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libata-acpi: allow _GTF on SATA, but disable on PATA for now

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The ACPI specification states, and BIOS implementations depend on,
_STM being called before _GTF.

SATA does this, but PATA does not.  So for now, simply
prevent execution of _GTF on PATA devices.  Longer term we
should implement ACPI support for PATA devices in libata.

Signed-off-by: Kristen Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Kristen Accardi 2007-03-09 18:15:33 -05:00 committed by Len Brown
parent 908e0a8a26
commit df33c77e39
1 changed files with 7 additions and 0 deletions
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7
drivers/ata/libata-acpi.c
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@ -561,6 +561,13 @@ int ata_acpi_exec_tfs(struct ata_port *ap)
if (noacpi)
return 0;
/*
* TBD - implement PATA support. For now,
* we should not run GTF on PATA devices since some
* PATA require execution of GTM/STM before GTF.
*/
if (!(ap->cbl == ATA_CBL_SATA))
return 0;
for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
if (!ata_dev_enabled(&ap->device[ix]))