Commit 3e268eeb authored Jul 13, 2017 by Vijayavardhan Vennapusa

USB: policy_engine: Enable VBUS after VCONN before PE_SRC_Startup



Currently driver is enabling VBUS first and then enable VCONN before
PE_SRC_startup when type C mode is POWER_SUPPLY_TYPEC_SINK_POWERED_CABLE.
On some platforms, enabling VBUS is taking time which is causing VCONN
reaching 2.7V after VBUS reaches VsafeV. This is exceeding 2msec timelimit
mentioned in type C specification and causes type C complaince tests
failure. Hence enable VCONN first and then enable VBUS to pass below
type C compliance tests:
TD 4.8.3 DRP Connect Vconn Accessory Test
TD 4.9.1 Source Suspend Test

Change-Id: I2697acdcaa063f251dd37035475392510037bee5
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>

parent bc399a65

drivers/usb/pd/policy_engine.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1691,7 +1691,6 @@ static void usbpd_sm(struct work_struct *w)
		if (pd->current_pr == PR_SINK) {
		usbpd_set_state(pd, PE_SNK_STARTUP);
		} else if (pd->current_pr == PR_SRC) {
		enable_vbus(pd);
		if (!pd->vconn_enabled &&
		pd->typec_mode ==
		POWER_SUPPLY_TYPEC_SINK_POWERED_CABLE) {
		@@ -1701,6 +1700,7 @@ static void usbpd_sm(struct work_struct *w)
		else
		pd->vconn_enabled = true;
		}
		enable_vbus(pd);

		usbpd_set_state(pd, PE_SRC_STARTUP);
		}