On Wed, 26 Jul 2006 15:35:45 +0800 zhao, forrest wrote:

Hello, all

In ACPI spec 3.0, section 9.9 defines 4 objects for PATA/SATA:

_GTF is for both PATA and SATA, which is used to return ATA task file
needed to re-init the drive;
_SDD is SATA-only object, which is used to inform the platform of the
type of device attached to a port;
_GTM and _STM are PATA-only objects, which are used to get/set PATA
timing information(i.e. PIO and DMA speed).

In this patch set, 
ata_acpi_exec_tfs() is for getting ATA task file from _GTF and executing
them for a given drive;
ata_acpi_push_id() is for setting _SDD.


NOTE: this patch doesn't include the support for _GTM and _STM because
libata defines ->set_piomode(), ->set_dmamode() callbacks for LLDD,
which do the same work as _GTM and _STM. So I think it's not necessary
to provide redundant functionality by _GTM and _STM.

Do LLDDs use set_piomode() and set_dmamode() to save those modes
before suspend and restore them on resume?

Thanks,
---
~Randy