Re: 2.6.24-rc4-mm1 and Very Slow PCMCIA Compact Flash

[Robert Hancock]

Zan Lynx wrote:
> On Fri, 2007-12-07 at 15:22 -0800, Andrew Morton wrote:
> > On Fri, 07 Dec 2007 23:09:43 +0000
> > Zan Lynx <zlynx@xxxxxxx> wrote:
> >
> > > On Fri, 2007-12-07 at 15:02 -0800, Andrew Morton wrote:
> > > > On Fri, 07 Dec 2007 20:38:24 +0000
> > > > Zan Lynx <zlynx@xxxxxxx> wrote:
> > > >
> > > > > While I'm reporting problems I'll get this one out there.
> > > > >
> > > > > I normally use a USB-2 memory card reader but I also have a PCMCIA
> > > > > CompactFlash adapter that I use occasionally.  During the MM series
> > > > > kernels 2.6.22 and 23 (I am pretty sure) this didn't work at all.  I
> > > > > don't know about vanilla since I don't run that.
> > > > >
> > > > > Now with MM kernels 2.6.24 rc1-4 the PCMCIA adapter works again, but I
> > > > > only get read rates of 1.6 MB/s.  When it used to work in 2.6.20 I got
> > > > > at least 16 MB/s.  The card itself is capable of 30+ in the USB-2
> > > > > reader.
> [cut]
> > Oh, OK.  Hopefully the ata guys can help out with this.
> >
> > I don't know if it actually strictly a regression?  Did libata ever support
> > that device in any earlier kernels?
>
> That could be why it didn't work for a few kernel versions.  I
> reconfigured for a libata-only system a while back.  And, since I
> usually use the USB-2 flash reader I didn't care much about the PCMCIA.
>
> I will try reverting that patch later tonight, in a few hours.

It looks like pata_pcmcia is always PIO mode 0:

/**
 *	pcmcia_init_one		-	attach a PCMCIA interface
 *	@pdev: pcmcia device
 *
 *	Register a PCMCIA IDE interface. Such interfaces are PIO 0 and
 *	shared IRQ.
 */

I assume that with old IDE this would use ide_cs.c, but I'm drawing a 
blank on what modes that supports..

--
Robert Hancock      Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/

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