linux-kernel - Re: [PATCH] libertas/sdio: 8686: set ECSI bit for 1-bit transfers

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Date:	Tue, 13 Apr 2010 12:29:54 +0200
From:	Daniel Mack <daniel@...aq.de>
To:	Dan Williams <dcbw@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Alagu Sankar <alagusankar@...wise.com>,
	Volker Ernst <volker.ernst@...r.com>,
	"John W. Linville" <linville@...driver.com>,
	Holger Schurig <hs4233@...l.mn-solutions.de>,
	Bing Zhao <bzhao@...vell.com>,
	libertas-dev@...ts.infradead.org, linux-wireless@...r.kernel.org,
	linux-mmc@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH] libertas/sdio: 8686: set ECSI bit for 1-bit transfers

On Tue, Apr 06, 2010 at 09:07:34AM -0700, Dan Williams wrote:
> On Tue, 2010-04-06 at 10:52 +0200, Daniel Mack wrote:
> > When operating in 1-bit mode, SDAT1 is used as dedicated interrupt line.
> > However, the 8686 will only drive this line when the ECSI bit is set in
> > the CCCR_IF register.
> > 
> > Thanks to Alagu Sankar for pointing me in the right direction.
> > 
> > Signed-off-by: Daniel Mack <daniel@...aq.de>
> > Cc: Alagu Sankar <alagusankar@...wise.com>
> > Cc: Volker Ernst <volker.ernst@...r.com>
> > Cc: Dan Williams <dcbw@...hat.com>
> > Cc: John W. Linville <linville@...driver.com>
> > Cc: Holger Schurig <hs4233@...l.mn-solutions.de>
> > Cc: Bing Zhao <bzhao@...vell.com>
> > Cc: libertas-dev@...ts.infradead.org
> > Cc: linux-wireless@...r.kernel.org
> > Cc: linux-mmc@...r.kernel.org
> 
> Acked-by: Dan Williams <dcbw@...hat.com>

Was this picked by anyone?
Just asking because I didn't see it in the wireless-2.6.git yet.

Thanks,
Daniel



> 
> > ---
> >  drivers/net/wireless/libertas/if_sdio.c |   22 ++++++++++++++++++++++
> >  include/linux/mmc/sdio.h                |    2 ++
> >  2 files changed, 24 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
> > index 7a73f62..33206a9 100644
> > --- a/drivers/net/wireless/libertas/if_sdio.c
> > +++ b/drivers/net/wireless/libertas/if_sdio.c
> > @@ -34,6 +34,8 @@
> >  #include <linux/mmc/card.h>
> >  #include <linux/mmc/sdio_func.h>
> >  #include <linux/mmc/sdio_ids.h>
> > +#include <linux/mmc/sdio.h>
> > +#include <linux/mmc/host.h>
> >  
> >  #include "host.h"
> >  #include "decl.h"
> > @@ -942,6 +944,7 @@ static int if_sdio_probe(struct sdio_func *func,
> >  	int ret, i;
> >  	unsigned int model;
> >  	struct if_sdio_packet *packet;
> > +	struct mmc_host *host = func->card->host;
> >  
> >  	lbs_deb_enter(LBS_DEB_SDIO);
> >  
> > @@ -1022,6 +1025,25 @@ static int if_sdio_probe(struct sdio_func *func,
> >  	if (ret)
> >  		goto disable;
> >  
> > +	/* For 1-bit transfers to the 8686 model, we need to enable the
> > +	 * interrupt flag in the CCCR register. Set the MMC_QUIRK_LENIENT_FN0
> > +	 * bit to allow access to non-vendor registers. */
> > +	if ((card->model == IF_SDIO_MODEL_8686) &&
> > +	    (host->caps & MMC_CAP_SDIO_IRQ) &&
> > +	    (host->ios.bus_width == MMC_BUS_WIDTH_1)) {
> > +		u8 reg;
> > +
> > +		func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
> > +		reg = sdio_f0_readb(func, SDIO_CCCR_IF, &ret);
> > +		if (ret)
> > +			goto release_int;
> > +
> > +		reg |= SDIO_BUS_ECSI;
> > +		sdio_f0_writeb(func, reg, SDIO_CCCR_IF, &ret);
> > +		if (ret)
> > +			goto release_int;
> > +	}
> > +
> >  	card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
> >  	if (ret)
> >  		goto release_int;
> > diff --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
> > index 0ebaef5..329a8fa 100644
> > --- a/include/linux/mmc/sdio.h
> > +++ b/include/linux/mmc/sdio.h
> > @@ -94,6 +94,8 @@
> >  
> >  #define  SDIO_BUS_WIDTH_1BIT	0x00
> >  #define  SDIO_BUS_WIDTH_4BIT	0x02
> > +#define  SDIO_BUS_ECSI		0x20	/* Enable continuous SPI interrupt */
> > +#define  SDIO_BUS_SCSI		0x40	/* Support continuous SPI interrupt */
> >  
> >  #define  SDIO_BUS_ASYNC_INT	0x20
> >  
> 
> 
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