[PATCH -next 0/4] Add LCLK control into Aspeed LPC sub drivers
Zev Weiss
zev at bewilderbeest.net
Wed Nov 3 12:09:04 AEDT 2021
On Tue, Nov 02, 2021 at 05:54:30PM PDT, Jae Hyun Yoo wrote:
>
>
>On 11/2/2021 5:30 PM, Zev Weiss wrote:
>>On Tue, Nov 02, 2021 at 05:17:30PM PDT, Jae Hyun Yoo wrote:
>>>Hi Zev,
>>>
>>>On 11/2/2021 5:04 PM, Zev Weiss wrote:
>>>>On Mon, Nov 01, 2021 at 04:36:38PM PDT, Joel Stanley wrote:
>>>>>On Mon, 1 Nov 2021 at 23:18, <jae.hyun.yoo at intel.com> wrote:
>>>>>>
>>>>>>From: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
>>>>>>
>>>>>>Hello all,
>>>>>>
>>>>>>This series is for appliying below fix to all Aspped LPC sub drivers.
>>>>>>https://lore.kernel.org/all/20201208091748.1920-1-wangzhiqiang.bj@bytedance.com/
>>>>>>
>>>>>>
>>>>>>
>>>>>>An LPC sub driver can be enabled without using the lpc-ctrl
>>>>>>driver or it
>>>>>>can be registered ahead of lpc-ctrl depends on each system
>>>>>>configuration and
>>>>>>this difference introduces that LPC can be enabled without
>>>>>>heart beating of
>>>>>>LCLK so it causes improper handling on host interrupts when
>>>>>>the host sends
>>>>>>interrupts in that time frame. Then kernel eventually
>>>>>>forcibly disables the
>>>>>>interrupt with dumping stack and printing a 'nobody cared
>>>>>>this irq' message
>>>>>>out.
>>>>>>
>>>>>>To prevent this issue, all LPC sub drivers should enable
>>>>>>LCLK individually
>>>>>>so this patch adds clock control logic into the remaining
>>>>>>Aspeed LPC sub
>>>>>>drivers.
>>>>>
>>>>>Thanks for sending this out!
>>>>>
>>>>>This will resolve a few of the issues we have in the issue tracker:
>>>>>
>>>>>https://github.com/openbmc/linux/issues/210
>>>>>https://github.com/openbmc/linux/issues/130
>>>>>
>>>>>The patches look good to me. I think you've just missed Corey's PR for
>>>>>v5.16, but I will stick them in the openbmc tree once they've had a
>>>>>review.
>>>>>
>>>>
>>>>Hi Jae,
>>>>
>>>>I tried this series out on the same in-progress OpenBMC port
>>>>from issue number 210 linked above and am still seeing problems
>>>>(dmesg pasted below).
>>>>
>>>>I cherry-picked commit f9241fe8b9652 ("ARM: dts: aspeed: Add
>>>>uart routing to device tree") from linux-next to allow the first
>>>>patch to apply cleanly; is there anything else I might be
>>>>missing that'd be needed to test the series properly?
>>>
>>>Looks like below dmesg shows an error from 'aspeed_lpc_snoop_probe'
>>>which this series doesn't touch. Do you have below fix in your code
>>>tree?
>>>
>>>https://lore.kernel.org/all/20201208091748.1920-1-wangzhiqiang.bj@bytedance.com/
>>>
>>>
>>>Thanks,
>>>Jae
>>>
>>
>>Yes, I've got that patch (commit 3f94cf1558), and the accompanying
>>dts update to add the clocks property to the lpc-snoop device
>>(commit d050d049f8).
>>
>>However, while there is an aspeed_lpc_snoop_probe() backtrace there,
>>note that there's *also* one from aspeed_kcs_probe() further on
>>(starting at timestamp 3.263306).
>>
>>
>>Zev
>>
>
>Can you please test additional changes below?
>
No clear improvement with that unfortunately (note that the formatting
of the patch got pretty mangled there and required a lot of manual
tweaking to apply, but I think I tested the intended thing).
dmesg results below.
