Re: [PATCH/RFC] tmio_mmc: keep card-detect interrupts enabled

[Guennadi Liakhovetski <g.liakhovetski@gmx.de>]

(re-adding accidentally dropped ML)

On Mon, 9 Nov 2009, Ian Molton wrote:

> Well, I presume we want to know when the card gets removed :)

Sure, that's why we shouldn't mask those interrupts:-) If they do get 
masked and missed, I do not know, if the interrupt remains pending in this 
case, because they never get detected then:)

> 
> 2009/11/9 Guennadi Liakhovetski <g.liakhovetski@gmx.de>:
> > Hi Ian
> >
> > Why did you drop all CCs?
> >
> > On Mon, 9 Nov 2009, Ian Molton wrote:
> >
> >> I havent looked at the consequences for the driver if a insert IRQ
> >> occurs during IO, however it seems logical that we should not
> >> permanently mask the IRQ.
> >>
> >> I presume that the IRQ remains pending?
> >
> > Don't know, never checked. Is this important to know?
> >
> > Thanks
> > Guennadi
> >
> >>
> >> 2009/11/6 Guennadi Liakhovetski <g.liakhovetski@gmx.de>:
> >> > On SuperH platforms the SDHI controller does not produce any command IRQs
> >> > after a completed IO. This leads to card-detect interrupts staying
> >> > disabled. Do not disable card-detect interrupts on DATA IRQs.
> >> >
> >> > Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
> >> > ---
> >> >
> >> > Marked as RFC because I'm not really sure this is a correct approach to
> >> > fix this problem, and whether this will have negative effect on other
> >> > tmio_mmc MFD users.
> >> >
> >> > diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
> >> > index c676767..0b31d44 100644
> >> > --- a/drivers/mmc/host/tmio_mmc.h
> >> > +++ b/drivers/mmc/host/tmio_mmc.h
> >> > @@ -55,10 +55,8 @@
> >> >  /* Define some IRQ masks */
> >> >  /* This is the mask used at reset by the chip */
> >> >  #define TMIO_MASK_ALL           0x837f031d
> >> > -#define TMIO_MASK_READOP  (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND | \
> >> > -               TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
> >> > -#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND | \
> >> > -               TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
> >> > +#define TMIO_MASK_READOP  (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
> >> > +#define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
> >> >  #define TMIO_MASK_CMD     (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
> >> >                TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
> >> >  #define TMIO_MASK_IRQ     (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/