linux-kernel - Re: [PATCH v2] usb: dwc3: set the dma max_seg

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Message-ID: <20231031232227.xkk4ju3hxifj3vee@synopsys.com>
Date:   Tue, 31 Oct 2023 23:22:35 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
CC:     Zubin Mithra <zsm@...omium.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] usb: dwc3: set the dma max_seg_size

On Fri, Oct 27, 2023, Ricardo Ribalda wrote:
> Allow devices to have dma operations beyond 4K, and avoid warnings such
> as:
> 
> DMA-API: dwc3 a600000.usb: mapping sg segment longer than device claims to support [len=86016] [max=65536]
> 
> Cc: stable@...r.kernel.org
> Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
> Reported-by: Zubin Mithra <zsm@...omium.org>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
> Found while running 
> yavta -f YUYV -s 1280x720 -c  /dev/video0
> 
> with:
> 
> CONFIG_DMA_API_DEBUG=y
> ---
> Changes in v2:
> - Add stable tag
> - Link to v1: https://urldefense.com/v3/__https://lore.kernel.org/r/20231026-dwc3-v1-1-643c74771599@chromium.org__;!!A4F2R9G_pg!b22b7Wx1QOpnFtMi7rJ0TS-rhOnMmy_sOCX3kdfln7ezNjslyMhBwHvWaXbK8D5BkKPjjn3HdID-7Ls5R3eR_4o$ 
> ---
>  drivers/usb/dwc3/core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 343d2570189f..65f73dd8ef47 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1918,6 +1918,8 @@ static int dwc3_probe(struct platform_device *pdev)
>  
>  	pm_runtime_put(dev);
>  
> +	dma_set_max_seg_size(dev, UINT_MAX);
> +
>  	return 0;
>  
>  err_exit_debugfs:
> 
> ---
> base-commit: 611da07b89fdd53f140d7b33013f255bf0ed8f34
> change-id: 20231026-dwc3-fac74fcb3b2a
> 
> Best regards,
> -- 
> Ricardo Ribalda <ribalda@...omium.org>
> 

Probably better to have the Closes: tag with the link to the reported
issue. Regardless,

Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

Thanks,
Thinh