86 lines
2.6 KiB
Diff
86 lines
2.6 KiB
Diff
From: Ondrej Jirman <megous@megous.com>
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Date: Sun, 14 Nov 2021 21:24:05 +0100
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Subject: [PATCH 14/36] power: supply: core: Don't ignore max_current of 0
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when setting current limit
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If we ignore current limit of 0, the dependent power source will not
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set input current limit to that value when the supplier changes max
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current to 0. This may happen when USB power is disconnected from the
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device.
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On next connection, the dependent power supply will start consuming
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power at the previously set limit even before the PD/BC1.2 power
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negotiation has a chance to complete.
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Signed-off-by: Ondrej Jirman <megous@megous.com>
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---
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drivers/power/supply/power_supply_core.c | 47 ++++++++++++++------------------
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1 file changed, 20 insertions(+), 27 deletions(-)
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diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
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index 6093754..1c5be0d 100644
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--- a/drivers/power/supply/power_supply_core.c
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+++ b/drivers/power/supply/power_supply_core.c
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@@ -375,41 +375,34 @@ int power_supply_is_system_supplied(void)
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}
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EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
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-static int __power_supply_get_supplier_max_current(struct device *dev,
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- void *data)
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-{
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- union power_supply_propval ret = {0,};
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- struct power_supply *epsy = dev_get_drvdata(dev);
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- struct power_supply *psy = data;
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-
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- if (__power_supply_is_supplied_by(epsy, psy))
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- if (!epsy->desc->get_property(epsy,
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- POWER_SUPPLY_PROP_CURRENT_MAX,
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- &ret))
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- return ret.intval;
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-
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- return 0;
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-}
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-
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int power_supply_set_input_current_limit_from_supplier(struct power_supply *psy)
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{
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union power_supply_propval val = {0,};
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- int curr;
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+ struct class_dev_iter iter;
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+ struct power_supply *epsy;
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+ struct device *dev;
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+ int ret;
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if (!psy->desc->set_property)
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return -EINVAL;
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- /*
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- * This function is not intended for use with a supply with multiple
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- * suppliers, we simply pick the first supply to report a non 0
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- * max-current.
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- */
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- curr = class_for_each_device(power_supply_class, NULL, psy,
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- __power_supply_get_supplier_max_current);
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- if (curr <= 0)
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- return (curr == 0) ? -ENODEV : curr;
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+ class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
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+ while ((dev = class_dev_iter_next(&iter))) {
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+ epsy = dev_get_drvdata(dev);
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+
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+ if (!__power_supply_is_supplied_by(epsy, psy))
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+ continue;
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- val.intval = curr;
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+ ret = epsy->desc->get_property(epsy,
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+ POWER_SUPPLY_PROP_CURRENT_MAX,
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+ &val);
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+ if (!ret)
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+ break;
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+ }
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+ class_dev_iter_exit(&iter);
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+
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+ if (ret)
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+ return ret;
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return psy->desc->set_property(psy,
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POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
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