Hello,

On Mon, 2021-08-02 at 11:14 -0700, Bhaumik Bhatt wrote:
> On 2021-08-02 09:33 AM, Loic Poulain wrote:
> > > > On Fri, 30 Jul 2021 at 19:52, Thomas Perrot <
> > > > thomas.perrot@bootlin.com> wrote:
> > > > > 
> > > > > Hello,
> > > > > 
> > > > > I’m trying to use the MHI driver with a Sierra Wireless
> > > > > AirPrime
> > > > > EM919X
> > > > > connected to an NXP i.MX6DL through a PCIe gen2 bus, on 5.13.6,
> > > > > but
> > > > > the
> > > > > device initialisation fails, as follows:
> > > > > 
> > > > > [    3.029401] mhi-pci-generic 0000:01:00.0: BAR 0: assigned
> > > > > [mem
> > > > > 0x01100000-0x01100fff 64bit]
> > > > > [    3.041095] mhi-pci-generic 0000:01:00.0: enabling device
> > > > > (0140 ->
> > > > > 0142)
> > > > > [    3.118299] mhi mhi0: Requested to power ON
> > > > > [   11.370361] mhi mhi0: Power on setup success
> > > > > [   11.372503] mhi mhi0: Wait for device to enter SBL or
> > > > > Mission mode
> > > > > [   15.664068] mhi-pci-generic 0000:01:00.0: failed to suspend
> > > > > device:
> > > > > -16
> > > > > [   22.619948] mhi-pci-generic 0000:01:00.0: refused to change
> > > > > power
> > > > > state from D3hot to D0
> > > > > [   57.289998] mhi-pci-generic 0000:01:00.0: can't change power
> > > > > state
> > > > > from D3hot to D0 (config space inaccessible)
> > > > > [   73.769675] mhi-pci-generic 0000:01:00.0: can't change power
> > > > > state
> > > > > from D3cold to D0 (config space inaccessible)
> > > > > [   73.780188] mhi-pci-generic 0000:01:00.0: can't change power
> > > > > state
> > > > > from D3hot to D0 (config space inaccessible)
> > > > > [   73.836150] PC is at mhi_pci_read_reg+0xc/0x14
> > > > > [   73.840642] LR is at mhi_get_mhi_state+0x2c/0x5c
> > > > > [   74.121120] [<c05dcaf4>] (mhi_pci_read_reg) from
> > > > > [<c05d754c>]
> > > > > (mhi_get_mhi_state+0x2c/0x5c)
> > > > > [   74.129529] [<c05d754c>] (mhi_get_mhi_state) from
> > > > > [<c05da440>]
> > > > > (mhi_pm_resume+0x38/0x298)
> > > > > [   74.137754] [<c05da440>] (mhi_pm_resume) from [<c05dcbd0>]
> > > > > (mhi_pci_runtime_resume+0x70/0xe0)
> > > > > [   74.146326] [<c05dcbd0>] (mhi_pci_runtime_resume) from
> > > > > [<c0604da0>]
> > > > > (pci_pm_runtime_resume+0x84/0xa0)
> > > > > 
> > > > > Do you have any idea where the issue might come from?
> > > > > 
> > > > > MHI seems to enter in READY state and waiting to enter in SBL
> > > > > or
> > > > > Mission mode when the issue occurs, the host can start MHI
> > > > > initialization by programming MMIO registers and sets the
> > > > > device into
> > > > > MHI_M0 state.
> > > > 
> > > > runtime-pm is only enabled when the device is in mission mode, so
> > > > the
> > > > device has likely been successfully initialized, It is just that
> > > > there
> > > > is no info message indicating initialization completion and we
> > > > should
> > > > probably add that. I think maybe about some PCIe suspend/resume
> > > > issues, could you try disabling runtime-pm for that device? or
> > > > simply
> > > > comment `pm_runtime_allow` call?
