linux-kernel - Re: [PATCH 1/1] ACPI: pci_irq, add PRT

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Message-ID: <4C2B0C73.9050200@suse.cz>
Date:	Wed, 30 Jun 2010 11:20:51 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, lenb@...nel.org,
	linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH 1/1] ACPI: pci_irq, add PRT_ quirk for IBM Bartolo

On 06/30/2010 01:23 AM, Robert Hancock wrote:
> What kind of slot is it, and what kind of device was being used,
> something designed for this machine or just some random card?

It's a netmos 9835 serial card with 2 ports. PCI, there is no PCIe in
the machine as far as I can see.

> Can they
> tell what IRQ the device is reportedly using in Windows and if it
> matches what Linux reports?

I can ask them. What I know is that with acpi=noirq (or with the quirk)
the IRQ number is 10, with acpi without the quirk, it's 11:

PCI: setting IRQ 2 as level-triggered
serial 0000:00:09.0: found PCI INT A -> IRQ 2
0000:00:09.0: ttyS4 at I/O 0x1898 (irq = 10) is a 16550A
0000:00:09.0: ttyS5 at I/O 0x1890 (irq = 10) is a 16550A

ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 11
PCI: setting IRQ 11 as level-triggered
serial 0000:00:09.0: PCI INT A -> Link[LNKB] -> GSI 11 (level, low) ->
IRQ 11
0000:00:09.0: ttyS4 at I/O 0x1898 (irq = 11) is a 16550A
0000:00:09.0: ttyS5 at I/O 0x1890 (irq = 11) is a 16550A

I still no point in comparing this to Windows' setup. We can't find out
whether it is quirked or better (without some bug) handled there.

regards,
-- 
js
suse labs
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