Re: [PATCH 0/4] staging: mt7621-pci: Handle minor issues

[Greg Ungerer <gerg@kernel.org>]

Hi Sergio,

On 23/6/19 3:58 pm, Sergio Paracuellos wrote:
> On Sun, Jun 23, 2019 at 4:15 AM Brett Neumeier <bneumeier@gmail.com> wrote:
>> On Fri, Jun 21, 2019 at 7:35 AM Greg Ungerer <gerg@kernel.org> wrote:
>>> On 21/6/19 4:15 pm, Sergio Paracuellos wrote:
>>>> This patch series properly handle minor issues in this driver. These are:
>>>> * Disable pcie port clock on pci dirver instead of doing it in the phy
>>>>     driver. The pci driver is the correct place to do this.
>>>> * Add a missing call to phy_exit function to properly handle the function
>>>>     'mt7621_pcie_init_port' error path.
>>>> * Move driver to init in a later stage using 'module_init' instead of using
>>>>     'arch_initcall'.
>>>>
>>>> Patches are only compile-tested. It would be awasome to be tested before applied
>>>> them (mainly the change to 'module_init' stuff).
>>
>> I have similar results to Greg -- on GnuBee PC1 and PC2, six boot
>> attempts each on a kernel built from staging-next, I have four hangs
>> and eight successful boots. The hanging patterns are similar to
>> previous results. If the full boot logs would be helpful let me know,
>> I can provide them.
> 
> Thanks for letting me know. One thing we can try is check init order
> in v4.20 kernel. Can you please try to compile pci driver for the
> kernel v4.20 tag changing
> driver's last line 'arch_initcall' into 'module_init'? Just to know if
> at that working driver putting all the stuff in a later stage stills
> work as expected.
> 
> Full dmesg's of this v4.20 wih the change would be helpful.

Not exactly what you asked for, but just as useful I think.
I have a linux-5.1.14 kernel with the linux-4.20 pci-mt7621.c
driver in place. That works great, never hangs, always probes
PCI and works.

If I change the pci-mt7621.c arch_initcall() to module_init(),
then I see the PCI probe happen much latter in boot. Running this
I have booted about 15 times, no hangs, PCI bus probed and working
on every boot.

Boot log below.

