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[PATCH] Fix HD activity LED with ahci 

Patch: fix wrong HD activity control by ahci driver

The ahci driver 1.0 sets the SActive bit on every transaction,
causing the LED to light up. The SActive bit is used only for
native command queuing (NCQ) which the current driver version
doesn't implement. Resetting the SActive bit is the device's
responsibility (by sending a "Set Device Bits FIS" to the
host adapter) but this is not required in response to
non-NCQ commands, and (most) devices don't. Thus the LED
stays always on. This patch fixes the LED behavior.

Spec references:
http://www.intel.com/technology/serialata/pdf/rev1_1.pdf, sec. 3.3.13, 5.5.1
http://www.serialata.org/docs/serialata10a.pdf
http://www.intel.com/design/storage/papers/25266401.pdf

Signed-off-by: Martin.Wilck@fujitsu-siemens.com
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Martin Wilck 2005-08-04 09:04:56 +02:00 committed by Jeff Garzik
parent 9309049544
commit c0b34ad295
1 changed files with 0 additions and 3 deletions
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3
drivers/scsi/ahci.c
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@ -698,9 +698,6 @@ static int ahci_qc_issue(struct ata_queued_cmd *qc)
struct ata_port *ap = qc->ap;
void *port_mmio = (void *) ap->ioaddr.cmd_addr;
writel(1, port_mmio + PORT_SCR_ACT);
readl(port_mmio + PORT_SCR_ACT); /* flush */
writel(1, port_mmio + PORT_CMD_ISSUE);
readl(port_mmio + PORT_CMD_ISSUE); /* flush */