linux-kernel - Re: [PATCH 01/13] mmc: bcm2835: add bcm2835_read_wait

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Date:   Fri, 27 Jan 2017 11:28:32 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Shawn Lin <shawn.lin@...k-chips.com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        Stefan Wahren <stefan.wahren@...e.com>,
        Eric Anholt <eric@...olt.net>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>,
        "moderated list:BROADCOM BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/13] mmc: bcm2835: add bcm2835_read_wait_sdcmd

  Hi,

> > +	for (;;) {
> > +		value = readl(host->ioaddr + SDCMD);
> > +		if (!(value & SDCMD_NEW_FLAG))
> > +			break;
> > +		if (check_fail && (value & SDCMD_FAIL_FLAG))
> > +			break;
> > +		if (time_after(jiffies, end)) {
> > +			dev_err(dev, "%s: timeout (%d us)\n",
> > +				__func__, timeout);
> > +			break;
> > +		}
> > +
> > +		/* if it takes longer reduce poll interval */
> > +		if (time_after(jiffies, fastpoll))
> > +			udelay(10);
> > +		else
> > +			cpu_relax();
> > +	}
> 
> Use readl_poll_timeout intead of open-coding them..

Cool.  Didn't know this exists.  Incremental fixup attached.

thanks,
  Gerd


View attachment "0001-mmc-bcm2835-use-readl_poll_timeout-in-bcm2835_read_w.patch" of type "text/x-patch" (2245 bytes)