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| author | Vic Yang <victoryang@chromium.org> | 2013-07-30 16:23:10 -0700 |
|---|---|---|
| committer | ChromeBot <chrome-bot@google.com> | 2013-08-01 18:15:47 -0700 |
| commit | 191693b8815be1a2b60c1241be2a67c8e6e413f9 (patch) | |
| tree | 03fc9d37471d2d6e29b8e1f0d5c892db605125b0 | |
| parent | bcdfbee1b6b666ef758a35feaf37ee0aba3bf8cd (diff) | |
| download | chrome-ec-191693b8815be1a2b60c1241be2a67c8e6e413f9.tar.gz | |
spring: Allow a minimum 100mA current input
With this, we are able to boot with a super dead battery even with a bad
charger. This however breaks support for chargers that cannot even
supply 100mA, but that's very unlikely to happen.
BUG=chrome-os-partner:21107
TEST=Charge a dead battery with a bad charger and a super long cable.
BRANCH=Spring
Change-Id: I3c532523456185223420a4381f56365ad3afb2ec
Original-Change-Id: I6b7b0df0ae7bdf863420755ea92e09d87f6866c3
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/63804
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/64276
| -rw-r--r-- | common/extpower_usb.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/common/extpower_usb.c b/common/extpower_usb.c index 89c9a3577f..a34d0ac66c 100644 --- a/common/extpower_usb.c +++ b/common/extpower_usb.c @@ -67,7 +67,7 @@ enum ilim_config { #define I_LIMIT_3000MA 0 /* PWM control loop parameters */ -#define PWM_CTRL_MAX_DUTY 96 /* Minimum current for dead battery */ +#define PWM_CTRL_MAX_DUTY I_LIMIT_100MA /* Minimum current */ #define PWM_CTRL_BEGIN_OFFSET 90 #define PWM_CTRL_OC_MARGIN 15 #define PWM_CTRL_OC_DETECT_TIME (1200 * MSEC) @@ -403,17 +403,10 @@ static int pwm_check_vbus_high(int vbus) static void pwm_nominal_duty_cycle(int percent) { - int dummy; int new_percent = percent; new_percent += PWM_CTRL_BEGIN_OFFSET; - - /* - * If the battery is dead, leave a minimum amount of current - * input to sustain the system. - */ - if (battery_current(&dummy)) - new_percent = MIN(new_percent, PWM_CTRL_MAX_DUTY); + new_percent = MIN(new_percent, PWM_CTRL_MAX_DUTY); set_pwm_duty_cycle(new_percent); nominal_pwm_duty = percent; |