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[PATCH] libata: lengthen COMMRESET delay 

This patch lengthens the delay between DET setting and clearing for
COMMRESET from 400us to 1ms.  I couldn't find any requiremen regarding
the duration of COMMRESET in SATA I/II specs but AHCI-1.1 10.4.2
states that it should be at least 1ms.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2005-06-26 23:27:19 +09:00 committed by Jeff Garzik
parent e922256ae4
commit 62ba2841f2
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/libata-core.c
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@ -1408,7 +1408,9 @@ void __sata_phy_reset(struct ata_port *ap)
if (ap->flags & ATA_FLAG_SATA_RESET) {
/* issue phy wake/reset */
scr_write_flush(ap, SCR_CONTROL, 0x301);
udelay(400); /* FIXME: a guess */
/* Couldn't find anything in SATA I/II specs, but
* AHCI-1.1 10.4.2 says at least 1 ms. */
mdelay(1);
}
scr_write_flush(ap, SCR_CONTROL, 0x300); /* phy wake/clear reset */