Regards
Greg



Linux version 5.1.14 (gerg@goober) (gcc version 5.4.0 (GCC)) #2 SMP Tue Jun 25 14:34:27 AEST 2019
SoC Type: MediaTek MT7621 ver:1 eco:3
printk: bootconsole [early0] enabled
CPU0 revision is: 0001992f (MIPS 1004Kc)
OF: fdt: No chosen node found, continuing without
MIPS: machine is Digi EX15
Determined physical RAM map:
  memory: 10000000 @ 00000000 (usable)
Initrd not found or empty - disabling initrd
VPE topology {2,2} total 4
Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
Zone ranges:
   Normal   [mem 0x0000000000000000-0x000000000fffffff]
Movable zone start for each node
Early memory node ranges
   node   0: [mem 0x0000000000000000-0x000000000fffffff]
Initmem setup node 0 [mem 0x0000000000000000-0x000000000fffffff]
random: get_random_bytes called from start_kernel+0xb0/0x51c with crng_init=0
percpu: Embedded 15 pages/cpu s30144 r8192 d23104 u61440
Built 1 zonelists, mobility grouping on.  Total pages: 65024
Kernel command line:  console=ttyS0,115200 ubi.mtd=3 root=/dev/mtdblock5 bootpart=a
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Writing ErrCtl register=00030517
Readback ErrCtl register=00030517
Memory: 251176K/262144K available (6464K kernel code, 243K rwdata, 1200K rodata, 272K init, 228K bss, 10968K reserved, 0K cma-reserved)
SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
rcu: Hierarchical RCU implementation.
rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
NR_IRQS: 256
clocksource: GIC: mask: 0xffffffffffffffff max_cycles: 0xcaf478abb4, max_idle_ns: 440795247997 ns
sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
Calibrating delay loop... 586.13 BogoMIPS (lpj=2930688)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
rcu: Hierarchical SRCU implementation.
smp: Bringing up secondary CPUs ...
Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
CPU1 revision is: 0001992f (MIPS 1004Kc)
Synchronize counters for CPU 1: done.
Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
CPU2 revision is: 0001992f (MIPS 1004Kc)
Synchronize counters for CPU 2: done.
Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
CPU3 revision is: 0001992f (MIPS 1004Kc)
Synchronize counters for CPU 3: done.
smp: Brought up 1 node, 4 CPUs
devtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
futex hash table entries: 1024 (order: 3, 32768 bytes)
pinctrl core: initialized pinctrl subsystem
NET: Registered protocol family 16
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
pcf857x 0-0026: probed
i2c-mt7621 1e000900.i2c: clock 400KHz, re-start not support
clocksource: Switched to clocksource GIC
NET: Registered protocol family 2
tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes)
TCP established hash table entries: 2048 (order: 1, 8192 bytes)
TCP bind hash table entries: 2048 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
UDP hash table entries: 256 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
NET: Registered protocol family 1
workingset: timestamp_bits=30 max_order=16 bucket_order=0
squashfs: version 4.0 (2009/01/31) Phillip Lougher
random: fast init done
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
mt7621_gpio 1e000600.gpio: registering 32 gpios
mt7621_gpio 1e000600.gpio: registering 32 gpios
mt7621_gpio 1e000600.gpio: registering 32 gpios
Serial: 8250/16550 driver, 3 ports, IRQ sharing disabled
printk: console [ttyS0] disabled
1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 18, base_baud = 3125000) is a 16550A
printk: console [ttyS0] enabled
printk: console [ttyS0] enabled
printk: bootconsole [early0] disabled
printk: bootconsole [early0] disabled
1e000d00.uartlite: ttyS1 at MMIO 0x1e000d00 (irq = 19, base_baud = 3125000) is a 16550A
cacheinfo: Failed to find cpu0 device node
cacheinfo: Unable to detect cache hierarchy for CPU 0
brd: module loaded
mt7621-nand: NAND register bank at 0xbe003000
mt7621-nand: NAND ECC register bank at 0xbe003800
nand: device found, Manufacturer ID: 0x2c, Chip ID: 0xdc
nand: Micron NAND 512MiB 3,3V 8-bit
nand: 512 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
nand: ecc bit: 4, spare_per_sector: 16
Bad block table found at page 262080, version 0x01
Bad block table found at page 262016, version 0x01
5 fixed-partitions partitions found on MTD device MT7621-NAND
Creating 5 MTD partitions on "MT7621-NAND":
0x000000000000-0x000000200000 : "u-boot"
0x000000200000-0x000000300000 : "u-boot-env"
0x000000300000-0x000000500000 : "log"
0x000000500000-0x000020000000 : "flash"
0x000000000000-0x000020000000 : "all"
libphy: Fixed MDIO Bus: probed
tun: Universal TUN/TAP device driver, 1.6
libphy: mdio: probed
mtk_soc_eth 1e100000.ethernet: generated random MAC address c6:f5:21:ba:39:d3
mtk_soc_eth 1e100000.ethernet: connected mac 0 to PHY at fixed-0:00 [uid=00000000, driver=Generic PHY]
mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 21
PPP generic driver version 2.4.2
PPP BSD Compression module registered
PPP Deflate Compression module registered
PPP MPPE Compression module registered
NET: Registered protocol family 24
SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256).
CSLIP: code copyright 1989 Regents of the University of California.
usbcore: registered new interface driver asix
usbcore: registered new interface driver ax88179_178a
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver cdc_eem
usbcore: registered new interface driver rndis_host
usbcore: registered new interface driver cdc_subset
usbcore: registered new interface driver cdc_ncm
usbcore: registered new interface driver qmi_wwan
usbcore: registered new interface driver cdc_mbim
