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

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Message-ID: <4C447D6D.5060801@suse.cz>
Date:	Mon, 19 Jul 2010 18:29:33 +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 07/06/2010 02:28 AM, Robert Hancock wrote:
> 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..

But how can I find out which link it is routed to in Windows? Without
that information the number is meaningless, no?

thanks,
-- 
js
suse labs
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