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

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Date:	Mon, 05 Jul 2010 18:28:56 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
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 03:20 AM, Jiri Slaby wrote:
> 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.

Well, you can see if Windows shows IRQ 10 or 11 for that device..
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