Hi Tejun I read the whole AHCI but I still could not find out what is the magic number 0x92. Is this in some Intel doc? Ming On Wed, 2006-05-24 at 17:09 -0400, Ming Zhang wrote: > 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
