linux-kernel - Re: [PATCH] Unbreak MSI on ATI devices

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Date:	Fri, 05 Jan 2007 01:07:01 -0800
From:	Petr Vandrovec <petr@...drovec.name>
To:	Roland Dreier <rdreier@...co.com>
CC:	jeff@...zik.org, linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: [PATCH] Unbreak MSI on ATI devices

Roland Dreier wrote:
>  > So my question is - what is real reason for disabling INTX when in MSI mode?
>  > According to PCI spec it should not be needed, and it hurts at least chips
>  > listed below:
>  > 
>  > 00:13.0 0c03: 1002:4374 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller
>  > 00:13.1 0c03: 1002:4375 USB Controller: ATI Technologies Inc IXP SB400 USB Host Controller
>  > 00:13.2 0c03: 1002:4373 USB Controller: ATI Technologies Inc IXP SB400 USB2 Host Controller 
> 
> heh... I'm not gloating or anything... but I am glad that some ASIC
> designer was careless enough to prove me right when I said going
> beyond what the PCI spec requires is dangerous.

Hi,
   unfortunately it is not everything :-(

I cannot get MSI to work on IDE interface under any circumstances - in 
legacy mode it always uses IRQ14/15 regardless of whether MSI is enabled 
or not (that's probably correct), but in native mode as soon as I enable 
MSI it either does not deliver interrupts at all (definitely not through 
IRQ14/15, and, if I got routing right, also not through its INTA#), or 
it delivers them somewhere else than where programmed.  As my boot 
device is connected to this adapter, and it is a notebook, it is not 
easy to debug what's really going on :-(

00:14.1 0101: 1002:4376  IDE interface: ATI Technologies Inc Standard 
Dual Channel PCI IDE Controller ATI  (prog-if 8f [Master SecP SecO PriP 
PriO])
         Subsystem: Rioworks Unknown device 2043
         Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 18
         I/O ports at 01f0 [size=8]
         I/O ports at 03f4 [size=4]
         I/O ports at 0170 [size=8]
         I/O ports at 0374 [size=4]
         I/O ports at 8410 [size=16]
         Capabilities: [70] Message Signalled Interrupts: Mask- 64bit- 
Queue=0/0 Enable-


							Petr
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