The patch titled
ahci: enable GHC.AE bit before set GHC.HR
has been added to the -mm tree. Its filename is
ahci-enable-ghcae-bit-before-set-ghchr.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: ahci: enable GHC.AE bit before set GHC.HR
From: "Peer Chen" <peerchen@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/ata/ahci.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN drivers/ata/ahci.c~ahci-enable-ghcae-bit-before-set-ghchr drivers/ata/ahci.c
--- a/drivers/ata/ahci.c~ahci-enable-ghcae-bit-before-set-ghchr
+++ a/drivers/ata/ahci.c
@@ -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) {
_
Patches currently in -mm which might be from peerchen@xxxxxxxxx are
ahci-enable-ghcae-bit-before-set-ghchr.patch
ahci-enable-ghcae-bit-before-set-ghchr-fix.patch
ahci-add-mcp79-support-to-ahci-driver.patch
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