Zev
[ 0.425073] irq 32: nobody cared (try booting with the "irqpoll" option)
[ 0.425118] CPU: 0 PID: 1 Comm: swapper Not tainted 5.14.11-aee45db-dirty-4b119be-hacked #1
[ 0.425161] Hardware name: Generic DT based system
[ 0.425185] Backtrace:
[ 0.425219] [<807e6504>] (dump_backtrace) from [<807e6758>] (show_stack+0x20/0x24)
[ 0.425315] r7:00000000 r6:00000008 r5:00000000 r4:80902b50
[ 0.425339] [<807e6738>] (show_stack) from [<807f09f0>] (dump_stack+0x28/0x30)
[ 0.425397] [<807f09c8>] (dump_stack) from [<807e76e0>] (__report_bad_irq+0x40/0xc0)
[ 0.425454] r5:00000000 r4:80d43900
[ 0.425473] [<807e76a0>] (__report_bad_irq) from [<80159c10>] (note_interrupt+0x284/0x2dc)
[ 0.425555] r9:80cbc000 r8:00000020 r7:00000000 r6:00000008 r5:00000000 r4:80d43900
[ 0.425577] [<8015998c>] (note_interrupt) from [<801569d4>] (handle_irq_event+0xb4/0xc0)
[ 0.425637] r10:00000000 r9:80cbc000 r8:80d439a8 r7:00000000 r6:00000008 r5:00000000
[ 0.425663] r4:80d43900 r3:00000000
[ 0.425681] [<80156920>] (handle_irq_event) from [<8015acd0>] (handle_level_irq+0xac/0x180)
[ 0.425738] r5:00000000 r4:80d43900
[ 0.425758] [<8015ac24>] (handle_level_irq) from [<80155fa4>] (handle_domain_irq+0x60/0x7c)
[ 0.425811] r5:00000000 r4:80b8e7c8
[ 0.425829] [<80155f44>] (handle_domain_irq) from [<8010121c>] (avic_handle_irq+0x64/0x6c)
[ 0.425886] r7:80cbdc94 r6:ffffffff r5:80cbdc60 r4:80c02420
[ 0.425908] [<801011b8>] (avic_handle_irq) from [<80100aec>] (__irq_svc+0x6c/0x90)
[ 0.425954] Exception stack(0x80cbdc60 to 0x80cbdca8)
[ 0.425994] dc60: 00000000 00000000 00000000 00000000 80d43900 00000000 8529d700 00000020
[ 0.426029] dc80: 80d439a8 60000053 00000000 80cbdcdc 00000000 80cbdcb0 8015a520 80157d4c
[ 0.426057] dca0: 40000053 ffffffff
[ 0.426083] r5:40000053 r4:80157d4c
[ 0.426101] [<80157a0c>] (__setup_irq) from [<8015844c>] (request_threaded_irq+0xe8/0x16c)
[ 0.426166] r9:852b07a0 r8:00000020 r7:80d43910 r6:80d43900 r5:00000000 r4:8529d700
[ 0.426186] [<80158364>] (request_threaded_irq) from [<8015bd80>] (devm_request_threaded_irq+0x78/0xd0)
[ 0.426257] r10:8092ed9c r9:00000000 r8:852b07a0 r7:80d42410 r6:00000020 r5:804600bc
[ 0.426283] r4:8529d220 r3:00000080
[ 0.426302] [<8015bd08>] (devm_request_threaded_irq) from [<80460514>] (aspeed_lpc_snoop_probe+0x15c/0x2e0)
[ 0.426392] r10:80bab000 r9:80983b68 r8:80d42410 r7:8529d100 r6:80d42400 r5:852b07a0
[ 0.426414] r4:00000000
[ 0.426431] [<804603b8>] (aspeed_lpc_snoop_probe) from [<804e69a8>] (platform_probe+0x54/0x9c)
[ 0.426515] r8:00000000 r7:80d42410 r6:80b6f3dc r5:80b6f3dc r4:80d42410
[ 0.426535] [<804e6954>] (platform_probe) from [<804e4534>] (really_probe+0x1c4/0x46c)
[ 0.426588] r5:00000000 r4:80d42410
[ 0.426609] [<804e4370>] (really_probe) from [<804e48b0>] (__driver_probe_device+0xd4/0x1bc)
[ 0.426661] r7:80d42410 r6:80d42410 r5:80bcb44c r4:80b6f3dc
