#define DRV_NAME "ahci"
#define DRV_VERSION "3.0"
+/* Enclosure Management Control */
+#define EM_CTRL_MSG_TYPE 0x000f0000
+
+/* Enclosure Management LED Message Type */
+#define EM_MSG_LED_HBA_PORT 0x0000000f
+#define EM_MSG_LED_PMP_SLOT 0x0000ff00
+#define EM_MSG_LED_VALUE 0xffff0000
+#define EM_MSG_LED_VALUE_ACTIVITY 0x00070000
+#define EM_MSG_LED_VALUE_OFF 0xfff80000
+#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);
static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
ssize_t size);
#define MAX_SLOTS 8
+#define MAX_RETRY 15
enum {
AHCI_PCI_BAR = 5,
board_ahci_ign_iferr = 2,
board_ahci_sb600 = 3,
board_ahci_mv = 4,
- board_ahci_sb700 = 5,
+ board_ahci_sb700 = 5, /* for SB700 and SB800 */
board_ahci_mcp65 = 6,
board_ahci_nopmp = 7,
+ board_ahci_yesncq = 8,
/* global controller registers */
HOST_CAP = 0x00, /* host capabilities */
static struct device_attribute *ahci_sdev_attrs[] = {
&dev_attr_sw_activity,
+ &dev_attr_unload_heads,
NULL
};
/* board_ahci */
{
.flags = AHCI_FLAG_COMMON,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
{
AHCI_HFLAGS (AHCI_HFLAG_NO_NCQ | AHCI_HFLAG_NO_PMP),
.flags = AHCI_FLAG_COMMON,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_vt8251_ops,
},
{
AHCI_HFLAGS (AHCI_HFLAG_IGN_IRQ_IF_ERR),
.flags = AHCI_FLAG_COMMON,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
AHCI_HFLAG_32BIT_ONLY | AHCI_HFLAG_NO_MSI |
AHCI_HFLAG_SECT255),
.flags = AHCI_FLAG_COMMON,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_sb600_ops,
},
AHCI_HFLAG_MV_PATA | AHCI_HFLAG_NO_PMP),
.flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
- /* board_ahci_sb700 */
+ /* board_ahci_sb700, for SB700 and SB800 */
{
AHCI_HFLAGS (AHCI_HFLAG_IGN_SERR_INTERNAL),
.flags = AHCI_FLAG_COMMON,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_sb600_ops,
},
{
AHCI_HFLAGS (AHCI_HFLAG_YES_NCQ),
.flags = AHCI_FLAG_COMMON,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
{
AHCI_HFLAGS (AHCI_HFLAG_NO_PMP),
.flags = AHCI_FLAG_COMMON,
- .pio_mask = 0x1f, /* pio0-4 */
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_ops,
+ },
+ /* board_ahci_yesncq */
+ {
+ AHCI_HFLAGS (AHCI_HFLAG_YES_NCQ),
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_ops,
},
{ PCI_VDEVICE(NVIDIA, 0x045d), board_ahci_mcp65 }, /* MCP65 */
{ PCI_VDEVICE(NVIDIA, 0x045e), board_ahci_mcp65 }, /* MCP65 */
{ PCI_VDEVICE(NVIDIA, 0x045f), board_ahci_mcp65 }, /* MCP65 */
- { PCI_VDEVICE(NVIDIA, 0x0550), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0551), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0552), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0553), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0554), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0555), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0556), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0557), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0558), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x0559), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x055a), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x055b), board_ahci }, /* MCP67 */
- { PCI_VDEVICE(NVIDIA, 0x07f0), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f1), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f2), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f3), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f4), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f5), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f6), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f7), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f8), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07f9), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07fa), board_ahci }, /* MCP73 */
- { PCI_VDEVICE(NVIDIA, 0x07fb), board_ahci }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x0550), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0551), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0552), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0553), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0554), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0555), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0556), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0557), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0558), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x0559), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x055a), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x055b), board_ahci_yesncq }, /* MCP67 */
