .remove = rzg2l_cru_remove,
> +};
> +
> +module_platform_driver(rzg2l_cru_driver);
> +
> +MODULE_DESCRIPTION("Renesas RZ/G2L CRU driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
> new file mode 100644
> index 000000000000..91a28279846e
> --- /dev/null
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-cru.h
> @@ -0,0 +1,155 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Driver for Renesas RZ/G2L CRU
> + *
> + * Copyright (C) 2022 Renesas Electronics Corp.
> + *
> + */
> +
> +#ifndef __RZG2L_CRU__
> +#define __RZG2L_CRU__
> +
> +#include <linux/clk.h>
> +#include <linux/reset.h>
> +
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-dev.h>
> +#include <media/v4l2-device.h>
> +#include <media/videobuf2-v4l2.h>
> +
> +/* Number of HW buffers */
> +#define HW_BUFFER_MAX 8
> +#define HW_BUFFER_DEFAULT 3
> +
> +/* Address alignment mask for HW buffers */
> +#define HW_BUFFER_MASK 0x1ff
> +
> +/* Maximum number of CSI2 virtual channels */
> +#define CSI2_VCHANNEL 4
> +
> +/**
> + * enum rzg2l_cru_dma_state - DMA states
> + * @RZG2L_CRU_DMA_STOPPED: No operation in progress
> + * @RZG2L_CRU_DMA_STARTING: Capture starting up
> + * @RZG2L_CRU_DMA_RUNNING: Operation in progress have buffers
> + * @RZG2L_CRU_DMA_STOPPING: Stopping operation
> + */
> +enum rzg2l_cru_dma_state {
> + RZG2L_CRU_DMA_STOPPED = 0,
> + RZG2L_CRU_DMA_STARTING,
> + RZG2L_CRU_DMA_RUNNING,
> + RZG2L_CRU_DMA_STOPPING,
> +};
> +
> +/**
> + * struct rzg2l_cru_info - Information about the particular CRU implementation
> + * @max_width: max input width the CRU supports
> + * @max_height: max input height the CRU supports
> + */
> +struct rzg2l_cru_info {
> + unsigned int max_width;
> + unsigned int max_height;
> +};
> +
> +struct rzg2l_cru_csi {
> + struct v4l2_async_subdev *asd;
> + struct v4l2_subdev *subdev;
> + u32 channel;
> +};
> +
> +/**
> + * struct rzg2l_cru_dev - Renesas CRU device structure
> + * @dev: (OF) device
> + * @base: device I/O register space remapped to virtual memory
> + * @info: info about CRU instance
> + *
> + * @presetn: CRU_PRESETN reset line
> + * @aresetn: CRU_ARESETN reset line
> + *
> + * @vdev: V4L2 video device associated with CRU
> + * @v4l2_dev: V4L2 device
> + * @ctrl_handler: V4L2 control handler
> + * @num_buf: Holds the current number of buffers enabled
> + * @notifier: V4L2 asynchronous subdevs notifier
> + *
> + * @csi: CSI info
> + * @mdev: media device
> + * @mdev_lock: protects the count, notifier and csi members
> + * @pad: media pad for the video device entity
> + *
> + * @lock: protects @queue
> + * @queue: vb2 buffers queue
> + * @scratch: cpu address for scratch buffer
> + * @scratch_phys: physical address of the scratch buffer
> + *
> + * @qlock: protects @queue_buf, @buf_list, @sequence
> + * @state
> + * @queue_buf: Keeps track of buffers given to HW slot
> + * @buf_list: list of queued buffers
> + * @sequence: V4L2 buffers sequence number
> + * @state: keeps track of operation state
> + *
> + * @is_csi: flag to mark the CRU as using a CSI-2 subdevice
> + *
> + * @input_is_yuv: flag to mark the input format of CRU
> + * @output_is_yuv: flag to mark the output format of CRU
> + *
> + * @mbus_code: media bus format code
> + * @format: active V4L2 pixel format
> + *
> + * @compose: active composing
> + * @source: active size of the video source
> + * @std: active video standard of the video source

These last fields seems not to be present in the structure

> + */
> +struct rzg2l_cru_dev {
> + struct device *dev;
> + void __iomem *base;
> + const struct rzg2l_cru_info *info;
> +
> + struct reset_control *presetn;
> + struct reset_control *aresetn;
> +
> + struct video_device vdev;
> + struct v4l2_device v4l2_dev;
> + struct v4l2_ctrl_handler ctrl_handler;
> + u8 num_buf;
> +
> + struct v4l2_async_notifier notifier;
> +
> + struct rzg2l_cru_csi csi;
> + struct media_device mdev;
> + struct mutex mdev_lock;
> + struct media_pad pad;
> +
> + struct mutex lock;
> + struct vb2_queue queue;
> + void *scratch;
> + dma_addr_t scratch_phys;
> +
> + spinlock_t qlock;
> + struct vb2_v4l2_buffer *queue_buf[HW_BUFFER_MAX];
> + struct list_head buf_list;
> + unsigned int sequence;
> + enum rzg2l_cru_dma_state state;
> +
> + bool is_csi;
> +
> + bool input_is_yuv;
> + bool output_is_yuv;
> +
> + u32 mbus_code;
> + struct v4l2_pix_format format;
> +
> + struct v4l2_rect compose;
> +};
> +
> +int rzg2l_cru_dma_register(struct rzg2l_cru_dev *cru, int irq);
> +void rzg2l_cru_dma_unregister(struct rzg2l_cru_dev *cru);
> +
> +int rzg2l_cru_v4l2_register(struct rzg2l_cru_dev *cru);
> +void rzg2l_cru_v4l2_unregister(struct rzg2l_cru_dev *cru);
> +
> +const struct v4l2_format_info *rzg2l_cru_format_from_pixel(u32 format);
> +
> +#endif
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c
> new file mode 100644
> index 000000000000..0fcf4baccca9
> --- /dev/null
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-dma.c
> @@ -0,0 +1,722 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Driver for Renesas RZ/G2L CRU
> + *
> + * Copyright (C) 2022 Renesas Electronics Corp.
