Hi Patrice, > From: Patrice CHOTARD <[email protected]> > Sent: vendredi 16 octobre 2020 09:29 > > USB-C power supply which are Power Delivery compliant (USB-PD) are able to > provide different voltage/current (for example 5V/3A 9V/3A 12V/2.25A...) > > In this case, the power supply need to negotiate the voltage/current to use > with > the device using CC1/CC2 USB-C signals. > > If this negotiation occurs during ADC measurement (done also on CC1/CC2 USB- > C signals) some ADC acquisition can be corrupted which cause wrong power > supply current detection. > > To avoid this, the power supply current detection algorithm is updated as > following: > - perform an ADC measurement, if a 3A current is detected, continue the > boot process. > - else, wait 20ms (max tPDDebounce duration) to ensure that USB-PD > negotiation is done and perform another ADC measurement. > > Signed-off-by: Patrice Chotard <[email protected]> > --- > > board/st/stm32mp1/stm32mp1.c | 106 +++++++++++++++++++++-------------- > 1 file changed, 63 insertions(+), 43 deletions(-) >
Reviewed-by: Patrick Delaunay <[email protected]> Thanks Patrick
