The function used to determine if iATU unroll is available will read
a RC register. This is not possible and will result in a system hang
if the RC is still in reset, so it is only safe to call this function
after host_init() has been called.
Fixes: a0601a470537 (PCI: designware: Add iATU Unroll feature)
Reported-by: Gary Bisson <gary.bisson@xxxxxxxxxxxxxxxxxxx>
Tested-by: Gary Bisson <gary.bisson@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
drivers/pci/host/pcie-designware.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 035f50c03281..74510508fafc 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -637,11 +637,11 @@ int dw_pcie_host_init(struct pcie_port *pp)
}
}
- pp->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pp);
-
if (pp->ops->host_init)
pp->ops->host_init(pp);
+ pp->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pp);
+
pp->root_bus_nr = pp->busn->start;
if (IS_ENABLED(CONFIG_PCI_MSI)) {
bus = pci_scan_root_bus_msi(pp->dev, pp->root_bus_nr,
--
2.9.3
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