On Wed, 2006-05-24 at 13:51 -0700, Tejun Heo wrote: > 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 the BIOS has a option to switch between AHCI and PIIX. So I guess the reason is as you said. also this is kernel boot log related to this. could u point out the place for this pcs in AHCI spec? i just printed AHCI and can not find related information about this PCS. the code operate at offset 0x92 but i can not find anything about that. libata version 1.30 loaded. ahci 0000:00:1f.2: version 1.3 ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 19 (level, low) -> IRQ 19 ahci 0000:00:1f.2: pcs 0x11->0x1f PCI: Setting latency timer of device 0000:00:1f.2 to 64 ahci 0000:00:1f.2: AHCI 0001.0100 32 slots 4 ports 3 Gbps 0x1 impl SATA mode ahci 0000:00:1f.2: flags: 64bit ncq pm led clo pio slum part ata1: SATA max UDMA/133 cmd 0xF881C500 ctl 0x0 bmdma 0x0 irq 19 ata2: SATA max UDMA/133 cmd 0xF881C580 ctl 0x0 bmdma 0x0 irq 19 ata3: SATA max UDMA/133 cmd 0xF881C600 ctl 0x0 bmdma 0x0 irq 19 ata4: SATA max UDMA/133 cmd 0xF881C680 ctl 0x0 bmdma 0x0 irq 19 scsi0 : ahci ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300) ata1.00: cfg 49:2f00 82:74eb 83:7feb 84:4123 85:74e9 86:3c03 87:4123 88:007f ata1.00: ATA-7, max UDMA/133, 781422768 sectors: LBA48 ata1.00: configured for UDMA/133 scsi1 : ahci ata2: SATA link down (SStatus 0 SControl 0) scsi2 : ahci ata3: SATA link down (SStatus 0 SControl 0) scsi3 : ahci ata4: SATA link down (SStatus 0 SControl 0) Vendor: ATA Model: HDS724040KLSA80 Rev: KFAO Type: Direct-Access ANSI SCSI revision: 05 SCSI device sda: 781422768 512-byte hdwr sectors (400088 MB) sda: Write Protect is off sda: Mode Sense: 00 3a 00 00 SCSI device sda: drive cache: write back SCSI device sda: 781422768 512-byte hdwr sectors (400088 MB) sda: Write Protect is off sda: Mode Sense: 00 3a 00 00 SCSI device sda: drive cache: write back sda: sd 0:0:0:0: Attached scsi disk sda sd 0:0:0:0: Attached scsi generic sg0 type 0 > 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) > > plain text document attachment (patch) > 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; - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
