linux-kernel - Re: [RESEND PATCH] arm: assabet_defconfig: disable IDE subsystem

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Message-ID: <2979452.etgg2fh1hR@wuerfel>
Date:   Fri, 25 Nov 2016 23:22:33 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        Kevin Hilman <khilman@...libre.com>,
        "Nori, Sekhar" <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-ide@...r.kernel.org, Olof Johansson <olof@...om.net>
Subject: Re: [RESEND PATCH] arm: assabet_defconfig: disable IDE subsystem

On Monday, October 31, 2016 7:24:46 PM CET Bartlomiej Zolnierkiewicz wrote:
> On Monday, October 31, 2016 07:14:13 PM Bartlomiej Zolnierkiewicz wrote:
> > On Monday, October 31, 2016 03:46:22 PM Russell King - ARM Linux wrote:
> > > On Wed, Oct 26, 2016 at 07:01:12PM +0200, Bartlomiej Zolnierkiewicz wrote:
> > > > > I'd be fine with just getting a pull request with all the patches that
> > > > > had no negative feedback and that were not already applied (if any).
> > > > 
> > > > Here it is (sorry for taking so long).
> > > 
> > > I've just been digging in the dmesg logs from when I was using the
> > > Assabet+Neponset as my firewall, and it was having to use the IDE
> > > ide-cs driver rather than the pata pcmcia driver.
> > > 
> > > I don't recall whether the pata pcmcia driver was a problem or not,
> > > as the PCMCIA interface can't cope with _any_ 32-bit accesses.  I
> > > think PATA tries to use the "highest" possible access size by
> > > default...
> > 
> > It doesn't actually - it defaults to 16-bits for PIO data access and
> > you must explicitly enable 32-bits using ATA_PFLAG_PIO32 port flag
> > (pata_pcmcia doesn't set it so it should be okay).  Also taskfile
> > registers are accessed using 8-bits access by default transport
> > functions (which are used by pata_pcmcia).
> 
> Please also note that:
> 
> - assebet_defconfig currently doesn't even enable ide-cs
>   (CONFIG_BLK_DEV_IDECS) in the mainline kernel
> 
> - neponset_defconfig doesn't even enable IDE (CONFIG_IDE)
>   in the mainline kernel
> 
> so there is no risk of breaking anything.. 

I noticed this older pull request in my todo folder, my interpretation
is that the concern was resolved and we simply missed it.

I've pulled it into next/defconfig for v4.10 now, with the above
in the merge commit text for reference.

Thanks,

	Arnd