How to enable ASPM for jetson nano

I saw there is a segment stating how to enable ASPM in guide:

To enable ASPM support

1.Remove the following value from configs/_defconfig:

CONFIG_PCIEASPM

2.Add the following value:

CONFIG_PCIEASPM_POWERSAVE=y

Where  is described in the section Placeholders in Commands.

and I just checked the kernel configuration for ASPM in .conf (Note: I can not remove “CONFIG_PCIEASPM”, or the other ASPM configuration are disabled consequently):

CONFIG_PCIEASPM=y

CONFIG_PCIEASPM_DEBUG=y

# CONFIG_PCIEASPM_DEFAULT is not set

CONFIG_PCIEASPM_POWERSAVE=y

# CONFIG_PCIEASPM_PERFORMANCE is not set

then compiled and flashed my Jetson Nano device. After system rebooting, I checked the PCIE device list through command “lspci --vv” and found the ASPM of the externel nvme device was still disabled yet:

01:00.0 Non-Volatile memory controller: Device 1d79:2263 (rev 03) (prog-if 02 [NVM Express])

	Subsystem: Device 1d79:2263

	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+

	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- SERR- 
	Latency: 0

	Interrupt: pin A routed to IRQ 83

	Region 0: Memory at 13000000 (64-bit, non-prefetchable) [size=16K]

	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=1/8 Maskable+ 64bit+

		Address: 0000000000000000  Data: 0000

		Masking: 00000000  Pending: 00000000

	Capabilities: [70] Express (v2) Endpoint, MSI 00

		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited

			ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0.000W

		DevCtl:	Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+

			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop- FLReset-

			MaxPayload 128 bytes, MaxReadReq 512 bytes

		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-

		LnkCap:	Port #0, Speed 8GT/s, Width x4, **ASPM not supported**, Exit Latency L0s <1us, L1 <8us

			ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+

		LnkCtl:	**ASPM Disabled**; RCB 64 bytes Disabled- CommClk+

			ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-

		LnkSta:	Speed 5GT/s, Width x4, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

		DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR+, OBFF Not Supported

		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, OBFF Disabled

		LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-

			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-

			 Compliance De-emphasis: -6dB

		LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-

			 EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-

	Capabilities: [b0] MSI-X: Enable+ Count=16 Masked-

		Vector table: BAR=0 offset=00002000

		PBA: BAR=0 offset=00002100

	Capabilities: [100 v2] 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- NonFatalErr-

		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+

		AERCap:	First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-

	Capabilities: [158 v1] #19

	Capabilities: [178 v1] Latency Tolerance Reporting

		Max snoop latency: 0ns

		Max no snoop latency: 0ns

	Capabilities: [180 v1] L1 PM Substates

		L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+

			  PortCommonModeRestoreTime=10us PortTPowerOnTime=10us

		L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-

			   T_CommonMode=0us LTR1.2_Threshold=98304ns

		L1SubCtl2: T_PwrOn=70us

	Kernel driver in use: nvme

Then, I also tried appending attribute “pcie_aspm=force” into kernel commandline, but failed.

Could you give some adivce how to enable ASPM on Jetson Nano ?