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ata: libata_eh: Add debug messages to ata_eh_link_set_lpm()

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To facilitate field debugging of link power management related issues,
add a debug message to ata_eh_link_set_lpm() to easily track LPM policy
changes done from EH context, that is, during device scan and
revalidation, error handling, and when a policy change is issued through
a host sysfs link_power_management_policy attribute.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20250701125321.69496-11-dlemoal@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>
This commit is contained in:
Damien Le Moal
2025-07-01 21:53:21 +09:00
committed by Niklas Cassel
parent 3b50dd4c06
commit cb35d3b622
1 changed files with 2 additions and 0 deletions
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drivers/ata/libata-eh.c
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@@ -2140,6 +2140,8 @@ static int ata_eh_link_set_lpm(struct ata_link *link,
if (WARN_ON_ONCE(policy == ATA_LPM_UNKNOWN))
return 0;
ata_link_dbg(link, "Set LPM policy: %d -> %d\n", old_policy, policy);
/*
* DIPM is enabled only for ATA_LPM_MIN_POWER,
* ATA_LPM_MIN_POWER_WITH_PARTIAL, and ATA_LPM_MED_POWER_WITH_DIPM, as