> > > 
> > > Thanks for your help, I disabled the power management, I obtains
> > > the
> > > following trace:
> > > 
> > > [    0.000000] Booting Linux on physical CPU 0x0
> > > [    0.000000] Linux version 5.13.6 (arm-oe-linux-gnueabi-gcc (GCC)
> > > 9.2.0, GNU ld (GNU Binutils) 2.32.0.20190204) #1 SMP Mon Aug 2 
> > > 14:27:03
> > > UTC 2021
> > > [    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7),
> > > cr=10c5387d
> > > [    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT
> > > aliasing
> > > instruction cache
> > > [    0.000000] OF: fdt: Machine model: i.MX6 Duallite module
> > > [    0.000000] Memory policy: Data cache writealloc
> > > [    0.000000] cma: Reserved 64 MiB at 0x4c000000
> > > [    0.000000] Zone ranges:
> > > [    0.000000]   Normal   [mem 0x0000000010000000-
> > > 0x000000003fffffff]
> > > [    0.000000]   HighMem  [mem 0x0000000040000000-
> > > 0x000000004fffffff]
> > > [    0.000000] Movable zone start for each node
> > > [    0.000000] Early memory node ranges
> > > [    0.000000]   node   0: [mem 0x0000000010000000-
> > > 0x000000004fffffff]
> > > [    0.000000] Initmem setup node 0 [mem 0x0000000010000000-
> > > 0x000000004fffffff]
> > > [    0.000000] On node 0 totalpages: 262144
> > > [    0.000000]   Normal zone: 1536 pages used for memmap
> > > [    0.000000]   Normal zone: 0 pages reserved
> > > [    0.000000]   Normal zone: 196608 pages, LIFO batch:63
> > > [    0.000000]   HighMem zone: 65536 pages, LIFO batch:15
> > > [    0.000000] percpu: Embedded 20 pages/cpu s52396 r8192 d21332 
> > > u81920
> > > [    0.000000] pcpu-alloc: s52396 r8192 d21332 u81920 alloc=20*4096
> > > [    0.000000] pcpu-alloc: [0] 0 [0] 1
> > > [    0.000000] Built 1 zonelists, mobility grouping on.  Total
> > > pages:
> > > 260608
> > > [    0.000000] Kernel command line: console=ttymxc3,115200n8 
> > > loglevel=8
> > > root=/dev/nfs ip=10.0.0.2:255.255.255.0
> > > nfsroot=10.0.0.1:/var/lib/nfsboot,v4,tcp
> > > [    0.000000] Dentry cache hash table entries: 131072 (order: 7,
> > > 524288 bytes, linear)
> > > [    0.000000] Inode-cache hash table entries: 65536 (order: 6,
> > > 262144
> > > bytes, linear)
> > > [    0.000000] mem auto-init: stack:off, heap alloc:off, heap
> > > free:off
> > > [    0.000000] Memory: 945728K/1048576K available (13312K kernel
> > > code,
> > > 1910K rwdata, 4228K rodata, 1024K init, 6621K bss, 37312K reserved,
> > > 65536K cma-reserved, 196608K highmem)
> > > [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2,
> > > Nodes=1
> > > [    0.000000] trace event string verifier disabled
> > > [    0.000000] Running RCU self tests
> > > [    0.000000] rcu: Hierarchical RCU implementation.
> > > [    0.000000] rcu:     RCU event tracing is enabled.
> > > [    0.000000] rcu:     RCU lockdep checking is enabled.
> > > [    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=4 to
> > > nr_cpu_ids=2.
> > > [    0.000000] rcu: RCU calculated value of scheduler-enlistment
> > > delay
> > > is 10 jiffies.
> > > [    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16,
> > > nr_cpu_ids=2
> > > [    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
> > > [    0.000000] L2C-310 erratum 769419 enabled
> > > [    0.000000] L2C-310 enabling early BRESP for Cortex-A9
> > > [    0.000000] L2C-310 full line of zeros enabled for Cortex-A9
> > > [    0.000000] L2C-310 ID prefetch enabled, offset 16 lines
> > > [    0.000000] L2C-310 dynamic clock gating enabled, standby mode
> > > enabled
> > > [    0.000000] L2C-310 cache controller enabled, 16 ways, 512 kB
> > > [    0.000000] L2C-310: CACHE_ID 0x410000c8, AUX_CTRL 0x76450001
> > > [    0.000000] random: get_random_bytes called from
> > > start_kernel+0x364/0x58c with crng_init=0
> > > [    0.000000] Switching to timer-based delay loop, resolution
> > > 333ns
> > > [    0.000001] sched_clock: 32 bits at 3000kHz, resolution 333ns,
> > > wraps
