PCI/ASPM: Allow ASPM on links to PCIe-to-PCI/PCI-X Bridges
7d715a6c ("PCI: add PCI Express ASPM support") added the ability for Linux to enable ASPM, but for some undocumented reason, it didn't enable ASPM on links where the downstream component is a PCIe-to-PCI/PCI-X Bridge. Remove this exclusion so we can enable ASPM on these links. The Dell OptiPlex 7080 mentioned in the bugzilla has a TI XIO2001 PCIe-to-PCI Bridge. Enabling ASPM on the link leading to it allows the Intel SoC to enter deeper Package C-states, which is a significant power savings. [bhelgaas: commit log] Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207571 Link: https://lore.kernel.org/r/20200505173423.26968-1-kai.heng.feng@canonical.com Signed-off-by:Kai-Heng Feng <kai.heng.feng@canonical.com> Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Reviewed-by:
Mika Westerberg <mika.westerberg@linux.intel.com>
parent
8f3d9f35
Please register or sign in to comment