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Commit a9e32705 authored by Vijayavardhan Vennapusa's avatar Vijayavardhan Vennapusa
Browse files

USB: pd: Send PS_RDY within tNewSrc after PS_RDY received 



USBPD spec mentions max time within which device that transitions
from sink power role to source needs to send PS_RDY message after
PS_RDY received from other device as part of PR_SWAP. Currently
USB PD driver is taking time around 380msec i.e greater than tNewSrc
(275msec) and resulting in USB PD complaince test "2.2.3.1.2
Procedure/Checks for Tester (Source) Originated Swap" failure. Fix it
by waiting only till VBUS voltage reaches VSafe5Vmin.

Change-Id: I3138e6d31ba964507230fe5f914aaaf2e261647d
Signed-off-by: default avatarVijayavardhan Vennapusa <vvreddy@codeaurora.org>
parent e4fab30e

drivers/usb/pd/policy_engine.c

+16 −1
Original line number Diff line number Diff line
@@ -1929,6 +1929,22 @@ static int enable_vbus(struct usbpd *pd) 
	else

		pd->vbus_enabled = true;



	count = 10;

	/*

	 * Check to make sure VBUS voltage reaches above Vsafe5Vmin (4.75v)

	 * before proceeding.

	 */

	while (count--) {

		ret = power_supply_get_property(pd->usb_psy,

				POWER_SUPPLY_PROP_VOLTAGE_NOW, &val);

		if (ret || val.intval >= 4750000) /*vsafe5Vmin*/

			break;

		usleep_range(10000, 12000); /* Delay between two reads */

	}



	if (ret)

		msleep(100); /* Delay to wait for VBUS ramp up if read fails */



	return ret;

}
@@ -2838,7 +2854,6 @@ static void usbpd_sm(struct work_struct *w) 


	case PE_PRS_SNK_SRC_SOURCE_ON:

		enable_vbus(pd);

		msleep(200); /* allow time VBUS ramp-up, must be < tNewSrc */



		ret = pd_send_msg(pd, MSG_PS_RDY, NULL, 0, SOP_MSG);

		if (ret) {