Hi, On Sun, Jun 21, 2026 at 10:06:38AM +0800, Peng Fan (OSS) wrote: > From: Peng Fan <[email protected]> > > After reaching SNK_READY or SRC_READY, the poll loop exits immediately. > However, some PD sources send follow-up messages (e.g., Get_Sink_Cap, > Get_Status) shortly after the explicit contract is established. Since > the TCPCI hardware auto-sends GoodCRC for received messages, the > source expects a timely response. If no response arrives within > SenderResponseTimer (24-30ms), the source sends a Hard Reset, > causing VBUS to drop and resetting VBUS-powered boards. > > Add a 500ms settling period after reaching Ready state to process > any follow-up messages from the source before entering low power > mode and disabling PD message reception. > > Signed-off-by: Peng Fan <[email protected]> > ---
Reviewed-by: Sebastian Reichel <[email protected]> Greetings, -- Sebastian > drivers/usb/tcpm/tcpm.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/drivers/usb/tcpm/tcpm.c b/drivers/usb/tcpm/tcpm.c > index 25ff0926cdf..d6af0fae7c1 100644 > --- a/drivers/usb/tcpm/tcpm.c > +++ b/drivers/usb/tcpm/tcpm.c > @@ -2252,6 +2252,16 @@ static void tcpm_poll_event(struct udevice *dev) > tcpm_check_and_run_delayed_work(dev); > } > > + if (port->state == SNK_READY || port->state == SRC_READY) { > + int settle; > + > + for (settle = 0; settle < 1000; settle++) { > + drvops->poll_event(dev); > + udelay(500); > + tcpm_check_and_run_delayed_work(dev); > + } > + } > + > if (port->state != SNK_READY && port->state != SRC_READY) > dev_warn(dev, "TCPM: exit in state %s\n", > tcpm_states[port->state]); > > -- > 2.51.0 >
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