[ 0.426679] [<804e47dc>] (__driver_probe_device) from [<804e49d8>] (driver_probe_device+0x40/0xd8)
[ 0.426736] r9:80983b68 r8:00000000 r7:80d42410 r6:80b6f3dc r4:80bcb340
[ 0.426757] [<804e4998>] (driver_probe_device) from [<804e4d3c>] (__driver_attach+0xa4/0x1c8)
[ 0.426814] r9:80983b68 r8:80a2c838 r7:80b71638 r6:80b6f3dc r5:80d42454 r4:80d42410
[ 0.426834] [<804e4c98>] (__driver_attach) from [<804e214c>] (bus_for_each_dev+0x84/0xd0)
[ 0.426890] r7:80b71638 r6:804e4c98 r5:80b6f3dc r4:00000000
[ 0.426912] [<804e20c8>] (bus_for_each_dev) from [<804e5468>] (driver_attach+0x28/0x30)
[ 0.426964] r6:00000000 r5:852aa660 r4:80b6f3dc
[ 0.426984] [<804e5440>] (driver_attach) from [<804e2ae8>] (bus_add_driver+0x114/0x200)
[ 0.427028] [<804e29d4>] (bus_add_driver) from [<804e5b04>] (driver_register+0x98/0x128)
[ 0.427080] r7:00000000 r6:00000007 r5:00000000 r4:80b6f3dc
[ 0.427100] [<804e5a6c>] (driver_register) from [<804e7c54>] (__platform_driver_register+0x2c/0x34)
[ 0.427159] r5:80c03e40 r4:80a1997c
[ 0.427179] [<804e7c28>] (__platform_driver_register) from [<80a1999c>] (aspeed_lpc_snoop_driver_init+0x20/0x28)
[ 0.427237] [<80a1997c>] (aspeed_lpc_snoop_driver_init) from [<80a01408>] (do_one_initcall+0x64/0x144)
[ 0.427310] [<80a013a4>] (do_one_initcall) from [<80a016e4>] (kernel_init_freeable+0x198/0x218)
[ 0.427377] r7:80a2c858 r6:00000007 r5:80c03e40 r4:80a4c8f0
[ 0.427399] [<80a0154c>] (kernel_init_freeable) from [<807f0c48>] (kernel_init+0x20/0x134)
[ 0.427463] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:807f0c28
[ 0.427487] r4:00000000
[ 0.427506] [<807f0c28>] (kernel_init) from [<80100130>] (ret_from_fork+0x14/0x24)
[ 0.427556] Exception stack(0x80cbdfb0 to 0x80cbdff8)
[ 0.427593] dfa0: 00000000 00000000 00000000 00000000
[ 0.427628] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 0.427660] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 0.427688] r5:807f0c28 r4:00000000
[ 0.427706] handlers:
[ 0.427723] [<(ptrval)>] aspeed_lpc_snoop_irq
[ 0.427791] Disabling IRQ #32
[ 0.638760] Serial: 8250/16550 driver, 6 ports, IRQ sharing enabled
[ 0.649120] 1e787000.serial: ttyS5 at MMIO 0x1e787000 (irq = 32, base_baud = 1546875) is a 8250
[ 0.651220] 1e784000.serial: ttyS4 at MMIO 0x1e784000 (irq = 31, base_baud = 1500000) is a 16550A
[ 2.020143] Freeing initrd memory: 1072K
[ 2.234013] printk: console [ttyS4] enabled
[ 2.240436] timeriomem_rng 1e6e2078.hwrng: 32bits from 0x5a0c8e0a @ 1us
[ 2.263519] loop: module loaded
[ 2.285336] aspeed-smc 1e620000.spi: Using 100 MHz SPI frequency
[ 2.291781] aspeed-smc 1e620000.spi: mx66l51235f (65536 Kbytes)
[ 2.297774] aspeed-smc 1e620000.spi: CE0 window [ 0x20000000 - 0x24000000 ] 64MB
[ 2.305301] aspeed-smc 1e620000.spi: CE1 window [ 0x24000000 - 0x2a000000 ] 96MB
[ 2.312810] aspeed-smc 1e620000.spi: read control register: 203c0641
[ 2.543850] 5 fixed-partitions partitions found on MTD device bmc
