diff options
| author | Johan Palsson <johan.palsson@stericsson.com> | 2011-01-20 14:23:05 +0100 |
|---|---|---|
| committer | Michael BRANDT <michael.brandt@stericsson.com> | 2011-01-20 15:23:41 +0100 |
| commit | b4f340af5537094fc72076b8e9de9b27e1c35b20 (patch) | |
| tree | 0bf0789d92201f2a906186af887857a9236e68b6 | |
| parent | 209e97ea3f7b97bde1d1b5e7cbbf90f57416c01b (diff) | |
U8500: Lower cut-off voltage threshold in AB8500
The cut-off voltage for AB8500 is set too high in the OTP.
To be able to start with a charger from a drained battery,
we have to lower this threshold before the backlight and
display is started.
ST-Ericsson ID: ER320113
ST-Ericsson FOSS-OUT ID: Trivial
Change-Id: Ia5c8c5b749fa9cb9cf8a15072ddfe5b0d1f33f5f
Signed-off-by: Johan Palsson <johan.palsson@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/13028
Reviewed-by: QATOOLS
Reviewed-by: Michael BRANDT <michael.brandt@stericsson.com>
| -rw-r--r-- | board/st/u8500/u8500.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/board/st/u8500/u8500.c b/board/st/u8500/u8500.c index 621a168d6..8b4609bf5 100644 --- a/board/st/u8500/u8500.c +++ b/board/st/u8500/u8500.c @@ -297,17 +297,42 @@ static void probe_href(void) } +#define BATT_OK_SEL1_TH_F_MASK 0xF0 +#define BATT_OK_SEL1_TH_F_2V71 0x70 + /* * board_early_access - for functionality that needs to run before * board_late_init but after board_init and emmc init. */ int board_early_access(block_dev_desc_t *block_dev) { + int ret; + int battok_regval; /* set board_id according to HREF version */ probe_href(); /* + * In AB8500 rev2.0, the cut-off voltage threshold is set too low + * and the AB will power-off when we start with a drained battery + * and a charger connected when the backlight is turned on. + * Here we will lower the cut-off voltage threshold before + * power consumption goes up + */ + ret = ab8500_read(AB8500_SYS_CTRL2_BLOCK, AB8500_BATT_OK_REG); + if (ret < 0) + return -EINVAL; + + battok_regval = ret; + + /* Mask and set BattOkSel1ThF */ + ret = ab8500_write(AB8500_SYS_CTRL2_BLOCK, AB8500_BATT_OK_REG, + (battok_regval & ~BATT_OK_SEL1_TH_F_MASK) | + BATT_OK_SEL1_TH_F_2V71); + if (ret < 0) + return -EINVAL; + + /* * Don't load itp, modem and splash if restarted (eg crashdump). */ if (!(data_init_flag > 0)) { |