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Tue, 26 Mar 2024 23:36:26 -0700 (PDT) From: Manivannan Sadhasivam Subject: [PATCH v11 0/8] PCI: dwc: ep: Fix DBI access failure for drivers requiring refclk from host Date: Wed, 27 Mar 2024 12:05:46 +0530 Message-Id: <20240327-pci-dbi-rework-v11-0-6f5259f90673@linaro.org> MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAEK+A2YC/3XNTQ6CMBCG4auQrq3pH8i48h7GRWkHmGgoKQY1h Ltb2KghLr9J3mcmNmAkHNgxm1jEkQYKXRpS7jLmWts1yMmnA1NCGaGU4b0j7iviER8hXnmlEMA WCrRwLEV9xJqeq3i+pN3ScA/xtT4Yy+X6lxpLLnhh3KH2wtVYmNONOhvDPsSGLdYIn16LbQ+pV +CN1h7AebvppfgC5BaQIgnSWJO73IIu8UeY5/kNGub/wzABAAA= To: Jingoo Han , Gustavo Pimentel , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Marek Vasut , Yoshihiro Shimoda , Thierry Reding , Jonathan Hunter , Kishon Vijay Abraham I , Vidya Sagar , Vignesh Raghavendra , Richard Zhu , Lucas Stach , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Minghuan Lian , Mingkai Hu , Roy Zang , Kunihiko Hayashi , Masami Hiramatsu , Kishon Vijay Abraham I , Jesper Nilsson , Srikanth Thokala , Shawn Lin , Heiko Stuebner X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=6062; i=manivannan.sadhasivam@linaro.org; h=from:subject:message-id; bh=yMM+3zwLZxZ/ZMbIohXyczKS5iSP3NxVqCs+OJ3J4VE=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBmA75PRAvut4GbfcNsOr4y/V32q37nFAF+YZu53 +o8TlaUvPKJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCZgO+TwAKCRBVnxHm/pHO 9SJxB/9V/tinXUTW2Xk1kfas89qjE+hGIr9jXEdxVzlKGfYRBaAm1j8tDXPX3CuzreCu1mB3ZFc DtR64Qp+7iM/z1nCyBKukHTcSBx7eYzJZTVyfsn06A+5W9xU0pLgAydgXls8c3jn/q3yXZd8QKW yOfvvjsyrPCMzEcBJ6rbN2fOIEEM/XvqCh/2fd5JxL+GelMpxbGI6tzcwJ3+vPvc90MaCon6mbm tKCV4EA7kj35oQwUUpVG1l7Q2Arm50d0IplQYGgiYeu+NKoKkKiR8P6RKqZ01gHTsJmEB7RwteU +s5uhU6QAkrc80JovyU/H6eoSKldzEA+nJmHnIxIPPAE5JzK X-Developer-Key: i=manivannan.sadhasivam@linaro.org; a=openpgp; fpr=C668AEC3C3188E4C611465E7488550E901166008 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-rockchip@lists.infradead.org, linux-pci@vger.kernel.org, Manivannan Sadhasivam , Frank Li , linux-kernel@vger.kernel.org, linux-arm-kernel@axis.com, linux-renesas-soc@vger.kernel.org, Niklas Cassel , linux-arm-msm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-omap@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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@nvidia.com/ [2] https://lore.kernel.org/linux-pci/20231120084014.108274-1-manivannan.sadhasivam@linaro.org/ Changes in v11: - Minor cleanups reported by Niklas - 'epc->init_complete = false' is set in dw_pcie_ep_cleanup() to avoid triggering init complete notification before refclk. This will be moved to EPC core in the following series adding deinit notifier. - Collected review tags. - Link to v10: https://lore.kernel.org/r/20240314-pci-dbi-rework-v10-0-14a45c5a938e@linaro.org Changes in v10: - Reordered the commits by moving the independent fixes/cleanups first (Niklas) - Addressed several comments from Niklas - Moved PTM register setting out of dw_pcie_ep_init_non_sticky_registers() (Niklas) - Addressed the issue that EPF drivers were missing init notification after the removal of core_init_notifier (Niklas) - Dropped a few cleanup patches to be clubbed with the follow up series - Collected review tags - Dropped the review tags for patch 8/8 as it got changed - Link to v9: https://lore.kernel.org/r/20240304-pci-dbi-rework-v9-0-29d433d99cda@linaro.org 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@linaro.org 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 (8): PCI: dwc: ep: Fix DBI access failure for drivers requiring refclk from host PCI: dwc: ep: Add Kernel-doc comments for APIs 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: 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: endpoint: Remove "core_init_notifier" flag drivers/pci/controller/cadence/pcie-cadence-ep.c | 2 + 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 | 238 +++++++++++++++------- drivers/pci/controller/dwc/pcie-designware-plat.c | 11 + drivers/pci/controller/dwc/pcie-designware.h | 14 +- drivers/pci/controller/dwc/pcie-keembay.c | 18 +- drivers/pci/controller/dwc/pcie-qcom-ep.c | 4 +- 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/controller/pcie-rcar-ep.c | 2 + drivers/pci/controller/pcie-rockchip-ep.c | 2 + drivers/pci/endpoint/functions/pci-epf-test.c | 18 +- drivers/pci/endpoint/pci-ep-cfs.c | 9 + drivers/pci/endpoint/pci-epc-core.c | 22 ++ include/linux/pci-epc.h | 7 +- 20 files changed, 338 insertions(+), 111 deletions(-) --- base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d change-id: 20240224-pci-dbi-rework-b2e99a62930c Best regards,