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libata: clean up lpm related symbols and sysfs show/store functions

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Link power management related symbols are in confusing state w/ mixed
usages of lpm, ipm and pm.  This patch cleans up lpm related symbols
and sysfs show/store functions as follows.

* lpm states - NOT_AVAILABLE, MIN_POWER, MAX_PERFORMANCE and
  MEDIUM_POWER are renamed to ATA_LPM_UNKNOWN and
  ATA_LPM_{MIN|MAX|MED}_POWER.

* Pre/postfixes are unified to lpm.

* sysfs show/store functions for link_power_management_policy were
  curiously named get/put and unnecessarily complex.  Renamed to
  show/store and simplified.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo
2010-09-01 17:50:04 +02:00
committed by Jeff Garzik
parent c43d559f04
commit c93b263e0d
9 changed files with 79 additions and 100 deletions
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20
drivers/ata/libahci.c
View File

@@ -56,8 +56,7 @@ 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 int ahci_enable_alpm(struct ata_port *ap, enum ata_lpm_policy policy);
static void ahci_disable_alpm(struct ata_port *ap);
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,
@@ -649,7 +648,7 @@ static void ahci_disable_alpm(struct ata_port *ap)
u32 cmd;
struct ahci_port_priv *pp = ap->private_data;
/* IPM bits should be disabled by libata-core */
/* LPM bits should be disabled by libata-core */
/* get the existing command bits */
cmd = readl(port_mmio + PORT_CMD);
@@ -691,8 +690,7 @@ static void ahci_disable_alpm(struct ata_port *ap)
*/
}
static int ahci_enable_alpm(struct ata_port *ap,
enum link_pm policy)
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);
@@ -705,21 +703,21 @@ static int ahci_enable_alpm(struct ata_port *ap,
return -EINVAL;
switch (policy) {
case MAX_PERFORMANCE:
case NOT_AVAILABLE:
case ATA_LPM_MAX_POWER:
case ATA_LPM_UNKNOWN:
/*
* if we came here with NOT_AVAILABLE,
* 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.
*/
ahci_disable_alpm(ap);
return 0;
case MIN_POWER:
case ATA_LPM_MIN_POWER:
/* configure HBA to enter SLUMBER */
asp = PORT_CMD_ASP;
break;
case MEDIUM_POWER:
case ATA_LPM_MED_POWER:
/* configure HBA to enter PARTIAL */
asp = 0;
break;
@@ -762,7 +760,7 @@ static int ahci_enable_alpm(struct ata_port *ap,
writel(cmd, port_mmio + PORT_CMD);
cmd = readl(port_mmio + PORT_CMD);
/* IPM bits should be set by libata-core */
/* LPM bits should be set by libata-core */
return 0;
}