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authorAaron Lu <aaron.lu@intel.com>2013-01-15 17:21:00 +0800
committerJeff Garzik <jgarzik@redhat.com>2013-01-21 15:41:34 -0500
commit3dc67440d99b2c718ef5f1eb1424a9066ffa3fb9 (patch)
tree4eee59932d2b99daf76f2bca624c05e719a4b004 /drivers/ata/libata.h
parentf064a20dded807448669426c9bfb7d03aba5659c (diff)
downloadlinux-3dc67440d99b2c718ef5f1eb1424a9066ffa3fb9.tar.bz2
libata: check zero power ready status for ZPODD
Per the Mount Fuji spec, the ODD is considered zero power ready when: - For slot type ODD, no media inside; - For tray type ODD, no media inside and tray closed. The information can be retrieved by either the returned information of command GET_EVENT_STATUS_NOTIFICATION(the command is used to poll for media event) or sense code. The information provided by the media status byte is not accurate, it is possible that after a new disc is just inserted, the status byte still returns media not present. So this information can not be used as the deciding factor, we use sense code to decide if zpready status is true. When we first sensed the ODD in the zero power ready state, the zp_sampled will be set and timestamp will be recoreded. And after ODD stayed in this state for some pre-defined period, the ODD is considered as power off ready and the zp_ready flag will be set. The zp_ready flag serves as the deciding factor other code will use to see if power off is OK for the ODD. The Mount Fuji spec suggests a delay should be used here, to avoid the case user ejects the ODD and then instantly inserts a new one again, so that we can avoid a power transition. And some ODDs may be slow to place its head to the home position after disc is ejected, so a delay here is generally a good idea. And the delay time can be changed via the module param zpodd_poweroff_delay. The zero power ready status check is performed in the ata port's runtime suspend code path, when port is not frozen yet, as we need to issue some IOs to the ODD. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata.h')
-rw-r--r--drivers/ata/libata.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index a21740b4ee11..b9b2bb1d5dc6 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -182,6 +182,9 @@ extern void ata_eh_finish(struct ata_port *ap);
extern int ata_ering_map(struct ata_ering *ering,
int (*map_fn)(struct ata_ering_entry *, void *),
void *arg);
+extern unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key);
+extern unsigned int atapi_eh_request_sense(struct ata_device *dev,
+ u8 *sense_buf, u8 dfl_sense_key);
/* libata-pmp.c */
#ifdef CONFIG_SATA_PMP
@@ -238,10 +241,12 @@ static inline bool zpodd_dev_enabled(struct ata_device *dev)
{
return dev->zpodd != NULL;
}
+void zpodd_on_suspend(struct ata_device *dev);
#else /* CONFIG_SATA_ZPODD */
static inline void zpodd_init(struct ata_device *dev) {}
static inline void zpodd_exit(struct ata_device *dev) {}
static inline bool zpodd_dev_enabled(struct ata_device *dev) { return false; }
+static inline void zpodd_on_suspend(struct ata_device *dev) {}
#endif /* CONFIG_SATA_ZPODD */
#endif /* __LIBATA_H__ */