libata: expose pm qos flags for ata device

Expose pm qos flags to user space so that user has a chance to disable
ZPODD feature, if he/she has a broken platform or devices or simply does
not like this feature.

This flag is exposed to user space only for ZPODD devices.

Due to this flag, it is possible the ODD is ZP ready but we didn't power
it off. So the zp_ready flag will need to be cleared whenever we found
the ODD is not in ZP ready state. Previously, once zp_ready is set, the
ODD will always be powered off and the flag will be cleared in
post_poweron. But this is no longer the case now.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 6f72c648ea141e5ea0655698ddbd00ee4132a419..97094496127e8172a0041442a8b502e7b0694b9f 100644 (file)
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -17,6 +17,7 @@
 #include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_qos.h>
 #include <scsi/scsi_device.h>
 #include "libata.h"
 
@@ -1022,6 +1023,8 @@ static void ata_acpi_unregister_power_resource(struct ata_device *dev)
 void ata_acpi_bind(struct ata_device *dev)
 {
        ata_acpi_register_power_resource(dev);
+       if (zpodd_dev_enabled(dev))
+               dev_pm_qos_expose_flags(&dev->sdev->sdev_gendev, 0);
 }
 
 void ata_acpi_unbind(struct ata_device *dev)

diff --git a/drivers/ata/libata-zpodd.c b/drivers/ata/libata-zpodd.c
index 1f5d52ae3974dcce14d09accbaea0100988773e3..540b0b7904fb16da2094aed65626bf2b14a6fdfe 100644 (file)
--- a/drivers/ata/libata-zpodd.c
+++ b/drivers/ata/libata-zpodd.c
@@ -150,6 +150,7 @@ void zpodd_on_suspend(struct ata_device *dev)
 
        if (!zpready(dev)) {
                zpodd->zp_sampled = false;
+               zpodd->zp_ready = false;
                return;
        }