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-pci: EHCI PCI platform driver
ehci-platform: EHCI generic platform driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
ohci-pci: OHCI PCI platform driver
xhci-mtk 1e1c0000.xhci: xHCI Host Controller
xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 1
xhci-mtk 1e1c0000.xhci: hcc params 0x01401198 hci version 0x96 quirks 0x0000000000210010
xhci-mtk 1e1c0000.xhci: irq 20, io mem 0x1e1c0000
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.01
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: xHCI Host Controller
usb usb1: Manufacturer: Linux 5.1.14-ac0 xhci-hcd
usb usb1: SerialNumber: 1e1c0000.xhci
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
xhci-mtk 1e1c0000.xhci: xHCI Host Controller
xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 2
xhci-mtk 1e1c0000.xhci: Host supports USB 3.0  SuperSpeed
usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.01
usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb2: Product: xHCI Host Controller
usb usb2: Manufacturer: Linux 5.1.14-ac0 xhci-hcd
usb usb2: SerialNumber: 1e1c0000.xhci
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 1 port detected
usbcore: registered new interface driver cdc_acm
cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
usbcore: registered new interface driver cdc_wdm
usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial support registered for generic
usbcore: registered new interface driver ipw
usbserial: USB Serial support registered for IPWireless converter
usbcore: registered new interface driver option
usbserial: USB Serial support registered for GSM modem (1-port)
usbcore: registered new interface driver qcaux
usbserial: USB Serial support registered for qcaux
usbcore: registered new interface driver qcserial
usbserial: USB Serial support registered for Qualcomm USB modem
usbcore: registered new interface driver quatech2
usbserial: USB Serial support registered for Quatech 2nd gen USB to Serial Driver
usbcore: registered new interface driver usb_serial_simple
usbserial: USB Serial support registered for carelink
usbserial: USB Serial support registered for zio
usbserial: USB Serial support registered for funsoft
usbserial: USB Serial support registered for flashloader
usbserial: USB Serial support registered for google
usbserial: USB Serial support registered for libtransistor
usbserial: USB Serial support registered for vivopay
usbserial: USB Serial support registered for moto_modem
usbserial: USB Serial support registered for motorola_tetra
usbserial: USB Serial support registered for novatel_gps
usbserial: USB Serial support registered for hp4x
usbserial: USB Serial support registered for suunto
usbserial: USB Serial support registered for siemens_mpi
***** Xtal 40MHz *****
PCIE1 no card, disable it(RST&CLK)
PCIE2 no card, disable it(RST&CLK)
PCIE0 enabled
PCI coherence region base: 0x60000000, mask/settings: 0xf0000002
mt7621-pci 1e140000.pcie: PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io  0xffffffff]
pci_bus 0000:00: root bus resource [mem 0x60000000-0x6fffffff]
pci_bus 0000:00: root bus resource [bus 00-ff]
pci 0000:00:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
pci 0000:00:00.0: PCI bridge to [bus 01-ff]
pci 0000:00:00.0: BAR 0: no space for [mem size 0x80000000]
pci 0000:00:00.0: BAR 0: failed to assign [mem size 0x80000000]
pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x601fffff]
pci 0000:00:00.0: BAR 9: assigned [mem 0x60200000-0x602fffff pref]
pci 0000:00:00.0: BAR 1: assigned [mem 0x60300000-0x6030ffff]
pci 0000:00:00.0: BAR 7: no space for [io  size 0x1000]
pci 0000:00:00.0: BAR 7: failed to assign [io  size 0x1000]
pci 0000:01:00.0: BAR 0: assigned [mem 0x60000000-0x601fffff 64bit]
pci 0000:01:00.0: BAR 6: assigned [mem 0x60200000-0x6020ffff pref]
pci 0000:00:00.0: PCI bridge to [bus 01]
pci 0000:00:00.0:   bridge window [mem 0x60000000-0x601fffff]
pci 0000:00:00.0:   bridge window [mem 0x60200000-0x602fffff pref]
pcieport 0000:00:00.0: of_irq_parse_pci: failed with rc=-22
pcieport 0000:00:00.0: enabling device (0004 -> 0006)
u32 classifier
     input device check on
ipip: IPv4 and MPLS over IPv4 tunneling driver
gre: GRE over IPv4 demultiplexor driver
ip_gre: GRE over IPv4 tunneling driver
Initializing XFRM netlink socket
NET: Registered protocol family 10
Segment Routing with IPv6
sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
NET: Registered protocol family 17
NET: Registered protocol family 15
8021q: 802.1Q VLAN Support v1.8
libphy: dsa slave smi: probed
mt7530 mdio-bus:00 lan (uninitialized): PHY [dsa-0.0:00] driver [Generic PHY]
mt7530 mdio-bus:00 wan (uninitialized): PHY [dsa-0.0:01] driver [Generic PHY]
DSA: tree 0 setup
ubi0: attaching mtd3
ubi0: scanning is finished
ubi0: attached mtd3 (name "flash", size 507 MiB)
ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
ubi0: good PEBs: 4052, bad PEBs: 4, corrupted PEBs: 0
ubi0: user volume: 4, internal volumes: 1, max. volumes count: 128
ubi0: max/mean erase counter: 9/4, WL threshold: 4096, image sequence number: 1236486005
ubi0: available PEBs: 0, total reserved PEBs: 4052, PEBs reserved for bad PEB handling: 76
ubi0: background thread "ubi_bgt0d" started, PID 112
hctosys: unable to open rtc device (rtc0)
VFS: Mounted root (squashfs filesystem) readonly on device 31:5.
devtmpfs: mounted
Freeing unused kernel memory: 272K
This architecture does not have kernel memory protection.
Run /sbin/init as init process
Run /etc/init as init process
Run /bin/init as init process


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