On Wed, Feb 14, 2024 at 05:16:09PM +0530, Manivannan Sadhasivam wrote: > Currently, PCI core will enable D3 support for PCI bridges only when the > following conditions are met: > > 1. Platform is ACPI based > 2. Thunderbolt controller is used > 3. pcie_port_pm=force passed in cmdline > > While options 1 and 2 do not apply to most of the DT based platforms, > option 3 will make the life harder for distro maintainers. Due to this, > runtime PM is also not getting enabled for the bridges. > > To fix this, let's make use of the "supports-d3" property [1] in the bridge > DT nodes to enable D3 support for the capable bridges. This will also allow > the capable bridges to support runtime PM, thereby conserving power. [...] > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> Reviewed-by: Lukas Wunner <lukas@xxxxxxxxx>
