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Message-ID: <7627ca50-ab5b-46bd-9711-83718e3dd269@amd.com>
Date: Tue, 2 Sep 2025 11:11:09 +0800
From: "Du, Bin" <bin.du@....com>
To: Mario Limonciello <superm1@...nel.org>, mchehab@...nel.org,
hverkuil@...all.nl, laurent.pinchart+renesas@...asonboard.com,
bryan.odonoghue@...aro.org, sakari.ailus@...ux.intel.com,
prabhakar.mahadev-lad.rj@...renesas.com, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org, sultan@...neltoast.com
Cc: pratap.nirujogi@....com, benjamin.chan@....com, king.li@....com,
gjorgji.rosikopulos@....com, Phil.Jawich@....com, Dominic.Antony@....com,
richard.gong@....com, anson.tsao@....com,
Svetoslav Stoilov <Svetoslav.Stoilov@....com>
Subject: Re: [PATCH v3 1/7] media: platform: amd: Introduce amd isp4 capture
driver
Many thanks Mario for the review.
On 8/29/2025 12:54 AM, Mario Limonciello wrote:
> On 8/28/25 5:08 AM, Du, Bin wrote:
>> AMD isp4 capture is a v4l2 media device which implements media controller
>> interface. It has one sub-device (AMD ISP4 sub-device) endpoint which can
>> be connected to a remote CSI2 TX endpoint. It supports only one physical
>> interface for now. Also add ISP4 driver related entry info into the
>> MAINTAINERS file
>>
>> Co-developed-by: Svetoslav Stoilov <Svetoslav.Stoilov@....com>
>> Signed-off-by: Svetoslav Stoilov <Svetoslav.Stoilov@....com>
>> Signed-off-by: Bin Du <Bin.Du@....com>
> Reviewed-by: Mario Limonciello (AMD) <superm1@...nel.org>> ---
>> MAINTAINERS | 13 +++
>> drivers/media/platform/Kconfig | 1 +
>> drivers/media/platform/Makefile | 1 +
>> drivers/media/platform/amd/Kconfig | 3 +
>> drivers/media/platform/amd/Makefile | 3 +
>> drivers/media/platform/amd/isp4/Kconfig | 13 +++
>> drivers/media/platform/amd/isp4/Makefile | 6 ++
>> drivers/media/platform/amd/isp4/isp4.c | 121 +++++++++++++++++++++++
>> drivers/media/platform/amd/isp4/isp4.h | 24 +++++
>> 9 files changed, 185 insertions(+)
>> create mode 100644 drivers/media/platform/amd/Kconfig
>> create mode 100644 drivers/media/platform/amd/Makefile
>> create mode 100644 drivers/media/platform/amd/isp4/Kconfig
>> create mode 100644 drivers/media/platform/amd/isp4/Makefile
>> create mode 100644 drivers/media/platform/amd/isp4/isp4.c
>> create mode 100644 drivers/media/platform/amd/isp4/isp4.h
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index fe168477caa4..3ad845f1511b 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -1133,6 +1133,19 @@ T: git git://git.kernel.org/pub/scm/linux/
>> kernel/git/iommu/linux.git
>> F: drivers/iommu/amd/
>> F: include/linux/amd-iommu.h
>> +AMD ISP4 DRIVER
>> +M: Bin Du <bin.du@....com>
>> +M: Nirujogi Pratap <pratap.nirujogi@....com>
>> +L: linux-media@...r.kernel.org
>> +S: Maintained
>> +T: git git://linuxtv.org/media.git
>> +F: drivers/media/platform/amd/Kconfig
>> +F: drivers/media/platform/amd/Makefile
>> +F: drivers/media/platform/amd/isp4/Kconfig
>> +F: drivers/media/platform/amd/isp4/Makefile
>> +F: drivers/media/platform/amd/isp4/isp4.c
>> +F: drivers/media/platform/amd/isp4/isp4.h
>> +
>> AMD KFD
>> M: Felix Kuehling <Felix.Kuehling@....com>
