Openmoko Bug #2293: linux/andy-tracking: gps does not always honor power_on

Openmoko Public Trac bugs at docs.openmoko.org
Thu Jun 4 22:03:45 CEST 2009


#2293: linux/andy-tracking: gps does not always honor power_on
-----------------------------+----------------------------------------------
 Reporter:  lindi            |          Owner:  openmoko-kernel    
     Type:  defect           |         Status:  new                
 Priority:  normal           |      Milestone:                     
Component:  System Software  |        Version:  unspecified        
 Severity:  normal           |       Keywords:  kernel gps power_on
 Haspatch:  0                |      Blockedby:                     
Estimated:                   |    Patchreview:                     
 Blocking:                   |   Reproducible:  always             
-----------------------------+----------------------------------------------
 Steps to reproduce:
 1) echo 1 > /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973
 -pm-gps.0/power_on
 2) echo mem > /sys/power/state
 3) cat /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-
 gps.0/power_on
 4) echo 1 > /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973
 -pm-gps.0/power_on
 5) cat /sys/class/i2c-adapter/i2c-0/0-0073/pcf50633-regltr.7/neo1973-pm-
 gps.0/power_on

 Expected results:
 3) 1 or 0, both are ok to me
 5) 1

 Actual results:
 3) 0
 5) 0

 More info:
 6) I can start the GPS chip if I first write 0 to power_on and then write
 1 there.
 7) I am using andy-tracking 9ecc089861ab238e
 8) I think the bug is that neo1973_gps.power_was_on is updated only in
 power_gps_write() but gta01_pm_gps_suspend calls gps_pwron_set(0) directly
 and bypasses this.
 9) My understanding:
 * cat power_on returns 0
 * since gps_pwron_get returns 0
 * since regulator_is_enabled(neo1973_gps.regulator[GTA02_GPS_REG_RF_3V])
 returns 0

 * echo 1 > power_on does not enable regulator
 * since neo1973_gps.power_was_on is set

 * => power_was_on state is wrong.

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/2293>
docs.openmoko.org <http://docs.openmoko.org/trac/>
openmoko trac


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