> + *
> + * Based on Renesas R-Car VIN
> + * Copyright (C) 2011-2013 Renesas Solutions Corp.
> + * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com>
> + * Copyright (C) 2008 Magnus Damm
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/pm_runtime.h>
> +
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "rzg2l-cru.h"
> +
> +/* HW CRU Registers Definition */
> +/* CRU Control Register */
> +#define CRUnCTRL 0x0
> +#define CRUnCTRL_VINSEL(x) ((x) << 0)
> +
> +/* CRU Interrupt Enable Register */
> +#define CRUnIE 0x4
> +#define CRUnIE_SFE BIT(16)
> +#define CRUnIE_EFE BIT(17)
> +
> +/* CRU Interrupt Status Register */
> +#define CRUnINTS 0x8
> +#define CRUnINTS_SFS BIT(16)
> +
> +/* CRU Reset Register */
> +#define CRUnRST 0xc
> +#define CRUnRST_VRESETN BIT(0)
> +
> +/* Memory Bank Base Address (Lower) Register for CRU Image Data */
> +#define AMnMBxADDRL(x) (0x100 + ((x) * 8))
> +
> +/* Memory Bank Base Address (Higher) Register for CRU Image Data */
> +#define AMnMBxADDRH(x) (0x104 + ((x) * 8))
> +
> +/* Memory Bank Enable Register for CRU Image Data */
> +#define AMnMBVALID 0x148
> +#define AMnMBVALID_MBVALID(x) GENMASK(x, 0)
> +
> +/* Memory Bank Status Register for CRU Image Data */
> +#define AMnMBS 0x14c
> +#define AMnMBS_MBSTS 0x7
> +
> +/* AXI Master FIFO Pointer Register for CRU Image Data */
> +#define AMnFIFOPNTR 0x168
> +#define AMnFIFOPNTR_FIFOWPNTR GENMASK(7, 0)
> +#define AMnFIFOPNTR_FIFORPNTR_Y GENMASK(23, 16)
> +
> +/* AXI Master Transfer Stop Register for CRU Image Data */
> +#define AMnAXISTP 0x174
> +#define AMnAXISTP_AXI_STOP BIT(0)
> +
> +/* AXI Master Transfer Stop Status Register for CRU Image Data */
> +#define AMnAXISTPACK 0x178
> +#define AMnAXISTPACK_AXI_STOP_ACK BIT(0)
> +
> +/* CRU Image Processing Enable Register */
> +#define ICnEN 0x200
> +#define ICnEN_ICEN BIT(0)
> +
> +/* CRU Image Processing Main Control Register */
> +#define ICnMC 0x208
> +#define ICnMC_CSCTHR BIT(5)
> +#define ICnMC_INF_YUV8_422 (0x1e << 16)
> +#define ICnMC_INF_USER (0x30 << 16)
> +#define ICnMC_VCSEL(x) ((x) << 22)
> +#define ICnMC_INF_MASK GENMASK(21, 16)
> +
> +/* CRU Module Status Register */
> +#define ICnMS 0x254
> +#define ICnMS_IA BIT(2)
> +
> +/* CRU Data Output Mode Register */
> +#define ICnDMR 0x26c
> +#define ICnDMR_YCMODE_UYVY (1 << 4)
> +
> +#define RZG2L_TIMEOUT_MS 100
> +#define RZG2L_RETRIES 10
> +
> +struct rzg2l_cru_buffer {
> + struct vb2_v4l2_buffer vb;
> + struct list_head list;
> +};
> +
> +#define to_buf_list(vb2_buffer) (&container_of(vb2_buffer, \
> + struct rzg2l_cru_buffer, \
> + vb)->list)
> +
> +static void rzg2l_cru_write(struct rzg2l_cru_dev *cru, u32 offset, u32 value)
> +{
> + iowrite32(value, cru->base + offset);
> +}
> +
> +static u32 rzg2l_cru_read(struct rzg2l_cru_dev *cru, u32 offset)
> +{
> + return ioread32(cru->base + offset);
> +}
> +
> +/* Need to hold qlock before calling */
> +static void return_unused_buffers(struct rzg2l_cru_dev *cru,
> + enum vb2_buffer_state state)
> +{
> + struct rzg2l_cru_buffer *buf, *node;
> + unsigned long flags;
> + unsigned int i;
> +
> + spin_lock_irqsave(&cru->qlock, flags);
> + for (i = 0; i < cru->num_buf; i++) {
> + if (cru->queue_buf[i]) {
> + vb2_buffer_done(&cru->queue_buf[i]->vb2_buf,
> + state);
> + cru->queue_buf[i] = NULL;
> + }
> + }
> +
> + list_for_each_entry_safe(buf, node, &cru->buf_list, list) {
> + vb2_buffer_done(&buf->vb.vb2_buf, state);
> + list_del(&buf->list);
> + }
> + spin_unlock_irqrestore(&cru->qlock, flags);
> +}
> +
> +static int rzg2l_cru_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
> + unsigned int *nplanes, unsigned int sizes[],
> + struct device *alloc_devs[])
> +{
> + struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq);
> +
> + /* Make sure the image size is large enough. */
> + if (*nplanes)
> + return sizes[0] < cru->format.sizeimage ? -EINVAL : 0;
> +
> + *nplanes = 1;
> + sizes[0] = cru->format.sizeimage;
> +
> + return 0;
> +};
> +
> +static int rzg2l_cru_buffer_prepare(struct vb2_buffer *vb)
> +{
> + struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vb->vb2_queue);
> + unsigned long size = cru->format.sizeimage;
> +
> + if (vb2_plane_size(vb, 0) < size) {
> + dev_err(cru->dev, "buffer too small (%lu < %lu)\n",
> + vb2_plane_size(vb, 0), size);
> + return -EINVAL;
> + }
> +
> + vb2_set_plane_payload(vb, 0, size);
> +
> + return 0;
> +}
> +
> +static void rzg2l_cru_buffer_queue(struct vb2_buffer *vb)
> +{
> + struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> + struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vb->vb2_queue);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&cru->qlock, flags);
> +
> + list_add_tail(to_buf_list(vbuf), &cru->buf_list);
> +
> + spin_unlock_irqrestore(&cru->qlock, flags);
> +}
> +
> +static int rzg2l_cru_mc_validate_format(struct rzg2l_cru_dev *cru,
> + struct v4l2_subdev *sd,
> + struct media_pad *pad)

Isn't this better realized by installing a custom
media_entity_operations.link_validate() operation in the vdev.entity ?