>> L: amd-gfx@...ts.freedesktop.org
>> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/
>> Kconfig
>> index 9287faafdce5..772c70665510 100644
>> --- a/drivers/media/platform/Kconfig
>> +++ b/drivers/media/platform/Kconfig
>> @@ -63,6 +63,7 @@ config VIDEO_MUX
>> # Platform drivers - Please keep it alphabetically sorted
>> source "drivers/media/platform/allegro-dvt/Kconfig"
>> +source "drivers/media/platform/amd/Kconfig"
>> source "drivers/media/platform/amlogic/Kconfig"
>> source "drivers/media/platform/amphion/Kconfig"
>> source "drivers/media/platform/aspeed/Kconfig"
>> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/
>> Makefile
>> index 6fd7db0541c7..b207bd8d8022 100644
>> --- a/drivers/media/platform/Makefile
>> +++ b/drivers/media/platform/Makefile
>> @@ -6,6 +6,7 @@
>> # Place here, alphabetically sorted by directory
>> # (e. g. LC_ALL=C sort Makefile)
>> obj-y += allegro-dvt/
>> +obj-y += amd/
>> obj-y += amlogic/
>> obj-y += amphion/
>> obj-y += aspeed/
>> diff --git a/drivers/media/platform/amd/Kconfig b/drivers/media/
>> platform/amd/Kconfig
>> new file mode 100644
>> index 000000000000..25af49f246b2
>> --- /dev/null
>> +++ b/drivers/media/platform/amd/Kconfig
>> @@ -0,0 +1,3 @@
>> +# SPDX-License-Identifier: GPL-2.0+
>> +
>> +source "drivers/media/platform/amd/isp4/Kconfig"
>> diff --git a/drivers/media/platform/amd/Makefile b/drivers/media/
>> platform/amd/Makefile
>> new file mode 100644
>> index 000000000000..8bfc1955f22e
>> --- /dev/null
>> +++ b/drivers/media/platform/amd/Makefile
>> @@ -0,0 +1,3 @@
>> +# SPDX-License-Identifier: GPL-2.0+
>> +
>> +obj-y += isp4/
>> diff --git a/drivers/media/platform/amd/isp4/Kconfig b/drivers/media/
>> platform/amd/isp4/Kconfig
>> new file mode 100644
>> index 000000000000..0268060c2dae
>> --- /dev/null
>> +++ b/drivers/media/platform/amd/isp4/Kconfig
>> @@ -0,0 +1,13 @@
>> +# SPDX-License-Identifier: GPL-2.0+
>> +
>> +config AMD_ISP4
>> + tristate "AMD ISP4 and camera driver"
>> + depends on VIDEO_DEV && VIDEO_V4L2_SUBDEV_API
>> + select VIDEOBUF2_CORE
>> + select VIDEOBUF2_V4L2
>> + select VIDEOBUF2_MEMOPS
>> + help
>> + This is support for AMD ISP4 and camera subsystem driver.
>> + Say Y here to enable the ISP4 and camera device for video capture.
>> + To compile this driver as a module, choose M here. The module will
>> + be called amd_capture.
>> diff --git a/drivers/media/platform/amd/isp4/Makefile b/drivers/media/
>> platform/amd/isp4/Makefile
>> new file mode 100644
>> index 000000000000..de0092dad26f
>> --- /dev/null
>> +++ b/drivers/media/platform/amd/isp4/Makefile
>> @@ -0,0 +1,6 @@
>> +# SPDX-License-Identifier: GPL-2.0+
>> +#
>> +# Copyright (C) 2025 Advanced Micro Devices, Inc.
>> +
>> +obj-$(CONFIG_AMD_ISP4) += amd_capture.o
>> +amd_capture-objs := isp4.o
>> diff --git a/drivers/media/platform/amd/isp4/isp4.c b/drivers/media/
>> platform/amd/isp4/isp4.c
>> new file mode 100644
>> index 000000000000..6ff3ded4310a
>> --- /dev/null
>> +++ b/drivers/media/platform/amd/isp4/isp4.c
>> @@ -0,0 +1,121 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Copyright (C) 2025 Advanced Micro Devices, Inc.
