linux-kernel - Re: [PATCH 1/1] usb: cdns3: skip set TRB_IOC when usb_request: no

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Date:   Tue, 31 Oct 2023 16:45:21 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Frank Li <Frank.Li@....com>
Cc:     imx@...ts.linux.dev, 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>
Subject: Re: [PATCH 1/1] usb: cdns3: skip set TRB_IOC when usb_request:
 no_interrupt is true

On 23-10-27 14:39:19, Frank Li wrote:
> No completion irq is needed if no_interrupt is true. Needn't set TRB_IOC
> at this case.
> 
> Check usb_request: no_interrupt and set/skip TRB_IOC in
> cdns3_ep_run_transfer().
> 
> Signed-off-by: Frank Li <Frank.Li@....com>

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

Peter
> ---
>  drivers/usb/cdns3/cdns3-gadget.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 69a44bd7e5d02..cd08897f8da8b 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -1124,6 +1124,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
>  	u16 total_tdl = 0;
>  	struct scatterlist *s = NULL;
>  	bool sg_supported = !!(request->num_mapped_sgs);
> +	u32 ioc = request->no_interrupt ? 0 : TRB_IOC;
>  
>  	if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
>  		num_trb = priv_ep->interval;
> @@ -1233,11 +1234,11 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
>  			control |= pcs;
>  
>  		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir) {
> -			control |= TRB_IOC | TRB_ISP;
> +			control |= ioc | TRB_ISP;
>  		} else {
>  			/* for last element in TD or in SG list */
>  			if (sg_iter == (num_trb - 1) && sg_iter != 0)
> -				control |= pcs | TRB_IOC | TRB_ISP;
> +				control |= pcs | ioc | TRB_ISP;
>  		}
>  
>  		if (sg_iter)
> @@ -1268,7 +1269,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
>  	priv_req->num_of_trb = num_trb;
>  
>  	if (sg_iter == 1)
> -		trb->control |= cpu_to_le32(TRB_IOC | TRB_ISP);
> +		trb->control |= cpu_to_le32(ioc | TRB_ISP);
>  
>  	if (priv_dev->dev_ver < DEV_VER_V2 &&
>  	    (priv_ep->flags & EP_TDLCHK_EN)) {
> -- 
> 2.34.1
> 

-- 

Thanks,
Peter Chen