[PATCH] board: stm32pm1: Fix board_check_usb_power()

[Kory Maincent]

On Tue, 14 Apr 2026 11:06:50 +0200
Patrice Chotard <patrice.chotard at foss.st.com> wrote:

> Depending of plugged power source (computer, wall charger, ...) it can
> happen that we got the following message:
> 
> "****************************************************"
> "*      USB TYPE-C charger not compliant with       *"
> "*                   specification                  *"
> "****************************************************"
> "                                                    "
> "### ERROR ### Please RESET the board ###            "
> 
> This issue has been detected on STM32MP135f-DK board.
> 
> It's due to max_uV and min_uV value are initialized at beginning of
> board_check_usb_power() and can then be used for the 2 iteration of
> adc_measurement().
> max_uV/min_uV values issued of the first adc_measurement() iteration
> are used as input of the second adc_measurement() iteration, which
> can lead to incoherent pair of min_uV/max_uV values.
> 
> To ensure that adc_measurement() returns coherent value for max_uV and
> min_uV, initialize max_uV and min_uV at each loop start.
> 
> Signed-off-by: Patrice Chotard <patrice.chotard at foss.st.com>

Reviewed-by: Kory Maincent <kory.maincent at bootlin.com>

Thank you!
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com