From: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
To: Kalle Valo <kvalo@codeaurora.org>
CC: Bjorn Helgaas <helgaas@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        Marc Zyngier <marc.zyngier@arm.com>,
        "Janusz.Dziedzic@tieto.com" <Janusz.Dziedzic@tieto.com>,
        "ath9k-devel@qca.qualcomm.com" <ath9k-devel@qca.qualcomm.com>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "rmanohar@qca.qualcomm.com" <rmanohar@qca.qualcomm.com>
Subject: RE: ATH9 driver issues on ARM64
Thread-Topic: ATH9 driver issues on ARM64
Thread-Index: AQHSUXmsKRFHQUL67ky5AgPY+zl5DKD/DqbA
Date: Fri, 9 Dec 2016 05:00:23 +0000
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Hi,
Can any one tell, when exactly the chip sends ASSERT & DEASSERT in driver.
It might help us to debug issue further.

Thanks & Regards,
Bharat 

> >  > [+cc Kalle, ath9k list]
> 
> Thanks, but please also CC linux-wireless. Full thread below for the folks there.
> 
> >> On Thu, Dec 08, 2016 at 01:49:42PM +0000, Bharat Kumar Gogada wrote:
> >> > Hi,
> >> >
> >> > Did anyone test Atheros ATH9
> >> > driver(drivers/net/wireless/ath/ath9k/)
> >> > on ARM64.  The end point is TP link wifi card with which supports
> >> > only legacy interrupts.
> >>
> >> If it works on other arches and the arm64 PCI enumeration works, my
> >> first guess would be an INTx issue, e.g., maybe the driver is waiting
> >> for an interrupt that never arrives.
> > We are not sure for now.
> >>
> >> > We are trying to test it on ARM64 with
> >> > (drivers/pci/host/pcie-xilinx-nwl.c) as root port.
> >> >
> >> > EP is getting enumerated and able to link up.
> >> >
> >> > But when we start scan system gets hanged.
> >>
> >> When you say the system hangs when you start a scan, I assume you
> >> mean a wifi scan, not the PCI enumeration.  A problem with a wifi
> >> scan might cause a *process* to hang, but it shouldn't hang the
> >> entire system.
> >>
> > Yes wifi scan.
> >> > When we took trace we see that after we start scan assert message
> >> > is sent but there is no de assert from end point.
> >>
> >> Are you talking about a trace from a PCIe analyzer?  Do you see an
> >> Assert_INTx PCIe message on the link?
> >>
> > Yes lecroy trace, yes we do see Assert_INTx and Deassert_INTx happening
> when we do interface link up.
> > When we have less debug prints in Atheros driver, and do wifi scan we
> > see Assert_INTx but never Deassert_INTx,
> >> > What might cause end point not sending de assert ?
> >>
> >> If the endpoint doesn't send a Deassert_INTx message, I expect that
> >> would mean the driver didn't service the interrupt and remove the
> >> condition that caused the device to assert the interrupt in the first
> >> place.
> >>
> >> If the driver didn't receive the interrupt, it couldn't service it,
> >> of course.  You could add a printk in the ath9k interrupt service
> >> routine to see if you ever get there.
