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bq24773: turn off prochot warning

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Turn off prochot warning on bq24773 by default because our
battery can always supply enough power for the whole system
so we don't need to throttle the CPU if the BQ senses too much
input current.

BUG=chrome-os-partner:34885
BRANCH=samus
TEST=force BQ into it's prochot condition on samus by setting
the charging voltage temporarily below the battery voltage, which
causes INA to turn off and the BQ to think IADP is > 4.1A. in
this condition PROCHOT is normally asserted and CPU slows down,
but with this patch PROCHOT is not asserted and the CPU does not
slow down.

Change-Id: I658dbe568b7bfe94944ef90d6d59656a0683c8a0
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/243231
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Sameer Nanda <snanda@chromium.org>
This commit is contained in:
Alec Berg
2015-01-26 09:21:16 -08:00
committed by ChromeOS Commit Bot
parent 6fb8ab3369
commit 2737321ecd
2 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
driver/charger/bq24773.c
View File

@@ -184,6 +184,10 @@ int charger_post_init(void)
if (rv)
return rv;
/* Turn off PROCHOT warning */
rv = i2c_write8(I2C_PORT_CHARGER, BQ24773_ADDR,
BQ24773_PROCHOT_OPTION1, 0);
#ifdef CONFIG_CHARGER_ILIM_PIN_DISABLED
/* Read the external ILIM pin enabled flag. */
rv = i2c_read16(I2C_PORT_CHARGER, BQ24773_ADDR,

6
driver/charger/bq24773.h
View File

@@ -14,9 +14,9 @@
/* Chip specific commands */
#define BQ24773_CHARGE_OPTION0 0x00
#define BQ24773_CHARGE_OPTION1 0x02
#define BQ24773_PROTECT_OPTION0 0x04
#define BQ24773_PROTECT_OPTION1 0x06
#define BQ24773_PROTECT_STATUS 0x08
#define BQ24773_PROCHOT_OPTION0 0x04
#define BQ24773_PROCHOT_OPTION1 0x06
#define BQ24773_PROCHOT_STATUS 0x08
#define BQ24773_DEVICE_ADDRESS 0x09
#define BQ24773_CHARGE_CURRENT 0x0A
#define BQ24773_MAX_CHARGE_VOLTAGE 0x0C