Add dev->__acpi_init_gtm and store initial GTM values on host
initialization. If the field is valid, ata_acpi_init_gtm() returns
pointer to the saved GTM structure; otherwise, NULL. This is to
remember BIOS/firmware programmed initial timing for later use before
reset and mode configuration modify it. The accessor is there to make
building w/o ACPI easy dev->__acpi_init doesn't exist if ACPI is not
enabled.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/ata/libata-acpi.c | 3 +++
include/linux/libata.h | 14 +++++++++++++-
2 files changed, 16 insertions(+), 1 deletions(-)
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index ba6b61c..357f9a2 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -94,6 +94,9 @@ static void ata_acpi_associate_ide_port(struct ata_port *ap)
dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
}
+
+ if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
+ ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
}
static void ata_acpi_handle_hotplug(struct ata_port *ap, struct kobject *kobj,
diff --git a/include/linux/libata.h b/include/linux/libata.h
index a7b999a..f056b2c 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -213,6 +213,7 @@ enum {
ATA_PFLAG_SUSPENDED = (1 << 17), /* port is suspended (power) */
ATA_PFLAG_PM_PENDING = (1 << 18), /* PM operation pending */
ATA_PFLAG_GTM_VALID = (1 << 19), /* acpi_gtm data valid */
+ ATA_PFLAG_INIT_GTM_VALID = (1 << 20), /* initial gtm data valid */
/* struct ata_queued_cmd flags */
ATA_QCFLAG_ACTIVE = (1 << 0), /* cmd not yet ack'd to scsi lyer */
@@ -662,6 +663,7 @@ struct ata_port {
#ifdef CONFIG_ATA_ACPI
acpi_handle acpi_handle;
struct ata_acpi_gtm acpi_gtm;
+ struct ata_acpi_gtm __acpi_init_gtm; /* use ata_acpi_init_gtm() */
#endif
u8 sector_buf[ATA_SECT_SIZE]; /* owned by EH */
};
@@ -958,13 +960,23 @@ enum {
/* libata-acpi.c */
#ifdef CONFIG_ATA_ACPI
+static inline const struct ata_acpi_gtm *ata_acpi_init_gtm(struct ata_port *ap)
+{
+ if (ap->pflags & ATA_PFLAG_INIT_GTM_VALID)
+ return &ap->__acpi_init_gtm;
+ return NULL;
+}
extern int ata_acpi_cbl_80wire(struct ata_port *ap);
int ata_acpi_stm(const struct ata_port *ap, struct ata_acpi_gtm *stm);
int ata_acpi_gtm(const struct ata_port *ap, struct ata_acpi_gtm *stm);
unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
const struct ata_acpi_gtm *gtm);
-
#else
+static inline const struct ata_acpi_gtm *ata_acpi_init_gtm(struct ata_port *ap)
+{
+ return NULL;
+}
+
static inline int ata_acpi_cbl_80wire(struct ata_port *ap) { return 0; }
static inline int ata_acpi_stm(const struct ata_port *ap,
--
1.5.2.4
-
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