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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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4
drivers/ata/libata-core.c
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@@ -2278,7 +2278,7 @@ int ata_dev_configure(struct ata_device *dev)
* changed notifications and ATAPI ANs.
*/
if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
(!ap->nr_pmp_links ||
(!sata_pmp_attached(ap) ||
sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
unsigned int err_mask;
@@ -3623,7 +3623,7 @@ int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
if (online)
*online = true;
if ((link->ap->flags & ATA_FLAG_PMP) && ata_is_host_link(link)) {
if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
/* If PMP is supported, we have to do follow-up SRST.
* Some PMPs don't send D2H Reg FIS after hardreset if
* the first port is empty. Wait only for