Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Mon, 22 Mar 2021 16:59:56 +0000
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
Message-ID: <20210322165956.GY1463@shell.armlinux.org.uk>
References: <20210318045706.200458-1-hch@lst.de>
 <20210318045706.200458-3-hch@lst.de>
 <20210319170753.GV1463@shell.armlinux.org.uk>
 <20210319175311.GW1463@shell.armlinux.org.uk>
 <20210322145403.GA30942@lst.de>
 <20210322151503.GX1463@shell.armlinux.org.uk>
 <20210322151823.GA2764@lst.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20210322151823.GA2764@lst.de>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Precedence: bulk

On Mon, Mar 22, 2021 at 04:18:23PM +0100, Christoph Hellwig wrote:
> On Mon, Mar 22, 2021 at 03:15:03PM +0000, Russell King - ARM Linux admin wrote:
> > It gets worse than that though - due to a change to remove
> > pcibios_min_io from the generic code, moving it into the ARM
> > architecture code, this has caused a regression that prevents the
> > legacy resources being registered against the bus resource. So even
> > if they are there, they cause probe failures. I haven't found a
> > reasonable way to solve this yet, but until there is, there is no
> > way that the PATA driver can be used as the "legacy mode" support
> > is effectively done via the PCI code assigning virtual IO port
> > resources.
> > 
> > I'm quite surprised that the CY82C693 even works on Alpha - I've
> > asked for a lspci for that last week but nothing has yet been
> > forthcoming from whoever responded to your patch for Alpha - so I
> > can't compare what I'm seeing with what's happening with Alpha.
> 
> That sounds like something we could fix with a quirk for function 2
> in the PCI resource assignment code.  Can you show what vendor and
> device ID function 2 has so that I could try to come up with one?

I already have a quirk in arch/arm/kernel/bios32.c for this - but it
is no longer sufficient due to changes in the PCI layer, where much
of this is documented.

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