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[libata] AHCI: enable AHCI mode, before using AHCI reset 

AHCI spec says host-reset bit may only be set when the ahci-enable bit
is also set.

Noticed by Peer Chen <peerchen@gmail.com>

Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeff Garzik 2007-09-26 00:02:41 -04:00
parent b90fe23bd5
commit 3cc3eb1148
1 changed files with 7 additions and 1 deletions
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8
drivers/ata/ahci.c
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@ -827,8 +827,14 @@ static int ahci_reset_controller(struct ata_host *host)
void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
u32 tmp;
/* global controller reset */
/* we must be in AHCI mode, before using anything
* AHCI-specific, such as HOST_RESET.
*/
tmp = readl(mmio + HOST_CTL);
if (!(tmp & HOST_AHCI_EN))
writel(tmp | HOST_AHCI_EN, mmio + HOST_CTL);
/* global controller reset */
if ((tmp & HOST_RESET) == 0) {
writel(tmp | HOST_RESET, mmio + HOST_CTL);
readl(mmio + HOST_CTL); /* flush */