Re: [PATCH 2/2] power: supply: qcom_battmgr: expose the charge current limit

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 10/16/26 2:48 PM, Joonhoe Kim wrote:
> The battery manager firmware takes a charge current limit in uA
> (BATT_CHG_CTRL_LIM) and reports the highest value it accepts
> (BATT_CHG_CTRL_LIM_MAX). Expose them on SM8550 class batteries as
> charge_control_limit and charge_control_limit_max, clamping writes to
> the maximum.

[...]


> +static int qcom_battmgr_set_charge_control_limit(struct qcom_battmgr *battmgr, int limit)
> +{
> +	int ret;
> +
> +	if (limit < 0)
> +		return -EINVAL;
> +
> +	mutex_lock(&battmgr->lock);

guard(mutex)(&battmgr->lock)

> +	ret = qcom_battmgr_request_property(battmgr, BATTMGR_BAT_PROPERTY_GET,
> +					    BATT_CHG_CTRL_LIM_MAX, 0);
> +	if (!ret) {

LLM suggests to add:

-	if (!ret) {
+	if (!ret && !battmgr->info.charge_ctrl_limit_max)
+		ret = -ENODATA;
+	if (!ret) {

to prevent a possible zero-maximum value coming from the FW
from messing with us here

Konrad