On 11/30/2010 05:02 AM, Lin Mac wrote: > Hi, > > I found that if I enabled CONFIG_SATA_PMP while not using multiplier > and connect the disks directly to the board, the disk cannot be found > due to software reset always failed. > > With arm/cns3xxx > linux-2.6.37-rc3 > ahci-platform driver > > # modprobe ahci-platform > [ 12.790000] ahci ahci.0: forcing PORTS_IMPL to 0x3 > [ 12.800000] ahci ahci.0: AHCI 0001.0100 32 slots 2 ports 3 Gbps 0x3 > impl platform mode > [ 12.810000] ahci ahci.0: flags: ncq sntf pm led clo only pmp pio > slum part ccc > [ 12.850000] scsi0 : ahci_platform > [ 12.860000] scsi1 : ahci_platform > [ 12.870000] ata1: SATA max UDMA/133 irq_stat 0x00400040, connection > status changed irq 65 > [ 12.880000] ata2: SATA max UDMA/133 mmio [mem > 0x83000000-0x83ffffff] port 0x180 irq 65 > [ 13.240000] ata2: SATA link down (SStatus 0 SControl 300) > [ 18.900000] ata1: link is slow to respond, please be patient (ready=0) > [ 22.930000] ata1: softreset failed (device not ready) > [ 28.940000] ata1: link is slow to respond, please be patient (ready=0) > [ 32.970000] ata1: softreset failed (device not ready) > [ 38.980000] ata1: link is slow to respond, please be patient (ready=0) > [ 68.030000] ata1: softreset failed (device not ready) > [ 68.040000] ata1: limiting SATA link speed to 1.5 Gbps > [ 70.280000] ata1: SATA link down (SStatus 1 SControl 310) > > With some debug, ahci_check_ready always get PORT_TFDATA(20)=0x1d0 > > While using multiplier with CONFIG_SATA_PMP enabled, or using disks > directly without CONFIG_SATA_PMP have no issue. > After some googling, it seems common and the only fix is to disable > CONFIG_SATA_PMP. > So, before I keep on going, I would like to know whether this is a > limitation, or a bug? Most likely a quirk in the controller. Maybe we should disable PMP support for it? -- tejun -- To unsubscribe from this list: 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
