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ahci: fix notification handling 

Asynchronous notification on ICH9 didn't work because it didn't write
AN FIS into the RX area - it only updates SNotification.  Also,
snooping SDB_FIS RX area is racy against further SDB FIS receptions.
Let sata_async_notification() determine using SNTF if it's available
and snoop RX area iff SNTF isn't available

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-10-09 15:02:23 +09:00 committed by Jeff Garzik
parent 1c954a4d9a
commit 5f226c6bf7
1 changed files with 21 additions and 9 deletions
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30
drivers/ata/ahci.c
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@ -1420,6 +1420,7 @@ static void ahci_port_intr(struct ata_port *ap)
void __iomem *port_mmio = ap->ioaddr.cmd_addr;
struct ata_eh_info *ehi = &ap->link.eh_info;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_host_priv *hpriv = ap->host->private_data;
u32 status, qc_active;
int rc, known_irq = 0;
@ -1432,17 +1433,28 @@ static void ahci_port_intr(struct ata_port *ap)
}
if (status & PORT_IRQ_SDB_FIS) {
/* If the 'N' bit in word 0 of the FIS is set, we just
* received asynchronous notification. Tell libata
* about it. Note that as the SDB FIS itself is
* accessible, SNotification can be emulated by the
* driver but don't bother for the time being.
/* If SNotification is available, leave notification
* handling to sata_async_notification(). If not,
* emulate it by snooping SDB FIS RX area.
*
* Snooping FIS RX area is probably cheaper than
* poking SNotification but some constrollers which
* implement SNotification, ICH9 for example, don't
* store AN SDB FIS into receive area.
*/
const __le32 *f = pp->rx_fis + RX_FIS_SDB;
u32 f0 = le32_to_cpu(f[0]);
if (f0 & (1 << 15))
if (hpriv->cap & HOST_CAP_SNTF)
sata_async_notification(ap);
else {
/* If the 'N' bit in word 0 of the FIS is set,
* we just received asynchronous notification.
* Tell libata about it.
*/
const __le32 *f = pp->rx_fis + RX_FIS_SDB;
u32 f0 = le32_to_cpu(f[0]);
if (f0 & (1 << 15))
sata_async_notification(ap);
}
}
/* pp->active_link is valid iff any command is in flight */