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libata: implement PMP helpers

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Implement helpers to test whether PMP is supported, attached and
determine pmp number to use when issuing SRST to a link.  While at it,
move ata_is_host_link() so that it's together with the two new PMP
helpers.

This change simplifies LLDs and helps making PMP support optional.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo
2008-04-07 22:47:22 +09:00
committed by Jeff Garzik
parent 48515f6c00
commit 071f44b1d2
8 changed files with 58 additions and 69 deletions
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2
drivers/ata/libata-acpi.c
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@@ -77,7 +77,7 @@ void ata_acpi_associate_sata_port(struct ata_port *ap)
{
WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA));
if (!ap->nr_pmp_links) {
if (!sata_pmp_attached(ap)) {
acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
ap->link.device->acpi_handle =