Re: [PATCH 2.6.32] MCP5x conditional MSI support for sata_nv

[Robert Hancock <hancockrwd@gmail.com>]

On 08/04/2009 08:35 PM, Philip Langdale wrote:
> On Wed,  5 Aug 2009 00:32:34 +0100 (BST)
> Tony Vroon<tony@linx.net>  wrote:
>
>> The nVidia MCP55 controller quite happily supports MSI.
>> This adds an option to use it. It is disabled by default and
>> will only be honoured on MCP5x series controllers.
>> This was suggested in 2007 back when the driver was less mature,
>> perhaps now is a better time for it.
>
> I don't use an MCP55 motherboard anymore but I ran with MSI on for
> multiple years to no ill effect. However, in this thread where I
> reported my success, another person reported failure with MCP51.
>
> http://www.nvnews.net/vbulletin/showthread.php?t=101144&highlight=sata_nv+msi
>
> Assuming that's true, you can't use the 'MCP5x' test as that will
> cover MCP51 as well.

I'd take that with a bit of a grain of salt as there have been a lot of 
HT MSI fixups included since those posts (2007). Some motherboards 
didn't enable HT MSI mapping capabilities by default, which would 
prevent MSI from working.