> >>
> > The interrupt behavior is changing w.r.t amount of debug prints we
> > add. (I kept many prints to aid debug) root@Xilinx-ZCU102-2016_3:~# iw dev
> wlan0 scan
> > [   83.064675] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.069486] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.074257] ath9k_hw_kill_interrupts	 793
> > [   83.078260] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.083107] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.087882] ath9k_hw_kill_interrupts	 793
> > [   83.095450] ath9k_hw_enable_interrupts	 821
> > [   83.099557] ath9k_hw_enable_interrupts	 825
> > [   83.103721] ath9k_hw_enable_interrupts	 832
> > [   83.107887] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.112748] AR_SREV_9100 0
> > [   83.115438] ath9k_hw_enable_interrupts	 848
> > [   83.119607] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.124389] ath9k_hw_intrpend	 762
> > [   83.127761] (AR_SREV_9340(ah) val 0
> > [   83.131234] ath9k_hw_intrpend	 767
> > [   83.134628] ath_isr	 603
> > [   83.137134] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.141995] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.146771] ath9k_hw_kill_interrupts	 793
> > [   83.150864] ath9k_hw_enable_interrupts	 821
> > [   83.154971] ath9k_hw_enable_interrupts	 825
> > [   83.159135] ath9k_hw_enable_interrupts	 832
> > [   83.163300] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.168161] AR_SREV_9100 0
> > [   83.170852] ath9k_hw_enable_interrupts	 848
> > [   83.170855] ath9k_hw_intrpend	 762
> > [   83.178398] (AR_SREV_9340(ah) val 0
> > [   83.181873] ath9k_hw_intrpend	 767
> > [   83.185265] ath_isr	 603
> > [   83.187773] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.192635] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.197411] ath9k_hw_kill_interrupts	 793
> > [   83.201414] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.206258] ath9k_hw_enable_interrupts	 821
> > [   83.210368] ath9k_hw_enable_interrupts	 825
> > [   83.214531] ath9k_hw_enable_interrupts	 832
> > [   83.218698] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.223558] AR_SREV_9100 0
> > [   83.226243] ath9k_hw_enable_interrupts	 848
> > [   83.226246] ath9k_hw_intrpend	 762
> > [   83.233794] (AR_SREV_9340(ah) val 0
> > [   83.237268] ath9k_hw_intrpend	 767
> > [   83.240661] ath_isr	 603
> > [   83.243169] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.248030] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.252806] ath9k_hw_kill_interrupts	 793
> > [   83.256811] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.261651] ath9k_hw_enable_interrupts	 821
> > [   83.265753] ath9k_hw_enable_interrupts	 825
> > [   83.269919] ath9k_hw_enable_interrupts	 832
> > [   83.274083] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.278945] AR_SREV_9100 0
> > [   83.281630] ath9k_hw_enable_interrupts	 848
> > [   83.281633] ath9k_hw_intrpend	 762
> > [   83.281634] (AR_SREV_9340(ah) val 0
> > [   83.281637] ath9k_hw_intrpend	 767
> > [   83.281648] ath_isr	 603
> > [   83.281649] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.281651] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.281654] ath9k_hw_kill_interrupts	 793
> > [   83.312192] ath9k: ath9k_ioread32 ffffff800a400024
> > [   83.317030] ath9k_hw_enable_interrupts	 821
> > [   83.321132] ath9k_hw_enable_interrupts	 825
> > [   83.325297] ath9k_hw_enable_interrupts	 832
> > [   83.329463] ath9k: ath9k_iowrite32 ffffff800a400024
> > [   83.334324] AR_SREV_9100 0
> > [   83.337014] ath9k_hw_enable_interrupts	 848
> > ..
> > ..
> > This log continues until I turn off board without obtaining scanning result.
