linux-kernel - Re: [PATCH] usb: cdns3: Enable TDL

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Date:   Sat, 22 May 2021 18:09:13 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Sanket Parmar <sparmar@...ence.com>, pawell@...ence.com
Cc:     a-govindraju@...com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, kurahul@...ence.com,
        gregkh@...uxfoundation.org, kishon@...com
Subject: Re: [PATCH] usb: cdns3: Enable TDL_CHK only for OUT ep

On 21-05-17 17:05:12, Sanket Parmar wrote:
> ZLP gets stuck if TDL_CHK bit is set and TDL_FROM_TRB is used
> as TDL source for IN endpoints. To fix it, TDL_CHK is only
> enabled for OUT endpoints.
> 
> Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
> Reported-by: Aswath Govindraju <a-govindraju@...com>
> Signed-off-by: Sanket Parmar <sparmar@...ence.com>
> ---
>  drivers/usb/cdns3/cdns3-gadget.c |    8 +++-----
>  1 files changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 105855a..f3c0276 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -2007,7 +2007,7 @@ static void cdns3_configure_dmult(struct cdns3_device *priv_dev,
>  		else
>  			mask = BIT(priv_ep->num);
>  
> -		if (priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
> +		if (priv_ep->type != USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir) {
>  			cdns3_set_register_bit(&regs->tdl_from_trb, mask);
>  			cdns3_set_register_bit(&regs->tdl_beh, mask);
>  			cdns3_set_register_bit(&regs->tdl_beh2, mask);
> @@ -2046,15 +2046,13 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
>  	case USB_ENDPOINT_XFER_INT:
>  		ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_INT);
>  
> -		if ((priv_dev->dev_ver == DEV_VER_V2 && !priv_ep->dir) ||
> -		    priv_dev->dev_ver > DEV_VER_V2)
> +		if (priv_dev->dev_ver >= DEV_VER_V2 && !priv_ep->dir)
>  			ep_cfg |= EP_CFG_TDL_CHK;
>  		break;
>  	case USB_ENDPOINT_XFER_BULK:
>  		ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_BULK);
>  
> -		if ((priv_dev->dev_ver == DEV_VER_V2  && !priv_ep->dir) ||
> -		    priv_dev->dev_ver > DEV_VER_V2)
> +		if (priv_dev->dev_ver >= DEV_VER_V2 && !priv_ep->dir)
>  			ep_cfg |= EP_CFG_TDL_CHK;
>  		break;
>  	default:
> -- 

Sanket & Pawel, please confirm this behaviour could apply for DEV_VER_V3,
that is TDL_CHK can't be used for bulk in for DEV_VER_V3?

-- 

Thanks,
Peter Chen