The subordinate value indicates the highest bus number which can be
reached downstream though a certain device.
Commit a20c7f36bd3d ("PCI: Do not allocate more buses than available in
parent")
ensures that downstream devices cannot assign busnumbers higher than the
upstream device subordinate number, which was indeed illogical.
By default, dw_pcie_setup_rc() inits the Root Complex subordinate to a
value of 0x01.
Due to this combined with above commit, 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.
Fix this by initializing the RC to a subordinate value of 0xff, which is
not altering hardware behaviour in any way, but informs probing
function pci_scan_bridge() later on which reads this value back from
register.
Following nasty errors during boot are also fixed by this:
[ 0.459145] pci_bus 0000:02: busn_res: can not insert [bus 02-ff]
under [bus 01] (conflicts with (null) [bus 01])
...
[ 0.464515] pci_bus 0000:03: [bus 03] partially hidden behind bridge
0000:01 [bus 01]
...
[ 0.464892] pci_bus 0000:04: [bus 04] partially hidden behind bridge
0000:01 [bus 01]
...
[ 0.466488] pci_bus 0000:05: [bus 05] partially hidden behind bridge
0000:01 [bus 01]
[ 0.466506] pci_bus 0000:02: busn_res: [bus 02-ff] end is updated to
05
[ 0.466517] pci_bus 0000:02: busn_res: can not insert [bus 02-05]
under [bus 01] (conflicts with (null) [bus 01])
[ 0.466534] pci_bus 0000:02: [bus 02-05] partially hidden behind
bridge 0000:01 [bus 01]
Fixes: a20c7f36bd3d ("PCI: Do not allocate more buses than available in
parent")
Signed-off-by: Koen Vandeputte <koen.vandeputte@xxxxxxxxxxxx>
Tested-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
Cc: Binghui Wang <wangbinghui@xxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Jesper Nilsson <jesper.nilsson@xxxxxxxx>
Cc: Jianguo Sun <sunjianguo1@xxxxxxxxxx>
Cc: Jingoo Han <jingoohan1@xxxxxxxxx>
Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Cc: Minghuan Lian <minghuan.Lian@xxxxxxxxxxxxx>
Cc: Mingkai Hu <mingkai.hu@xxxxxxxxxxxxx>
Cc: Murali Karicheri <m-karicheri2@xxxxxx>
Cc: Pratyush Anand <pratyush.anand@xxxxxxxxx>
Cc: Richard Zhu <hongxing.zhu@xxxxxxx>
Cc: Roy Zang <tie-fei.zang@xxxxxxxxxxxxx>
Cc: Shawn Guo <shawn.guo@xxxxxxxxxx>
Cc: Stanimir Varbanov <svarbanov@xxxxxxxxxx>
Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Cc: Xiaowei Song <songxiaowei@xxxxxxxxxxxxx>
Cc: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
---
drivers/pci/dwc/pcie-designware-host.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index bf558df5b7b3..2b5470173196 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -616,7 +616,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
/* setup bus numbers */
val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
val &= 0xff000000;
- val |= 0x00010100;
+ val |= 0x00ff0100;
dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
/* setup command register */
--
2.7.4