> >
> > In between I get following cpu stall outputs :
> >   230.457179] INFO: rcu_sched self-detected stall on CPU
> > [  230.457185] 	2-...: (31314 ticks this GP)
> idle=2d1/140000000000001/0 softirq=1400/1400 fqs=36713
> > [  230.457189] 	 (t=36756 jiffies g=161 c=160 q=16169)
> > [  230.457191] Task dump for CPU 2:
> > [  230.457196] kworker/u8:4    R  running task        0  1342      2 0x00000002
> > [  230.457207] Workqueue: phy0 ieee80211_scan_work [  230.457208] Call
> > trace:
> > [  230.457214] [<ffffff8008089860>] dump_backtrace+0x0/0x198 [
> > 230.457219] [<ffffff8008089a0c>] show_stack+0x14/0x20 [  230.457224]
> > [<ffffff80080c0930>] sched_show_task+0x98/0xf8 [  230.457228]
> > [<ffffff80080c2628>] dump_cpu_task+0x40/0x50 [  230.457233]
> > [<ffffff80080e14a8>] rcu_dump_cpu_stacks+0xa0/0xf0 [  230.457239]
> > [<ffffff80080e4cd8>] rcu_check_callbacks+0x468/0x748 [  230.457243]
> > [<ffffff80080e7cfc>] update_process_times+0x3c/0x68 [  230.457249]
> > [<ffffff80080f6dfc>] tick_sched_handle.isra.5+0x3c/0x50
> > [  230.457253] [<ffffff80080f6e54>] tick_sched_timer+0x44/0x90 [
> > 230.457257] [<ffffff80080e86b0>] __hrtimer_run_queues+0xf0/0x178
> > ** 10 printk messages dropped ** [  230.457302] f8c0: 0000000000000000
> > 0000000005f5e0ff 000000000001379a 3866666666666620 [  230.457306]
> > f8e0: ffffff800a1b4065 0000000000000006 ffffff800a129000
> > ffffffc87b8010a8 [  230.457310] f900: ffffff808a1b4057
> > ffffff800a1c3000 ffffff800a1b3000 ffffff800a13b000 [  230.457314]
> > f920: 0000000000000140 0000000000000006 ffffff800a1b3b10
> > ffffff800a1c39e8 [  230.457318] f940: 000000000000002f
> > ffffff800a1b8a98 ffffff800a1b3ae8 ffffffc87b07f990 [  230.457322]
> > f960: ffffff80080d6230 ffffffc87b07f990 ffffff80080d6234
> > 0000000060000145
> > ** 1 printk messages dropped ** [  230.457329] [<ffffff8008085720>]
> > el1_irq+0xa0/0x100
> > ** 9 printk messages dropped ** [  230.457373] [<ffffff800885ad60>]
> > ieee80211_hw_config+0x50/0x290 [  230.457377] [<ffffff8008863690>]
> > ieee80211_scan_work+0x1f8/0x480 [  230.457383] [<ffffff80080b15d0>]
> > process_one_work+0x120/0x378 [  230.457386] [<ffffff80080b1870>]
> > worker_thread+0x48/0x4b0 [  230.457391] [<ffffff80080b7108>]
> > kthread+0xd0/0xe8 [  230.457395] [<ffffff8008085dd0>]
> ret_from_fork+0x10/0x40
> > [  230.480389] ath9k_hw_intrpend	 762
> >
> >
> > [  545.487987] ath9k: ath9k_ioread32 ffffff800a400024 [  545.526189]
> > INFO: rcu_sched self-detected stall on CPU
> > [  545.526195] 	2-...: (97636 ticks this GP)
> idle=2d1/140000000000001/0 softirq=1400/1400 fqs=115374
> > [  545.526199] 	 (t=115523 jiffies g=161 c=160 q=51066)
> > [  545.526201] Task dump for CPU 2:
> > [  545.526206] kworker/u8:4    R  running task        0  1342      2 0x00000002
> > ** 3 printk messages dropped ** [  545.526231] [<ffffff8008089a0c>]
> > show_stack+0x14/0x20
> > ** 9 printk messages dropped ** [  545.526280] [<ffffff80086a71e8>]
> > arch_timer_handler_phys+0x30/0x40 [  545.526284] [<ffffff80080dbe18>]
> > handle_percpu_devid_irq+0x78/0xa0 [  545.526291] [<ffffff80080d760c>]
> > generic_handle_irq+0x24/0x38 [  545.526296] [<ffffff80080d7944>]
> > __handle_domain_irq+0x5c/0xb8 [  545.526299] [<ffffff80080824bc>]
> > gic_handle_irq+0x64/0xc0 [  545.526302] Exception stack(0xffffffc87b07f870
> to 0xffffffc87b07f990)
> > [  545.526306] f860:                                   0000000000009732 ffffff800a1eaaa8
> > ** 8 printk messages dropped ** [  545.526341] f980: ffffff800a1c39e8
> > 0000000000000036 [  545.526345] [<ffffff8008085720>]
