Bug 207571

Summary:	TI PCIe-to-PCI Bridge ASPM L1 is not enabled, prevent SoC reaching deeper Package C-State > PC3
Product:	Drivers	Reporter:	Kai-Heng Feng (kai.heng.feng)
Component:	PCI	Assignee:	drivers_pci (drivers_pci)
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	juca
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	mainline	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg lspci under Windows lspci under Linux lspci -t

Description Kai-Heng Feng 2020-05-04 06:35:46 UTC

The device in question prevent the Intel SoC from entering deeper Package C-State like PC8, hence consumes unnecessary high power.

Comment 1 Kai-Heng Feng 2020-05-04 06:36:10 UTC

Created attachment 288883 [details]
dmesg

Comment 2 Kai-Heng Feng 2020-05-04 06:37:16 UTC

Created attachment 288885 [details]
lspci under Windows

ASPM L1 is enabled under Windows.

Comment 3 Kai-Heng Feng 2020-05-04 06:41:14 UTC

Created attachment 288887 [details]
lspci under Linux

Comment 4 Kai-Heng Feng 2020-05-04 06:41:54 UTC

Created attachment 288889 [details]
lspci -t

Comment 5 juan 2020-05-22 11:30:08 UTC

is this related to the Samsung SSD bug?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746340

Comment 6 Kai-Heng Feng 2020-05-22 11:36:53 UTC

No it's unrelated.

Comment 7 Kai-Heng Feng 2020-06-02 09:37:16 UTC

commit 66ff14e59e8a30690755b08bc3042359703fb07a
Author: Kai-Heng Feng <kai.heng.feng@canonical.com>
Date:   Wed May 6 01:34:21 2020 +0800

    PCI/ASPM: Allow ASPM on links to PCIe-to-PCI/PCI-X Bridges