Re: [RFC 0/6] pcmcia: separate 16-bit support from cardbus

From: "Russell King (Oracle)" <linux@armlinux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Larry Finger <Larry.Finger@lwfinger.net>,
	Arnd Bergmann <arnd@kernel.org>,
	Dominik Brodowski <linux@dominikbrodowski.net>,
	linux-kernel@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Hartley Sweeten <hsweeten@visionengravers.com>,
	Ian Abbott <abbotti@mev.co.uk>, Jakub Kicinski <kuba@kernel.org>,
	Kevin Cernekee <cernekee@gmail.com>,
	Lukas Wunner <lukas@wunner.de>,
	Manuel Lauss <manuel.lauss@gmail.com>,
	Oliver Hartkopp <socketcan@hartkopp.net>,
	Olof Johansson <olof@lixom.net>,
	Robert Jarzmik <robert.jarzmik@free.fr>,
	YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-arm-kernel@lists.infradead.org, linux-can@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-wireless@vger.kernel.org, Netdev <netdev@vger.kernel.org>
Subject: Re: [RFC 0/6] pcmcia: separate 16-bit support from cardbus
Date: Mon, 27 Feb 2023 20:59:55 +0000	[thread overview]
Message-ID: <Y/0Zy0nUmorvrp1u@shell.armlinux.org.uk> (raw)
In-Reply-To: <c17bff4e-031e-4101-8564-51f6298b1c68@app.fastmail.com>

On Mon, Feb 27, 2023 at 09:38:54PM +0100, Arnd Bergmann wrote:
> On Mon, Feb 27, 2023, at 21:23, Larry Finger wrote:
> > On 2/27/23 07:34, Arnd Bergmann wrote:
> 
> >
> > Your patch set also breaks my PowerBook G4. The output of 'lspci -nn | grep 
> > Network' shows the following before your patch is applied:
> >
> > 0001:10:12.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4306 
> > 802.11b/g Wireless LAN Controller [14e4:4320] (rev 03)
> > 0001:11:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4318 
> > [AirForce One 54g] 802.11g Wireless LAN Controller [14e4:4318] (rev 02)
> >
> > The first of these is broken and built into the laptop. The second is plugged 
> > into a PCMCIA slot, and uses yenta-socket as a driver.
> >
> > When your patches are applied, the second entry vanishes.
> >
> > Yes, this hardware is ancient, but I would prefer having this wifi interface 
> > work. I can provide any output you need.
> 
> Is this the Cardbus or the PCMCIA version of the BCM4306 device? As far
> as I understand this particular chip can be wired up either way inside
> of the card, and the PowerBook G4 supports both types of devices.
> 
> If it's the PCMCIA version, then dropping support for it was the idea
> of the patch series that we can debate, but if it was the Cardbus version
> that broke, then this was likely a bug I introduced by accident.

If it shows up as a PCI device, it will be cardbus, not 16-bit ISA.

PCMCIA cards don't show up in lspci.

-- 
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