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.

Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/linux-pci/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
Tested-by: Kunihiko Hayashi <[email protected]>
Tested-by: Marek Szyprowski <[email protected]>
Tested-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Hou Zhiqiang <[email protected]>
[DB: moved dw_pcie_iatu_detect to happen after host_init callback]
Signed-off-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Cc: [email protected]	# v5.11+
Cc: Marek Szyprowski <[email protected]>

1 files changed, 2 insertions, 0 deletions

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;