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[PATCH] libata: improve ata_bus_probe()

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Improve ata_bus_probe() such that configuration failures are handled
better.  Each device is given ATA_PROBE_MAX_TRIES chances, but any
non-transient error (revalidation failure with -ENODEV, configuration
failure with -EINVAL...) disables the device directly.  Any IO error
results in SATA PHY speed down and ata_set_mode() failure lowers
transfer mode.  The last try always puts a device into PIO-0.

After each failure, the whole port is reset to make sure that the
controller and all the devices are in a known and stable state.  The
reset also applies SATA SPD configuration if necessary.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-04-02 17:54:46 +09:00 • committed by Jeff Garzik
parent cf176e1aa9
commit 14d2bac187
2 changed files with 52 additions and 16 deletions
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3
include/linux/libata.h
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@ -211,6 +211,9 @@ enum {
/* Masks for port functions */
ATA_PORT_PRIMARY = (1 << 0),
ATA_PORT_SECONDARY = (1 << 1),
/* how hard are we gonna try to probe/recover devices */
ATA_PROBE_MAX_TRIES = 3,
};
enum hsm_task_states {