There you can call v4l2_subdev_link_validate_default() to make sure
the sizes and format on pads on each side of the link match and then
perform additiona validations like the one you have here below ?

The core will call it for you at media_pipeline_start() time.
I think it should work for vdev.entities as well as for subdev
entities ?

I'll review the rest after I understood the CSI-2 part better.

Thanks
j

> +{
> + struct v4l2_subdev_format fmt = {
> + .which = V4L2_SUBDEV_FORMAT_ACTIVE,
> + };
> +
> + fmt.pad = pad->index;
> + fmt.stream = 0;
> + if (v4l2_subdev_call(sd, pad, get_fmt, v4l2_subdev_get_active_state(sd), &fmt))
> + return -EPIPE;
> +
> + if (cru->is_csi) {
> + switch (fmt.format.code) {
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + break;
> + default:
> + return -EPIPE;
> + }
> + }
> + cru->mbus_code = fmt.format.code;
> +
> + switch (fmt.format.field) {
> + case V4L2_FIELD_TOP:
> + case V4L2_FIELD_BOTTOM:
> + case V4L2_FIELD_NONE:
> + case V4L2_FIELD_INTERLACED_TB:
> + case V4L2_FIELD_INTERLACED_BT:
> + case V4L2_FIELD_INTERLACED:
> + case V4L2_FIELD_SEQ_TB:
> + case V4L2_FIELD_SEQ_BT:
> + break;
> + default:
> + return -EPIPE;
> + }
> +
> + if (fmt.format.width != cru->format.width ||
> + fmt.format.height != cru->format.height ||
> + fmt.format.code != cru->mbus_code)
> + return -EPIPE;
> +
> + return 0;
> +}
> +
> +static void rzg2l_cru_set_slot_addr(struct rzg2l_cru_dev *cru,
> + int slot, dma_addr_t addr)
> +{
> + const struct v4l2_format_info *fmt;
> + int offsetx, offsety;
> + dma_addr_t offset;
> +
> + fmt = rzg2l_cru_format_from_pixel(cru->format.pixelformat);
> +
> + /*
> + * There is no HW support for composition do the best we can
> + * by modifying the buffer offset
> + */
> + offsetx = cru->compose.left * fmt->bpp[0];
> + offsety = cru->compose.top * cru->format.bytesperline;
> + offset = addr + offsetx + offsety;
> +
> + /*
> + * The address needs to be 512 bytes aligned. Driver should never accept
> + * settings that do not satisfy this in the first place...
> + */
> + if (WARN_ON((offsetx | offsety | offset) & HW_BUFFER_MASK))
> + return;
> +
> + /* Currently, we just use the buffer in 32 bits address */
> + rzg2l_cru_write(cru, AMnMBxADDRL(slot), offset);
> + rzg2l_cru_write(cru, AMnMBxADDRH(slot), 0);
> +}
> +
> +/*
> + * Moves a buffer from the queue to the HW slot. If no buffer is
> + * available use the scratch buffer. The scratch buffer is never
> + * returned to userspace, its only function is to enable the capture
> + * loop to keep running.
> + */
> +static void rzg2l_cru_fill_hw_slot(struct rzg2l_cru_dev *cru, int slot)
> +{
> + struct vb2_v4l2_buffer *vbuf;
> + struct rzg2l_cru_buffer *buf;
> + dma_addr_t phys_addr;
> +
> + /* A already populated slot shall never be overwritten. */
> + if (WARN_ON(cru->queue_buf[slot]))
> + return;
> +
> + dev_dbg(cru->dev, "Filling HW slot: %d\n", slot);
> +
> + if (list_empty(&cru->buf_list)) {
> + cru->queue_buf[slot] = NULL;
> + phys_addr = cru->scratch_phys;
> + } else {
> + /* Keep track of buffer we give to HW */
> + buf = list_entry(cru->buf_list.next,
> + struct rzg2l_cru_buffer, list);
> + vbuf = &buf->vb;
> + list_del_init(to_buf_list(vbuf));
> + cru->queue_buf[slot] = vbuf;
> +
> + /* Setup DMA */
> + phys_addr = vb2_dma_contig_plane_dma_addr(&vbuf->vb2_buf, 0);
> + }
> +
> + rzg2l_cru_set_slot_addr(cru, slot, phys_addr);
> +}
> +
> +static void rzg2l_cru_initialize_axi(struct rzg2l_cru_dev *cru)
> +{
> + unsigned int slot;
> +
> + /*
> + * Set image data memory banks.
> + * Currently, we will use maximum address.
