diff options
| author | Patrice Chotard <patrice.chotard@st.com> | 2020-10-16 09:28:59 +0200 |
|---|---|---|
| committer | Patrick Delaunay <patrick.delaunay@foss.st.com> | 2021-01-13 09:52:58 +0100 |
| commit | 42082bc61b4646ef1e61ad01cfb4ffefc457db75 (patch) | |
| tree | a07a503071d188e3dce124a1e32f4dd55402a310 /drivers/pwm/pwm-ti-ehrpwm.c | |
| parent | 8396408e795cdf34fc8f622a01fdfb867fc05e54 (diff) | |
board: stm32pm1: update USB-C power detection algorithm on DK boards
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 <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
Diffstat (limited to 'drivers/pwm/pwm-ti-ehrpwm.c')
0 files changed, 0 insertions, 0 deletions