linux-kernel - RE: [PATCH 1/2] usb: musb: Ensure rx reinit occurs for shared

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Date:	Fri, 20 May 2016 17:01:14 +0000
From:	Andrew Goodbody <andrew.goodbody@...brionix.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"b-liu@...com" <b-liu@...com>
CC:	"gregkh@...uxfoundation.org" <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 1/2] usb: musb: Ensure rx reinit occurs for shared_fifo
 endpoints

> From: Sergei Shtylyov [mailto:sergei.shtylyov@...entembedded.com]
> 
> Hello.
> 
> On 05/20/2016 05:51 PM, Andrew Goodbody wrote:
> 
> > shared_fifo endpoints would only get a previous tx state cleared out,
> > the rx state was only cleared for non shared_fifo endpoints Change
> > this so that the rx state is cleared for all endpoints.
> > This addresses an issue that resulted in rx packets being dropped
> > silently.
> >
> > Signed-off-by: Andrew Goodbody <andrew.goodbody@...brionix.com>
> > Cc: stable@...r.kernel.org
> > ---
> >  drivers/usb/musb/musb_host.c | 15 ++++++++-------
> >  1 file changed, 8 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/usb/musb/musb_host.c
> > b/drivers/usb/musb/musb_host.c index 2f8ad7f..30e0d65 100644
> > --- a/drivers/usb/musb/musb_host.c
> > +++ b/drivers/usb/musb/musb_host.c
> > @@ -594,14 +594,15 @@ musb_rx_reinit(struct musb *musb, struct
> musb_qh *qh, u8 epnum)
> >  		musb_writew(ep->regs, MUSB_TXCSR, 0);
> >
> >  	/* scrub all previous state, clearing toggle */
> > -	} else {
> > -		csr = musb_readw(ep->regs, MUSB_RXCSR);
> > -		if (csr & MUSB_RXCSR_RXPKTRDY)
> > -			WARNING("rx%d, packet/%d ready?\n", ep-
> >epnum,
> > -				musb_readw(ep->regs, MUSB_RXCOUNT));
> > -
> > -		musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
> >  	}
> > +	csr = musb_readw(ep->regs, MUSB_RXCSR);
> > +	if (csr & MUSB_RXCSR_RXPKTRDY) {
> > +		WARNING("rx%d, packet/%d ready?\n", ep->epnum,
> > +			musb_readw(ep->regs, MUSB_RXCOUNT));
> > +		urb_qh_dump(musb);
> 
>     I'm not seeing this function anywhere... debugging leftover?

Sorry, yes, my bad. I'll remove it for v2.

Andrew

> > +	}
> > +
> > +	musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
> >
> >  	/* target addr and (for multipoint) hub addr/port */
> >  	if (musb->is_multipoint) {
> 
> MBR, Sergei