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ata: libata-sata: improve sysfs description for ATA_LPM_UNKNOWN

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Currently, both ATA_LPM_UNKNOWN (0) and ATA_LPM_MAX_POWER (1) displays
as "max_performance" in sysfs.

This is quite misleading as they are not the same.

For ATA_LPM_UNKNOWN, ata_eh_set_lpm() will not be called at all,
leaving the configuration in unknown state.
For ATA_LPM_MAX_POWER, ata_eh_set_lpm() is called, and setting the
policy to ATA_LPM_MAX_POWER.

This also matches the description of the SATA_MOBILE_LPM_POLICY Kconfig:
0 => Keep firmware settings
1 => Maximum performance

Thus, update the sysfs description for ATA_LPM_UNKNOWN to match reality.

While at it, update libata.h to mention that the ascii descriptions
are in libata-sata.c and not in libata-scsi.c.

Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Niklas Cassel <cassel@kernel.org>
This commit is contained in:
Niklas Cassel 2024-01-11 17:57:44 +01:00
parent 6613476e22
commit 73ae7e1c76
2 changed files with 2 additions and 2 deletions
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2
drivers/ata/libata-sata.c
View file

@ -784,7 +784,7 @@ bool sata_lpm_ignore_phy_events(struct ata_link *link)
EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
static const char *ata_lpm_policy_names[] = {
[ATA_LPM_UNKNOWN] = "max_performance",
[ATA_LPM_UNKNOWN] = "keep_firmware_settings",
[ATA_LPM_MAX_POWER] = "max_performance",
[ATA_LPM_MED_POWER] = "medium_power",
[ATA_LPM_MED_POWER_WITH_DIPM] = "med_power_with_dipm",

2
include/linux/libata.h
View file

@ -471,7 +471,7 @@ enum ata_completion_errors {
/*
* Link power management policy: If you alter this, you also need to
* alter libata-scsi.c (for the ascii descriptions)
* alter libata-sata.c (for the ascii descriptions)
*/
enum ata_lpm_policy {
ATA_LPM_UNKNOWN,