• Mikulas Patocka's avatar
    ide: Serialize CMD643 and CMD646 to fix a hardware bug with SSD · 9bd7496f
    Mikulas Patocka authored
    CMD646 corrupts data on concurrent transfers on both channels when IDE SSD is
    connected to one of the channels.
    
    Setup that demonstrates this hardware bug: Ultra 5, onboard CMD646, rev 3.
    /dev/hda is 8GB Seagate ST38410A in MWDMA2
    /dev/hdd is 32GB SSD SiliconHardDisk in MWDMA2
    
    - When reading /dev/hdd (for example with dd or fsck), reads from /dev/hda
      are corrupted, there are twiddled single bits 1->0 and some full 32-bit
      words corrupted, sometimes commands fail (which switches /dev/hda to
      PIO mode but the corruptions happen even in PIO).
    - Reads from /dev/hdd don't seem to be corrupted (i.e. fsck passes fine).
    - When I connected normal rotating harddisk to /dev/hdd, there was no
      corruption, so the corruption is something specific to SSD.
    - I tried the same setup on a PCI card with CMD649 and saw no corruption.
    
    This patch serializes the operation for CMD646 and 643 (I didn't test
    CMD643 but it may have the same hw bug too because it's earlier design).
    CMD649 is good. I don't know anything about CMD 648.
    Signed-off-by: 's avatarMikulas Patocka <mpatocka@redhat.com>
    Tested-by: 's avatarFrans Pop <elendil@planet.nl>
    Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
    9bd7496f
cmd64x.c 13.3 KB