+ { PCI_VDEVICE(NVIDIA, 0x07f0), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f1), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f2), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f3), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f4), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f5), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f6), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f7), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f8), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07f9), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07fa), board_ahci_yesncq }, /* MCP73 */
+ { PCI_VDEVICE(NVIDIA, 0x07fb), board_ahci_yesncq }, /* MCP73 */
{ PCI_VDEVICE(NVIDIA, 0x0ad0), board_ahci }, /* MCP77 */
{ PCI_VDEVICE(NVIDIA, 0x0ad1), board_ahci }, /* MCP77 */
{ PCI_VDEVICE(NVIDIA, 0x0ad2), board_ahci }, /* MCP77 */
{ PCI_VDEVICE(NVIDIA, 0x0abd), board_ahci }, /* MCP79 */
{ PCI_VDEVICE(NVIDIA, 0x0abe), board_ahci }, /* MCP79 */
{ PCI_VDEVICE(NVIDIA, 0x0abf), board_ahci }, /* MCP79 */
- { PCI_VDEVICE(NVIDIA, 0x0bc8), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bc9), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bca), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bcb), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bcc), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bcd), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bce), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bcf), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bc4), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bc5), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bc6), board_ahci }, /* MCP7B */
- { PCI_VDEVICE(NVIDIA, 0x0bc7), board_ahci }, /* MCP7B */
+ { PCI_VDEVICE(NVIDIA, 0x0d84), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d85), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d86), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d87), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d88), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d89), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d8a), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d8b), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d8c), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d8d), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d8e), board_ahci }, /* MCP89 */
+ { PCI_VDEVICE(NVIDIA, 0x0d8f), board_ahci }, /* MCP89 */
/* SiS */
{ PCI_VDEVICE(SI, 0x1184), board_ahci }, /* SiS 966 */
{ PCI_VDEVICE(MARVELL, 0x6145), board_ahci_mv }, /* 6145 */
{ PCI_VDEVICE(MARVELL, 0x6121), board_ahci_mv }, /* 6121 */
+ /* Promise */
+ { PCI_VDEVICE(PROMISE, 0x3f20), board_ahci }, /* PDC42819 */
+
/* Generic, PCI class code for AHCI */
{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
PCI_CLASS_STORAGE_SATA_AHCI, 0xffffff, board_ahci },
struct ahci_port_priv *pp = ap->private_data;
struct ata_link *link;
struct ahci_em_priv *emp;
+ ssize_t rc;
+ int i;
/* enable FIS reception */
ahci_start_fis_rx(ap);
/* turn on LEDs */
if (ap->flags & ATA_FLAG_EM) {
- ata_port_for_each_link(link, ap) {
+ ata_for_each_link(link, ap, EDGE) {
emp = &pp->em_priv[link->pmp];
- ahci_transmit_led_message(ap, emp->led_state, 4);
+
+ /* EM Transmit bit maybe busy during init */
+ for (i = 0; i < MAX_RETRY; i++) {
+ rc = ahci_transmit_led_message(ap,
+ emp->led_state,
+ 4);
+ if (rc == -EBUSY)
+ udelay(100);
+ else
+ break;
+ }
}
}
if (ap->flags & ATA_FLAG_SW_ACTIVITY)
- ata_port_for_each_link(link, ap)
+ ata_for_each_link(link, ap, EDGE)
ahci_init_sw_activity(link);
}
struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
unsigned long led_message = emp->led_state;
u32 activity_led_state;
+ unsigned long flags;
- led_message &= 0xffff0000;
+ led_message &= EM_MSG_LED_VALUE;
led_message |= ap->port_no | (link->pmp << 8);
/* check to see if we've had activity. If so,
* toggle state of LED and reset timer. If not,
* turn LED to desired idle state.
*/
+ spin_lock_irqsave(ap->lock, flags);
if (emp->saved_activity != emp->activity) {
emp->saved_activity = emp->activity;
/* get the current LED state */
- activity_led_state = led_message & 0x00010000;
+ activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
if (activity_led_state)
activity_led_state = 0;
activity_led_state = 1;
/* clear old state */
- led_message &= 0xfff8ffff;
+ led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
/* toggle state */
led_message |= (activity_led_state << 16);
mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
} else {
/* switch to idle */
- led_message &= 0xfff8ffff;
+ led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
if (emp->blink_policy == BLINK_OFF)
led_message |= (1 << 16);
}
+ spin_unlock_irqrestore(ap->lock, flags);
ahci_transmit_led_message(ap, led_message, 4);
}
struct ahci_em_priv *emp;
/* get the slot number from the message */
- pmp = (state & 0x0000ff00) >> 8;
+ pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
if (pmp < MAX_SLOTS)
emp = &pp->em_priv[pmp];
else
em_ctl = readl(mmio + HOST_EM_CTL);
if (em_ctl & EM_CTL_TM) {
spin_unlock_irqrestore(ap->lock, flags);
- return -EINVAL;
