[Bug 212] Charging seems completely broken

bugzilla-daemon at bugzilla.openmoko.org bugzilla-daemon at bugzilla.openmoko.org
Sat Mar 10 21:10:48 CET 2007


------- Additional Comments From cworth at cworth.org  2007-03-10 21:10 -------
Harald wrote:
> 1) the PMU decides that the battery voltage is high enough to boot
> 2) it switches on the CPU, which in turn switches on various peripherals, most
>    notably high-power peripherals such as backlight
> 3) due to the high current draw, the battery voltage decreases below the
>    threshold of the PMU
> a) we could set a higher Vlowbat (minimum battery voltage) threshold.  This
>    sucks because we would shut down the phone even before the battery is empty.

So is this just a case of missing hysteresis? That is, is there a single
threshold value that is being examined in steps 1 and 3 above? If so, could the
answer be as simple as using separate values and raising the value for step 1
while leaving the value for step 3 where it is?


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