> + */
> + rzg2l_cru_write(cru, AMnMBVALID, AMnMBVALID_MBVALID(cru->num_buf - 1));
> +
> + for (slot = 0; slot < cru->num_buf; slot++)
> + rzg2l_cru_fill_hw_slot(cru, slot);
> +}
> +
> +static void rzg2l_cru_csi2_setup(struct rzg2l_cru_dev *cru)
> +{
> + u32 icnmc;
> +
> + switch (cru->mbus_code) {
> + case MEDIA_BUS_FMT_UYVY8_2X8:
> + icnmc = ICnMC_INF_YUV8_422;
> + cru->input_is_yuv = true;
> + break;
> + default:
> + cru->input_is_yuv = false;
> + icnmc = ICnMC_INF_USER;
> + break;
> + }
> +
> + icnmc |= (rzg2l_cru_read(cru, ICnMC) & ~ICnMC_INF_MASK);
> +
> + /* Set virtual channel CSI2 */
> + icnmc |= ICnMC_VCSEL(cru->csi.channel);
> +
> + rzg2l_cru_write(cru, ICnMC, icnmc);
> +}
> +
> +static int rzg2l_cru_initialize_image_conv(struct rzg2l_cru_dev *cru)
> +{
> + u32 icndmr;
> +
> + if (cru->is_csi)
> + rzg2l_cru_csi2_setup(cru);
> +
> + /* Output format */
> + switch (cru->format.pixelformat) {
> + case V4L2_PIX_FMT_UYVY:
> + icndmr = ICnDMR_YCMODE_UYVY;
> + cru->output_is_yuv = true;
> + break;
> + default:
> + dev_err(cru->dev, "Invalid pixelformat (0x%x)\n",
> + cru->format.pixelformat);
> + return -EINVAL;
> + }
> +
> + /* If input and output use same colorspace, do bypass mode */
> + if (cru->output_is_yuv == cru->input_is_yuv)
> + rzg2l_cru_write(cru, ICnMC,
> + rzg2l_cru_read(cru, ICnMC) | ICnMC_CSCTHR);
> + else
> + rzg2l_cru_write(cru, ICnMC,
> + rzg2l_cru_read(cru, ICnMC) & (~ICnMC_CSCTHR));
> +
> + /* Set output data format */
> + rzg2l_cru_write(cru, ICnDMR, icndmr);
> +
> + return 0;
> +}
> +
> +static int rzg2l_cru_set_stream(struct rzg2l_cru_dev *cru, int on)
> +{
> + struct media_pipeline *pipe;
> + struct v4l2_subdev *sd;
> + struct media_pad *pad;
> + unsigned long flags;
> + int ret;
> +
> + pad = media_entity_remote_pad(&cru->pad);
> + if (!pad)
> + return -EPIPE;
> +
> + sd = media_entity_to_v4l2_subdev(pad->entity);
> +
> + if (!on) {
> + media_pipeline_stop(cru->vdev.entity.pads);
> + return v4l2_subdev_call(sd, video, s_stream, 0);
> + }
> +
> + ret = rzg2l_cru_mc_validate_format(cru, sd, pad);
> + if (ret)
> + return ret;
> +
> + spin_lock_irqsave(&cru->qlock, flags);
> +
> + /* Select a video input */
> + if (cru->is_csi)
> + rzg2l_cru_write(cru, CRUnCTRL, CRUnCTRL_VINSEL(0));
> +
> + /* Cancel the software reset for image processing block */
> + rzg2l_cru_write(cru, CRUnRST, CRUnRST_VRESETN);
> +
> + /* Disable and clear the interrupt before using */
> + rzg2l_cru_write(cru, CRUnIE, 0);
> + rzg2l_cru_write(cru, CRUnINTS, 0x001f000f);
> +
> + /* Initialize the AXI master */
> + rzg2l_cru_initialize_axi(cru);
> +
> + /* Initialize image convert */
> + ret = rzg2l_cru_initialize_image_conv(cru);
> + if (ret) {
> + spin_unlock_irqrestore(&cru->qlock, flags);
> + return ret;
> + }
> +
> + /* Enable interrupt */
> + rzg2l_cru_write(cru, CRUnIE, CRUnIE_EFE);
> +
> + /* Enable image processing reception */
> + rzg2l_cru_write(cru, ICnEN, ICnEN_ICEN);
> +
> + spin_unlock_irqrestore(&cru->qlock, flags);
> +
> + pipe = sd->entity.pads->pipe ? sd->entity.pads->pipe : &cru->vdev.pipe;
> + ret = media_pipeline_start(cru->vdev.entity.pads, pipe);
> + if (ret)
> + return ret;
> +
> + ret = v4l2_subdev_call(sd, video, s_stream, 1);
> + if (ret == -ENOIOCTLCMD)
> + ret = 0;
> + if (ret)
> + media_pipeline_stop(cru->vdev.entity.pads);
> +
> + return ret;
> +}
> +
> +static void rzg2l_cru_stop_streaming(struct rzg2l_cru_dev *cru)
> +{
> + u32 amnfifopntr, amnfifopntr_w, amnfifopntr_r_y;
> + unsigned int retries = 0;
> + unsigned long flags;
> + u32 icnms;
> +
> + cru->state = RZG2L_CRU_DMA_STOPPING;
> +
> + rzg2l_cru_set_stream(cru, 0);
> +
> + spin_lock_irqsave(&cru->qlock, flags);
> +
> + /* Enable IRQ to detect frame start reception */
> + rzg2l_cru_write(cru, CRUnINTS,
> + (~rzg2l_cru_read(cru, CRUnINTS)) | CRUnINTS_SFS);
> + rzg2l_cru_write(cru, CRUnIE, CRUnIE_SFE);
> +
> + /* Wait for streaming to stop */
> + while (retries++ < RZG2L_RETRIES) {
> + spin_unlock_irqrestore(&cru->qlock, flags);
> + msleep(RZG2L_TIMEOUT_MS);
> + spin_lock_irqsave(&cru->qlock, flags);
> + }
> +
> + icnms = rzg2l_cru_read(cru, ICnMS) & ICnMS_IA;
> + if (icnms)
> + dev_err(cru->dev, "Failed stop HW, something is seriously broken\n");
> +
> + cru->state = RZG2L_CRU_DMA_STOPPED;
> +
