libata: implement PMP helpers

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b2d5d63fb6c9..3401248180c9 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -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