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Drivers/PCIe: Fix the failure of enumerating devices under root subordinate

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Bugfix for the commit of a20c7f36bd3d ("PCI: Do not allocate more buses than available in
parent").With this patch enumeration stops digging deeper downstream as soon as bus num 0x01 has been assigned, which is always the case for a bridge device.This results in all devices behind a bridge bus to remain undetected, as these would be connected to bus 0x02 or higher.

Reference to https://patchwork.ozlabs.org/patch/857566/

Signed-off-by: Yao Chen <chenyao11@huawei.com>
This commit is contained in:
Yao Chen
2018-02-28 16:10:04 +08:00
committed by Guodong Xu
parent a5e090208b
commit 1bc151858c
1 changed files with 1 additions and 1 deletions
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drivers/pci/host/pcie-designware.c
+1 -1
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@@ -861,7 +861,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
/* setup bus numbers */ /* setup bus numbers */
val = dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS); val = dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS);
val &= 0xff000000; val &= 0xff000000;
val |= 0x00010100; val |= 0x00ff0100;
dw_pcie_writel_rc(pp, PCI_PRIMARY_BUS, val); dw_pcie_writel_rc(pp, PCI_PRIMARY_BUS, val);
/* setup command register */ /* setup command register */