> > > every 715827882841ns
> > > [    0.000033] clocksource: mxc_timer1: mask: 0xffffffff
> > > max_cycles:
> > > 0xffffffff, max_idle_ns: 637086815595 ns
> > > [    0.001600] Console: colour dummy device 80x30
> > > [    0.001663] Lock dependency validator: Copyright (c) 2006 Red
> > > Hat,
> > > Inc., Ingo Molnar
> > > [    0.001685] ... MAX_LOCKDEP_SUBCLASSES:  8
> > > [    0.001703] ... MAX_LOCK_DEPTH:          48
> > > [    0.001721] ... MAX_LOCKDEP_KEYS:        8192
> > > [    0.001742] ... CLASSHASH_SIZE:          4096
> > > [    0.001760] ... MAX_LOCKDEP_ENTRIES:     32768
> > > [    0.001777] ... MAX_LOCKDEP_CHAINS:      65536
> > > [    0.001795] ... CHAINHASH_SIZE:          32768
> > > [    0.001812]  memory used by lock dependency info: 4061 kB
> > > [    0.001831]  memory used for stack traces: 2112 kB
> > > [    0.001849]  per task-struct memory footprint: 1536 bytes
> > > [    0.001979] Calibrating delay loop (skipped), value calculated
> > > using
> > > timer frequency.. 6.00 BogoMIPS (lpj=30000)
> > > [    0.002020] pid_max: default: 32768 minimum: 301
> > > [    0.002324] Mount-cache hash table entries: 2048 (order: 1, 8192
> > > bytes, linear)
> > > [    0.002375] Mountpoint-cache hash table entries: 2048 (order: 1,
> > > 8192 bytes, linear)
> > > [    0.006205] CPU: Testing write buffer coherency: ok
> > > [    0.006386] CPU0: Spectre v2: using BPIALL workaround
> > > [    0.007450] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
> > > [    0.010927] Setting up static identity map for 0x10100000 -
> > > 0x10100078
> > > [    0.011749] rcu: Hierarchical SRCU implementation.
> > > [    0.013800] smp: Bringing up secondary CPUs ...
> > > [    0.017275] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
> > > [    0.017300] CPU1: Spectre v2: using BPIALL workaround
> > > [    0.018621] smp: Brought up 1 node, 2 CPUs
> > > [    0.018660] SMP: Total of 2 processors activated (12.00
> > > BogoMIPS).
> > > [    0.018691] CPU: All CPU(s) started in SVC mode.
> > > [    0.022001] devtmpfs: initialized
> > > [    0.061678] VFP support v0.3: implementor 41 architecture 3 part
> > > 30
> > > variant 9 rev 4
> > > [    0.064662] clocksource: jiffies: mask: 0xffffffff max_cycles:
> > > 0xffffffff, max_idle_ns: 19112604462750000 ns
> > > [    0.064755] futex hash table entries: 512 (order: 3, 32768
> > > bytes,
> > > linear)
> > > [    0.068750] pinctrl core: initialized pinctrl subsystem
> > > [    0.075244] NET: Registered protocol family 16
> > > [    0.102637] DMA: preallocated 256 KiB pool for atomic coherent
> > > allocations
> > > [    0.108783] thermal_sys: Registered thermal governor 'step_wise'
> > > [    0.109361] cpuidle: using governor menu
> > > [    0.109609] NET: Registered protocol family 42
> > > [    0.110336] CPU identified as i.MX6DL, silicon rev 1.3
> > > [    0.157666] vdd1p1: supplied by regulator-dummy
> > > [    0.160738] vdd3p0: supplied by regulator-dummy
> > > [    0.163009] vdd2p5: supplied by regulator-dummy
> > > [    0.166539] vddpu: supplied by regulator-dummy
> > > [    0.204081] platform 2400000.ipu: Fixing up cyclic dependency
> > > with
> > > 20e0000.iomuxc-gpr:ipu1_csi1_mux
> > > [    0.204560] platform 2400000.ipu: Fixing up cyclic dependency
> > > with
> > > 20e0000.iomuxc-gpr:ipu1_csi0_mux
> > > [    0.216152] No ATAGs?
> > > [    0.216575] hw-breakpoint: found 5 (+1 reserved) breakpoint and
> > > 1
> > > watchpoint registers.
> > > [    0.216689] hw-breakpoint: maximum watchpoint size is 4 bytes.
> > > [    0.218287] debugfs: Directory 'dummy-iomuxc-gpr@20e0000' with
> > > parent 'regmap' already present!
> > > [    0.219892] imx6dl-pinctrl 20e0000.pinctrl: initialized IMX
> > > pinctrl
> > > driver
> > > [    0.336589] mxs-dma 110000.dma-apbh: initialized
> > > [    0.366282] vgaarb: loaded
> > > [    0.368879] SCSI subsystem initialized
> > > [    0.369795] libata version 3.00 loaded.