> > el1_irq+0xa0/0x100 [  545.526349] [<ffffff80080d6234>]
> > console_unlock+0x384/0x5b0 [  545.526353] [<ffffff80080d673c>]
> > vprintk_emit+0x2dc/0x4b0 [  545.526357] [<ffffff80080d6a50>]
> > vprintk_default+0x38/0x40 [  545.526362] [<ffffff8008129704>]
> > printk+0x58/0x60 [  545.526366] [<ffffff800859e3e4>]
> > ath9k_iowrite32+0x9c/0xa8 [  545.526372] [<ffffff80085c7ca8>]
> > ath9k_hw_kill_interrupts+0x28/0xf0
> > [  545.526376] [<ffffff80085a18ec>] ath_reset+0x24/0x68
> > ** 2 printk messages dropped ** [  545.526391] [<ffffff800885ad60>]
> ieee80211_hw_config+0x50/0x290
> > ** 11 printk messages dropped ** [  545.532834] ath9k_hw_kill_interrupts
> 	 793
> > [  545.532890] ath9k_hw_enable_interrupts	 821
> >
> >
> > But if we have less debug prints it does not reach EP handler
> > sometimes, due to following Condition in "kernel/irq/chip.c" in
> > function handle_simple_irq
> >
> > if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
> >                 desc->istate |= IRQS_PENDING;
> >                 goto out_unlock;
> >         }
> > Here irqd_irq_disabled is being set to 1.
> >
> > With lesser debug prints it stops after following prints:
> > root@Xilinx-ZCU102-2016_3:~# iw dev wlan0 scan
> > [   54.781045] ath9k_hw_kill_interrupts	 793
> > [   54.785007] ath9k_hw_kill_interrupts	 793
> > [   54.792535] ath9k_hw_enable_interrupts	 821
> > [   54.796642] ath9k_hw_enable_interrupts	 825
> > [   54.800807] ath9k_hw_enable_interrupts	 832
> > [   54.804973] AR_SREV_9100 0
> > [   54.807663] ath9k_hw_enable_interrupts	 848
> > [   54.811843] ath9k_hw_intrpend	 762
> > [   54.815211] (AR_SREV_9340(ah) val 0
> > [   54.818684] ath9k_hw_intrpend	 767
> > [   54.822078] ath_isr	 603
> > [   54.824587] ath9k_hw_kill_interrupts	 793
> > [   54.828601] ath9k_hw_enable_interrupts	 821
> > [   54.832750] ath9k_hw_enable_interrupts	 825
> > [   54.836916] ath9k_hw_enable_interrupts	 832
> > [   54.841082] AR_SREV_9100 0
> > [   54.843772] ath9k_hw_enable_interrupts	 848
> > [   54.843775] ath9k_hw_intrpend	 762
> > [   54.851319] (AR_SREV_9340(ah) val 0
> > [   54.854793] ath9k_hw_intrpend	 767
> > [   54.858185] ath_isr	 603
> > [   54.860696] ath9k_hw_kill_interrupts	 793
> > [   54.864776] ath9k_hw_enable_interrupts	 821
> > [   54.867061] ath9k_hw_kill_interrupts	 793
> > [   54.872870] ath9k_hw_enable_interrupts	 825
> > [   54.877036] ath9k_hw_enable_interrupts	 832
> > [   54.881202] AR_SREV_9100 0
> > [   54.883892] ath9k_hw_enable_interrupts	 848
> > [   75.963129] INFO: rcu_sched detected stalls on CPUs/tasks:
> > [   75.968602] 	0-...: (2 GPs behind) idle=9d5/140000000000001/0
> softirq=1103/1109 fqs=519
> > [   75.976675] 	(detected by 2, t=5274 jiffies, g=64, c=63, q=11)
> > [   75.982485] Task dump for CPU 0:
> > [   75.985696] ksoftirqd/0     R  running task        0     3      2 0x00000002
> > [   75.992726] Call trace:
> > [   75.995165] [<ffffff8008086b3c>] __switch_to+0xc4/0xd0
> > [   76.000281] [<ffffffc87b830500>] 0xffffffc87b830500
> > [  139.059027] INFO: rcu_sched detected stalls on CPUs/tasks:
> > [  139.064430] 	0-...: (2 GPs behind) idle=9d5/140000000000001/0
> softirq=1103/1109 fqs=2097
> > [  139.072593] 	(detected by 2, t=21049 jiffies, g=64, c=63, q=11)
> > [  139.078489] Task dump for CPU 0:
> > [  139.081700] ksoftirqd/0     R  running task        0     3      2 0x00000002
> > [  139.088731] Call trace:
> > [  139.091165] [<ffffff8008086b3c>] __switch_to+0xc4/0xd0 [
> > 139.096285] [<ffffffc87b830500>] 0xffffffc87b830500
> >
> >
> >> > We are not seeing any issues on 32-bit ARM platform and X86
> >> > platform.
