From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
Rob Herring <rob.herring@calxeda.com>
Subject: Re: [PATCH 3/3] ARM: footbridge: restore allocation of CSR I/O resource
Date: Fri, 26 Mar 2021 13:40:19 +0000 [thread overview]
Message-ID: <20210326134019.GS1463@shell.armlinux.org.uk> (raw)
In-Reply-To: <CAK8P3a1LP-KqjpYBnJ2Vubc2nrMema8CcRz7xiCjA_KSwrth1w@mail.gmail.com>
On Fri, Mar 26, 2021 at 02:37:39PM +0100, Arnd Bergmann wrote:
> On Fri, Mar 26, 2021 at 1:18 PM Russell King <rmk+kernel@armlinux.org.uk> wrote:
> >
> > Commit 8ef6e6201b2 ("ARM: footbridge: use fixed PCI i/o mapping") made
> > two changes: it contains what it says in the summary line, but it also
> > removes the CSR I/O allocation, which effectively means the DC21285
> > responds to I/O accesses at address 0..0x7f, which overlap Southbridge
> > ISA resources on the same PCI bus.
> >
> > This commit fixes it, but depends on the previous two commits removing
> > the bus level PCI I/O resource:
> > ARM: footbridge: avoid using separate PCI I/O bus resource
> > ARM: pci: make bus I/O resources optional
> >
> > Fixes: 8ef6e6201b2 ("ARM: footbridge: use fixed PCI i/o mapping")
> > Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
>
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
>
> This fix is needed regardless of which way the first patch fixes the
> bus resource.
This fix is dependent on the first patch as I said above - otherwise
the allocation will fail.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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prev parent reply other threads:[~2021-03-26 13:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-26 12:17 [PATCH 0/3] Fix Footbridge PCI I/O resources Russell King - ARM Linux admin
2021-03-26 12:18 ` [PATCH 1/3] ARM: pci: make bus I/O resources optional Russell King
2021-03-26 13:33 ` Arnd Bergmann
2021-03-26 13:39 ` Russell King - ARM Linux admin
2021-03-26 14:01 ` Arnd Bergmann
2021-03-26 12:18 ` [PATCH 2/3] ARM: footbridge: avoid using separate PCI I/O bus resource Russell King
2021-03-26 12:18 ` [PATCH 3/3] ARM: footbridge: restore allocation of CSR I/O resource Russell King
2021-03-26 13:37 ` Arnd Bergmann
2021-03-26 13:40 ` Russell King - ARM Linux admin [this message]
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