linux-kernel - Re: [PATCH 2/2] usb: cdns3: optimize OUT transfer by copying only actual received data

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Date:   Mon, 5 Jun 2023 07:03:01 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     Pawel Laszczak <pawell@...ence.com>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:CADENCE USB3 DRD IP DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, imx@...ts.linux.dev
Subject: Re: [PATCH 2/2] usb: cdns3: optimize OUT transfer by copying only
 actual received data

On 23-05-18 16:49:46, Frank Li wrote:
> Previously, the entire length of the request, which is equal to or greater
> than the actual data, was dma synced and memcpy when using the bounce
> buffer. Actually only the actual data indicated by request->actual need be
> synced and copied.
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/usb/cdns3/cdns3-gadget.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 09a0882a4e97..ea19253fd2d0 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -809,10 +809,10 @@ void cdns3_gadget_giveback(struct cdns3_endpoint *priv_ep,
>  		/* Make DMA buffer CPU accessible */
>  		dma_sync_single_for_cpu(priv_dev->sysdev,
>  			priv_req->aligned_buf->dma,
> -			priv_req->aligned_buf->size,
> +			request->actual,
>  			priv_req->aligned_buf->dir);
>  		memcpy(request->buf, priv_req->aligned_buf->buf,
> -		       request->length);
> +		       request->actual);
>  	}

Acked-by: Peter Chen <peter.chen@...nel.org>

>  
>  	priv_req->flags &= ~(REQUEST_PENDING | REQUEST_UNALIGNED);
> -- 
> 2.34.1
> 

-- 

Thanks,
Peter Chen