linux-kernel - Re: [v2 PATCH] usb: gadget: bdc: use readl_poll

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Message-ID: <1594623300.23885.36.camel@mhfsdcap03>
Date:   Mon, 13 Jul 2020 14:55:00 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Florian Fainelli <f.fainelli@...il.com>
CC:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Stephen Boyd <swboyd@...omium.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [v2 PATCH] usb: gadget: bdc: use readl_poll_timeout() to
 simplify code

On Sun, 2020-07-12 at 20:53 -0700, Florian Fainelli wrote:
> 
> On 7/12/2020 8:30 PM, Chunfeng Yun wrote:
> > Use readl_poll_timeout() to poll register status
> > 
> > Cc: Florian Fainelli <f.fainelli@...il.com>
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> > v2 changes, suggested by Stephen:
> >   1. use unsigned int instead of int for @usec parameter
> >   2. add dev_log() back
> >   3. drop "Err" in error log
> > ---
> >  drivers/usb/gadget/udc/bdc/bdc_core.c | 26 +++++++++++---------------
> >  1 file changed, 11 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
> > index 02a3a77..53dccb1 100644
> > --- a/drivers/usb/gadget/udc/bdc/bdc_core.c
> > +++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
> > @@ -12,6 +12,7 @@
> >  #include <linux/spinlock.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/interrupt.h>
> > +#include <linux/iopoll.h>
> >  #include <linux/ioport.h>
> >  #include <linux/io.h>
> >  #include <linux/list.h>
> > @@ -29,24 +30,19 @@
> >  #include "bdc_dbg.h"
> >  
> >  /* Poll till controller status is not OIP */
> > -static int poll_oip(struct bdc *bdc, int usec)
> > +static int poll_oip(struct bdc *bdc, u32 usec)
> >  {
> >  	u32 status;
> > -	/* Poll till STS!= OIP */
> > -	while (usec) {
> > -		status = bdc_readl(bdc->regs, BDC_BDCSC);
> > -		if (BDC_CSTS(status) != BDC_OIP) {
> > -			dev_dbg(bdc->dev,
> > -				"poll_oip complete status=%d",
> > -				BDC_CSTS(status));
> > -			return 0;
> > -		}
> > -		udelay(10);
> > -		usec -= 10;
> > -	}
> > -	dev_err(bdc->dev, "Err: operation timedout BDCSC: 0x%08x\n", status);
> > +	int ret;
> >  
> > -	return -ETIMEDOUT;
> > +	ret = readl_poll_timeout(bdc->regs + BDC_BDCSC, status,
> > +		(BDC_CSTS(status) != BDC_OIP), 10, usec);
> 
> You could probably indent this to the opening parenthesis, 
Done, v3 is sent out, thanks

> but with or
> without it:
> 
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> 
> and thanks for picking up the MAINTAINERS file update ;)
> 
> > +	if (ret)
> > +		dev_err(bdc->dev, "operation timedout BDCSC: 0x%08x\n", status);
> > +	else
> > +		dev_dbg(bdc->dev, "%s complete status=%d", __func__, BDC_CSTS(status));
> > +
> > +	return ret;
> >  }
> >  
> >  /* Stop the BDC controller */
> > 
>