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bd99955: Enforce minimum input current of 512 mA

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Lower input current limits can cause back-boosting in some cases.

BUG=chrome-os-partner:54778
BRANCH=None
TEST=Manual on reef. Plug multiple chargers, verify ilim doesn't drop
below 512 mA and back-boosting does not occur.

Change-Id: Ia019fe52d75a9a37177605ceda473d338fd87fc3
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/356161
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2016-06-24 12:42:30 -07:00
committed by chrome-bot
parent 4cdd14d07b
commit bc49870ed1
2 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
driver/charger/bd99955.c
View File

@@ -401,6 +401,10 @@ int charger_set_input_current(int input_current)
/* Input current step 32 mA */
input_current &= ~0x1F;
if (input_current < bd99955_charger_info.input_current_min)
input_current = bd99955_charger_info.input_current_min;
rv = ch_raw_write16(BD99955_CMD_IBUS_LIM_SET, input_current,
BD99955_BAT_CHG_COMMAND);
if (rv)

2
driver/charger/bd99955.h
View File

@@ -36,7 +36,7 @@ enum bd99955_charge_port {
#define CHARGE_I_OFF 0
#define CHARGE_I_STEP 64
#define INPUT_I_MAX 16352
#define INPUT_I_MIN 0
#define INPUT_I_MIN 512
#define INPUT_I_STEP 32
/* Battery Charger Commands */