[coreboot-gerrit] Change in coreboot[master]: [WIP] sb,soc/amd: Move common OSFL method in ASL

[Kyösti Mälkki (Code Review)]

Attention is currently required from: Raul Rangel, Michał Żygowski, Marshall Dawson, Paul Menzel, Alexander Couzens, Patrick Rudolph, Felix Held, Piotr Król.
Kyösti Mälkki has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50592 )

Change subject: [WIP] sb,soc/amd: Move common OSFL method in ASL
......................................................................

Patch Set 2:

(1 comment)

File src/southbridge/amd/agesa/hudson/acpi/audio.asl:

https://review.coreboot.org/c/coreboot/+/50592/comment/97555fe8_61631f51 
PS2, Line 37: 			NSDI = 1
Bits default to 0. So the change seems to disable some use of No Snoop DMA attributes.

18 NSEN EnableNoSnoopRequest.

1=Enable No Snoop request to ACPI.
  0=Disable.

No snoop request to ACPI When enabled and the DMA cycle is No Snoop, ACPI will
  not generate a wake to CPU in C2 state.

17 NSDO DisableNoSnoopOverride.

1=DisableNoSnoop controlling the No Snoop attribute.
  0=Override DisableNoSnoop setting and always generate No Snoop attribute on
    Buffer Descriptor and Data Buffer DMA.

16 NSDI DisableNoSnoop.

1=No Snoop attribute is disabled on Buffer Descriptor and Data Buffer DMA.
  0=Set the No Snoop attribute on Buffer Descriptor and Data Buffer DMA when
    the Traffic Priority bit is set in the Stream Descriptor.