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

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Message-ID: <Pine.LNX.4.64.0912172113510.5991@axis700.grange>
Date:	Thu, 17 Dec 2009 21:25:52 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	Ian Molton <ian@...menth.co.uk>
Subject: Re: [PATCH/RFC] tmio_mmc: keep card-detect interrupts enabled

Hi Andrew

I originally submitted this [1] patch on the 6th of November, then 
accidentally the MMC list got dropped from CC and the discussion moved to 
another irrelevant list, Ian's last reply is at [2]. Unfortunately, Ian 
hasn't replied to my reminders since then, and I don't see this patch 
anywhere upstream. Is there any way we could get it into 2.6.33?

Thanks
Guennadi

[1] http://thread.gmane.org/gmane.linux.kernel.mmc/704
[2] http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/11981/focus=11995

On Wed, 16 Dec 2009, Guennadi Liakhovetski wrote:

> On Sat, 28 Nov 2009, Guennadi Liakhovetski wrote:
> 
> > On Tue, 10 Nov 2009, Ian Molton wrote:
> > 
> > > Well if they are only masked they shouldnt stop being asserted. But we
> > > should unmask them again.
> > > 
> > > Im not really sure we should mask them anyway, with the card possibly
> > > being gone... Will need to look into it further.
> > 
> > Hi Ian
> > 
> > What's the status of this patch? Are you going to queue it for 2.6.33?
> 
> Ian, ping? I still don't see this patch in any (Linus' / next) upstream 
> tree and the merge window will be closing soon. Any update?
> 
> Thanks
> Guennadi
> 
> > 
> > Thanks
> > Guennadi
> > 
> > > 
> > > 2009/11/9 Guennadi Liakhovetski <g.liakhovetski@....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@....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@....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@....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/
> > > >
> > > 
> > > 
> > > 
> > > -- 
> > > Ian Molton
> > > Linux, Automotive, and other hacking:
> > > http://www.mnementh.co.uk/
> > > 
> > 
> > ---
> > Guennadi Liakhovetski
> > 
> 
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer
> http://www.open-technology.de/
> 

---
Guennadi Liakhovetski
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