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| author | Jian-Hong Pan <jhp@endlessos.org> | 2024-10-01 11:34:38 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2024-11-07 01:32:26 +0300 |
| commit | d66041063192497a4a97d21dbf86b79a03a7f4fb (patch) | |
| tree | 3d47b1a5dc4d1848ab5cd1e9d38d2e3cfed55a5c /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | e1714f3b1f4d2af5df26e4a0e4a70ef64b15e3ee (diff) | |
| download | linux-d66041063192497a4a97d21dbf86b79a03a7f4fb.tar.xz | |
PCI: vmd: Set devices to D0 before enabling PM L1 Substates
The remapped PCIe Root Port and the child device have PM L1 Substates
capability, but they are disabled originally.
Here is a failed example on ASUS B1400CEAE:
Capabilities: [900 v1] L1 PM Substates
L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- L1_PM_Substates+
PortCommonModeRestoreTime=32us PortTPowerOnTime=10us
L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1-
T_CommonMode=0us LTR1.2_Threshold=101376ns
L1SubCtl2: T_PwrOn=50us
Enable PCI-PM L1 PM Substates for devices below VMD while they are in D0
(see PCIe r6.0, sec 5.5.4).
Link: https://lore.kernel.org/r/20241001083438.10070-4-jhp@endlessos.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218394
Signed-off-by: Jian-Hong Pan <jhp@endlessos.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions