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

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Date:   Mon, 27 Feb 2023 21:57:24 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Arnd Bergmann <arnd@...db.de>, Arnd Bergmann <arnd@...nel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        linux-kernel@...r.kernel.org
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Ian Abbott <abbotti@....co.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        Kevin Cernekee <cernekee@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        Manuel Lauss <manuel.lauss@...il.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Olof Johansson <olof@...om.net>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        YOKOTA Hiroshi <yokota@...lab.is.tsukuba.ac.jp>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-can@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-wireless@...r.kernel.org, Netdev <netdev@...r.kernel.org>
Subject: Re: [RFC 0/6] pcmcia: separate 16-bit support from cardbus

On 2/27/23 15:30, Arnd Bergmann wrote:
> On Mon, Feb 27, 2023, at 22:09, Larry Finger wrote:
>> On 2/27/23 14:38, Arnd Bergmann wrote:
>>> 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.
>>
>> The BCM4306 is internal, and wired directly to the PCI bus. My understanding is
>> that the BCM4318 is a cardbus device. It definitely shows up in an lspci scan.
> 
> Ah right, I got confused because I had googled for BCM4306 for too long
> trying to find out whether that might be used in combination with the
> BCM63xx SoC support that patch 1 removed.
> 
> BCM4318 should definitely keep working after my series. My best guess
> is that the problem is that I introduced an unnecessary dependency
> between CONFIG_CARDBUS and CONFIG_PCI_HOTPLUG, so you'd need to
> either undo the dependency or enable both in the local config.
> 
> If it's not that, then it's a bug in my changes that needs to be
> fixed before they can be considered for integration. As long as
> we are still debating whether the series makes sense at all,
> I'm not worried about this.

Arnd,

It was a configuration problem. In the .config obtained by installing your 
patches, and doing a make, CONFIG_CARDBUS was not mentioned, and 
CONFIG_PCI_HOTPLUG was not selected. When I deleted the reference to the latter, 
did a make, and set ..._HOTPLUG, I got CONFIG+CARDBUS set to "m", and the yenta 
modules were built. This version sees the BCM4318 in the lspci scan, and the 
interface works. Your patches are OK.

I am not sure how to warn people about the configuration change possible 
breaking things.

Larry