From 62ba2841f2a51848f7cb0499edae3f6803764f2c Mon Sep 17 00:00:00 2001
From: Tejun Heo <htejun@gmail.com>
Date: Sun, 26 Jun 2005 23:27:19 +0900
Subject: [PATCH] [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>
---
drivers/scsi/libata-core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index fd66f56fd612..cb535fa185b9 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -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 */
--
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