lkml.org 
[lkml]   [2020]   [Jul]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: rtsx_pci not restoring ASPM state after suspend/resume
From
Date
On Fri, 2020-07-24 at 18:13 -0500, Bjorn Helgaas wrote:
>
> Maybe we should simplify this a little bit more. James, if you don't
> touch ASPM config at all, either manually or via udev, does the ASPM
> configuration stay the same across suspend/resume?
>

Yes, it stays the same. Explicitly:

With the udev rule disabled, immediately following clean boot from
power-off (and no additional tinkering), ASPM is OFF to the best of my
knowledge:

- link/l1_aspm in sysfs is 0 for PCI devices 0000:01:00.[01];
- the processor sleeps no deeper than package C3.

The situation above is the same following a suspend/resume cycle --
both in terms of sysfs, and observed package C-state occupancy.

[Tested on kernel 5.7.10, but the behaviour is the same as prior
kernels.]

Thanks,
James.

\
 
 \ /
  Last update: 2020-07-25 22:28    [W:0.081 / U:1.260 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site