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

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Message-id: <1512445.DtnT51NQqg@amdc3058>
Date:   Mon, 31 Oct 2016 19:24:46 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
        Olof Johansson <olof@...om.net>,
        Kevin Hilman <khilman@...libre.com>,
        "Nori, Sekhar" <nsekhar@...com>
Subject: Re: [RESEND PATCH] arm: assabet_defconfig: disable IDE subsystem

On Monday, October 31, 2016 07:14:13 PM Bartlomiej Zolnierkiewicz wrote:
> 
> Hi,
> 
> 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:
> > > 
> > > Hi,
> > > 
> > > On Wednesday, July 13, 2016 04:37:31 PM Arnd Bergmann wrote:
> > > > On Wednesday, July 13, 2016 12:59:23 PM CEST Bartlomiej Zolnierkiewicz wrote:
> > > > > 
> > > > > On Friday, July 08, 2016 10:23:48 PM Arnd Bergmann wrote:
> > > > > > On Friday, July 8, 2016 5:24:41 PM CEST Bartlomiej Zolnierkiewicz wrote:
> > > > > > > This patch disables deprecated IDE subsystem in assabet_defconfig
> > > > > > > (no IDE host drivers are selected in this config so there is no
> > > > > > > valid reason to enable IDE subsystem itself).
> > > > > > > 
> > > > > > > Cc: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> > > > > > > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> > > > > > 
> > > > > > I think the series makes a lot of sense. I have checked your assertions
> > > > > > in the changelogs and found no flaws in your logic, so I think we should
> > > > > > take them all through arm-soc unless there are other concerns.
> > > > > 
> > > > > Thank you.
> > > > > 
> > > > > Should I resend everything or just patches that were not reposted yet
> > > > > (the ones that were marked as RFT initially and got no feedback)?
> > > > 
> > > > 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.. :-)

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics