linux-kernel - Re: [PATCH] MMC: move regulator handling closer to core

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Date:	Tue, 31 Aug 2010 16:35:31 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Adrian Hunter <adrian.hunter@...ia.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Mack <daniel@...aq.de>,
	Pierre Ossman <pierre@...man.eu>,
	Matt Fleming <matt@...sole-pimps.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Eric Miao <eric.y.miao@...il.com>,
	Cliff Brake <cbrake@...-systems.com>,
	"Lavinen Jarkko (Nokia-MS/Helsinki)" <jarkko.lavinen@...ia.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Tony Lindgren <tony@...mide.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Sundar Iyer <sundar.iyer@...ricsson.com>,
	Bengt Jonsson <bengt.jonsson@...ricsson.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] MMC: move regulator handling closer to core

2010/8/30 Adrian Hunter <adrian.hunter@...ia.com>:

> [Me]
>> diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
>> index 0a4e43f..47dae9b 100644
>> --- a/drivers/mmc/host/pxamci.c
>> +++ b/drivers/mmc/host/pxamci.c
>> @@ -99,14 +99,26 @@ static inline void pxamci_init_ocr(struct pxamci_host
>> *host)
>>        }
>>  }
>>  -static inline void pxamci_set_power(struct pxamci_host *host, unsigned
>> int vdd)
>> +static inline void pxamci_set_power(struct pxamci_host *host,
>> +                                   unsigned char power_mode,
>> +                                   unsigned int vdd)
>>  {
>>        int on;
>>  -#ifdef CONFIG_REGULATOR
>> -       if (host->vcc)
>> -               mmc_regulator_set_ocr(host->vcc, vdd);
>> -#endif
>> +       if (host->vcc) {
>> +               int ret;
>> +
>> +               if (power_mode == MMC_POWER_UP) {
>> +                       ret = mmc_regulator_set_ocr(host->mmc, host->vcc,
>> vdd);
>> +                       if (ret)
>> +                               dev_err(mmc_dev(host->mmc),
>> +                                       "could not set regulator OCR\n");
>> +               } else if (power_mode == MMC_POWER_OFF)
>> +                       ret = mmc_regulator_set_ocr(host->mmc, host->vcc,
>> 0);
>> +                       if (ret)
>> +                               dev_err(mmc_dev(host->mmc),
>> +                                       "could not disable regulator\n");
>> +       }
>
> mmc_power_off() does set ios->vdd to 0 so the original code was fine
> wrt to ignoring power_mode.

Yeah I know. This bit was to increase readability, explicitly showing
the power state like this makes it more clear what is happening I think.

The rest of the comments are fixed, new patch soon.

Yours,
Linus Walleij
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