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sata_mv add temporary 3 second init delay for SiliconImage PMs 

sata_mv does not yet fully support hotplug (coming soon, though).
This means that the driver may not find a Silicon Image port-multiplier
when first loaded, because those devices take in exceess of 3 seconds
to sync up the SATA PHY (most devices do this in mere microseconds).

So, as a short-term interim measure, here we insert a 3-second pause
on initial driver load, once per controller board (not once per port!),
to allow the Silicon Image port-multipliers to be detected later.

This will be removed again (soon!) once hotplug is fully implemented/working.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Mark Lord 2008-04-16 15:01:19 -04:00 committed by Jeff Garzik
parent 8a74f1a468
commit 094e50b2f7
1 changed files with 7 additions and 0 deletions
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7
drivers/ata/sata_mv.c
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@ -2105,6 +2105,13 @@ static int mv6_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
printk(KERN_ERR DRV_NAME ": can't clear global reset\n");
rc = 1;
}
/*
* Temporary: wait 3 seconds before port-probing can happen,
* so that we don't miss finding sleepy SilXXXX port-multipliers.
* This can go away once hotplug is fully/correctly implemented.
*/
if (rc == 0)
msleep(3000);
done:
return rc;
}