On Tue, Mar 26, 2024 at 04:18:16PM +0530, Manivannan Sadhasivam wrote: > Hi, > > This series allows D3Hot for PCI bridges in Devicetree based platforms. > Even though most of the bridges in Devicetree platforms support D3Hot, PCI > core will allow D3Hot only when one of 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. > > Initially, I tried to fix this issue by using a Devicetree property [1], but > that was rejected by Bjorn and it was concluded that D3Hot should be allowed by > default for all the Devicetree based platforms. > > During the review of v3 series, Bjorn noted several shortcomings of the > pci_bridge_d3_possible() API [2] and I tried to address them in this series as > well. > > But please note that the patches 2 and 3 needs closer review from ACPI and x86 > folks since I've splitted the D3Hot and D3Cold handling based on my little > understanding of the code. > > Testing > ======= > > This series is tested on SM8450 based development board on top of [3]. > Bjorn, a gently ping on this series. - Mani > - Mani > > [1] https://lore.kernel.org/linux-pci/20240214-pcie-qcom-bridge-v3-1-3a713bbc1fd7@xxxxxxxxxx/ > [2] https://lore.kernel.org/linux-pci/20240305175107.GA539676@bhelgaas/ > [3] https://lore.kernel.org/linux-arm-msm/20240321-pcie-qcom-bridge-dts-v2-0-1eb790c53e43@xxxxxxxxxx/ > > Changes in v4: > - Added pci_bridge_d3_possible() rework based on comments from Bjorn > - Got rid of the DT property and allowed D3Hot by default on all DT platforms > > Changes in v3: > - Fixed kdoc, used of_property_present() and dev_of_node() (Lukas) > - Link to v2: https://lore.kernel.org/r/20240214-pcie-qcom-bridge-v2-1-9dd6dbb1b817@xxxxxxxxxx > > Changes in v2: > - Switched to DT based approach as suggested by Lukas. > - Link to v1: https://lore.kernel.org/r/20240202-pcie-qcom-bridge-v1-0-46d7789836c0@xxxxxxxxxx > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > --- > Manivannan Sadhasivam (4): > PCI/portdrv: Make use of pci_dev::bridge_d3 for checking the D3 possibility > PCI: Rename pci_bridge_d3_possible() to pci_bridge_d3_allowed() > PCI: Decouple D3Hot and D3Cold handling for bridges > PCI: Allow PCI bridges to go to D3Hot on all Devicetree based platforms > > drivers/pci/bus.c | 2 +- > drivers/pci/pci-acpi.c | 9 ++--- > drivers/pci/pci-sysfs.c | 2 +- > drivers/pci/pci.c | 90 ++++++++++++++++++++++++++++++++-------------- > drivers/pci/pci.h | 12 ++++--- > drivers/pci/pcie/portdrv.c | 16 ++++----- > drivers/pci/remove.c | 2 +- > include/linux/pci.h | 3 +- > 8 files changed, 89 insertions(+), 47 deletions(-) > --- > base-commit: 705c1da8fa4816fb0159b5602fef1df5946a3ee2 > change-id: 20240320-pci-bridge-d3-092e2beac438 > > Best regards, > -- > Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> > -- மணிவண்ணன் சதாசிவம்