> >>
> >> Can you collect a dmesg log (or, if the system hang means you can't
> >> collect that, a console log with "ignore_loglevel"), and "lspci -vv"
> >> output as root?  That should have clues about whether the INTx got
> >> routed correctly.  /proc/interrupts should also show whether we're
> >> receiving interrupts from the device.
> >
> > Here is the lspci output:
> > 00:00.0 PCI bridge: Xilinx Corporation Device d022 (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- <MAbort- >SERR- <PERR- INTx-
> > 	Latency: 0
> > 	Interrupt: pin A routed to IRQ 224
> > 	Bus: primary=00, secondary=01, subordinate=0c, sec-latency=0
> > 	I/O behind bridge: 00000000-00000fff
> > 	Memory behind bridge: e0000000-e00fffff
> > 	Prefetchable memory behind bridge: 00000000fff00000-
> 00000000000fffff
> > 	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- <SERR- <PERR-
> > 	BridgeCtl: Parity- SERR- NoISA- VGA- 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: [60] Express (v2) Root Port (Slot-), MSI 00
> > 		DevCap:	MaxPayload 256 bytes, PhantFunc 0
> > 			ExtTag- RBE+
> > 		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal-
> Unsupported-
> > 			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
> > 			MaxPayload 128 bytes, MaxReadReq 512 bytes
> > 		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
> TransPend+
> > 		LnkCap:	Port #0, Speed 5GT/s, Width x2, ASPM not supported,
> Exit Latency L0s unlimited, L1 unlimited
> > 			ClockPM- Surprise- LLActRep- BwNot+ ASPMOptComp+
> > 		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk-
> > 			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> > 		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+
> DLActive- BWMgmt- ABWMgmt-
> > 		RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna-
> CRSVisible+
> > 		RootCap: CRSVisible+
> > 		RootSta: PME ReqID 0000, PMEStatus- PMEPending-
> > 		DevCap2: Completion Timeout: Range B, TimeoutDis+, LTR-,
> OBFF Not Supported ARIFwd-
> > 		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
> OBFF Disabled ARIFwd-
> > 		LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-
> > 			 Transmit Margin: Normal Operating Range,
> EnterModifiedCompliance- ComplianceSOS-
> > 			 Compliance De-emphasis: -6dB
> > 		LnkSta2: Current De-emphasis Level: -3.5dB,
> EqualizationComplete-, EqualizationPhase1-
> > 			 EqualizationPhase2-, EqualizationPhase3-,
> LinkEqualizationRequest-
> > 	Capabilities: [100 v1] Device Serial Number 00-00-00-00-00-00-00-00
> > 	Capabilities: [10c 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: [128 v1] Vendor Specific Information: ID=1234 Rev=1
> > Len=018 <?>
> >
> > 01:00.0 Network controller: Qualcomm Atheros AR93xx Wireless Network
> Adapter (rev 01)
> > 	Subsystem: Qualcomm Atheros Device 3112
> > 	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, Cache Line Size: 128 bytes
> > 	Interrupt: pin A routed to IRQ 224
> > 	Region 0: Memory at e0000000 (64-bit, non-prefetchable) [size=128K]
> > 	[virtual] Expansion ROM at e0020000 [disabled] [size=64K]
> > 	Capabilities: [40] 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: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
> > 		Address: 0000000000000000  Data: 0000
> > 		Masking: 00000000  Pending: 00000000
> > 	Capabilities: [70] Express (v2) Endpoint, MSI 00
> > 		DevCap:	MaxPayload 128 bytes, PhantFunc 0, Latency
> L0s <1us, L1 <8us
> > 			ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
> SlotPowerLimit 0.000W
> > 		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal-
> Unsupported-
> > 			RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
> > 			MaxPayload 128 bytes, MaxReadReq 512 bytes
