Messages in this thread Patch in this message | | | From | Aren Moynihan <> | Subject | [PATCH 3/3] power: supply: axp20x_usb_power: set input current limit in probe | Date | Sat, 20 Jan 2024 20:40:04 -0500 |
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axp803 sets the current limit to 3A by default if it doesn't detect a battery. The datasheet says that reg 0x2D bit 6 is used to indicate first power on status. According to it, if that bit is 0 and the battery is not detected, it will set the input current limit to 3A, however setting that bit to 1 doesn't to prevent the pmic from setting the current limit to 3A.
Fixes: c279adafe6ab ("power: supply: axp20x_usb_power: add support for AXP813")
Signed-off-by: Aren Moynihan <aren@peacevolution.org> --- I'm not sure if the pmic simply ignores the first power on field, or if it needs to be set in a specific way / at a specific time. I tried setting it in arm-trusted-firmware, and the pmic still set the input current limit to 3A.
The datasheet for axp813 says it has the same first power on bit, but I don't have hardware to test if it behaves the same way. This driver uses the same platform data for axp803 and axp813.
drivers/power/supply/axp20x_usb_power.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c index 5656f6e57d54..95b136ee20f2 100644 --- a/drivers/power/supply/axp20x_usb_power.c +++ b/drivers/power/supply/axp20x_usb_power.c @@ -52,6 +52,7 @@ struct axp_data { const int *curr_lim_table; int input_curr_lim_table_size; const int *input_curr_lim_table; + int force_input_curr_lim; struct reg_field curr_lim_fld; struct reg_field input_curr_lim_fld; struct reg_field vbus_valid_bit; @@ -599,6 +600,7 @@ static const struct axp_data axp813_data = { .input_curr_lim_table_size = ARRAY_SIZE(axp_813_usb_input_curr_lim_table), .input_curr_lim_table = axp_813_usb_input_curr_lim_table, .input_curr_lim_fld = REG_FIELD(AXP22X_CHRG_CTRL3, 4, 7), + .force_input_curr_lim = 500000, .usb_bc_en_bit = REG_FIELD(AXP288_BC_GLOBAL, 0, 0), .usb_bc_det_fld = REG_FIELD(AXP288_BC_DET_STAT, 5, 7), .vbus_disable_bit = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 7, 7), @@ -786,6 +788,17 @@ static int axp20x_usb_power_probe(struct platform_device *pdev) return ret; } + if (power->axp_data->force_input_curr_lim) { + /* + * Certain chips set the input current limit to 3A when there is + * no battery connected. Normally the default is 500mA. + */ + ret = axp20x_usb_power_set_input_current_limit(power, + power->axp_data->force_input_curr_lim); + if (ret) + return ret; + } + if (power->usb_bc_en_bit) { /* Enable USB Battery Charging specification detection */ ret = regmap_field_write(power->usb_bc_en_bit, 1); -- 2.43.0
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