Commit 7fa1e1c9 authored Dec 14, 2016 by Jack Pham

usb: pd: Increase number of SRC_CAP attempts before starting host



It is observed that some PD-capable sink devices have a
longer start-up delay before responding to the Source
Capabilities message with a Request. Since it is PD capable
we'd like to wait until after entering PE_SRC_Ready and VDM
Discovery to start USB host mode. Accommodate these devices by
increasing the number of failed attempts of sending the message
from 5 to 10 before treating it as a non-PD device and starting
host mode.

Change-Id: Ia555699e78729b75dc118cbb929f7c4c4f2d1279
Signed-off-by: Jack Pham <jackp@codeaurora.org>

parent d1a0cb9f

drivers/usb/pd/policy_engine.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1571,7 +1571,7 @@ static void usbpd_sm(struct work_struct *w)
		if (ret) {
		pd->caps_count++;

		if (pd->caps_count == 5 && pd->current_dr == DR_DFP) {
		if (pd->caps_count == 10 && pd->current_dr == DR_DFP) {
		/* Likely not PD-capable, start host now */
		start_usb_host(pd, true);
		} else if (pd->caps_count >= PD_CAPS_COUNT) {