linux-kernel - Re: [PATCH v2] parport_pc: Also enable driver for PCI systems

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Date:   Wed, 16 Mar 2022 18:45:45 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] parport_pc: Also enable driver for PCI systems

On Wed, 2 Mar 2022, Sudip Mukherjee wrote:

> > Make the PARPORT_PC option selectable also for PCI systems then, except
> > for the s390 arch, however limit the availability of PARPORT_PC_SUPERIO
> > to platforms that enable ARCH_MIGHT_HAVE_PC_PARPORT.  Update platforms
> > accordingly for the required <asm/parport.h> header.
> >
> > Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
> 
> Acked-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
> 
> Usually parport patches goes via Greg's tree. Adding Greg.

 Thank you.  I have since been able to move my parport card to my RISC-V 
machine, and the result is as follows:

parport_pc 0000:07:00.0: enabling device (0000 -> 0001)
PCI parallel port detected: 1415:c118, I/O at 0x8(0x4), IRQ 38
parport0: PC-style at 0x8 (0x4), irq 38, using FIFO [PCSPP,TRISTATE,COMPAT,EPP,ECP]
lp0: using parport0 (interrupt-driven).

with the patch from:

<https://lore.kernel.org/lkml/alpine.DEB.2.21.2202260044180.25061@angie.orcam.me.uk/>

also applied so as to prevent I/O port 0 from being assigned by PCI code 
that wouldn't actually work (so allocation for the two BARs is at 0x4 and 
0x8 instead).

  Maciej