We just bought a Qualcomm RB5 with a mezz board and installed Linaro 21.12 release. Our device is a PCIe WWAN device attached to the mezz board, but it is not working on RB5 since the MSI is not support on the RB5 Qualcomm PCI bridge (Qualcomm Device 010b). How could we enable MSI if possible?
Here is “sudo lspci -vv” output:
0001:00:00.0 PCI bridge: Qualcomm Device 010b (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 183
IOMMU group: 7
Region 0: Memory at 40700000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=00, secondary=01, subordinate=ff, sec-latency=0
I/O behind bridge: 100000-100fff [size=4K] [16-bit]
Memory behind bridge: 40300000-404fffff [size=2M] [32-bit]
Prefetchable memory behind bridge: 40500000-406fffff [size=2M] [32-bit]
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16- MAbort- >Reset- FastB2B-
PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] MSI: Enable- Count=1/32 Maskable+ 64bit+
Address: 0000000000000000 Data: 0000
Masking: 00000000 Pending: 00000000
MSI is disabled.
0001:01:00.0 Unassigned class [ff00]: Qualcomm Device 0306
Subsystem: Qualcomm Device 010c
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- SERR- <PERR- INTx-
Latency: 0
Interrupt: pin ? routed to IRQ 189
IOMMU group: 7
Region 0: Memory at 40300000 (64-bit, non-prefetchable) [size=4K]
Region 2: Memory at 40301000 (64-bit, non-prefetchable) [size=4K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] MSI: Enable+ Count=8/32 Maskable+ 64bit+
Address: 00000000fffff108 Data: 0000
Masking: fffffff0 Pending: 00000000
Our device has MSI enabled. However, the Qualcomm PCIe bridge has it disabled so we cannot get interrupt from our device.
Thanks,
Adam