[ 2.550093] Creating 5 MTD partitions on "bmc":
[ 2.554677] 0x000000000000-0x0000000e0000 : "u-boot"
[ 2.562517] 0x0000000e0000-0x000000100000 : "u-boot-env"
[ 2.570803] 0x000000100000-0x000000a00000 : "kernel"
[ 2.578741] 0x000000a00000-0x000002a00000 : "rofs"
[ 2.586351] 0x000002a00000-0x000004000000 : "rwfs"
[ 2.595769] aspeed-smc 1e630000.spi: Using 50 MHz SPI frequency
[ 2.601925] aspeed-smc 1e630000.spi: unrecognized JEDEC id bytes: 00 00 00 00 00 00
[ 2.609715] aspeed-smc 1e630000.spi: Aspeed SMC probe failed -2
[ 2.615673] aspeed-smc: probe of 1e630000.spi failed with error -2
[ 2.629807] libphy: Fixed MDIO Bus: probed
[ 2.635910] ftgmac100 1e660000.ethernet: Read MAC address d0:50:99:f4:1e:18 from chip
[ 2.652487] libphy: ftgmac100_mdio: probed
[ 2.657714] RTL8211E Gigabit Ethernet 1e660000.ethernet--1:00: attached PHY driver (mii_bus:phy_addr=1e660000.ethernet--1:00, irq=POLL)
[ 2.671153] ftgmac100 1e660000.ethernet eth0: irq 20, mapped at 31b7a2b2
[ 2.681960] aspeed_vhub 1e6a0000.usb-vhub: Initialized virtual hub in USB2 mode
[ 2.689974] Mass Storage Function, version: 2009/09/11
[ 2.695169] LUN: removable file: (no medium)
[ 2.699621] no file given for LUN0
[ 2.703126] g_mass_storage 1e6a0000.usb-vhub:p1: failed to start g_mass_storage: -22
[ 2.711656] i2c /dev entries driver
[ 2.717000] aspeed-i2c-bus 1e78a040.i2c-bus: i2c bus 0 registered, irq 33
[ 2.725583] aspeed-i2c-bus 1e78a080.i2c-bus: i2c bus 1 registered, irq 34
[ 2.735502] aspeed-i2c-bus 1e78a0c0.i2c-bus: i2c bus 2 registered, irq 35
[ 2.743830] aspeed-i2c-bus 1e78a100.i2c-bus: i2c bus 3 registered, irq 36
[ 2.752145] aspeed-i2c-bus 1e78a140.i2c-bus: i2c bus 4 registered, irq 37
[ 2.761322] aspeed-i2c-bus 1e78a180.i2c-bus: i2c bus 5 registered, irq 38
[ 2.769610] aspeed-i2c-bus 1e78a1c0.i2c-bus: i2c bus 6 registered, irq 39
[ 2.779443] at24 7-0050: 16384 byte 24c128 EEPROM, writable, 16 bytes/write
[ 2.786675] aspeed-i2c-bus 1e78a300.i2c-bus: i2c bus 7 registered, irq 40
[ 2.794972] aspeed-i2c-bus 1e78a340.i2c-bus: i2c bus 8 registered, irq 41
[ 2.803273] aspeed-i2c-bus 1e78a380.i2c-bus: i2c bus 9 registered, irq 42
[ 2.816561] at24 14-0050: 2048 byte 24c16 EEPROM, read-only
[ 2.822535] i2c i2c-2: Added multiplexed i2c bus 14
[ 2.828115] i2c i2c-2: Added multiplexed i2c bus 15
[ 2.833787] i2c i2c-2: Added multiplexed i2c bus 16
[ 2.839596] i2c i2c-2: Added multiplexed i2c bus 17
[ 2.844572] pca954x 2-0070: registered 4 multiplexed busses for I2C switch pca9545
[ 2.853735] i2c i2c-5: Added multiplexed i2c bus 18
[ 2.859577] i2c i2c-5: Added multiplexed i2c bus 19
[ 2.865233] i2c i2c-5: Added multiplexed i2c bus 20
[ 2.871052] i2c i2c-5: Added multiplexed i2c bus 21
[ 2.876022] pca954x 5-0073: registered 4 multiplexed busses for I2C switch pca9545
[ 2.886206] Driver for 1-wire Dallas network protocol.
