linux-kernel - Re: [PATCH 10/10] usb: udc: net2280: convert to readl_poll_timeout

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Date:   Thu, 20 Aug 2020 09:57:03 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Alan Stern <stern@...land.harvard.edu>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <balbi@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 10/10] usb: udc: net2280: convert to
 readl_poll_timeout_atomic()

On Wed, 2020-08-19 at 10:59 -0400, Alan Stern wrote:
> On Wed, Aug 19, 2020 at 08:41:05PM +0800, Chunfeng Yun wrote:
> > Use readl_poll_timeout_atomic() to simplify code
> > 
> > Cc: Alan Stern <stern@...land.harvard.edu>
> > Cc: Felipe Balbi <balbi@...nel.org>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >  drivers/usb/gadget/udc/net2280.c | 21 ++++++++++-----------
> >  1 file changed, 10 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
> > index 7530bd9..f1a21f4 100644
> > --- a/drivers/usb/gadget/udc/net2280.c
> > +++ b/drivers/usb/gadget/udc/net2280.c
> > @@ -52,6 +52,7 @@
> >  #include <linux/usb/gadget.h>
> >  #include <linux/prefetch.h>
> >  #include <linux/io.h>
> > +#include <linux/iopoll.h>
> >  
> >  #include <asm/byteorder.h>
> >  #include <asm/irq.h>
> > @@ -360,18 +361,16 @@ static inline void enable_pciirqenb(struct net2280_ep *ep)
> >  static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
> >  {
> >  	u32	result;
> > +	int	ret;
> >  
> > -	do {
> > -		result = readl(ptr);
> > -		if (result == ~(u32)0)		/* "device unplugged" */
> > -			return -ENODEV;
> > -		result &= mask;
> > -		if (result == done)
> > -			return 0;
> > -		udelay(1);
> > -		usec--;
> > -	} while (usec > 0);
> > -	return -ETIMEDOUT;
> > +	ret = readl_poll_timeout_atomic(ptr, result,
> > +					((result & mask) == done ||
> > +					 result == U32_MAX),
> > +					1, usec);
> > +	if (result == U32_MAX)		/* device unplugged */
> > +		return -ENODEV;
> > +
> > +	return ret;
> >  }
> >  
> >  static const struct usb_ep_ops net2280_ep_ops;
> > -- 
> 
> Acked-by: Alan Stern <stern@...land.harvard.edu>
> 
> However, I noticed that the kerneldoc for readl_poll_timeout_atomic() is 
> out of date.  Can you fix it up?
Ok, will do it, thanks

> 
> Alan Stern