[libata] check for SATA async notify support
Check to see if an ATAPI device supports Asynchronous Notification.
If so, enable it, if the host controller supports AN.
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index c0f3c78..9f87f7d 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -70,6 +70,7 @@
static unsigned int ata_dev_init_params(struct ata_device *dev,
u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
+static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable);
static void ata_dev_xfermask(struct ata_device *dev);
static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
@@ -1987,6 +1988,22 @@
}
dev->cdb_len = (unsigned int) rc;
+ /*
+ * check to see if this ATAPI device supports
+ * Asynchronous Notification
+ */
+ if ((ap->flags & ATA_FLAG_AN) && ata_id_has_AN(id)) {
+ int err;
+ /* issue SET feature command to turn this on */
+ err = ata_dev_set_AN(dev, SETFEATURES_SATA_ENABLE);
+ if (err)
+ ata_dev_printk(dev, KERN_ERR,
+ "unable to set AN, err %x\n",
+ err);
+ else
+ dev->flags |= ATA_DFLAG_AN;
+ }
+
if (ata_id_cdb_intr(dev->id)) {
dev->flags |= ATA_DFLAG_CDB_INTR;
cdb_intr_string = ", CDB intr";
@@ -3975,6 +3992,42 @@
}
/**
+ * ata_dev_set_AN - Issue SET FEATURES - SATA FEATURES
+ * @dev: Device to which command will be sent
+ * @enable: Whether to enable or disable the feature
+ *
+ * Issue SET FEATURES - SATA FEATURES command to device @dev
+ * on port @ap with sector count set to indicate Asynchronous
+ * Notification feature
+ *
+ * LOCKING:
+ * PCI/etc. bus probe sem.
+ *
+ * RETURNS:
+ * 0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_dev_set_AN(struct ata_device *dev, u8 enable)
+{
+ struct ata_taskfile tf;
+ unsigned int err_mask;
+
+ /* set up set-features taskfile */
+ DPRINTK("set features - SATA features\n");
+
+ ata_tf_init(dev, &tf);
+ tf.command = ATA_CMD_SET_FEATURES;
+ tf.feature = enable;
+ tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.protocol = ATA_PROT_NODATA;
+ tf.nsect = SATA_AN;
+
+ err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
+
+ DPRINTK("EXIT, err_mask=%x\n", err_mask);
+ return err_mask;
+}
+
+/**
* ata_dev_init_params - Issue INIT DEV PARAMS command
* @dev: Device to which command will be sent
* @heads: Number of heads (taskfile parameter)