> + /* Stop the operation of image conversion */
> + rzg2l_cru_write(cru, ICnEN, 0);
> +
> + /* Disable and clear the interrupt */
> + rzg2l_cru_write(cru, CRUnIE, 0);
> + rzg2l_cru_write(cru, CRUnINTS, 0x001F0F0F);
> +
> + /* Wait until the FIFO becomes empty */
> + for (retries = 5; retries > 0; retries--) {
> + amnfifopntr = rzg2l_cru_read(cru, AMnFIFOPNTR);
> +
> + amnfifopntr_w = amnfifopntr & AMnFIFOPNTR_FIFOWPNTR;
> + amnfifopntr_r_y =
> + (amnfifopntr & AMnFIFOPNTR_FIFORPNTR_Y) >> 16;
> + if (amnfifopntr_w == amnfifopntr_r_y)
> + break;
> +
> + usleep_range(10, 20);
> + }
> +
> + /* Notify that FIFO is not empty here */
> + if (!retries)
> + dev_err(cru->dev, "Failed to empty FIFO\n");
> +
> + /* Stop AXI bus */
> + rzg2l_cru_write(cru, AMnAXISTP, AMnAXISTP_AXI_STOP);
> +
> + /* Wait until the AXI bus stop */
> + for (retries = 5; retries > 0; retries--) {
> + if (rzg2l_cru_read(cru, AMnAXISTPACK) &
> + AMnAXISTPACK_AXI_STOP_ACK)
> + break;
> +
> + usleep_range(10, 20);
> + };
> +
> + /* Notify that AXI bus can not stop here */
> + if (!retries)
> + dev_err(cru->dev, "Failed to stop AXI bus\n");
> +
> + /* Cancel the AXI bus stop request */
> + rzg2l_cru_write(cru, AMnAXISTP, 0);
> +
> + /* Resets the image processing module */
> + rzg2l_cru_write(cru, CRUnRST, 0);
> +
> + spin_unlock_irqrestore(&cru->qlock, flags);
> +
> + /* Set reset state */
> + reset_control_assert(cru->aresetn);
> +}
> +
> +static int rzg2l_cru_start_streaming_vq(struct vb2_queue *vq, unsigned int count)
> +{
> + struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq);
> + int ret;
> +
> + /* Release reset state */
> + ret = reset_control_deassert(cru->aresetn);
> + if (ret) {
> + dev_err(cru->dev, "failed to deassert aresetn\n");
> + return ret;
> + }
> +
> + /* Allocate scratch buffer. */
> + cru->scratch = dma_alloc_coherent(cru->dev, cru->format.sizeimage,
> + &cru->scratch_phys, GFP_KERNEL);
> + if (!cru->scratch) {
> + return_unused_buffers(cru, VB2_BUF_STATE_QUEUED);
> + dev_err(cru->dev, "Failed to allocate scratch buffer\n");
> + return -ENOMEM;
> + }
> +
> + cru->sequence = 0;
> +
> + ret = rzg2l_cru_set_stream(cru, 1);
> + if (ret) {
> + return_unused_buffers(cru, VB2_BUF_STATE_QUEUED);
> + goto out;
> + }
> +
> + cru->state = RZG2L_CRU_DMA_STARTING;
> +
> + dev_dbg(cru->dev, "Starting to capture\n");
> +
> +out:
> + if (ret)
> + dma_free_coherent(cru->dev, cru->format.sizeimage, cru->scratch,
> + cru->scratch_phys);
> +
> + return ret;
> +}
> +
> +static void rzg2l_cru_stop_streaming_vq(struct vb2_queue *vq)
> +{
> + struct rzg2l_cru_dev *cru = vb2_get_drv_priv(vq);
> +
> + rzg2l_cru_stop_streaming(cru);
> +
> + /* Free scratch buffer */
> + dma_free_coherent(cru->dev, cru->format.sizeimage, cru->scratch,
> + cru->scratch_phys);
> +
> + return_unused_buffers(cru, VB2_BUF_STATE_ERROR);
> +}
> +
> +static const struct vb2_ops rzg2l_cru_qops = {
> + .queue_setup = rzg2l_cru_queue_setup,
> + .buf_prepare = rzg2l_cru_buffer_prepare,
> + .buf_queue = rzg2l_cru_buffer_queue,
> + .start_streaming = rzg2l_cru_start_streaming_vq,
> + .stop_streaming = rzg2l_cru_stop_streaming_vq,
> + .wait_prepare = vb2_ops_wait_prepare,
> + .wait_finish = vb2_ops_wait_finish,
> +};
> +
> +static irqreturn_t rzg2l_cru_irq(int irq, void *data)
> +{
> + struct rzg2l_cru_dev *cru = data;
> + unsigned int handled = 0;
> + unsigned long flags;
> + u32 irq_status;
> + u32 amnmbs;
> + int slot;
> +
> + spin_lock_irqsave(&cru->qlock, flags);
> +
> + irq_status = rzg2l_cru_read(cru, CRUnINTS);
> + if (!irq_status)
> + goto done;
> +
> + handled = 1;
> +
> + rzg2l_cru_write(cru, CRUnINTS, rzg2l_cru_read(cru, CRUnINTS));
> +
> + /* Nothing to do if capture status is 'RZG2L_CRU_DMA_STOPPED' */
> + if (cru->state == RZG2L_CRU_DMA_STOPPED) {
> + dev_dbg(cru->dev, "IRQ while state stopped\n");
> + goto done;
> + }
> +
> + /* Increase stop retries if capture status is 'RZG2L_CRU_DMA_STOPPING' */
> + if (cru->state == RZG2L_CRU_DMA_STOPPING) {
> + if (irq_status & CRUnINTS_SFS)
> + dev_dbg(cru->dev, "IRQ while state stopping\n");
> + goto done;
> + }
> +
> + /* Prepare for capture and update state */
> + amnmbs = rzg2l_cru_read(cru, AMnMBS);
> + slot = amnmbs & AMnMBS_MBSTS;
> +
> + /*
> + * AMnMBS.MBSTS indicates the destination of Memory Bank (MB).
