Bug 219747

Summary:	ATA_QUIRK_NOLPM breaks entering lower package states on kernel 6.14-rc1
Product:	Linux	Reporter:	Dieter Mummenschanz (dmummenschanz)
Component:	Kernel	Assignee:	Virtual Assignee for IO Storage/Serial ATA (io_serialata)
Status:	NEW ---
Severity:	high	CC:	cassel, pmenzel+bugzilla.kernel.org
Priority:	P3
Hardware:	Intel
OS:	Linux
Kernel Version:	6.14-rc1	Subsystem:
Regression:	Yes	Bisected commit-id:	cc77e2ce187d26cc66af3577bf896d7410eb25ab
Attachments:	dmesg log

Description Dieter Mummenschanz 2025-02-03 09:11:58 UTC

Hi, 

libata-core commit: "Add ATA_QUIRK_NOLPM for Samsung SSD 870 QVO drives" breaks LPM and therefore entering lower package states on my system with two Samsung SSD 870 QVO installed!

The kernel is configured with CONFIG_SATA_MOBILE_LPM_POLICTY=3

I have two 870 QVO drives connected to ata5.00 and ata6.00

[    1.350788] ata5.00: Model 'Samsung SSD 870 QVO 8TB', rev 'SVQ02B6Q', applying quirks: noncqtrim nolpm zeroaftertrim noncqonati
[    1.351014] ata5.00: ATA-11: Samsung SSD 870 QVO 8TB, SVQ02B6Q, max UDMA/133
[    1.377847] scsi 4:0:0:0: Direct-Access     ATA      Samsung SSD 870  2B6Q PQ: 0 ANSI: 5
[    1.761596] ata6.00: Model 'Samsung SSD 870 QVO 8TB', rev 'SVQ02B6Q', applying quirks: noncqtrim nolpm zeroaftertrim noncqonati
[    1.763281] ata6.00: ATA-11: Samsung SSD 870 QVO 8TB, SVQ02B6Q, max UDMA/133
[    1.791618] scsi 5:0:0:0: Direct-Access     ATA      Samsung SSD 870  2B6Q PQ: 0 ANSI: 5

/sys/class/scsi_host/host5/link_power_management_policy and
/sys/class/scsi_host/host6/link_power_management_policy is stuck at max_performance and cannot be changed and no packages states below pc2 are reached.

Comment 1 Dieter Mummenschanz 2025-02-03 09:13:13 UTC

Created attachment 307569 [details]
dmesg log

Comment 2 Paul Menzel 2025-03-02 10:41:46 UTC

Commit a2f925a2f622 [1] reverts the commit you mention, and should be in Linux 6.14-rc5.

[1]: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a2f925a2f62254119cdaa360cfc9c0424bccd531