> > > [    0.371044] usbcore: registered new interface driver usbfs
> > > [    0.371350] usbcore: registered new interface driver hub
> > > [    0.371534] usbcore: registered new device driver usb
> > > [    0.372134] usb_phy_generic usbphynop1: supply vcc not found,
> > > using
> > > dummy regulator
> > > [    0.373424] usb_phy_generic usbphynop2: supply vcc not found,
> > > using
> > > dummy regulator
> > > [    0.380083] i2c i2c-1: IMX I2C adapter registered
> > > [    0.381434] pps_core: LinuxPPS API ver. 1 registered
> > > [    0.381470] pps_core: Software ver. 5.3.6 - Copyright 2005-2007
> > > Rodolfo Giometti <giometti@linux.it>
> > > [    0.381551] PTP clock support registered
> > > [    0.386332] Bluetooth: Core ver 2.22
> > > [    0.386506] NET: Registered protocol family 31
> > > [    0.386535] Bluetooth: HCI device and connection manager 
> > > initialized
> > > [    0.386695] Bluetooth: HCI socket layer initialized
> > > [    0.386748] Bluetooth: L2CAP socket layer initialized
> > > [    0.386945] Bluetooth: SCO socket layer initialized
> > > [    0.391017] clocksource: Switched to clocksource mxc_timer1
> > > [    0.763351] VFS: Disk quotas dquot_6.6.0
> > > [    0.763583] VFS: Dquot-cache hash table entries: 1024 (order 0, 
> > > 4096
> > > bytes)
> > > [    0.800699] NET: Registered protocol family 2
> > > [    0.801465] IP idents hash table entries: 16384 (order: 5,
> > > 131072
> > > bytes, linear)
> > > [    0.805081] tcp_listen_portaddr_hash hash table entries: 512 
> > > (order:
> > > 2, 22528 bytes, linear)
> > > [    0.805228] TCP established hash table entries: 8192 (order: 3,
> > > 32768 bytes, linear)
> > > [    0.805411] TCP bind hash table entries: 8192 (order: 6, 327680
> > > bytes, linear)
> > > [    0.806559] TCP: Hash tables configured (established 8192 bind
> > > 8192)
> > > [    0.807250] UDP hash table entries: 512 (order: 3, 49152 bytes,
> > > linear)
> > > [    0.807475] UDP-Lite hash table entries: 512 (order: 3, 49152 
> > > bytes,
> > > linear)
> > > [    0.808140] NET: Registered protocol family 1
> > > [    0.811976] RPC: Registered named UNIX socket transport module.
> > > [    0.812100] RPC: Registered udp transport module.
> > > [    0.812129] RPC: Registered tcp transport module.
> > > [    0.812155] RPC: Registered tcp NFSv4.1 backchannel transport
> > > module.
> > > [    0.814412] PCI: CLS 0 bytes, default 64
> > > [    0.815722] armv7-pmu pmu: hw perfevents: no interrupt-affinity
> > > property, guessing.
> > > [    1.395389] hw perfevents: enabled with armv7_cortex_a9 PMU
> > > driver,
> > > 7 counters available
> > > [    1.401550] Initialise system trusted keyrings
> > > [    1.402567] workingset: timestamp_bits=30 max_order=18
> > > bucket_order=0
> > > [    1.431576] NFS: Registering the id_resolver key type
> > > [    1.431773] Key type id_resolver registered
> > > [    1.431892] Key type id_legacy registered
> > > [    1.432131] jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
> > > [    1.434360] fuse: init (API version 7.34)
> > > [    1.538869] Key type asymmetric registered
> > > [    1.539043] Asymmetric key parser 'x509' registered
> > > [    1.539425] bounce: pool size: 64 pages
> > > [    1.539666] io scheduler mq-deadline registered
> > > [    1.539706] io scheduler kyber registered
> > > [    1.546350] imx6q-pcie 1ffc000.pcie: host bridge 
> > > /soc/pcie@1ffc000
> > > ranges:
> > > [    1.546683] imx6q-pcie 1ffc000.pcie:       IO
> > > 0x0001f80000..0x0001f8ffff -> 0x0000000000
> > > [    1.546998] imx6q-pcie 1ffc000.pcie:      MEM
> > > 0x0001000000..0x0001efffff -> 0x0001000000
> > > [    1.561233] imx-sdma 20ec000.sdma: Direct firmware load for
> > > imx/sdma/sdma-imx6q.bin failed with error -2
> > > [    1.561380] imx-sdma 20ec000.sdma: Falling back to sysfs
> > > fallback
> > > for: imx/sdma/sdma-imx6q.bin
> > > [    1.576583] pfuze100-regulator 1-0008: Full layer: 2, Metal
> > > layer: 
> > > 1
> > > [    1.577276] pfuze100-regulator 1-0008: FAB: 0, FIN: 0
> > > [    1.577316] pfuze100-regulator 1-0008: pfuze100 found.
