[PATCH v4] PCI/portdev: Disable AER for Titan Ridge 4C 2018

[Mika Westerberg]

On Thu, Jan 08, 2026 at 02:18:04PM +0000, Atharva Tiwari wrote:
> linux mint wouldnt install, because it gives a GRUB error.
> so i cant compile the kernel, so the lspci is from 6.12:

That's fine, thanks!

> 00:1c.4/07:00.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06) (prog-if 00 [Normal decode])
> 	Subsystem: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:0000]
> 	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-
> 	Latency: 0
> 	Interrupt: pin A routed to IRQ 10
> 	IOMMU group: 14
> 	Bus: primary=07, secondary=08, subordinate=7c, sec-latency=0
> 	I/O behind bridge: 5000-8fff [size=16K] [16-bit]
> 	Memory behind bridge: 81900000-8fafffff [size=226M] [32-bit]
> 	Prefetchable memory behind bridge: b1800000-bf7fffff [size=224M] [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: [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: [88] MSI: Enable- Count=1/1 Maskable- 64bit+
> 		Address: 0000000000000000  Data: 0000
> 	Capabilities: [ac] Subsystem: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:0000]
> 	Capabilities: [c0] Express (v2) Upstream Port, MSI 00
> 		DevCap:	MaxPayload 128 bytes, PhantFunc 0
> 			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ SlotPowerLimit 25W
> 		DevCtl:	CorrErr+ NonFatalErr+ FatalErr+ UnsupReq+
> 			RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
> 			MaxPayload 128 bytes, MaxReadReq 512 bytes
> 		DevSta:	CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend-
> 		LnkCap:	Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L1 <2us
> 			ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
> 		LnkCtl:	ASPM Disabled; Disabled- CommClk+
> 			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> 		LnkSta:	Speed 8GT/s, Width x4
> 			TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> 		DevCap2: Completion Timeout: Not Supported, TimeoutDis- NROPrPrP- LTR+
> 			 10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt- EETLPPrefix-
> 			 EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
> 			 FRS-
> 			 AtomicOpsCap: Routing-
> 		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR+ 10BitTagReq- OBFF Disabled,
> 			 AtomicOpsCtl: EgressBlck-
> 		LnkCap2: Supported Link Speeds: 2.5-8GT/s, Crosslink- Retimer- 2Retimers- DRS-
> 		LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
> 			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
> 			 Compliance Preset/De-emphasis: -6dB de-emphasis, 0dB preshoot
> 		LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+ EqualizationPhase1+
> 			 EqualizationPhase2+ EqualizationPhase3+ LinkEqualizationRequest-
> 			 Retimer- 2Retimers- CrosslinkRes: unsupported
> 	Capabilities: [50] Capability ID 0x15 [0000]
> 	Capabilities: [100 v1] Device Serial Number ee-ad-a4-f1-8e-b3-02-00
> 	Capabilities: [200 v1] Advanced Error Reporting
> 		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> 		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> 		UESvrt:	DLP+ SDES- TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
> 		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr-
> 		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
> 		AERCap:	First Error Pointer: 00, ECRCGenCap- ECRCGenEn- ECRCChkCap- ECRCChkEn-
> 			MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
> 		HeaderLog: 00000000 00000000 00000000 00000000
> 	Capabilities: [300 v1] Virtual Channel
> 		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
> 		Arb:	Fixed- WRR32- WRR64- WRR128-
> 		Ctrl:	ArbSelect=Fixed
> 		Status:	InProgress-
> 		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
> 			Arb:	Fixed+ WRR32- WRR64- WRR128- TWRR128- WRR256-
> 			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
> 			Status:	NegoPending- InProgress-
> 	Capabilities: [400 v1] Power Budgeting <?>
> 	Capabilities: [500 v1] Vendor Specific Information: ID=1234 Rev=1 Len=100 <?>
> 	Capabilities: [600 v1] Vendor Specific Information: ID=8086 Rev=2 Len=04c <?>
> 	Capabilities: [700 v1] Secondary PCI Express
> 		LnkCtl3: LnkEquIntrruptEn- PerformEqu-
> 		LaneErrStat: 0
> 	Capabilities: [800 v1] Latency Tolerance Reporting
> 		Max snoop latency: 0ns
> 		Max no snoop latency: 0ns
> 	Capabilities: [a00 v1] L1 PM Substates
> 		L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
> 			  PortCommonModeRestoreTime=0us PortTPowerOnTime=10us
> 		L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
> 			   T_CommonMode=0us LTR1.2_Threshold=0ns
> 		L1SubCtl2: T_PwrOn=10us
> 	Capabilities: [b00 v1] Precision Time Measurement
> 		PTMCap: Requester:- Responder:- Root:-
> 		PTMClockGranularity: Unimplemented
> 		PTMControl: Enabled:+ RootSelected:-

At least this shows a similar issue we fixed for Barlow Ridge.

I don't have Titan Ridge host here so cannot try to repro but I wonder if
you could still try with CONFIG_PCIE_PTM=n and see if that changes
anything? Of course assuming you get the Linux installation working again.