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Date: Fri, 21 Sep 2007 13:28:01 +0800
From: "Peer Chen" <peerchen@...il.com>
To: "linux-kernel" <linux-kernel@...r.kernel.org>
Cc: "jeff" <jeff@...zik.org>, "akpm" <akpm@...ux-foundation.org>,
"linux-ide" <linux-ide@...r.kernel.org>
Subject: [PATCH] ahci: enable GHC.AE bit before set GHC.HR
According to the description of section 5.2.2.1 and 10.1.2 of AHCI specification rev1_1/rev1_2, GHC.HR shall only be set to ¡®1¡¯
by software when GHC.AE is set to ¡®1¡¯.
Signed-off-by: Peer Chen <peerchen@...il.com>
---
--- linux-2.6.23-rc7/drivers/ata/ahci.c.orig 2007-09-20 11:01:55.000000000 -0400
+++ linux-2.6.23-rc7/drivers/ata/ahci.c 2007-09-20 11:07:31.000000000 -0400
@@ -834,6 +834,10 @@ static int ahci_reset_controller(struct
void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
u32 tmp;
+ /* turn on AHCI mode before controller reset*/
+ writel(HOST_AHCI_EN, mmio + HOST_CTL);
+ (void) readl(mmio + HOST_CTL); /* flush */
+
/* global controller reset */
tmp = readl(mmio + HOST_CTL);
if ((tmp & HOST_RESET) == 0) {
-
--------------
Peer Chen
2007-09-21
-
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