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charge_ramp: Reduce max ICL if VBUS drops on stable ramp

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Some chargers lose VBUS even when ramp is stable and we re-ramp for
those chargers. It continues in loop. To avoid this issue, reduce
the max input current limit if VBUS drops on stable ramp.

BUG=chrome-os-partner:60544
BRANCH=none
TEST=Tested on Reef. Ramp settles to lower current and multiple
     re-ramp is not observed.

Change-Id: I6c9ce4720d01b9e8e3215e8122f798076e516c19
Signed-off-by: Vijay Hiremath <vijay.p.hiremath@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/416349
Commit-Ready: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Tested-by: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Tested-by: Rachel Nancollas <rachelsn@google.com>
Reviewed-by: Shawn N <shawnn@chromium.org>
This commit is contained in:
Vijay Hiremath
2016-12-02 14:14:53 -08:00
committed by chrome-bot
parent 515249a7d3
commit 81e20f0e58
1 changed files with 2 additions and 0 deletions
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2
common/charge_ramp.c
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@@ -305,6 +305,8 @@ void chg_ramp_task(void)
if (board_is_ramp_allowed(active_sup) &&
board_is_vbus_too_low(CHG_RAMP_VBUS_STABLE)) {
CPRINTS("VBUS low; Re-ramp");
max_icl = MAX(min_icl,
max_icl - RAMP_ICL_BACKOFF);
active_icl_new = min_icl;
ramp_st_new = CHG_RAMP_RAMP;
}