linux-kernel - Re: [PATCH v2 3/4] usb: musb: Extract set toggle as a separate interface

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Date:   Tue, 15 Jan 2019 14:40:49 -0600
From:   Bin Liu <b-liu@...com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     <min.guo@...iatek.com>, Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        <chunfeng.yun@...iatek.com>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 3/4] usb: musb: Extract set toggle as a separate
 interface

Hi Min,

On Tue, Jan 15, 2019 at 04:19:42PM +0100, Matthias Brugger wrote:
> 
> 
> On 15/01/2019 02:43, min.guo@...iatek.com wrote:
> > From: Min Guo <min.guo@...iatek.com>
> > 
> > Add a common interface for set data toggle
> > 
> > Signed-off-by: Min Guo <min.guo@...iatek.com>
> > ---
> >  drivers/usb/musb/musb_host.c | 37 +++++++++++++++++++++++--------------
> >  1 file changed, 23 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
> > index b59ce9a..16d0ba4 100644
> > --- a/drivers/usb/musb/musb_host.c
> > +++ b/drivers/usb/musb/musb_host.c
> > @@ -306,6 +306,25 @@ static inline void musb_save_toggle(struct musb_qh *qh, int is_in,
> >  	usb_settoggle(urb->dev, qh->epnum, !is_in, csr ? 1 : 0);
> >  }
> >  
> > +static inline u16 musb_set_toggle(struct musb_qh *qh, int is_in,
> > +	struct urb *urb)
> > +{
> > +	u16 csr = 0;
> > +	u16 toggle = 0;
> > +
> > +	toggle = usb_gettoggle(urb->dev, qh->epnum, !is_in);
> > +
> > +	if (is_in)
> > +		csr = toggle ? (MUSB_RXCSR_H_WR_DATATOGGLE
> > +				| MUSB_RXCSR_H_DATATOGGLE) : 0;
> > +	else
> > +		csr = toggle ? (MUSB_TXCSR_H_WR_DATATOGGLE
> > +				| MUSB_TXCSR_H_DATATOGGLE)
> > +				: MUSB_TXCSR_CLRDATATOG;
> 
> Can we switch the if and use is_out logic as function parameter. This would make
> the code easier to understand.

based on the current implementation in patch 4/4, I don't think we need
this separate patch any more, but Matthias' comments still apply.

Regards,
-Bin.