linux-kernel - [PATCH 1/1] usb: chipidea: msm: Ensure proper controller reset using role switch API

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Date:   Thu,  7 May 2020 08:49:18 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Peter Chen <Peter.Chen@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-kernel@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        Peter Chen <peter.chen@....com>
Subject: [PATCH 1/1] usb: chipidea: msm: Ensure proper controller reset using role switch API

From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>

Currently we check to make sure there is no error state on the extcon
handle for VBUS when writing to the HS_PHY_GENCONFIG_2 register. When using
the USB role-switch API we still need to write to this register absent an
extcon handle.

This patch makes the appropriate update to ensure the write happens if
role-switching is true.

Fixes: 05559f10ed79 ("usb: chipidea: add role switch class support")

Cc: Peter Chen <Peter.Chen@....com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Signed-off-by: Peter Chen <peter.chen@....com>
---
 drivers/usb/chipidea/ci_hdrc_msm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
index af648ba6544d..46105457e1ca 100644
--- a/drivers/usb/chipidea/ci_hdrc_msm.c
+++ b/drivers/usb/chipidea/ci_hdrc_msm.c
@@ -114,7 +114,7 @@ static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
 			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 					HS_PHY_ULPI_TX_PKT_EN_CLR_FIX, 0);
 
-		if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
+		if (!IS_ERR(ci->platdata->vbus_extcon.edev) || ci->role_switch) {
 			hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 					HS_PHY_SESS_VLD_CTRL_EN,
 					HS_PHY_SESS_VLD_CTRL_EN);
-- 
2.17.1