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Commit f3d7f23f authored by Arjan van de Ven's avatar Arjan van de Ven Committed by Jeff Garzik
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ahci: add a module parameter to ignore the SSS flags for async scanning 



The SSS flag, which directs the OS to spin up one disk at a time
to not have the PSU blow out, sometimes gets set even when not needed.
The effect of this is a longer-than-needed boot time.

This patch adds a module parameter that makes the driver ignore SSS
at least as far as the parallel scan during boot is concerned...

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 4462254a

drivers/ata/ahci.c

+8 −1
Original line number Diff line number Diff line
@@ -61,9 +61,14 @@ 
#define EM_MSG_LED_VALUE_ON           0x00010000



static int ahci_skip_host_reset;

static int ahci_ignore_sss;



module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);

MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");



module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);

MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");



static int ahci_enable_alpm(struct ata_port *ap,

		enum link_pm policy);

static void ahci_disable_alpm(struct ata_port *ap);
@@ -2692,8 +2697,10 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 
	host->iomap = pcim_iomap_table(pdev);

	host->private_data = hpriv;



	if (!(hpriv->cap & HOST_CAP_SSS))

	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)

		host->flags |= ATA_HOST_PARALLEL_SCAN;

	else

		printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");



	if (pi.flags & ATA_FLAG_EM)

		ahci_reset_em(host);