linux-kernel - Re: [PATCH 0/4] ARM: footbridge: cleanups

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Date:   Sun, 4 Sep 2022 13:09:42 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Arnd Bergmann <arnd@...db.de>, Christoph Hellwig <hch@....de>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 0/4] ARM: footbridge: cleanups

On Sun, Sep 04, 2022 at 12:43:48PM +0100, Marc Zyngier wrote:
> On Thu, 18 Aug 2022 22:15:46 +0100,
> Arnd Bergmann <arnd@...nel.org> wrote:
> > 
> > From: Arnd Bergmann <arnd@...db.de>
> > 
> > I had an older patch to remove the addin mode for footbridge,
> > which nobody is using any more, and I found a few other small
> > cleanups that are worth doing here.
> > 
> > Footbridge is now the only platform with a custom __virt_to_bus()
> > for ISA DMA, and a custom phys_to_dma() for PCI devices. Both
> > just add a fixed offset, so there is probably a better way
> > of doing the same without a custom helper function.
> > 
> >      Arnd
> > 
> > Arnd Bergmann (4):
> >   ARM: footbridge: remove addin mode
> >   ARM: footbridge: remove leftover from personal-server
> >   ARM: footbridge: move isa-dma support into footbridge
> >   ARM: footbridge: limit CONFIG_ISA to CATS
> > 
> >  arch/arm/Kconfig                              |  5 --
> >  arch/arm/include/asm/hardware/dec21285.h      | 13 ----
> >  arch/arm/kernel/Makefile                      |  1 -
> >  arch/arm/mach-footbridge/Kconfig              | 30 +-------
> >  arch/arm/mach-footbridge/Makefile             |  5 +-
> >  arch/arm/mach-footbridge/common.c             | 73 ++-----------------
> >  arch/arm/mach-footbridge/dc21285.c            | 61 +++++-----------
> >  .../arm/{kernel => mach-footbridge}/dma-isa.c |  7 +-
> >  arch/arm/mach-footbridge/dma.c                | 58 ---------------
> >  .../mach-footbridge/include/mach/isa-dma.h    | 14 +---
> >  .../arm/mach-footbridge/include/mach/memory.h | 22 ------
> >  arch/arm/mach-footbridge/isa.c                | 14 ++--
> >  drivers/tty/serial/21285.c                    |  3 -
> >  13 files changed, 42 insertions(+), 264 deletions(-)
> >  rename arch/arm/{kernel => mach-footbridge}/dma-isa.c (98%)
> >  delete mode 100644 arch/arm/mach-footbridge/dma.c
> > 
> > -- 
> > 2.29.2
> > 
> > Cc: Russell King <linux@...linux.org.uk>
> > Cc: Christoph Hellwig <hch@....de>
> > Cc: Linus Walleij <linus.walleij@...aro.org>
> > Cc: Marc Zyngier <maz@...nel.org>
> 
> I finally managed to give this a go on my netwinder using v2 of patch
> 5/4 (!), and the box booted nicely.
> 
> Note that apart from the serial console, everything I'm using on this
> box is PCI (I tried to enable sound and failed, probably because I
> can't select CONFIG_ISA anymore on this machine).

That tends to mean, therefore, that the statement "CONFIG_ISA is for
add-in cards" is wrong, because it's caused a user-visible regression
by killing sound support on Netwinders!

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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