• Tejun Heo's avatar
    libata: implement ata_wait_after_reset() · 88ff6eaf
    Tejun Heo authored
    On certain device/controller combination, 0xff status is asserted
    after reset and doesn't get cleared during 150ms post-reset wait.  As
    0xff status is interpreted as no device (for good reasons), this can
    lead to misdetection on such cases.
    This patch implements ata_wait_after_reset() which replaces the 150ms
    sleep and waits upto ATA_TMOUT_FF_WAIT if status is 0xff.
    ATA_TMOUT_FF_WAIT is currently 800ms which is enough for
    HHD424020F7SV00 to get detected but not enough for Quantum GoVault
    drive which is known to take upto 2s.
    Without parallel probing, spending 2s on 0xff port would incur too
    much delay on ata_piix's which use 0xff to indicate empty port and
    doesn't have SCR register, so GoVault needs to wait till parallel
    Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
ahci.c 58.8 KB