> > > [    1.608012] 21f0000.serial: ttymxc3 at MMIO 0x21f0000 (irq = 72,
> > > base_baud = 5000000) is a IMX
> > > [    1.662256] imx6q-pcie 1ffc000.pcie: iATU unroll: disabled
> > > [    1.662287] imx6q-pcie 1ffc000.pcie: Detected iATU regions: 4
> > > outbound, 4 inbound
> > > [    1.962914] imx6q-pcie 1ffc000.pcie: Link up
> > > [    2.061645] imx6q-pcie 1ffc000.pcie: Link up
> > > [    2.061667] imx6q-pcie 1ffc000.pcie: Link up, Gen2
> > > [    2.061687] imx6q-pcie 1ffc000.pcie: Link up
> > > [    2.062985] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus
> > > 0000:00
> > > [    2.063019] pci_bus 0000:00: root bus resource [bus 00-ff]
> > > [    2.063044] pci_bus 0000:00: root bus resource [io  0x0000-
> > > 0xffff]
> > > [    2.063067] pci_bus 0000:00: root bus resource [mem 0x01000000-
> > > 0x01efffff]
> > > [    2.063496] pci 0000:00:00.0: [16c3:abcd] type 01 class 0x060400
> > > [    2.063572] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-
> > > 0x000fffff]
> > > [    2.063637] pci 0000:00:00.0: reg 0x38: [mem 0x00000000-
> > > 0x0000ffff
> > > pref]
> > > [    2.063745] pci 0000:00:00.0: Limiting cfg_size to 512
> > > [    2.064120] pci 0000:00:00.0: supports D1
> > > [    2.064138] pci 0000:00:00.0: PME# supported from D0 D1 D3hot 
> > > D3cold
> > > [    2.068753] PCI: bus0: Fast back to back transfers disabled
> > > [    2.069419] pci 0000:01:00.0: [17cb:0306] type 00 class 0xff0000
> > > [    2.069550] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-
> > > 0x00000fff
> > > 64bit]
> > > [    2.069633] pci 0000:01:00.0: reg 0x18: [mem 0x00000000-
> > > 0x00000fff
> > > 64bit]
> > > [    2.070265] pci 0000:01:00.0: PME# supported from D0 D3hot
> > > D3cold
> > > [    2.070437] pci 0000:01:00.0: 4.000 Gb/s available PCIe
> > > bandwidth,
> > > limited by 5.0 GT/s PCIe x1 link at 0000:00:00.0 (capable of 31.506
> > > Gb/s with 16.0 GT/s PCIe x2 link)
> > > [    2.074462] PCI: bus1: Fast back to back transfers disabled
> > > [    2.076179] printk: console [ttymxc3] enabled
> > > [    2.079173] pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000-
> > > 0x010fffff]
> > > [    2.702298] pci 0000:00:00.0: BAR 8: assigned [mem 0x01100000-
> > > 0x011fffff]
> > > [    2.709133] pci 0000:00:00.0: BAR 6: assigned [mem 0x01200000-
> > > 0x0120ffff pref]
> > > [    2.716589] pci 0000:01:00.0: BAR 0: assigned [mem 0x01100000-
> > > 0x01100fff 64bit]
> > > [    2.724097] pci 0000:01:00.0: BAR 2: assigned [mem 0x01101000-
> > > 0x01101fff 64bit]
> > > [    2.725446] etnaviv etnaviv: bound 130000.gpu (ops gpu_ops)
> > > [    2.731578] pci 0000:00:00.0: PCI bridge to [bus 01-ff]
> > > [    2.738177] etnaviv etnaviv: bound 134000.gpu (ops gpu_ops)
> > > [    2.742511] pci 0000:00:00.0:   bridge window [mem 0x01100000-
> > > 0x011fffff]
> > > [    2.748092] etnaviv-gpu 130000.gpu: model: GC880, revision: 5106
> > > [    2.755855] mhi-pci-generic 0000:01:00.0: MHI PCI device found:
> > > qcom-sdx55m
> > > [    2.768315] mhi-pci-generic 0000:01:00.0: BAR 0: assigned [mem
> > > 0x01100000-0x01100fff 64bit]
> > > [    2.769015] etnaviv-gpu 134000.gpu: model: GC320, revision: 5007
> > > [    2.776912] mhi-pci-generic 0000:01:00.0: enabling device (0140
