Hello, This series is the continuation of previous work by Vidya Sagar [1] to fix the issues related to accessing DBI register space before completing the core initialization in some EP platforms like Tegra194/234 and Qcom EP. Since Vidya is busy, I took over the series based on his consent (off-list discussion). NOTE ==== Based on the comments received in v7 [2], I've heavily modified the series to fix several other issues reported by Bjorn and Niklas. One noticeable change is getting rid of the 'core_init_notifer' flag added to differentiate between glue drivers requiring refclk from host and drivers getting refclk locally. By getting rid of this flag, now both the DWC EP driver and the EPF drivers can use a single flow and need not distinguish between the glue drivers. We can also get rid of the 'link_up_notifier' flag in the future by following the same convention. Testing ======= I've tested the series on Qcom SM8450 based dev board that depends on refclk from host with EPF_MHI driver. It'd be good to test this series on platforms that generate refclk locally and also with EPF_TEST driver. - Mani [1] https://lore.kernel.org/linux-pci/20221013175712.7539-1-vidyas@xxxxxxxxxx/ [2] https://lore.kernel.org/linux-pci/20231120084014.108274-1-manivannan.sadhasivam@xxxxxxxxxx/ Changes in v9: - Incorporated changes for missing drivers (Niklas) - Reworded the dw_pcie_ep_cleanup() API kdoc (Niklas) - Reworded the description of patch 6/10 (Frank) - Collected reviews - Link to v8: https://lore.kernel.org/r/20240224-pci-dbi-rework-v8-0-64c7fd0cfe64@xxxxxxxxxx Changes in v8: - Rebased on top of v6.8-rc1 - Removed the deinit callback from struct dw_pcie_ep_ops - Renamed dw_pcie_ep_exit() to dw_pcie_ep_deinit() - Introduced dw_pcie_ep_cleanup() API for drivers supporting PERST# - Renamed dw_pcie_ep_init_complete() to dw_pcie_ep_init_registers() - Called dw_pcie_ep_init_registers() API directly from all glue drivers - Removed "core_init_notifier" flag - Added a generic dw_pcie_ep_linkdown() API to handle LINK_DOWN event and used it in qcom driver - Added Kernel-doc comments for DWC EP APIs Changes in v7: - Rebased on top of v6.7-rc1 - Kept the current dw_pcie_ep_init_complete() API instead of renaming it to dw_pcie_ep_init_late(), since changing the name causes a slight ambiguity. - Splitted the change that moves pci_epc_init_notify() inside dw_pcie_ep_init_notify() to help bisecting and also to avoid build issue. - Added a new patch that moves pci_epc_init_notify() inside dw_pcie_ep_init_notify(). - Took over the authorship and dropped the previous Ack as the patches are heavily modified. Changes in v6: - Rebased on top of pci/next (6e2fca71e187) - removed ep_init_late() callback as it is no longer necessary For previous changelog, please refer [1]. Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx> --- Manivannan Sadhasivam (10): PCI: dwc: ep: Remove deinit() callback from struct dw_pcie_ep_ops PCI: dwc: ep: Rename dw_pcie_ep_exit() to dw_pcie_ep_deinit() PCI: dwc: ep: Introduce dw_pcie_ep_cleanup() API for drivers supporting PERST# PCI: dwc: ep: Fix DBI access failure for drivers requiring refclk from host PCI: dwc: ep: Rename dw_pcie_ep_init_complete() to dw_pcie_ep_init_registers() PCI: dwc: ep: Call dw_pcie_ep_init_registers() API directly from all glue drivers PCI: dwc: ep: Remove "core_init_notifier" flag PCI: dwc: ep: Add a generic dw_pcie_ep_linkdown() API to handle LINK_DOWN event PCI: qcom-ep: Use the generic dw_pcie_ep_linkdown() API to handle LINK_DOWN event PCI: dwc: ep: Add Kernel-doc comments for APIs drivers/pci/controller/dwc/pci-dra7xx.c | 9 + drivers/pci/controller/dwc/pci-imx6.c | 10 + drivers/pci/controller/dwc/pci-keystone.c | 11 + drivers/pci/controller/dwc/pci-layerscape-ep.c | 9 + drivers/pci/controller/dwc/pcie-artpec6.c | 15 +- drivers/pci/controller/dwc/pcie-designware-ep.c | 309 +++++++++++++++------- drivers/pci/controller/dwc/pcie-designware-plat.c | 11 + drivers/pci/controller/dwc/pcie-designware.h | 19 +- drivers/pci/controller/dwc/pcie-keembay.c | 18 +- drivers/pci/controller/dwc/pcie-qcom-ep.c | 6 +- drivers/pci/controller/dwc/pcie-rcar-gen4.c | 28 +- drivers/pci/controller/dwc/pcie-tegra194.c | 5 +- drivers/pci/controller/dwc/pcie-uniphier-ep.c | 15 +- drivers/pci/endpoint/functions/pci-epf-test.c | 18 +- include/linux/pci-epc.h | 3 - 15 files changed, 354 insertions(+), 132 deletions(-) --- base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d change-id: 20240224-pci-dbi-rework-b2e99a62930c Best regards, -- Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
