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path: root/drivers/ata/libahci.c
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Diffstat (limited to 'drivers/ata/libahci.c')
-rw-r--r--drivers/ata/libahci.c158
1 files changed, 41 insertions, 117 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index ed7803f2b4f..437f9259778 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -56,8 +56,8 @@ 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 ata_lpm_policy policy);
-static void ahci_disable_alpm(struct ata_port *ap);
+static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+ unsigned hints);
static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
size_t size);
@@ -163,8 +163,7 @@ struct ata_port_operations ahci_ops = {
.pmp_attach = ahci_pmp_attach,
.pmp_detach = ahci_pmp_detach,
- .enable_pm = ahci_enable_alpm,
- .disable_pm = ahci_disable_alpm,
+ .set_lpm = ahci_set_lpm,
.em_show = ahci_led_show,
.em_store = ahci_led_store,
.sw_activity_show = ahci_activity_show,
@@ -641,126 +640,56 @@ static void ahci_power_up(struct ata_port *ap)
writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
}
-static void ahci_disable_alpm(struct ata_port *ap)
+static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
+ unsigned int hints)
{
+ struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
- void __iomem *port_mmio = ahci_port_base(ap);
- u32 cmd;
struct ahci_port_priv *pp = ap->private_data;
-
- /* LPM bits should be disabled by libata-core */
- /* get the existing command bits */
- cmd = readl(port_mmio + PORT_CMD);
-
- /* disable ALPM and ASP */
- cmd &= ~PORT_CMD_ASP;
- cmd &= ~PORT_CMD_ALPE;
-
- /* force the interface back to active */
- cmd |= PORT_CMD_ICC_ACTIVE;
-
- /* write out new cmd value */
- writel(cmd, port_mmio + PORT_CMD);
- cmd = readl(port_mmio + PORT_CMD);
-
- /* wait 10ms to be sure we've come out of any low power state */
- msleep(10);
-
- /* clear out any PhyRdy stuff from interrupt status */
- writel(PORT_IRQ_PHYRDY, port_mmio + PORT_IRQ_STAT);
-
- /* go ahead and clean out PhyRdy Change from Serror too */
- ahci_scr_write(&ap->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
-
- /*
- * Clear flag to indicate that we should ignore all PhyRdy
- * state changes
- */
- hpriv->flags &= ~AHCI_HFLAG_NO_HOTPLUG;
-
- /*
- * Enable interrupts on Phy Ready.
- */
- pp->intr_mask |= PORT_IRQ_PHYRDY;
- writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
-
- /*
- * don't change the link pm policy - we can be called
- * just to turn of link pm temporarily
- */
-}
-
-static int ahci_enable_alpm(struct ata_port *ap, enum ata_lpm_policy policy)
-{
- struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
- u32 cmd;
- struct ahci_port_priv *pp = ap->private_data;
- u32 asp;
-
- /* Make sure the host is capable of link power management */
- if (!(hpriv->cap & HOST_CAP_ALPM))
- return -EINVAL;
- switch (policy) {
- case ATA_LPM_MAX_POWER:
- case ATA_LPM_UNKNOWN:
+ if (policy != ATA_LPM_MAX_POWER) {
/*
- * if we came here with ATA_LPM_UNKNOWN,
- * it just means this is the first time we
- * have tried to enable - default to max performance,
- * and let the user go to lower power modes on request.
+ * Disable interrupts on Phy Ready. This keeps us from
+ * getting woken up due to spurious phy ready
+ * interrupts.
*/
- ahci_disable_alpm(ap);
- return 0;
- case ATA_LPM_MIN_POWER:
- /* configure HBA to enter SLUMBER */
- asp = PORT_CMD_ASP;
- break;
- case ATA_LPM_MED_POWER:
- /* configure HBA to enter PARTIAL */
- asp = 0;
- break;
- default:
- return -EINVAL;
+ pp->intr_mask &= ~PORT_IRQ_PHYRDY;
+ writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
+
+ sata_link_scr_lpm(link, policy, false);
}
- /*
- * Disable interrupts on Phy Ready. This keeps us from
- * getting woken up due to spurious phy ready interrupts
- * TBD - Hot plug should be done via polling now, is
- * that even supported?
- */
- pp->intr_mask &= ~PORT_IRQ_PHYRDY;
- writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
+ if (hpriv->cap & HOST_CAP_ALPM) {
+ u32 cmd = readl(port_mmio + PORT_CMD);
- /*
- * Set a flag to indicate that we should ignore all PhyRdy
- * state changes since these can happen now whenever we
- * change link state
- */
- hpriv->flags |= AHCI_HFLAG_NO_HOTPLUG;
+ if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
+ cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
+ cmd |= PORT_CMD_ICC_ACTIVE;
- /* get the existing command bits */
- cmd = readl(port_mmio + PORT_CMD);
+ writel(cmd, port_mmio + PORT_CMD);
+ readl(port_mmio + PORT_CMD);
- /*
- * Set ASP based on Policy
- */
- cmd |= asp;
+ /* wait 10ms to be sure we've come out of LPM state */
+ msleep(10);
+ } else {
+ cmd |= PORT_CMD_ALPE;
+ if (policy == ATA_LPM_MIN_POWER)
+ cmd |= PORT_CMD_ASP;
- /*
- * Setting this bit will instruct the HBA to aggressively
- * enter a lower power link state when it's appropriate and
- * based on the value set above for ASP
- */
- cmd |= PORT_CMD_ALPE;
+ /* write out new cmd value */
+ writel(cmd, port_mmio + PORT_CMD);
+ }
+ }
- /* write out new cmd value */
- writel(cmd, port_mmio + PORT_CMD);
- cmd = readl(port_mmio + PORT_CMD);
+ if (policy == ATA_LPM_MAX_POWER) {
+ sata_link_scr_lpm(link, policy, false);
+
+ /* turn PHYRDY IRQ back on */
+ pp->intr_mask |= PORT_IRQ_PHYRDY;
+ writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
+ }
- /* LPM bits should be set by libata-core */
return 0;
}
@@ -1658,15 +1587,10 @@ static void ahci_port_intr(struct ata_port *ap)
if (unlikely(resetting))
status &= ~PORT_IRQ_BAD_PMP;
- /* If we are getting PhyRdy, this is
- * just a power state change, we should
- * clear out this, plus the PhyRdy/Comm
- * Wake bits from Serror
- */
- if ((hpriv->flags & AHCI_HFLAG_NO_HOTPLUG) &&
- (status & PORT_IRQ_PHYRDY)) {
+ /* if LPM is enabled, PHYRDY doesn't mean anything */
+ if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
status &= ~PORT_IRQ_PHYRDY;
- ahci_scr_write(&ap->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
+ ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
}
if (unlikely(status & PORT_IRQ_ERROR)) {
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-29 11:35:30 +0000