• Arnd Hannemann's avatar
    pata_atiixp: override cable detection on MSI E350DM-E33 · 1117c811
    Arnd Hannemann authored
    The mainboard MSI E350DM-E33 is advertised with 6 SATA ports.
    As it turns out, two of them seem to be driven by on-board
    SATA<->PATA converters. If a disk drive is connected to one
    of them kernel uses UDMA/33 mode due to cable detection:
    
    [   34.550823] scsi4 : pata_atiixp
    [   34.555517] scsi5 : pata_atiixp
    [   34.555942] ata5: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xf100 irq 14
    [   34.555948] ata6: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xf108 irq 15
    ...
    [   35.040799] ata5.00: ATA-8: WDC WD20EADS-00R6B0, 01.00A01, max UDMA/133
    [   35.040806] ata5.00: 3907029168 sectors, multi 16: LBA48 NCQ (depth 0/32)
    [   35.040817] ata5.00: limited to UDMA/33 due to 40-wire cable
    [   35.049166] ata5.00: configured for UDMA/33
    [   35.049402] scsi 4:0:0:0: Direct-Access     ATA      WDC WD20EADS-00R 01.0 PQ: 0 ANSI: 5
    
    This patch forces "short cable" mode on this board, as it seems clear that
    the on-board SATA<->PATA "cable" is short.
    With this patch the disk is configured for UDMA/100:
    
    [    5.976756] ata5.00: ATA-8: WDC WD20EADS-00R6B0, 01.00A01, max UDMA/133
    [    5.996434] ata5.00: 3907029168 sectors, multi 16: LBA48 NCQ (depth 0/32)
    [    6.024787] ata5.00: configured for UDMA/100
    
    Testing revealed no transfer issues.
    Signed-off-by: 's avatarArnd Hannemann <arnd@arndnet.de>
    Signed-off-by: 's avatarJeff Garzik <jgarzik@redhat.com>
    1117c811
pata_atiixp.c 8.52 KB