pcie-qcom legacy interrupt support

* pcie-qcom legacy interrupt support
@ 2021-10-01  8:25 Pierre Le Magourou
  0 siblings, 0 replies; only message in thread
From: Pierre Le Magourou @ 2021-10-01  8:25 UTC (permalink / raw)
  To: linux-pci

Hello,

I am trying to use a PI7C9X440SL PCIe/USB adapter on Qualcomm sdm845 platform.
This PCIe device does not support MSI interrupts.

On 5.10 kernel, the pci device is detected but EHCI driver probe fails
with this message "Found HC with no IRQ. Check BIOS/PCI".

lspci shows that legacy interrupt cannot be found:
 #lspci -vv -nk -s 0000:03:00.2
 0000:03:00.2 0c03: 12d8:400f (rev 01) (prog-if 20 [EHCI])
        Subsystem: 12d8:400f
        Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Interrupt: pin C routed to IRQ 0
        Region 0: Memory at 60302000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [80] Power Management version 3
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [8c] MSI: Enable- Count=1/1 Maskable- 64bit-
                Address: 00000000  Data: 0000
        Capabilities: [e0] Express (v1) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s
<64ns, L1 <1us
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- NonFatalErr- FatalErr- UnsupReq-
AuxPwr+ TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s,
Exit Latency L0s <512ns
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s (ok), Width x1 (ok)
                        TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt-

It is not clear to me if legacy interrupts are supported by the
pcie-qcom driver.
Do I need to add the PCIe/USB device description in the device tree
for this to work ?

Thank you.

Pierre Le Magourou

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