From: TOMARI Hisanobu <posco.grubb@gmail.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: IDE cable detection on Apple PowerBook
Date: Wed, 18 Mar 2009 22:47:26 +0900 [thread overview]
Message-ID: <20090318224726.5cf83e23.posco.grubb@gmail.com> (raw)
In-Reply-To: <1237363097.25062.345.camel@pasglop>
I thought the short-40pin assumption would cause no problem
considering all models beginning with "PowerBook5" are laptops.
Do you mean an option to toggle this hack on/off should be present
in Kconfig?
Thanks,
TOMARI Hisanobu
On Wed, 18 Mar 2009 18:58:17 +1100
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> On Wed, 2009-03-18 at 14:06 +0900, TOMARI Hisanobu wrote:
> > Hello,
> >
> > I'm using an OCZ PATA SSD on Apple PowerBook5,4 computer.
> > The IDE drive fails to recognize 80-conductor cable that
> > connects the drive to motherboard to fall back to UDMA33.
> >
> > This patch fixes this behavior by assuming that the cable is
> > short-40pin when the model string matches "PowerBook5" and
> > the motherboard detects 80c cable.
> >
> > This patch is against drivers/ide/pmac.c in linux 2.6.28.8.
>
> The patch is too much of an ad-hoc hack... _maybe_ an option is to make
> the core fallback to 40 "short" when 80 pin detection fails on
> powerbooks instead ?
>
> Ben.
>
> > (before applying the patch) hdparm -i /dev/hda
> > /dev/hda:
> > Timing buffered disk reads: 90 MB in 3.03 seconds = 29.73 MB/sec
> > (dmesg 2.6.26)
> > ide0: Found Apple UniNorth ATA-6 controller, bus ID 3, irq 39
> > Probing IDE interface ide0...
> > hda: CORE_PATA, ATA DISK drive
> > hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4
> > hda: drive side 80-wire cable detection failed, limiting max speed to UDMA33
> > hda: UDMA/33 mode selected
> >
> > (after applying the patch) hdparm -i /dev/hda
> > /dev/hda:
> > Timing buffered disk reads: 240 MB in 3.02 seconds = 79.42 MB/sec
> > (dmesg 2.6.28.8)
> > ide-pmac: Found Apple UniNorth ATA-6 controller (PCI), bus ID 3, irq 39
> > Probing IDE interface ide0...
> > hda: CORE_PATA, ATA DISK drive
> > hda: host max PIO4 wanted PIO255(auto-tune) selected PIO4
> > hda: UDMA/100 mode selected
> > ide0 at 0xf102a000-0xf102a070,0xf102a160 on irq 39
> >
> >
> > _______________________________________________
> > Linuxppc-dev mailing list
> > Linuxppc-dev@ozlabs.org
> > https://ozlabs.org/mailman/listinfo/linuxppc-dev
>
next prev parent reply other threads:[~2009-03-18 13:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-18 5:06 IDE cable detection on Apple PowerBook TOMARI Hisanobu
2009-03-18 7:58 ` Benjamin Herrenschmidt
2009-03-18 13:47 ` TOMARI Hisanobu [this message]
2009-03-19 6:07 ` Benjamin Herrenschmidt
2009-03-19 6:08 ` Benjamin Herrenschmidt
2009-03-19 13:30 ` TOMARI Hisanobu
2009-03-19 13:41 ` Anton Vorontsov
2009-03-19 21:14 ` Benjamin Herrenschmidt
2009-03-20 6:27 ` Benjamin Herrenschmidt
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