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From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Christoph Hellwig <hch@lst.de>
Cc: "David S. Miller" <davem@davemloft.net>,
	Jens Axboe <axboe@kernel.dk>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Richard Henderson <rth@twiddle.net>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Matt Turner <mattst88@gmail.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Michael Ellerman <mpe@ellerman.id.au>,
	linux-ide@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 02/10] ARM: disable CONFIG_IDE in footbridge_defconfig
Date: Fri, 19 Mar 2021 17:07:53 +0000	[thread overview]
Message-ID: <20210319170753.GV1463@shell.armlinux.org.uk> (raw)
In-Reply-To: <20210318045706.200458-3-hch@lst.de>

On Thu, Mar 18, 2021 at 05:56:58AM +0100, Christoph Hellwig wrote:
> footbridge_defconfig enables CONFIG_IDE but no actual host controller
> driver, so just drop it.

I have been using the Cypress 82C693 IDE driver on Footbridge for a
CD ROM drive, and I know it doesn't work with the PATA driver - as
I need to disable BM DMA, otherwise the 82C693/DC21285 combination
deadlocks the PCI bus. The PATA driver doesn't support disabling
BM DMA without disabling it for all PATA ports, which is really
annoying for my IT821x card in the same machine.

So, I'm rather stuck using the PATA driver for the HDDs and the
IDE driver for the CD ROM.

That said, a commit a while back "cleaning up" the PCI layer appears
to have totally shafted the 82C693, as the kernel tries to request
IO resources at the legacy IDE addresses against the PCI bus resource
which only covers 0x1000-0xffff. Hence, the 82C693 IDE ports are non-
functional at the moment.

I'm debating about trying to find a fix to the PCI breakage that was
introduced by "ARM: move PCI i/o resource setup into common code".

I hadn't noticed it because I don't use the CD ROM drive very often,
and I don't upgrade the kernel that often either on the machine -
but it has been running 24x7 for almost two decades.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!

  reply	other threads:[~2021-03-19 17:09 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-18  4:56 remove the legacy ide driver Christoph Hellwig
2021-03-18  4:56 ` [PATCH 01/10] alpha: use libata instead of " Christoph Hellwig
2021-03-18  5:54   ` Al Viro
2021-03-18  6:07     ` Christoph Hellwig
2021-03-18 17:09       ` Måns Rullgård
2021-03-18 18:03         ` Måns Rullgård
2021-03-18  7:54     ` John Paul Adrian Glaubitz
2021-03-19 16:23     ` Serge Belyshev
2021-03-18  4:56 ` [PATCH 02/10] ARM: disable CONFIG_IDE in footbridge_defconfig Christoph Hellwig
2021-03-19 17:07   ` Russell King - ARM Linux admin [this message]
2021-03-19 17:53     ` Russell King - ARM Linux admin
2021-03-22 14:54       ` Christoph Hellwig
2021-03-22 15:15         ` Russell King - ARM Linux admin
2021-03-22 15:18           ` Christoph Hellwig
2021-03-22 15:33             ` Christoph Hellwig
2021-03-23 14:03               ` Russell King - ARM Linux admin
2021-03-22 16:59             ` Russell King - ARM Linux admin
2021-03-22 16:09           ` John Paul Adrian Glaubitz
2021-03-22 16:47             ` Cye Borg
2021-03-22 17:03             ` Russell King - ARM Linux admin
2021-03-22 17:10               ` Cye Borg
2021-03-23 18:43                 ` Russell King - ARM Linux admin
2021-03-24  5:47                   ` Cye Borg
2021-03-18  4:56 ` [PATCH 03/10] ARM: disable CONFIG_IDE in pxa_defconfig Christoph Hellwig
2021-03-18  4:57 ` [PATCH 04/10] MIPS: disable CONFIG_IDE in sb1250_swarm_defconfig Christoph Hellwig
2021-03-19  0:12   ` Maciej W. Rozycki
2021-03-24  9:59   ` Thomas Bogendoerfer
2021-03-18  4:57 ` [PATCH 05/10] MIPS: switch workpad_defconfig from legacy IDE to libata Christoph Hellwig
2021-03-24 10:00   ` Thomas Bogendoerfer
2021-03-18  4:57 ` [PATCH 06/10] MIPS: disable CONFIG_IDE in rbtx49xx_defconfig Christoph Hellwig
2021-03-24 10:00   ` Thomas Bogendoerfer
2021-03-18  4:57 ` [PATCH 07/10] MIPS: disable CONFIG_IDE in bigsur_defconfig Christoph Hellwig
2021-03-18 10:08   ` Sergei Shtylyov
2021-03-24 10:00   ` Thomas Bogendoerfer
2021-03-18  4:57 ` [PATCH 08/10] MIPS: disable CONFIG_IDE in malta*_defconfig Christoph Hellwig
2021-03-18 10:12   ` Sergei Shtylyov
2021-03-18 14:19   ` Thomas Bogendoerfer
2021-03-19 13:03     ` Christoph Hellwig
2021-03-24 10:01   ` Thomas Bogendoerfer
2021-03-18  4:57 ` [PATCH 09/10] m68k: use libata instead of the legacy ide driver Christoph Hellwig
2021-03-18  4:57 ` [PATCH 10/10] ide: remove " Christoph Hellwig
2021-03-20  3:44   ` Maciej W. Rozycki
2021-03-20  4:04     ` Maciej W. Rozycki
2021-03-19  1:43 ` Finn Thain
2021-03-19  5:43   ` Christoph Hellwig
2021-03-19 16:48 ` Maciej W. Rozycki
2021-03-21  9:20 ` John Paul Adrian Glaubitz

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