From 5523f06a19502d08449c1e6ca7e33bfc860f6059 Mon Sep 17 00:00:00 2001 From: Peter Chen Date: Mon, 10 Feb 2020 18:46:27 +0800 Subject: [PATCH] usb: chipidea: pull down dp for possible charger detection operation The bootloader may use device mode, and keep dp up. We need dp to be pulled down before possbile charger detection operation. Signed-off-by: Peter Chen --- drivers/usb/chipidea/core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index ea8ac4a..804c0a5 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -1123,8 +1123,11 @@ static int ci_hdrc_probe(struct platform_device *pdev) if (!ci_otg_is_fsm_mode(ci)) { /* only update vbus status for peripheral */ - if (ci->role == CI_ROLE_GADGET) + if (ci->role == CI_ROLE_GADGET) { + /* Pull down DP for possible charger detection */ + hw_write(ci, OP_USBCMD, USBCMD_RS, 0); ci_handle_vbus_change(ci); + } ret = ci_role_start(ci, ci->role); if (ret) { -- 2.7.4