linux-kernel - Re: [PATCH v3 5/7] media: platform: amd: isp4 video node and buffers handling added

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Message-ID: <da070ae7-6347-4ce5-a0c1-11d1b0e491bf@amd.com>
Date: Fri, 5 Sep 2025 15:05:29 +0800
From: "Du, Bin" <bin.du@....com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: mchehab@...nel.org, hverkuil@...all.nl, 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, 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
Subject: Re: [PATCH v3 5/7] media: platform: amd: isp4 video node and buffers
 handling added

Thanks Laurent Pinchart,

On 9/3/2025 6:08 PM, Laurent Pinchart wrote:
> Hi Bin,
> 
> Thank you for the patch.
> 
> On Thu, Aug 28, 2025 at 06:08:09PM +0800, Bin Du wrote:
>> Isp video implements v4l2 video interface and supports NV12 and YUYV. It
>> manages buffers, pipeline power and state. Cherry-picked Sultan's DMA
>> buffer realated fix from branch v6.16-drm-tip-isp4-for-amd on
>> https://github.com/kerneltoast/kernel_x86_laptop.git
>>
>> Co-developed-by: Sultan Alsawaf <sultan@...neltoast.com>
>> Signed-off-by: Sultan Alsawaf <sultan@...neltoast.com>
>> Co-developed-by: Svetoslav Stoilov <Svetoslav.Stoilov@....com>
>> Signed-off-by: Svetoslav Stoilov <Svetoslav.Stoilov@....com>
>> Signed-off-by: Bin Du <Bin.Du@....com>
>> ---
>>   MAINTAINERS                                   |    2 +
>>   drivers/media/platform/amd/isp4/Makefile      |    1 +
>>   drivers/media/platform/amd/isp4/isp4.c        |   10 +
>>   drivers/media/platform/amd/isp4/isp4_subdev.c |   95 +-
>>   drivers/media/platform/amd/isp4/isp4_subdev.h |    2 +
>>   drivers/media/platform/amd/isp4/isp4_video.c  | 1213 +++++++++++++++++
>>   drivers/media/platform/amd/isp4/isp4_video.h  |   87 ++
>>   7 files changed, 1406 insertions(+), 4 deletions(-)
>>   create mode 100644 drivers/media/platform/amd/isp4/isp4_video.c
>>   create mode 100644 drivers/media/platform/amd/isp4/isp4_video.h
> 
> [snip]
> 
>> diff --git a/drivers/media/platform/amd/isp4/isp4_video.c b/drivers/media/platform/amd/isp4/isp4_video.c
>> new file mode 100644
>> index 000000000000..642faff83287
>> --- /dev/null
>> +++ b/drivers/media/platform/amd/isp4/isp4_video.c
> 
> [snip]
> 
>> +static int isp4vid_ioctl_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
>> +{
>> +	struct isp4vid_dev *isp_vdev = video_drvdata(file);
>> +
>> +	strscpy(cap->driver, ISP4VID_ISP_DRV_NAME, sizeof(cap->driver));
>> +	snprintf(cap->card, sizeof(cap->card), "%s", ISP4VID_ISP_DRV_NAME);
>> +	snprintf(cap->bus_info, sizeof(cap->bus_info),
>> +		 "platform:%s", ISP4VID_ISP_DRV_NAME);
> 
> The bus_info is set by v4l_quercap, I think you can drop it here (please
> double-check the result).
> 

Yes, you are definitely correct. bus_info is set by media_set_bus_info 
call in v4l_querycap. Will drop it in the next version.

>> +
>> +	cap->capabilities |= (V4L2_CAP_STREAMING |
>> +			      V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_IO_MC);
> 
> You can now drop V4L2_CAP_IO_MC (and there's no need for parentheses).
> 

Sure, will update in the next version.

>> +
>> +	dev_dbg(isp_vdev->dev, "%s|capabilities=0x%X",
>> +		isp_vdev->vdev.name, cap->capabilities);
>> +
>> +	return 0;
>> +}
> 
> [snip]
> 

-- 
Regards,
Bin