> > > ->
> > > 0142)
> > > [    2.786483] [drm] Initialized etnaviv 1.3.0 20151214 for etnaviv
> > > on
> > > minor 0
> > > [    2.801751] mhi mhi0: Requested to power ON
> > > [    2.808489] mhi mhi0: Power on setup success
> > > [    2.810346] imx-drm display-subsystem: bound imx-ipuv3-crtc.2
> > > (ops
> > > ipu_crtc_ops)
> > > [    2.821931] imx-drm display-subsystem: bound imx-ipuv3-crtc.3
> > > (ops
> > > ipu_crtc_ops)
> > > [    2.831489] [drm] Initialized imx-drm 1.0.0 20120507 for
> > > display-
> > > subsystem on minor 1
> > > [    2.839891] imx-ipuv3 2400000.ipu: IPUv3H probed
> > > [    2.891577] brd: module loaded
> > > [    2.939853] loop: module loaded
> > > [    2.951691] spi@0 enforce active low on chipselect handle
> > > [    2.957268] spi@1 enforce active low on chipselect handle
> > > [    2.972776] spi@0 enforce active low on chipselect handle
> > > [    2.978398] spi@1 enforce active low on chipselect handle
> > > [    2.994315] libphy: Fixed MDIO Bus: probed
> > > [    3.000604] CAN device driver interface
> > > [    3.010081] pps pps0: new PPS source ptp0
> > > [    3.028687] libphy: fec_enet_mii_bus: probed
> > > [    3.036072] fec 2188000.ethernet eth0: registered PHC device 0
> > > [    3.044184] PPP generic driver version 2.4.2
> > > [    3.049501] PPP BSD Compression module registered
> > > [    3.054353] PPP Deflate Compression module registered
> > > [    3.059991] usbcore: registered new interface driver r8152
> > > [    3.065701] usbcore: registered new interface driver lan78xx
> > > [    3.071583] usbcore: registered new interface driver cdc_ether
> > > [    3.077562] usbcore: registered new interface driver cdc_eem
> > > [    3.083500] usbcore: registered new interface driver smsc95xx
> > > [    3.089413] usbcore: registered new interface driver net1080
> > > [    3.095293] usbcore: registered new interface driver cdc_subset
> > > [    3.101424] usbcore: registered new interface driver zaurus
> > > [    3.107144] usbcore: registered new interface driver MOSCHIP
> > > usb-
> > > ethernet driver
> > > [    3.114840] usbcore: registered new interface driver sierra_net
> > > [    3.121028] usbcore: registered new interface driver cdc_ncm
> > > [    3.126862] usbcore: registered new interface driver qmi_wwan
> > > [    3.132835] usbcore: registered new interface driver cdc_mbim
> > > [    3.138607] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI)
> > > Driver
> > > [    3.145209] ehci-pci: EHCI PCI platform driver
> > > [    3.149951] usbcore: registered new interface driver cdc_wdm
> > > [    3.155907] usbcore: registered new interface driver usb-storage
> > > [    3.162458] usbcore: registered new interface driver
> > > usbserial_generic
> > > [    3.169462] usbserial: USB Serial support registered for generic
> > > [    3.175898] usbcore: registered new interface driver ftdi_sio
> > > [    3.181889] usbserial: USB Serial support registered for FTDI
> > > USB
> > > Serial Device
> > > [    3.189345] usbcore: registered new interface driver option
> > > [    3.195086] usbserial: USB Serial support registered for GSM
> > > modem
> > > (1-port)
> > > [    3.202258] usbcore: registered new interface driver qcserial
