Openmoko Bug #2324: resume_reason can show EINT01_GSM even if GSM is off

[Openmoko Public Trac]

#2324: resume_reason can show EINT01_GSM even if GSM is off
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 Reporter:  lindi            |          Owner:  openmoko-kernel  
     Type:  defect           |         Status:  new              
 Priority:  normal           |      Milestone:                   
Component:  System Software  |        Version:  unspecified      
 Severity:  normal           |       Keywords:  resume_reason GSM
 Haspatch:  0                |      Blockedby:                   
Estimated:                   |    Patchreview:                   
 Blocking:                   |   Reproducible:  always           
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 Steps to reproduce:
 1) receive a call while the phone is in suspend
 2) stop GSM
 3) suspend the phone
 4) press power button
 5) check /sys/class/i2c-
 adapter/i2c-0/0-0073/neo1973-resume.0/resume_reason for resume reason

 Expected results:
 5) resume reason is only EINT09_PMU

 Actual results:
 5) both GSM and PMU are shown as a resume reason:

 {{{
   EINT00_ACCEL1
 * EINT01_GSM
   EINT02_BLUETOOTH
   EINT03_DEBUGBRD
   EINT04_JACK
   EINT05_WLAN
   EINT06_AUXKEY
   EINT07_HOLDKEY
   EINT08_ACCEL2
 * EINT09_PMU
   EINT10_NULL
   EINT11_NULL
   EINT12_GLAMO
   EINT13_NULL
   EINT14_NULL
   EINT15_NULL
 }}}

 More info:
 1) linux andy-tracking a3587e4ed77974ad
 2) Qi 9ef7754b8243457c
 3) the problem does not appear unless the GSM has woken the system up at
 least once
 4) I read some source code and was able to figure out:

 4.1) drivers/misc/neo1973_pm_resume_reason.c reads resume reason from
 gstatus4 at 0x560000BC
 4.2) Qi has written to this address the contents of SRCPND at 0x4A000000

 I mmap()'d SRCPND via /dev/mem and it seems to contain the bytes
 0c 20 00 00. (I have no idea if simple mmap() is actually able to read
 this correctly.)

 5) If I execute steps 3 - 5 again GSM is not shown as a resume reason
 anymore.

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Ticket URL: <https://docs.openmoko.org/trac/ticket/2324>
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