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Message-ID: <f053331d-1be2-4d51-a99e-7d69f7bb26d3@amd.com>
Date: Tue, 23 Sep 2025 15:56:41 +0800
From: "Du, Bin" <bin.du@....com>
To: Sultan Alsawaf <sultan@...neltoast.com>
Cc: 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,
pratap.nirujogi@....com, benjamin.chan@....com, king.li@....com,
gjorgji.rosikopulos@....com, Phil.Jawich@....com, Dominic.Antony@....com,
mario.limonciello@....com, richard.gong@....com, anson.tsao@....com,
Svetoslav Stoilov <Svetoslav.Stoilov@....com>,
Mario Limonciello <superm1@...nel.org>,
Alexey Zagorodnikov <xglooom@...il.com>
Subject: Re: [PATCH v4 1/7] media: platform: amd: Introduce amd isp4 capture
driver
Many thanks Sultan for your careful review.
On 9/22/2025 4:23 AM, Sultan Alsawaf wrote:
> Hi Bin,
>
> On Thu, Sep 11, 2025 at 06:08:41PM +0800, Bin Du 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>
>> Tested-by: Alexey Zagorodnikov <xglooom@...il.com>
>
> [snip]
>
>> +++ 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 && DRM_AMD_ISP
>> + select VIDEOBUF2_CORE
>> + select VIDEOBUF2_V4L2
>> + select VIDEOBUF2_MEMOPS
>
> VIDEO_V4L2_SUBDEV_API should be selected rather than set as a dependency, per
> what other drivers do. You can also sort the dependencies to look cleaner.
>
> Change to:
>
> depends on VIDEO_DEV && DRM_AMD_ISP
> select VIDEOBUF2_CORE
> select VIDEOBUF2_MEMOPS
> select VIDEOBUF2_V4L2
> select VIDEO_V4L2_SUBDEV_API
>
Sure, will change VIDEO_V4L2_SUBDEV_API from depends to select. Had a
check, yes, you are correct, almost all driver are doing like this with
only one exception drivers/media/platform/ti/Kconfig
>> + 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.
>
> [snip]
>
>> +++ 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))
>
> The unnecessary cast on container_of() is removed later in "[PATCH v4 4/7]
> media: platform: amd: isp4 subdev and firmware loading handling added".
>
> Remove the cast in this patch instead.
>
Sure, will remove it directly from this patch
>> +
>> +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);
>
> s/&pdev->dev/dev/
>
Sure, will update in the next version.
>> + 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]);
>
> Return the error from platform_get_irq() here instead of -ENODEV.
>
Thanks, will update in the next version.
>> + ret = devm_request_irq(&pdev->dev, irq, isp4_irq_handler, 0,
>> + "ISP_IRQ", &pdev->dev);
>
> s/&pdev->dev/dev/
>
Sure, will update in the next version.
>> + 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;
>
> s/&pdev->dev/dev/
>
Sure, will update in the next version.
>> + 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);
>
> s/&pdev->dev/dev/
>
Sure, will update in the next version.
>> + 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");
>> +}
>
> [snip]
>
>> +++ 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>
>
> Remove this linux/mutex.h include. It should be moved to isp4_subdev.h instead.
>
Sure, will update in the next version.
>> +#include <media/v4l2-device.h>
>> +#include <media/videobuf2-memops.h>
>> +#include <media/videobuf2-vmalloc.h>
>
> This media/videobuf2-vmalloc.h include is removed in "[PATCH v4 4/7] media:
> platform: amd: isp4 subdev and firmware loading handling added".
>
> Remove it in this patch instead.
>
Sure, will remove it directly from this patch.
>> +
>> +#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;
>
> i2c_nb is unused, remove it.
>
Sure, will remove it and other unused fields in this struct.
>> +};
>> +
>> +#endif /* _ISP4_H_ */
>> --
>> 2.34.1
>>
>
> Sultan
--
Regards,
Bin
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