> > > [    3.208119] usbserial: USB Serial support registered for
> > > Qualcomm
> > > USB modem
> > > [    3.233880] snvs_rtc 20cc000.snvs:snvs-rtc-lp: registered as
> > > rtc0
> > > [    3.240101] snvs_rtc 20cc000.snvs:snvs-rtc-lp: setting system
> > > clock
> > > to 1970-01-01T00:00:00 UTC (0)
> > > [    3.249753] i2c /dev entries driver
> > > [    3.268851] sdhci: Secure Digital Host Controller Interface
> > > driver
> > > [    3.275192] sdhci: Copyright(c) Pierre Ossman
> > > [    3.279581] sdhci-pltfm: SDHCI platform and OF driver helper
> > > [    3.289992] caam 2100000.crypto: Entropy delay = 3200
> > > [    3.331171] mmc1: SDHCI controller on 2194000.mmc [2194000.mmc]
> > > using ADMA
> > > [    3.338991] mmc2: SDHCI controller on 2198000.mmc [2198000.mmc]
> > > using ADMA
> > > [    3.356018] caam 2100000.crypto: Instantiated RNG4 SH0
> > > [    3.416778] caam 2100000.crypto: Instantiated RNG4 SH1
> > > [    3.422116] caam 2100000.crypto: device ID = 0x0a16010000000100 
> > > (Era
> > > 4)
> > > [    3.428768] caam 2100000.crypto: job rings = 2, qi = 0
> > > [    3.453774] mmc3: SDHCI controller on 219c000.mmc [219c000.mmc]
> > > using ADMA
> > > [    3.462624] mmc2: new DDR MMC card at address 0001
> > > [    3.473278] mmcblk2: mmc2:0001 00016G 14.6 GiB
> > > [    3.480232] mmcblk2boot0: mmc2:0001 00016G 4.00 MiB
> > > [    3.481917] caam algorithms registered in /proc/crypto
> > > [    3.487898] mmcblk2boot1: mmc2:0001 00016G 4.00 MiB
> > > [    3.498687] caam 2100000.crypto: registering rng-caam
> > > [    3.499061] mmcblk2rpmb: mmc2:0001 00016G 4.00 MiB, chardev
> > > (244:0)
> > > [    3.524714] usbcore: registered new interface driver usbhid
> > > [    3.530329] usbhid: USB HID core driver
> > > [    3.543229] Initializing XFRM netlink socket
> > > [    3.549810] NET: Registered protocol family 10
> > > [    3.551444] mmc3: new DDR MMC card at address 0001
> > > [    3.563454] Segment Routing with IPv6
> > > [    3.568381] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
> > > [    3.572261] mmcblk3: mmc3:0001 E0004G 3.64 GiB
> > > [    3.577406] NET: Registered protocol family 17
> > > [    3.579848] mmcblk3boot0: mmc3:0001 E0004G 4.00 MiB
> > > [    3.583595] NET: Registered protocol family 15
> > > [    3.589477] mmcblk3boot1: mmc3:0001 E0004G 4.00 MiB
> > > [    3.593057] can: controller area network core
> > > [    3.593470] NET: Registered protocol family 29
> > > [    3.603122] mmcblk3rpmb: mmc3:0001 E0004G 4.00 MiB, chardev
> > > (244:1)
> > > [    3.607179] can: raw protocol
> > > [    3.617067] can: broadcast manager protocol
> > > [    3.621569] can: netlink gateway - max_hops=1
> > > [    3.624307]  mmcblk3: p1 p2
> > > [    3.626619] Key type dns_resolver registered
> > > [    3.633579] random: fast init done
> > > [    3.643820] Registering SWP/SWPB emulation handler
> > > [    3.649438] Loading compiled-in X.509 certificates
> > > [    3.748476] random: crng init done
> > > [    3.821484] vddarm: supplied by SW1AB
> > > [    3.828699] vddsoc: supplied by SW1C
> > > [    4.431354] mhi mhi0: Wait for device to enter SBL or Mission
> > > mode
> > > [    4.453212] mxs_phy 20c9000.usbphy: Data pin can't make good
> > > contact.
