Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME

       ata_bus_reset - reset host port and associated ATA channel

SYNOPSIS

       void ata_bus_reset  (struct ata_port * ap);

ARGUMENTS

       ap     port to reset

DESCRIPTION

       This  is typically the first time we actually start issuing commands to
       the ATA channel. We wait for BSY to clear, then  issue  EXECUTE  DEVICE
       DIAGNOSTIC  command, polling for its result. Determine what devices, if
       any, are on the channel by looking at the device  0/1  error  register.
       Look  at  the  signature stored in each device’s taskfile registers, to
       determine if the device is ATA or ATAPI.

LOCKING

       PCI/etc. bus probe sem. Obtains host_set lock.

SIDE EFFECTS

       Sets ATA_FLAG_PORT_DISABLED if bus reset fails.

AUTHOR

       Jeff Garzik.