[ 3.011064] NET: Registered PF_INET6 protocol family
[ 3.019138] Segment Routing with IPv6
[ 3.023663] NET: Registered PF_PACKET protocol family
[ 3.029388] 8021q: 802.1Q VLAN Support v1.8
[ 3.044832] ast-kcs-bmc 1e78902c.kcs: Initialised raw client for channel 3
[ 3.052335] ast-kcs-bmc 1e78902c.kcs: Initialised IPMI client for channel 3
[ 3.274513] irq 32: nobody cared (try booting with the "irqpoll" option)
[ 3.281266] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 5.14.11-aee45db-dirty-4b119be-hacked #1
[ 3.290082] Hardware name: Generic DT based system
[ 3.294891] Workqueue: events_unbound deferred_probe_work_func
[ 3.300786] Backtrace:
[ 3.303263] [<807e6504>] (dump_backtrace) from [<807e6758>] (show_stack+0x20/0x24)
[ 3.310902] r7:00000000 r6:00000008 r5:00000000 r4:80902b50
[ 3.316567] [<807e6738>] (show_stack) from [<807f09f0>] (dump_stack+0x28/0x30)
[ 3.323841] [<807f09c8>] (dump_stack) from [<807e76e0>] (__report_bad_irq+0x40/0xc0)
[ 3.331628] r5:00000000 r4:80d43900
[ 3.335217] [<807e76a0>] (__report_bad_irq) from [<80159c10>] (note_interrupt+0x284/0x2dc)
[ 3.343542] r9:80cc6000 r8:00000020 r7:00000000 r6:00000008 r5:00000000 r4:80d43900
[ 3.351293] [<8015998c>] (note_interrupt) from [<801569d4>] (handle_irq_event+0xb4/0xc0)
[ 3.359437] r10:00000000 r9:80cc6000 r8:80d439a8 r7:00000000 r6:00000008 r5:00000000
[ 3.367270] r4:80d43900 r3:00000400
[ 3.370854] [<80156920>] (handle_irq_event) from [<8015acd0>] (handle_level_irq+0xac/0x180)
[ 3.379251] r5:00000000 r4:80d43900
[ 3.382841] [<8015ac24>] (handle_level_irq) from [<80155fa4>] (handle_domain_irq+0x60/0x7c)
[ 3.391239] r5:00000000 r4:80b8e7c8
[ 3.394826] [<80155f44>] (handle_domain_irq) from [<8010121c>] (avic_handle_irq+0x64/0x6c)
[ 3.403140] r7:80cc7c84 r6:ffffffff r5:80cc7c50 r4:80c02420
[ 3.408814] [<801011b8>] (avic_handle_irq) from [<80100aec>] (__irq_svc+0x6c/0x90)
[ 3.416417] Exception stack(0x80cc7c50 to 0x80cc7c98)
[ 3.421493] 7c40: 00000000 00000000 00000000 00000000
[ 3.429688] 7c60: 80d43900 8529d700 851206c0 00000020 80d439a8 a0000013 00000000 80cc7ccc
[ 3.437876] 7c80: 00000400 80cc7ca0 8015a520 80157d4c 40000013 ffffffff
[ 3.444502] r5:40000013 r4:80157d4c
[ 3.448091] [<80157a0c>] (__setup_irq) from [<8015844c>] (request_threaded_irq+0xe8/0x16c)
[ 3.456407] r9:8505fb20 r8:00000020 r7:80d43910 r6:80d43900 r5:00000000 r4:851206c0
[ 3.464160] [<80158364>] (request_threaded_irq) from [<8015bd80>] (devm_request_threaded_irq+0x78/0xd0)
[ 3.473613] r10:80d4ea20 r9:00000000 r8:8505fb20 r7:80d42c10 r6:00000020 r5:8044fd64
[ 3.481452] r4:851207a0 r3:00000080
[ 3.485037] [<8015bd08>] (devm_request_threaded_irq) from [<804505f0>] (aspeed_kcs_probe+0x244/0x67c)
[ 3.494324] r10:8505fb54 r9:80833650 r8:ffffffea r7:80d42c10 r6:00000020 r5:8505fb20
[ 3.502166] r4:80d42c00
