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USB: pd: Send PS_RDY within tNewSrc after PS_RDY received

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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: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
This commit is contained in:
Vijayavardhan Vennapusa 2018-07-03 15:47:18 +05:30 • committed by Gerrit - the friendly Code Review server
parent de5fd0b3ce
commit 16683815e8
1 changed files with 16 additions and 1 deletions
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17
drivers/usb/pd/policy_engine.c
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@ -1826,6 +1826,22 @@ enable_reg:
else else
pd->vbus_enabled = true; 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; return ret;
} }
@ -2747,7 +2763,6 @@ static void usbpd_sm(struct work_struct *w)
case PE_PRS_SNK_SRC_SOURCE_ON: case PE_PRS_SNK_SRC_SOURCE_ON:
enable_vbus(pd); 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); ret = pd_send_msg(pd, MSG_PS_RDY, NULL, 0, SOP_MSG);
if (ret) { if (ret) {