linux-kernel - Re: [PATCH v2 09/11] usb: phy: phy-mv-usb: convert to readl_poll_timeout

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Date:   Fri, 21 Aug 2020 09:52:10 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>
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 v2 09/11] usb: phy: phy-mv-usb: convert to
 readl_poll_timeout_atomic()

On Thu, 2020-08-20 at 13:17 +0300, Sergei Shtylyov wrote:
> On 20.08.2020 8:45, Chunfeng Yun wrote:
> 
> > Use readl_poll_timeout_atomic() to simplify code
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> > v2: udelay 10us instead of 20us according to kerneldoc
> > ---
> >   drivers/usb/phy/phy-mv-usb.c | 16 +++++++---------
> >   1 file changed, 7 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/usb/phy/phy-mv-usb.c b/drivers/usb/phy/phy-mv-usb.c
> > index ce767ec..e801569 100644
> > --- a/drivers/usb/phy/phy-mv-usb.c
> > +++ b/drivers/usb/phy/phy-mv-usb.c
> > @@ -8,6 +8,7 @@
> >   #include <linux/module.h>
> >   #include <linux/kernel.h>
> >   #include <linux/io.h>
> > +#include <linux/iopoll.h>
> >   #include <linux/uaccess.h>
> >   #include <linux/device.h>
> >   #include <linux/proc_fs.h>
> > @@ -135,8 +136,8 @@ static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
> >   
> >   static int mv_otg_reset(struct mv_otg *mvotg)
> >   {
> > -	unsigned int loops;
> >   	u32 tmp;
> > +	int ret;
> >   
> >   	/* Stop the controller */
> >   	tmp = readl(&mvotg->op_regs->usbcmd);
> > @@ -146,15 +147,12 @@ static int mv_otg_reset(struct mv_otg *mvotg)
> >   	/* Reset the controller to get default values */
> >   	writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
> >   
> > -	loops = 500;
> > -	while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
> > -		if (loops == 0) {
> > -			dev_err(&mvotg->pdev->dev,
> > +	ret = readl_poll_timeout_atomic(&mvotg->op_regs->usbcmd, tmp,
> > +				(tmp & USBCMD_CTRL_RESET), 10, 10000);
> > +	if (ret < 0) {
> > +		dev_err(&mvotg->pdev->dev,
> >   				"Wait for RESET completed TIMEOUT\n");
> 
>     You forgot to re-align this argument, it should start under & on the 
> previous line...
Yes, will fix it, thanks

> 
> [...]
> 
> MBR, Sergei