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authorGabriele Mazzotta <gabriele.mzt@gmail.com>2015-04-25 19:52:36 +0200
committerSasha Levin <sasha.levin@oracle.com>2015-06-10 13:42:26 -0400
commitf62eb4c05075de5353c7bb1d1ea6c795a24abe51 (patch)
treec6dc42ebcd5422f614549ea98cf38d87095d33ea
parentf91f6d2d91ba8d57affcc0ac1cbfc256a5f919fd (diff)
downloadlinux-linaro-stable-f62eb4c05075de5353c7bb1d1ea6c795a24abe51.tar.gz
libata: Add helper to determine when PHY events should be ignored
[ Upstream commit 8393b811f38acdf7fd8da2028708edad3e68ce1f ] This is a preparation commit that will allow to add other criteria according to which PHY events should be dropped. Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
-rw-r--r--drivers/ata/libahci.c3
-rw-r--r--drivers/ata/libata-core.c19
-rw-r--r--include/linux/libata.h1
3 files changed, 21 insertions, 2 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 97683e45ab04..de88999521b7 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1707,8 +1707,7 @@ static void ahci_handle_port_interrupt(struct ata_port *ap,
if (unlikely(resetting))
status &= ~PORT_IRQ_BAD_PMP;
- /* if LPM is enabled, PHYRDY doesn't mean anything */
- if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
+ if (sata_lpm_ignore_phy_events(&ap->link)) {
status &= ~PORT_IRQ_PHYRDY;
ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
}
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 485f7eab0d4b..6a73f6b99be0 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6747,6 +6747,25 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
return tmp;
}
+/**
+ * sata_lpm_ignore_phy_events - test if PHY event should be ignored
+ * @link: Link receiving the event
+ *
+ * Test whether the received PHY event has to be ignored or not.
+ *
+ * LOCKING:
+ * None:
+ *
+ * RETURNS:
+ * True if the event has to be ignored.
+ */
+bool sata_lpm_ignore_phy_events(struct ata_link *link)
+{
+ /* if LPM is enabled, PHYRDY doesn't mean anything */
+ return !!(link->lpm_policy > ATA_LPM_MAX_POWER);
+}
+EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
+
/*
* Dummy port_ops
*/
diff --git a/include/linux/libata.h b/include/linux/libata.h
index fe0bf8dc83bb..cc1d458a0595 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1199,6 +1199,7 @@ extern struct ata_device *ata_dev_pair(struct ata_device *adev);
extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
extern void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap);
extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap, struct list_head *eh_q);
+extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
extern int ata_cable_40wire(struct ata_port *ap);
extern int ata_cable_80wire(struct ata_port *ap);