+ return -EBUSY;
}
/*
message[0] |= (4 << 8);
/* ignore 0:4 of byte zero, fill in port info yourself */
- message[1] = ((state & 0xfffffff0) | ap->port_no);
+ message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
/* write message to EM_LOC */
writel(message[0], mmio + hpriv->em_loc);
writel(message[1], mmio + hpriv->em_loc+4);
/* save off new led state for port/slot */
- emp->led_state = message[1];
+ emp->led_state = state;
/*
* tell hardware to transmit the message
struct ahci_em_priv *emp;
int rc = 0;
- ata_port_for_each_link(link, ap) {
+ ata_for_each_link(link, ap, EDGE) {
emp = &pp->em_priv[link->pmp];
rc += sprintf(buf, "%lx\n", emp->led_state);
}
state = simple_strtoul(buf, NULL, 0);
/* get the slot number from the message */
- pmp = (state & 0x0000ff00) >> 8;
+ pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
if (pmp < MAX_SLOTS)
emp = &pp->em_priv[pmp];
else
* activity led through em_message
*/
if (emp->blink_policy)
- state &= 0xfff8ffff;
+ state &= ~EM_MSG_LED_VALUE_ACTIVITY;
return ahci_transmit_led_message(ap, state, size);
}
link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
/* set the LED to OFF */
- port_led_state &= 0xfff80000;
+ port_led_state &= EM_MSG_LED_VALUE_OFF;
port_led_state |= (ap->port_no | (link->pmp << 8));
ahci_transmit_led_message(ap, port_led_state, 4);
} else {
link->flags |= ATA_LFLAG_SW_ACTIVITY;
if (val == BLINK_OFF) {
/* set LED to ON for idle */
- port_led_state &= 0xfff80000;
+ port_led_state &= EM_MSG_LED_VALUE_OFF;
port_led_state |= (ap->port_no | (link->pmp << 8));
- port_led_state |= 0x00010000; /* check this */
+ port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
ahci_transmit_led_message(ap, port_led_state, 4);
}
}
u32 serror;
/* determine active link */
- ata_port_for_each_link(link, ap)
+ ata_for_each_link(link, ap, EDGE)
if (ata_link_active(link))
break;
if (!link)
int rc;
if (using_dac &&
- !pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
- rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+ !pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
+ rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
if (rc) {
- rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+ rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"64-bit DMA enable failed\n");
}
}
} else {
- rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"32-bit DMA enable failed\n");
return rc;
}
- rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+ rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (rc) {
dev_printk(KERN_ERR, &pdev->dev,
"32-bit consistent DMA enable failed\n");
speed_s = "1.5";
else if (speed == 2)
speed_s = "3";
+ else if (speed == 3)
+ speed_s = "6";
else
speed_s = "?";
}
}
+static bool ahci_broken_system_poweroff(struct pci_dev *pdev)
+{
+ static const struct dmi_system_id broken_systems[] = {
+ {
+ .ident = "HP Compaq nx6310",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq nx6310"),
+ },
+ /* PCI slot number of the controller */
+ .driver_data = (void *)0x1FUL,
+ },
+ {
+ .ident = "HP Compaq 6720s",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq 6720s"),
+ },
+ /* PCI slot number of the controller */
+ .driver_data = (void *)0x1FUL,
+ },
+
+ { } /* terminate list */
+ };
+ const struct dmi_system_id *dmi = dmi_first_match(broken_systems);
+
+ if (dmi) {
+ unsigned long slot = (unsigned long)dmi->driver_data;
+ /* apply the quirk only to on-board controllers */
+ return slot == PCI_SLOT(pdev->devfn);
+ }
+
+ return false;
+}
+
static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int printed_version;
(pdev->revision == 0xa1 || pdev->revision == 0xa2))
hpriv->flags |= AHCI_HFLAG_NO_MSI;
- if ((hpriv->flags & AHCI_HFLAG_NO_MSI) || pci_enable_msi(pdev))
- pci_intx(pdev, 1);
+ /* SB800 does NOT need the workaround to ignore SERR_INTERNAL */
+ if (board_id == board_ahci_sb700 && pdev->revision >= 0x40)
+ hpriv->flags &= ~AHCI_HFLAG_IGN_SERR_INTERNAL;
+
+ if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))
+ pci_enable_msi(pdev);
/* save initial config */
ahci_save_initial_config(pdev, hpriv);
u32 em_loc = readl(mmio + HOST_EM_LOC);
u32 em_ctl = readl(mmio + HOST_EM_CTL);
- messages = (em_ctl & 0x000f0000) >> 16;
+ messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
/* we only support LED message type right now */
if ((messages & 0x01) && (ahci_em_messages == 1)) {
}
}
+ if (ahci_broken_system_poweroff(pdev)) {
+ pi.flags |= ATA_FLAG_NO_POWEROFF_SPINDOWN;
+ dev_info(&pdev->dev,
+ "quirky BIOS, skipping spindown on poweroff\n");
+ }
+
/* CAP.NP sometimes indicate the index of the last enabled
* port, at other times, that of the last possible port, so
* determining the maximum port number requires looking at
host->iomap = pcim_iomap_table(pdev);
host->private_data = hpriv;
+ 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);