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

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Message-ID: <20210527012313.GA20398@nchen>
Date:   Thu, 27 May 2021 09:23:13 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Aswath Govindraju <a-govindraju@...com>
Cc:     Sanket Parmar <sparmar@...ence.com>, pawell@...ence.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 21-05-26 20:30:37, Aswath Govindraju wrote:
> Hi Peter,
> 
> On 17/05/21 8:35 pm, 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>
> > ---
> 
> May I know if this patch will be picked up as a bug fix for -rc.

Yes, it has already at my fixes tree, to make sure no one report issues,
I will send to Greg after several days later.

Peter
> 
> Thanks,
> Aswath
> 
> >  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:
> > 
> 

-- 

Thanks,
Peter Chen