Ming Zhang wrote:
Hi All
I use the libata patch from
http://home-tj.org/wiki/index.php/Libata-tj-stable with my supermicro MB
( ICH7R chip). The AHCI works as desired in most of the time.
If I have disk(s) plugged in during boot. Then after boot, I kept unplug
and plug many times and it works fine.
but i noticed that if I have the disk(s) unplugged during boot, then
after boot, I plug the disk and nothing shows. if I try to do rescan by
run the rescan lun script, i saw these from dmesg.
Anything clue ? Thanks!
Ming
---------------------------------------
ata4: soft resetting port
ata4: SATA link down (SStatus 0 SControl 0)
ata4: EH complete
ata3: soft resetting port
ata3: SATA link down (SStatus 0 SControl 0)
ata3: EH complete
ata4: soft resetting port
ata4: SATA link down (SStatus 0 SControl 0)
ata4: EH complete
ata3: soft resetting port
ata3: SATA link down (SStatus 0 SControl 0)
ata3: EH complete
ata4: soft resetting port
ata4: SATA link down (SStatus 0 SControl 0)
ata4: EH complete
Hello,
That never happened to me on AHCI mode but I experienced similar thing
with piix mode. It might be that your BIOS doesn't turn on PCS enable
bits for empty ports and thus the empty ports cannot be used after boot.
Can you try the attached patch? (only compile-tested, be cautious)
--
tejun
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 45fd71d..83751dd 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -1306,6 +1306,15 @@ static int ahci_init_one (struct pci_dev
have_msi = 0;
}
+ {
+ u8 orig_pcs, pcs;
+ pci_read_config_byte(pdev, 0x92, &orig_pcs);
+ pci_write_config_byte(pdev, 0x92, 0xf);
+ pci_read_config_byte(pdev, 0x92, &pcs);
+ dev_printk(KERN_INFO, &pdev->dev, "pcs 0x%x->0x%x\n",
+ orig_pcs, pcs);
+ }
+
probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
if (probe_ent == NULL) {
rc = -ENOMEM;
