diff options
| author | Aren Moynihan <aren@peacevolution.org> | 2024-01-30 15:27:59 -0500 |
|---|---|---|
| committer | Sebastian Reichel <sebastian.reichel@collabora.com> | 2024-02-02 23:21:53 +0100 |
| commit | 06a807e6e5ffaa35327e85b386f00c8614f6caaa (patch) | |
| tree | 578978b31aefb13cf56313f0dabbf101f61d3632 /drivers/power | |
| parent | b02fbd830edf9f2cce076d93b787827aac1e402a (diff) | |
| download | linux-06a807e6e5ffaa35327e85b386f00c8614f6caaa.tar.gz | |
power: supply: axp20x_usb_power: fix race condition with usb bc
When input_current_limit is set while USB BC is in progress, the BC
module will overwrite the value that was set when it finishes detection.
Signed-off-by: Aren Moynihan <aren@peacevolution.org>
Link: https://lore.kernel.org/r/20240130203714.3020464-4-aren@peacevolution.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/supply/axp20x_usb_power.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/power/supply/axp20x_usb_power.c b/drivers/power/supply/axp20x_usb_power.c index 923121b23d5fd3..ac5a3f126df692 100644 --- a/drivers/power/supply/axp20x_usb_power.c +++ b/drivers/power/supply/axp20x_usb_power.c @@ -117,6 +117,15 @@ static void axp20x_usb_power_poll_vbus(struct work_struct *work) if (val != power->old_status) power_supply_changed(power->supply); + if (power->usb_bc_en_bit && (val & AXP20X_PWR_STATUS_VBUS_PRESENT) != + (power->old_status & AXP20X_PWR_STATUS_VBUS_PRESENT)) { + dev_dbg(power->dev, "Cable status changed, re-enabling USB BC"); + ret = regmap_field_write(power->usb_bc_en_bit, 1); + if (ret) + dev_err(power->dev, "failed to enable USB BC: errno %d", + ret); + } + power->old_status = val; power->online = val & AXP20X_PWR_STATUS_VBUS_USED; @@ -265,12 +274,26 @@ static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power, static int axp20x_usb_power_set_input_current_limit(struct axp20x_usb_power *power, int intval) { + int ret; unsigned int reg; const unsigned int max = power->axp_data->curr_lim_table_size; if (intval == -1) return -EINVAL; + /* + * BC1.2 detection can cause a race condition if we try to set a current + * limit while it's in progress. When it finishes it will overwrite the + * current limit we just set. + */ + if (power->usb_bc_en_bit) { + dev_dbg(power->dev, + "disabling BC1.2 detection because current limit was set"); + ret = regmap_field_write(power->usb_bc_en_bit, 0); + if (ret) + return ret; + } + for (reg = max - 1; reg > 0; reg--) if (power->axp_data->curr_lim_table[reg] <= intval) break; |