> + * Recalculate to get the current transfer complete MB.
> + */
> + if (slot == 0)
> + slot = cru->num_buf - 1;
> + else
> + slot--;
> +
> + /*
> + * To hand buffers back in a known order to userspace start
> + * to capture first from slot 0.
> + */
> + if (cru->state == RZG2L_CRU_DMA_STARTING) {
> + if (slot != 0) {
> + dev_dbg(cru->dev, "Starting sync slot: %d\n", slot);
> + goto done;
> + }
> +
> + dev_dbg(cru->dev, "Capture start synced!\n");
> + cru->state = RZG2L_CRU_DMA_RUNNING;
> + }
> +
> + /* Capture frame */
> + if (cru->queue_buf[slot]) {
> + cru->queue_buf[slot]->field = cru->format.field;
> + cru->queue_buf[slot]->sequence = cru->sequence;
> + cru->queue_buf[slot]->vb2_buf.timestamp = ktime_get_ns();
> + vb2_buffer_done(&cru->queue_buf[slot]->vb2_buf,
> + VB2_BUF_STATE_DONE);
> + cru->queue_buf[slot] = NULL;
> + } else {
> + /* Scratch buffer was used, dropping frame. */
> + dev_dbg(cru->dev, "Dropping frame %u\n", cru->sequence);
> + }
> +
> + cru->sequence++;
> +
> + /* Prepare for next frame */
> + rzg2l_cru_fill_hw_slot(cru, slot);
> +
> +done:
> + spin_unlock_irqrestore(&cru->qlock, flags);
> +
> + return IRQ_RETVAL(handled);
> +}
> +
> +void rzg2l_cru_dma_unregister(struct rzg2l_cru_dev *cru)
> +{
> + mutex_destroy(&cru->lock);
> +
> + v4l2_device_unregister(&cru->v4l2_dev);
> + reset_control_assert(cru->presetn);
> +}
> +
> +int rzg2l_cru_dma_register(struct rzg2l_cru_dev *cru, int irq)
> +{
> + struct vb2_queue *q = &cru->queue;
> + unsigned int i;
> + int ret;
> +
> + ret = reset_control_deassert(cru->presetn);
> + if (ret) {
> + dev_err(cru->dev, "failed to deassert presetn\n");
> + return ret;
> + }
> +
> + /* Initialize the top-level structure */
> + ret = v4l2_device_register(cru->dev, &cru->v4l2_dev);
> + if (ret)
> + return ret;
> +
> + mutex_init(&cru->lock);
> + INIT_LIST_HEAD(&cru->buf_list);
> +
> + spin_lock_init(&cru->qlock);
> +
> + cru->state = RZG2L_CRU_DMA_STOPPED;
> +
> + for (i = 0; i < HW_BUFFER_MAX; i++)
> + cru->queue_buf[i] = NULL;
> +
> + /* buffer queue */
> + q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> + q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
> + q->lock = &cru->lock;
> + q->drv_priv = cru;
> + q->buf_struct_size = sizeof(struct rzg2l_cru_buffer);
> + q->ops = &rzg2l_cru_qops;
> + q->mem_ops = &vb2_dma_contig_memops;
> + q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
> + q->min_buffers_needed = 4;
> + q->dev = cru->dev;
> +
> + ret = vb2_queue_init(q);
> + if (ret < 0) {
> + dev_err(cru->dev, "failed to initialize VB2 queue\n");
> + goto error;
> + }
> +
> + /* IRQ */
> + ret = devm_request_irq(cru->dev, irq, rzg2l_cru_irq, IRQF_SHARED,
> + KBUILD_MODNAME, cru);
> + if (ret) {
> + dev_err(cru->dev, "failed to request irq\n");
> + goto error;
> + }
> +
> + return 0;
> +
> +error:
> + rzg2l_cru_dma_unregister(cru);
> + return ret;
> +}
> diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c
> new file mode 100644
> index 000000000000..b1b1bfda7eb1
> --- /dev/null
> +++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-v4l2.c
> @@ -0,0 +1,360 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Driver for Renesas RZ/G2L CRU
> + *
> + * Copyright (C) 2022 Renesas Electronics Corp.
> + *
> + * Based on Renesas R-Car VIN
> + * Copyright (C) 2016 Renesas Electronics Corp.
> + * Copyright (C) 2011-2013 Renesas Solutions Corp.
