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>

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 82632e7..05ff8c7 100644 (file)
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -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;
 }