On Thu, Mar 25, 2021 at 10:24:28AM +0100, Marek Szyprowski wrote: > On 25.01.2021 05:48, Zhiqiang Hou wrote: > > From: Hou Zhiqiang <zhiqiang....@nxp.com> > > > > In the dw_pcie_ep_init(), it depends on the detected iATU region > > numbers to allocate the in/outbound window management bit map. > > It fails after the commit 281f1f99cf3a ("PCI: dwc: Detect number > > of iATU windows"). > > > > So this patch move the iATU region detection into a new function, > > move forward the detection to the very beginning of functions > > dw_pcie_host_init() and dw_pcie_ep_init(). And also remove it > > from the dw_pcie_setup(), since it's more like a software > > perspective initialization step than hardware setup. > > > > Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows") > > Signed-off-by: Hou Zhiqiang <zhiqiang....@nxp.com> > > This patch causes exynos-pcie to hang during the initialization. It > looks that some resources are not enabled yet, so calling > dw_pcie_iatu_detect() much earlier causes a hang. When I have some time, > I will try to identify what is needed to call it properly.
Thanks, I dropped it for now. We can add it back after we figure out what the exynos issue is. For reference, here's the patch I dropped (I had made some minor corrections to the commit log): commit fd4162f05194 ("PCI: dwc: Move iATU detection earlier") Author: Hou Zhiqiang <zhiqiang....@nxp.com> Date: Mon Jan 25 12:48:03 2021 +0800 PCI: dwc: Move iATU detection earlier dw_pcie_ep_init() depends on the detected iATU region numbers to allocate the in/outbound window management bitmap. It fails after 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows"). Move the iATU region detection into a new function, move the detection to the very beginning of dw_pcie_host_init() and dw_pcie_ep_init(). Also remove it from the dw_pcie_setup(), since it's more like a software initialization step than hardware setup. Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows") Link: https://lore.kernel.org/r/20210125044803.4310-1-zhiqiang....@nxp.com Tested-by: Kunihiko Hayashi <hayashi.kunih...@socionext.com> Signed-off-by: Hou Zhiqiang <zhiqiang....@nxp.com> Signed-off-by: Bjorn Helgaas <bhelg...@google.com> Reviewed-by: Rob Herring <r...@kernel.org> Cc: sta...@vger.kernel.org # v5.11+ diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c index 1c25d8337151..8d028a88b375 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -705,6 +705,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) } } + dw_pcie_iatu_detect(pci); + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space"); if (!res) return -EINVAL; diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 7e55b2b66182..52f6887179cd 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -319,6 +319,8 @@ int dw_pcie_host_init(struct pcie_port *pp) return PTR_ERR(pci->dbi_base); } + dw_pcie_iatu_detect(pci); + bridge = devm_pci_alloc_host_bridge(dev, 0); if (!bridge) return -ENOMEM; diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 004cb860e266..a945f0c0e73d 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -660,11 +660,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci) pci->num_ob_windows = ob; } -void dw_pcie_setup(struct dw_pcie *pci) +void dw_pcie_iatu_detect(struct dw_pcie *pci) { - u32 val; struct device *dev = pci->dev; - struct device_node *np = dev->of_node; struct platform_device *pdev = to_platform_device(dev); if (pci->version >= 0x480A || (!pci->version && @@ -693,6 +691,13 @@ void dw_pcie_setup(struct dw_pcie *pci) dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound", pci->num_ob_windows, pci->num_ib_windows); +} + +void dw_pcie_setup(struct dw_pcie *pci) +{ + u32 val; + struct device *dev = pci->dev; + struct device_node *np = dev->of_node; if (pci->link_gen > 0) dw_pcie_link_set_max_speed(pci, pci->link_gen); diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 7247c8b01f04..7d6e9b7576be 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -306,6 +306,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index, void dw_pcie_disable_atu(struct dw_pcie *pci, int index, enum dw_pcie_region_type type); void dw_pcie_setup(struct dw_pcie *pci); +void dw_pcie_iatu_detect(struct dw_pcie *pci); static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val) {