> + * Copyright (C) 2013 Cogent Embedded, Inc., <source@cogentembedded.com>
> + * Copyright (C) 2008 Magnus Damm
> + */
> +
> +#include <linux/pm_runtime.h>
> +
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-mc.h>
> +#include <media/v4l2-rect.h>
> +
> +#include "rzg2l-cru.h"
> +
> +#define RZG2L_CRU_DEFAULT_FORMAT V4L2_PIX_FMT_UYVY
> +#define RZG2L_CRU_DEFAULT_WIDTH 800
> +#define RZG2L_CRU_DEFAULT_HEIGHT 600
> +#define RZG2L_CRU_DEFAULT_FIELD V4L2_FIELD_NONE
> +#define RZG2L_CRU_DEFAULT_COLORSPACE V4L2_COLORSPACE_SRGB
> +
> +/* -----------------------------------------------------------------------------
> + * Format Conversions
> + */
> +
> +static const struct v4l2_format_info rzg2l_cru_formats[] = {
> + {
> + .format = V4L2_PIX_FMT_UYVY,
> + .bpp[0] = 2,
> + },
> +};
> +
> +const struct v4l2_format_info *rzg2l_cru_format_from_pixel(u32 format)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(rzg2l_cru_formats); i++)
> + if (rzg2l_cru_formats[i].format == format)
> + return rzg2l_cru_formats + i;
> +
> + return NULL;
> +}
> +
> +static u32 rzg2l_cru_format_bytesperline(struct v4l2_pix_format *pix)
> +{
> + const struct v4l2_format_info *fmt;
> +
> + fmt = rzg2l_cru_format_from_pixel(pix->pixelformat);
> +
> + if (WARN_ON(!fmt))
> + return -EINVAL;
> +
> + return pix->width * fmt->bpp[0];
> +}
> +
> +static u32 rzg2l_cru_format_sizeimage(struct v4l2_pix_format *pix)
> +{
> + return pix->bytesperline * pix->height;
> +}
> +
> +static void rzg2l_cru_format_align(struct rzg2l_cru_dev *cru,
> + struct v4l2_pix_format *pix)
> +{
> + if (!rzg2l_cru_format_from_pixel(pix->pixelformat))
> + pix->pixelformat = RZG2L_CRU_DEFAULT_FORMAT;
> +
> + switch (pix->field) {
> + case V4L2_FIELD_TOP:
> + case V4L2_FIELD_BOTTOM:
> + case V4L2_FIELD_NONE:
> + case V4L2_FIELD_INTERLACED_TB:
> + case V4L2_FIELD_INTERLACED_BT:
> + case V4L2_FIELD_INTERLACED:
> + break;
> + default:
> + pix->field = RZG2L_CRU_DEFAULT_FIELD;
> + break;
> + }
> +
> + /* Limit to CRU capabilities */
> + v4l_bound_align_image(&pix->width, 320, cru->info->max_width, 1,
> + &pix->height, 240, cru->info->max_height, 2, 0);
> +
> + pix->bytesperline = rzg2l_cru_format_bytesperline(pix);
> + pix->sizeimage = rzg2l_cru_format_sizeimage(pix);
> +
> + dev_dbg(cru->dev, "Format %ux%u bpl: %u size: %u\n",
> + pix->width, pix->height, pix->bytesperline, pix->sizeimage);
> +}
> +
> +static void rzg2l_cru_try_format(struct rzg2l_cru_dev *cru,
> + struct v4l2_pix_format *pix)
> +{
> + /*
> + * The V4L2 specification clearly documents the colorspace fields
> + * as being set by drivers for capture devices. Using the values
> + * supplied by userspace thus wouldn't comply with the API. Until
> + * the API is updated force fixed values.
> + */
> + pix->colorspace = RZG2L_CRU_DEFAULT_COLORSPACE;
> + pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace);
> + pix->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace);
> + pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true, pix->colorspace,
> + pix->ycbcr_enc);
> +
> + rzg2l_cru_format_align(cru, pix);
> +}
> +
> +static int rzg2l_cru_querycap(struct file *file, void *priv,
> + struct v4l2_capability *cap)
> +{
> + struct rzg2l_cru_dev *cru = video_drvdata(file);
> +
> + strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
> + strscpy(cap->card, "RZG2L_CRU", sizeof(cap->card));
> + snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
> + dev_name(cru->dev));
> + return 0;
> +}
> +
> +static int rzg2l_cru_try_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rzg2l_cru_dev *cru = video_drvdata(file);
> +
> + rzg2l_cru_try_format(cru, &f->fmt.pix);
> +
> + return 0;
> +}
> +
> +static int rzg2l_cru_s_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rzg2l_cru_dev *cru = video_drvdata(file);
> +
> + if (vb2_is_busy(&cru->queue))
> + return -EBUSY;
> +
> + rzg2l_cru_try_format(cru, &f->fmt.pix);
> +
> + cru->format = f->fmt.pix;
> +
> + cru->compose.top = 0;
> + cru->compose.left = 0;
> + cru->compose.width = cru->format.width;
> + cru->compose.height = cru->format.height;
> +
> + return 0;
> +}
> +
> +static int rzg2l_cru_g_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_format *f)
> +{
> + struct rzg2l_cru_dev *cru = video_drvdata(file);
> +
> + f->fmt.pix = cru->format;
> +
> + return 0;
> +}
> +
> +static int rzg2l_cru_enum_fmt_vid_cap(struct file *file, void *priv,
> + struct v4l2_fmtdesc *f)
> +{
> + if (f->index >= ARRAY_SIZE(rzg2l_cru_formats))
> + return -EINVAL;
> +
> + f->pixelformat = rzg2l_cru_formats[f->index].format;
> +
> + return 0;
> +}
> +
> +static int rzg2l_cru_subscribe_event(struct v4l2_fh *fh,
> + const struct v4l2_event_subscription *sub)
> +{
> + switch (sub->type) {
> + case V4L2_EVENT_SOURCE_CHANGE:
