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, 8 insertions, 3 deletions

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);