allwinner/i2c interrupt storm detected

[Daniel Braniss]

Hi,

after a long time I decided to try and upgrade to stable 12.1 r362793 since I saw some changes where done 
with respect to the DTS and twsi.c, 

if nothing is connected to the i2c, i2c -s just hangs,

if something is connected this is what i get on the console after typing ‘i2c -s’


Hardware may not support START/STOP scanning; trinterrupt storm detected on "gic0,s6:"; throttling interrupt source
ying less-reliable read method.
interrupt storm detected on "gic0,s6:"; throttling interrupt source
interrupt storm detected on "gic0,s6:"; throttling interrupt source
…

and
neo-04> vmstat -i
interrupt                                             total       rate
gic0,p13:-ic_timer0                                   16052        164
gic0,s0: uart2                                          318          3
gic0,s6: iichb0                                       13034        133
gic0,s60: aw_mmc0                                      1293         13
gic0,s82: awg0                                          334          3
gic0,s120: pmu0                                       49725        509
cpu0:rendezvous                                          18          0
cpu1:rendezvous                                          50          1
cpu2:rendezvous                                          51          1
cpu3:rendezvous                                          40          0
cpu0:preempt                                           2691         28
cpu1:preempt                                           3165         32
cpu2:preempt                                           2778         28
cpu3:preempt                                           2986         31
cpu0:hardclock                                           15          0
Total                                                 92550        946


the hardware is an NanoPi Neo
---<<BOOT>>---
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2020 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
       The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 12.1-STABLE #0 r362793M: Tue Jun 30 11:39:11 IDT 2020
   danny at nrnd:/home/obj/nrnd/arm/neo/vol/rnd/stable/12/arm.armv7/sys/AWGEN arm
FreeBSD clang version 10.0.0 (git at github.com <mailto:git at github.com>:llvm/llvm-project.git llvmorg-10.0.0-0-gd32170dbd5b)
VT: init without driver.
No PSCI/SMCCC call function found
CPU: ARM Cortex-A7 r0p5 (ECO: 0x00000000)
…