> + return v4l2_event_subscribe(fh, sub, 4, NULL);
> + }
> + return v4l2_ctrl_subscribe_event(fh, sub);
> +}
> +
> +static const struct v4l2_ioctl_ops rzg2l_cru_ioctl_ops = {
> + .vidioc_querycap = rzg2l_cru_querycap,
> + .vidioc_try_fmt_vid_cap = rzg2l_cru_try_fmt_vid_cap,
> + .vidioc_g_fmt_vid_cap = rzg2l_cru_g_fmt_vid_cap,
> + .vidioc_s_fmt_vid_cap = rzg2l_cru_s_fmt_vid_cap,
> + .vidioc_enum_fmt_vid_cap = rzg2l_cru_enum_fmt_vid_cap,
> +
> + .vidioc_reqbufs = vb2_ioctl_reqbufs,
> + .vidioc_create_bufs = vb2_ioctl_create_bufs,
> + .vidioc_querybuf = vb2_ioctl_querybuf,
> + .vidioc_qbuf = vb2_ioctl_qbuf,
> + .vidioc_dqbuf = vb2_ioctl_dqbuf,
> + .vidioc_expbuf = vb2_ioctl_expbuf,
> + .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
> + .vidioc_streamon = vb2_ioctl_streamon,
> + .vidioc_streamoff = vb2_ioctl_streamoff,
> +
> + .vidioc_log_status = v4l2_ctrl_log_status,
> + .vidioc_subscribe_event = rzg2l_cru_subscribe_event,
> + .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * Media controller file operations
> + */
> +
> +static int rzg2l_cru_open(struct file *file)
> +{
> + struct rzg2l_cru_dev *cru = video_drvdata(file);
> + int ret;
> +
> + ret = pm_runtime_resume_and_get(cru->dev);
> + if (ret < 0)
> + return ret;
> +
> + ret = mutex_lock_interruptible(&cru->lock);
> + if (ret)
> + goto err_pm;
> +
> + file->private_data = cru;
> + ret = v4l2_fh_open(file);
> + if (ret)
> + goto err_unlock;
> +
> + ret = v4l2_pipeline_pm_get(&cru->vdev.entity);
> + if (ret < 0)
> + goto err_open;
> +
> + ret = v4l2_ctrl_handler_setup(&cru->ctrl_handler);
> + if (ret)
> + goto err_power;
> +
> + mutex_unlock(&cru->lock);
> +
> + return 0;
> +err_power:
> + v4l2_pipeline_pm_put(&cru->vdev.entity);
> +err_open:
> + v4l2_fh_release(file);
> +err_unlock:
> + mutex_unlock(&cru->lock);
> +err_pm:
> + pm_runtime_put(cru->dev);
> +
> + return ret;
> +}
> +
> +static int rzg2l_cru_release(struct file *file)
> +{
> + struct rzg2l_cru_dev *cru = video_drvdata(file);
> + int ret;
> +
> + mutex_lock(&cru->lock);
> +
> + /* the release helper will cleanup any on-going streaming. */
> + ret = _vb2_fop_release(file, NULL);
> +
> + v4l2_pipeline_pm_put(&cru->vdev.entity);
> + pm_runtime_put(cru->dev);
> +
> + mutex_unlock(&cru->lock);
> +
> + return ret;
> +}
> +
> +static const struct v4l2_file_operations rzg2l_cru_fops = {
> + .owner = THIS_MODULE,
> + .unlocked_ioctl = video_ioctl2,
> + .open = rzg2l_cru_open,
> + .release = rzg2l_cru_release,
> + .poll = vb2_fop_poll,
> + .mmap = vb2_fop_mmap,
> + .read = vb2_fop_read,
> +};
> +
> +void rzg2l_cru_v4l2_unregister(struct rzg2l_cru_dev *cru)
> +{
> + if (!video_is_registered(&cru->vdev))
> + return;
> +
> + v4l2_info(&cru->v4l2_dev, "Removed %s\n",
> + video_device_node_name(&cru->vdev));
> +
> + /* Checks internally if vdev have been init or not */
> + video_unregister_device(&cru->vdev);
> +}
> +
> +static void rzg2l_cru_notify(struct v4l2_subdev *sd,
> + unsigned int notification, void *arg)
> +{
> + struct rzg2l_cru_dev *cru =
> + container_of(sd->v4l2_dev, struct rzg2l_cru_dev, v4l2_dev);
> + struct v4l2_subdev *remote;
> + struct media_pad *pad;
> +
> + pad = media_entity_remote_pad(&cru->pad);
> + if (!pad)
> + return;
> +
> + remote = media_entity_to_v4l2_subdev(pad->entity);
> + if (remote != sd)
> + return;
> +
> + switch (notification) {
> + case V4L2_DEVICE_NOTIFY_EVENT:
> + v4l2_event_queue(&cru->vdev, arg);
> + break;
> + }
> +}
> +
> +int rzg2l_cru_v4l2_register(struct rzg2l_cru_dev *cru)
> +{
> + struct video_device *vdev = &cru->vdev;
> + int ret;
> +
> + cru->v4l2_dev.notify = rzg2l_cru_notify;
> +
> + /* video node */
> + vdev->v4l2_dev = &cru->v4l2_dev;
> + vdev->queue = &cru->queue;
> + snprintf(vdev->name, sizeof(vdev->name), "CRU output");
> + vdev->release = video_device_release_empty;
> + vdev->lock = &cru->lock;
> + vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
> + V4L2_CAP_READWRITE;
> +
> + /* Set a default format */
> + cru->format.pixelformat = RZG2L_CRU_DEFAULT_FORMAT;
> + cru->format.width = RZG2L_CRU_DEFAULT_WIDTH;
> + cru->format.height = RZG2L_CRU_DEFAULT_HEIGHT;
> + cru->format.field = RZG2L_CRU_DEFAULT_FIELD;
> + cru->format.colorspace = RZG2L_CRU_DEFAULT_COLORSPACE;
> +
> + vdev->device_caps |= V4L2_CAP_IO_MC;
> + vdev->fops = &rzg2l_cru_fops;
> + vdev->ioctl_ops = &rzg2l_cru_ioctl_ops;
> +
> + rzg2l_cru_format_align(cru, &cru->format);
> +
> + ret = video_register_device(&cru->vdev, VFL_TYPE_VIDEO, -1);
> + if (ret) {
> + dev_err(cru->dev, "Failed to register video device\n");
> + return ret;
> + }
> +
> + video_set_drvdata(&cru->vdev, cru);
> +
> + v4l2_info(&cru->v4l2_dev, "Device registered as %s\n",
> + video_device_node_name(&cru->vdev));
> +
> + return ret;
> +}
> --
> 2.17.1
>