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Subject[PATCH RESEND v4 02/15] PCI: dwc: Detect iATU settings after getting "addr_space" resource
The iATU detection procedure was introduced in the commit 281f1f99cf3a
("PCI: dwc: Detect number of iATU windows"). A bit later the procedure
execution was moved to Host/EP-specific methods in the framework of commit
8bcca2658558 ("PCI: dwc: Move iATU detection earlier"). The later
modification wasn't done in the most optimal way since the "addr_space"
CSR region resource doesn't depend on anything detected in the
dw_pcie_iatu_detect() method. Thus the detection can be postponed to be
executed after the resource request which can fail and make the detection
pointless. It will be also helpful for the dw_pcie_ep_init() method
readability since we are about to add the IP-core version and eDMA module
(a bit later) detection procedures.

Signed-off-by: Serge Semin <>
Reviewed-by: Rob Herring <>


Changelog v2:
- This is a new patch added on v2 iteration of the series.
drivers/pci/controller/dwc/pcie-designware-ep.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 15b8059544e3..1e35542d6f72 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -704,8 +704,6 @@ 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;
@@ -713,6 +711,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
ep->phys_base = res->start;
ep->addr_size = resource_size(res);

+ dw_pcie_iatu_detect(pci);
ep->ib_window_map = devm_kcalloc(dev,
 \ /
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