> > 		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
> TransPend-
> > 		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit
> Latency L0s <2us, L1 <64us
> > 			ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
> > 		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk-
> > 			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> > 		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+
> DLActive- BWMgmt- ABWMgmt-
> > 		DevCap2: Completion Timeout: Not Supported, TimeoutDis+,
> LTR-, OBFF Not Supported
> > 		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
> OBFF Disabled
> > 		LnkCtl2: Target Link Speed: 2.5GT/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: [100 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-
> NonFatalErr-
> > 		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout-
> NonFatalErr+
> > 		AERCap:	First Error Pointer: 00, GenCap- CGenEn-
> ChkCap- ChkEn-
> > 	Capabilities: [140 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: [300 v1] Device Serial Number 00-00-00-00-00-00-00-00
> > 	Kernel driver in use: ath9k
> >
> > Here is the cat /proc/interrupts (after we do interface up):
> >
> > root@:~# ifconfig wlan0 up
> > [ 1548.926601] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
> > root@Xilinx-ZCU102-2016_3:~# cat /proc/interrupts
> >            CPU0       CPU1       CPU2       CPU3
> >   1:          0          0          0          0     GICv2  29 Edge      arch_timer
> >   2:      19873      20058      19089      17435     GICv2  30 Edge      arch_timer
> >  12:          0          0          0          0     GICv2 156 Level     zynqmp-dma
> >  13:          0          0          0          0     GICv2 157 Level     zynqmp-dma
> >  14:          0          0          0          0     GICv2 158 Level     zynqmp-dma
> >  15:          0          0          0          0     GICv2 159 Level     zynqmp-dma
> >  16:          0          0          0          0     GICv2 160 Level     zynqmp-dma
> >  17:          0          0          0          0     GICv2 161 Level     zynqmp-dma
> >  18:          0          0          0          0     GICv2 162 Level     zynqmp-dma
> >  19:          0          0          0          0     GICv2 163 Level     zynqmp-dma
> >  20:          0          0          0          0     GICv2 164 Level     Mali_GP_MMU, Mali_GP,
> Mali_PP0_MMU, Mali_PP0, Mali_PP1_MMU, Mali_PP1
> >  30:          0          0          0          0     GICv2  95 Level     eth0, eth0
> > 206:        314          0          0          0     GICv2  49 Level     cdns-i2c
> > 207:         40          0          0          0     GICv2  50 Level     cdns-i2c
> > 209:          0          0          0          0     GICv2 150 Level     nwl_pcie:misc
> > 214:         12          0          0          0     GICv2  47 Level     ff0f0000.spi
> > 215:          0          0          0          0     GICv2  58 Level     ffa60000.rtc
> > 216:          0          0          0          0     GICv2  59 Level     ffa60000.rtc
> > 217:          0          0          0          0     GICv2 165 Level     ahci-ceva[fd0c0000.ahci]
> > 218:         61          0          0          0     GICv2  81 Level     mmc0
> > 219:          0          0          0          0     GICv2 187 Level     arm-smmu global fault
> > 220:        471          0          0          0     GICv2  53 Level     xuartps
> > 223:          0          0          0          0     GICv2 154 Level     fd4c0000.dma
> > 224:          3          0          0          0     dummy   1 Edge      ath9k
> > 225:          0          0          0          0     GICv2  97 Level     xhci-hcd:usb1
> >
> > Regards,
> > Bharat
> 
> --
> Kalle Valo