[ 3.504710] [<804503ac>] (aspeed_kcs_probe) from [<804e69a8>] (platform_probe+0x54/0x9c)
[ 3.512873] r10:8093c994 r9:80b9b840 r8:00000001 r7:80d42c10 r6:80b6e7b0 r5:80b6e7b0
[ 3.520712] r4:80d42c10
[ 3.523256] [<804e6954>] (platform_probe) from [<804e4534>] (really_probe+0x1c4/0x46c)
[ 3.531220] r5:00000000 r4:80d42c10
[ 3.534810] [<804e4370>] (really_probe) from [<804e48b0>] (__driver_probe_device+0xd4/0x1bc)
[ 3.543288] r7:80d42c10 r6:80d42c10 r5:80bcb44c r4:80b6e7b0
[ 3.548954] [<804e47dc>] (__driver_probe_device) from [<804e49d8>] (driver_probe_device+0x40/0xd8)
[ 3.557954] r9:80b9b840 r8:00000001 r7:80d42c10 r6:80cc7e84 r4:80bcb340
[ 3.564658] [<804e4998>] (driver_probe_device) from [<804e4c08>] (__device_attach_driver+0xb8/0x148)
[ 3.573831] r9:80b9b840 r8:00000000 r7:80d42c10 r6:80cc7e84 r5:80b6e7b0 r4:00000001
[ 3.581576] [<804e4b50>] (__device_attach_driver) from [<804e2670>] (bus_for_each_drv+0x90/0xe0)
[ 3.590408] r7:80b71484 r6:804e4b50 r5:80cc7e84 r4:00000000
[ 3.596074] [<804e25e0>] (bus_for_each_drv) from [<804e4f64>] (__device_attach+0x104/0x18c)
[ 3.604473] r6:80d42c54 r5:00000001 r4:80d42c10
[ 3.609101] [<804e4e60>] (__device_attach) from [<804e5394>] (device_initial_probe+0x1c/0x20)
[ 3.617673] r6:80d42c10 r5:80b71638 r4:80d4ca50
[ 3.622299] [<804e5378>] (device_initial_probe) from [<804e2888>] (bus_probe_device+0x94/0x9c)
[ 3.630944] [<804e27f4>] (bus_probe_device) from [<804e3f64>] (deferred_probe_work_func+0xa0/0xe8)
[ 3.639948] r7:80b71484 r6:80b71470 r5:80d42c10 r4:80d4ca50
[ 3.645613] [<804e3ec4>] (deferred_probe_work_func) from [<801301ac>] (process_one_work+0x1b4/0x46c)
[ 3.654797] r10:80b71490 r9:00000000 r8:00000000 r7:80c85d00 r6:00000040 r5:80c045a0
[ 3.662640] r4:80b7148c r3:804e3ec4
[ 3.666223] [<8012fff8>] (process_one_work) from [<8013066c>] (worker_thread+0x208/0x528)
[ 3.674443] r10:80c08a00 r9:00000088 r8:80b46840 r7:80c08a14 r6:80c045b4 r5:80c08a00
[ 3.682284] r4:80c045a0
[ 3.684822] [<80130464>] (worker_thread) from [<80136f18>] (kthread+0x138/0x160)
[ 3.692272] r10:80c03860 r9:80cbde60 r8:80cc6000 r7:80c045a0 r6:80130464 r5:80c03840
[ 3.700112] r4:80c02b80
[ 3.702658] [<80136de0>] (kthread) from [<80100130>] (ret_from_fork+0x14/0x24)
[ 3.709921] Exception stack(0x80cc7fb0 to 0x80cc7ff8)
[ 3.714999] 7fa0: 00000000 00000000 00000000 00000000
[ 3.723192] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 3.731378] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 3.738012] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80136de0
[ 3.745847] r4:80c02b80 r3:00000000
[ 3.749431] handlers:
[ 3.751710] [<7d4a6f47>] aspeed_lpc_snoop_irq
[ 3.756139] [<77501825>] aspeed_kcs_irq
[ 3.760031] Disabling IRQ #32
[ 3.763218] ast-kcs-bmc 1e78902c.kcs: Initialised channel 3 at 0xca2
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