linux-kernel - Re: [PATCH 1/3] mmc: sdhci: let GPIO based card detection have higher precedence

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Message-ID: <1435317174.32171.9.camel@linaro.org>
Date:	Fri, 26 Jun 2015 14:12:54 +0300
From:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	Tim Kryger <tim.kryger@...il.com>,
	Aisheng Dong <b29396@...escale.com>, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/3] mmc: sdhci: let GPIO based card detection have
 higher precedence


On Fri, 2015-06-26 at 14:09 +0300, Adrian Hunter wrote:
> On 26/06/15 14:00, Ivan T. Ivanov wrote:
> > On Fri, 2015-06-26 at 13:19 +0300, Adrian Hunter wrote:
> > > On 26/06/15 13:00, Ivan T. Ivanov wrote:
> > > > Controller could have BROKEN_CARD_DETECTION quirk set, but drivers
> > > > could use GPIO to detect card present state. Let, when defined, GPIO
> > > > take precedence, so drivers could properly detect card state and not
> > > > use polling.
> > > > 
> > > > Signed-off-by: Ivan T. Ivanov ivanov@...aro.org>
> > > > ---
> > > >  drivers/mmc/host/sdhci.c | 11 +++++++----
> > > >  1 file changed, 7 insertions(+), 4 deletions(-)
> > > > 
> > > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > > > index bc14452..8bafb9f 100644
> > > > --- a/drivers/mmc/host/sdhci.c
> > > > +++ b/drivers/mmc/host/sdhci.c
> > > > @@ -1601,15 +1601,18 @@ static int sdhci_do_get_cd(struct sdhci_host *host)
> > > >         if (host->flags & SDHCI_DEVICE_DEAD)
> > > >                 return 0;
> > > > 
> > > > +       /*
> > > > +               * Try slot gpio detect, if defined it take precedence
> > > > +               * over build in controller functionality
> > > > +               */
> > > > +       if (!IS_ERR_VALUE(gpio_cd))
> > > > +               return !!gpio_cd;
> > > > +
> > > 
> > > You've also put it above the MMC_CAP_NONREMOVABLE check which doesn't seem
> > > right.
> > > 
> > 
> > Probably, but what are the chances that this is valid GIO for non-removable cards.
> > I could rework it if you insist.
> 
> It is nicer not to have to think "what are the chances", and nicer that the
> logic is strictly correct, so yes please.
> 

Sure, will do.

Thanks,
Ivan
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