> > > [    4.469544] ci_hdrc ci_hdrc.1: EHCI Host Controller
> > > [    4.475134] ci_hdrc ci_hdrc.1: new USB bus registered, assigned
> > > bus
> > > number 1
> > > [    4.511146] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
> > > [    4.518600] usb usb1: New USB device found, idVendor=1d6b,
> > > idProduct=0002, bcdDevice= 5.13
> > > [    4.527211] usb usb1: New USB device strings: Mfr=3, Product=2,
> > > SerialNumber=1
> > > [    4.534557] usb usb1: Product: EHCI Host Controller
> > > [    4.539469] usb usb1: Manufacturer: Linux 5.13.6 ehci_hcd
> > > [    4.544979] usb usb1: SerialNumber: ci_hdrc.1
> > > [    4.556250] hub 1-0:1.0: USB hub found
> > > [    4.560622] hub 1-0:1.0: 1 port detected
> > > [    4.590745] imx_thermal 20c8000.anatop:tempmon: Industrial CPU
> > > temperature grade - max:105C critical:100C passive:95C
> > > [    4.861299] usb 1-1: new high-speed USB device number 2 using
> > > ci_hdrc
> > > [    5.064624] usb 1-1: New USB device found, idVendor=04b4,
> > > idProduct=bd30, bcdDevice= 1.00
> > > [    5.073441] usb 1-1: New USB device strings: Mfr=0, Product=0,
> > > SerialNumber=0
> > > [    5.087382] hub 1-1:1.0: USB hub found
> > > [    5.091740] hub 1-1:1.0: 2 ports detected
> > > [    5.511390] usb 1-1.1: new high-speed USB device number 3 using
> > > ci_hdrc
> > > [    5.664449] usb 1-1.1: New USB device found, idVendor=04b4,
> > > idProduct=bd29, bcdDevice= 0.01
> > > [    5.673182] usb 1-1.1: New USB device strings: Mfr=1, Product=2,
> > > SerialNumber=3
> > > [    5.680706] usb 1-1.1: Product: Remote Download Wireless Adapter
> > > [    5.687033] usb 1-1.1: Manufacturer: Cypress Semiconductor Corp.
> > > [    5.693268] usb 1-1.1: SerialNumber: 000000000001
> > > [    5.801394] usb 1-1.2: new high-speed USB device number 4 using
> > > ci_hdrc
> > > [    5.955345] usb 1-1.2: New USB device found, idVendor=04b4,
> > > idProduct=640c, bcdDevice= 1.12
> > > [    5.964169] usb 1-1.2: New USB device strings: Mfr=1, Product=2,
> > > SerialNumber=3
> > > [    5.971823] usb 1-1.2: Product: BCM2045A0
> > > [    5.975900] usb 1-1.2: Manufacturer: Cypress Semiconductor Corp.
> > > [    5.982131] usb 1-1.2: SerialNumber: C0EE408051DF
> > > [   11.355278] mhi-pci-generic 0000:01:00.0: failed to power up MHI
> > > controller
> > > [   11.388118] mhi-pci-generic: probe of 0000:01:00.0 failed with
> > > error
> > > -110
> > 
> > Did you build MHI as builtin? maybe it's just a timeout issue, would
> > you be able to increase the timeout_ms value of the
> > mhi_controller_config in pci_generic from 8000ms to something like
> > 20000ms, just to be sure, I saw some modems taking a long to boot...
> > 
> > Regards,
> > Loic
> 
> As Loic suggested, I would just increase the timeout to 30 or 60
> seconds 
> to
> be sure.
> 

Thanks to both of you, to increase the timeout to 24000ms, in addition
to disabling the power management seems to correct the issue.

> You could also monitor changes in debugfs which can tell you what the
> registers read and get states at an interval of every second if you'd
> like.
> 
> watch -n 1 cat /sys/kernel/debug/mhi/mhi0/states
> watch -n 1 cat /sys/kernel/debug/mhi/mhi0/regdump
> 

root@target:~# cat /sys/kernel/debug/mhi/mhi0/states
PM state: M0 Device: Active MHI state: M0 EE: MISSION MODE wake: false
M0: 1 M2: 0 M3: 0 device wake: 0 pending packets: 0
root@target:~# cat /sys/kernel/debug/mhi/mhi0/regdump
Host PM state: M0 Device state: M0 EE: MISSION MODE
Device EE: MISSION MODE state: M0
MHI_REGLEN: 0x100
MHI_VER: 0x1000000
MHI_CFG: 0x2040080
MHI_CTRL: 0x200
MHI_STATUS: 0x201
MHI_WAKE_DB: 0x0
BHI_EXECENV: 0x2
BHI_STATUS: 0x0
BHI_ERRCODE: 0x0
BHI_ERRDBG1: 0x0
BHI_ERRDBG2: 0x0
BHI_ERRDBG3: 0x0

> You could start this after you load the kernel module to get most out
> of
> the debug rather than building as Y, just build as M as Loic
> suggested.

Really, thanks for helping and advising.

Best regards,
Thomas

> 
> Thanks,
> Bhaumik
> ---
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
> Forum,
> a Linux Foundation Collaborative Project

-- 
Thomas Perrot, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com