linux-kernel - Re: [PATCH net-next v2 1/2] net: stmmac: use readl_poll_timeout() function in init

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Message-ID: <20200316021740.GA3024@nuc8i5>
Date:   Mon, 16 Mar 2020 10:17:40 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, davem@...emloft.net,
        mcoquelin.stm32@...il.com, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v2 1/2] net: stmmac: use readl_poll_timeout()
 function in init_systime()

On Sun, Mar 15, 2020 at 07:25:04PM +0100, Andrew Lunn wrote:

Hi Andrew and David :

> On Sun, Mar 15, 2020 at 11:03:00PM +0800, Dejin Zheng wrote:
> > The init_systime() function use an open coded of readl_poll_timeout().
> > Replace the open coded handling with the proper function.
> > 
> > Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
> > ---
> > v1 -> v2:
> > 	- no changed.
> > 
> >  .../net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c  | 14 ++++++--------
> >  1 file changed, 6 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
> > index 020159622559..2a24e2a7db3b 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_hwtstamp.c
> > @@ -10,6 +10,7 @@
> >  *******************************************************************************/
> >  
> >  #include <linux/io.h>
> > +#include <linux/iopoll.h>
> >  #include <linux/delay.h>
> >  #include "common.h"
> >  #include "stmmac_ptp.h"
> > @@ -53,8 +54,8 @@ static void config_sub_second_increment(void __iomem *ioaddr,
> >  
> >  static int init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
> >  {
> > -	int limit;
> >  	u32 value;
> > +	int err;
> >  
> >  	writel(sec, ioaddr + PTP_STSUR);
> >  	writel(nsec, ioaddr + PTP_STNSUR);
> > @@ -64,13 +65,10 @@ static int init_systime(void __iomem *ioaddr, u32 sec, u32 nsec)
> >  	writel(value, ioaddr + PTP_TCR);
> >  
> >  	/* wait for present system time initialize to complete */
> > -	limit = 10;
> > -	while (limit--) {
> > -		if (!(readl(ioaddr + PTP_TCR) & PTP_TCR_TSINIT))
> > -			break;
> > -		mdelay(10);
> > -	}
> > -	if (limit < 0)
> > +	err = readl_poll_timeout(ioaddr + PTP_TCR, value,
> > +				 !(value & PTP_TCR_TSINIT),
> > +				 10000, 100000);
> > +	if (err)
> >  		return -EBUSY;
> 
> Hi Dejin
> 
> It is normal to just return whatever error code readl_poll_timeout()
> returned.
> 
> 	Andrew

You are right. I will modify it. Thanks!

BR,
Dejin