linux-kernel - Re: [PATCH 20/32] omap_hsmmc: put MMC regulator to sleep

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Message-ID: <4A6BF8DB.2020100@nokia.com>
Date:	Sun, 26 Jul 2009 09:34:03 +0300
From:	Adrian Hunter <adrian.hunter@...ia.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"pierre@...man.eu" <pierre@...man.eu>,
	"Lavinen Jarkko (Nokia-D/Helsinki)" <jarkko.lavinen@...ia.com>,
	"Karpov Denis.2 (EXT-Teleca/Helsinki)" <ext-denis.2.karpov@...ia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 20/32] omap_hsmmc: put MMC regulator to sleep

Andrew Morton wrote:
> On Fri, 10 Jul 2009 15:42:27 +0300
> Adrian Hunter <adrian.hunter@...ia.com> wrote:
> 
>> +static int omap_mmc_regsleep_to_enabled(struct mmc_omap_host *host)
>> +{
>> +	unsigned long timeout;
>> +
>> +	dev_dbg(mmc_dev(host->mmc), "REGSLEEP -> ENABLED\n");
>> +
>> +	clk_enable(host->fclk);
>> +	clk_enable(host->iclk);
>> +
>> +	if (clk_enable(host->dbclk))
>> +		dev_dbg(mmc_dev(host->mmc),
>> +			"Enabling debounce clk failed\n");
>> +
>> +	omap_mmc_restore_ctx(host);
>> +
>> +	/*
>> +	 * We turned off interrupts and bus power.  Interrupts
>> +	 * are turned on by 'mmc_omap_start_command()' so we
>> +	 * just need to turn on the bus power here.
>> +	 */
>> +	OMAP_HSMMC_WRITE(host->base, HCTL,
>> +			 OMAP_HSMMC_READ(host->base, HCTL) | SDBP);
>> +
>> +	timeout = jiffies + msecs_to_jiffies(MMC_TIMEOUT_MS);
>> +	while ((OMAP_HSMMC_READ(host->base, HCTL) & SDBP) != SDBP &&
>> +	       time_before(jiffies, timeout))
>> +		;
>> +
>> +	if (mmc_slot(host).set_sleep)
>> +		mmc_slot(host).set_sleep(host->dev, host->slot_id,
>> +					 0, host->vdd, 0);
>> +
>> +	host->dpm_state = ENABLED;
>> +
>> +	return 0;
>> +}
> 
> We take no action if the wait for SDBP timed out?

Yeah that is on my TODO list, but SDBP (and other bits we wait for)
will not timeout unless the hardware is broken or there is a bug
in the driver.  In either of those cases we are ruined anyway.

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