>> + */
>> +
>> +#include <linux/pm_runtime.h>
>> +#include <linux/vmalloc.h>
>> +#include <media/v4l2-ioctl.h>
>> +
>> +#include "isp4.h"
>> +
>> +#define VIDEO_BUF_NUM 5
>> +
>> +#define ISP4_DRV_NAME "amd_isp_capture"
>> +
>> +/* interrupt num */
>> +static const u32 isp4_ringbuf_interrupt_num[] = {
>> + 0, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT9 */
>> + 1, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT10 */
>> + 3, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT11 */
>> + 4, /* ISP_4_1__SRCID__ISP_RINGBUFFER_WPT12 */
>> +};
>> +
>> +#define to_isp4_device(dev) \
>> + ((struct isp4_device *)container_of(dev, struct isp4_device,
>> v4l2_dev))
>> +
>> +static irqreturn_t isp4_irq_handler(int irq, void *arg)
>> +{
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static int isp4_capture_probe(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct isp4_device *isp_dev;
>> + int i, irq, ret;
>> +
>> + isp_dev = devm_kzalloc(&pdev->dev, sizeof(*isp_dev), GFP_KERNEL);
>> + if (!isp_dev)
>> + return -ENOMEM;
>> +
>> + isp_dev->pdev = pdev;
>> + dev->init_name = ISP4_DRV_NAME;
>> +
>> + for (i = 0; i < ARRAY_SIZE(isp4_ringbuf_interrupt_num); i++) {
>> + irq = platform_get_irq(pdev, isp4_ringbuf_interrupt_num[i]);
>> + if (irq < 0)
>> + return dev_err_probe(dev, -ENODEV,
>> + "fail to get irq %d\n",
>> + isp4_ringbuf_interrupt_num[i]);
>> + ret = devm_request_irq(&pdev->dev, irq, isp4_irq_handler, 0,
>> + "ISP_IRQ", &pdev->dev);
>> + if (ret)
>> + return dev_err_probe(dev, ret, "fail to req irq %d\n",
>> + irq);
>> + }
>> +
>> + /* Link the media device within the v4l2_device */
>> + isp_dev->v4l2_dev.mdev = &isp_dev->mdev;
>> +
>> + /* Initialize media device */
>> + strscpy(isp_dev->mdev.model, "amd_isp41_mdev",
>> + sizeof(isp_dev->mdev.model));
>> + snprintf(isp_dev->mdev.bus_info, sizeof(isp_dev->mdev.bus_info),
>> + "platform:%s", ISP4_DRV_NAME);
>> + isp_dev->mdev.dev = &pdev->dev;
>> + media_device_init(&isp_dev->mdev);
>> +
>> + /* register v4l2 device */
>> + snprintf(isp_dev->v4l2_dev.name, sizeof(isp_dev->v4l2_dev.name),
>> + "AMD-V4L2-ROOT");
>> + ret = v4l2_device_register(&pdev->dev, &isp_dev->v4l2_dev);
>> + if (ret)
>> + return dev_err_probe(dev, ret,
>> + "fail register v4l2 device\n");
>> +
>> + ret = media_device_register(&isp_dev->mdev);
>> + if (ret) {
>> + dev_err(dev, "fail to register media device %d\n", ret);
>> + goto err_unreg_v4l2;
>> + }
>> +
>> + platform_set_drvdata(pdev, isp_dev);
>> +
>> + pm_runtime_set_suspended(dev);
>> + pm_runtime_enable(dev);
>> +
>> + return 0;
>> +
>> +err_unreg_v4l2:
>> + v4l2_device_unregister(&isp_dev->v4l2_dev);
>> +
>> + return dev_err_probe(dev, ret, "isp probe fail\n");
>> +}
>> +
>> +static void isp4_capture_remove(struct platform_device *pdev)
>> +{
>> + struct isp4_device *isp_dev = platform_get_drvdata(pdev);
>> +
>> + media_device_unregister(&isp_dev->mdev);
>> + v4l2_device_unregister(&isp_dev->v4l2_dev);
>> +}
>> +
>> +static struct platform_driver isp4_capture_drv = {
>> + .probe = isp4_capture_probe,
>> + .remove = isp4_capture_remove,
>> + .driver = {
>> + .name = ISP4_DRV_NAME,
>> + .owner = THIS_MODULE,
>> + }
>> +};
>> +
>> +module_platform_driver(isp4_capture_drv);
>> +
>> +MODULE_ALIAS("platform:" ISP4_DRV_NAME);
>> +MODULE_IMPORT_NS("DMA_BUF");
>> +
>> +MODULE_DESCRIPTION("AMD ISP4 Driver");
>> +MODULE_AUTHOR("Bin Du <bin.du@....com>");
>> +MODULE_AUTHOR("Pratap Nirujogi <pratap.nirujogi@....com>");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/media/platform/amd/isp4/isp4.h b/drivers/media/
>> platform/amd/isp4/isp4.h
>> new file mode 100644
>> index 000000000000..8535f662ab49
>> --- /dev/null
>> +++ b/drivers/media/platform/amd/isp4/isp4.h
>> @@ -0,0 +1,24 @@
>> +/* SPDX-License-Identifier: GPL-2.0+ */
>> +/*
>> + * Copyright (C) 2025 Advanced Micro Devices, Inc.
>> + */
>> +
>> +#ifndef _ISP4_H_
>> +#define _ISP4_H_
>> +
>> +#include <linux/mutex.h>
>> +#include <media/v4l2-device.h>
>> +#include <media/videobuf2-memops.h>
>> +#include <media/videobuf2-vmalloc.h>
>> +
>> +#define ISP4_GET_ISP_REG_BASE(isp4sd) (((isp4sd))->mmio)
>> +
>> +struct isp4_device {
>> + struct v4l2_device v4l2_dev;
>> + struct media_device mdev;
>> +
>> + struct platform_device *pdev;
>> + struct notifier_block i2c_nb;
>> +};
>> +
>> +#endif /* _ISP4_H_ */
>
--
Regards,
Bin
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