From: Alexey Charkov Date: Tue, 2 Jun 2026 20:10:50 +0000 (+0400) Subject: power: supply: bq257xx: Fix VSYSMIN clamping logic X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=b6c6b9260a92dacef6edef8e93bc2767b86b1dfe;p=thirdparty%2Fkernel%2Fstable.git power: supply: bq257xx: Fix VSYSMIN clamping logic The minimal system voltage (VSYSMIN) is meant to protect the battery from dangerous over-discharge. When the device tree provides a value for the minimum design voltage of the battery, the user should not be allowed to set a lower VSYSMIN, as that would defeat the purpose of this protection. Flip the clamping logic when setting VSYSMIN to ensure that battery design voltage is respected. Cc: stable@vger.kernel.org Fixes: 1cc017b7f9c7 ("power: supply: bq257xx: Add support for BQ257XX charger") Tested-by: Chris Morgan Signed-off-by: Alexey Charkov Link: https://patch.msgid.link/20260603-bq25792-v7-2-d487bed276d0@flipper.net Signed-off-by: Sebastian Reichel --- diff --git a/drivers/power/supply/bq257xx_charger.c b/drivers/power/supply/bq257xx_charger.c index 02c7d8b61e82..7ca4ae610902 100644 --- a/drivers/power/supply/bq257xx_charger.c +++ b/drivers/power/supply/bq257xx_charger.c @@ -128,9 +128,8 @@ static int bq25703_get_min_vsys(struct bq257xx_chg *pdata, int *intval) * @vsys: voltage value to set in uV. * * This function takes a requested minimum system voltage value, clamps - * it between the minimum supported value by the charger and a user - * defined minimum system value, and then writes the value to the - * appropriate register. + * it between the user defined minimum system value and the maximum supported + * value by the charger, and then writes the value to the appropriate register. * * Return: Returns 0 on success or error if an error occurs. */ @@ -139,7 +138,7 @@ static int bq25703_set_min_vsys(struct bq257xx_chg *pdata, int vsys) unsigned int reg; int vsys_min = pdata->vsys_min; - vsys = clamp(vsys, BQ25703_MINVSYS_MIN_UV, vsys_min); + vsys = clamp(vsys, vsys_min, BQ25703_MINVSYS_MAX_UV); reg = ((vsys - BQ25703_MINVSYS_MIN_UV) / BQ25703_MINVSYS_STEP_UV); reg = FIELD_PREP(BQ25703_MINVSYS_MASK, reg);