From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754772AbdERDnR (ORCPT ); Wed, 17 May 2017 23:43:17 -0400 Received: from regular1.263xmail.com ([211.150.99.133]:40919 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754257AbdERDnO (ORCPT ); Wed, 17 May 2017 23:43:14 -0400 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-RL-SENDER: frank.wang@rock-chips.com X-FST-TO: heiko@sntech.de X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: frank.wang@rock-chips.com X-UNIQUE-TAG: <1cd4917f8677f9dbdbb1e8f00d3675fb> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Frank Wang To: heiko@sntech.de, kishon@ti.com, william.wu@rock-chips.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, charles.chen@rock-chips.com, cody.xie@rock-chips.com, kevan.lan@rock-chips.com, huangtao@rock-chips.com, wmc@rock-chips.com, Frank Wang Subject: [PATCH 1/4] phy: rockchip-inno-usb2: add a delay after phy resume Date: Thu, 18 May 2017 11:42:59 +0800 Message-Id: <1495078982-2555-2-git-send-email-frank.wang@rock-chips.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1495078982-2555-1-git-send-email-frank.wang@rock-chips.com> References: <1495078982-2555-1-git-send-email-frank.wang@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: William Wu When resume phy, it need about 1.5 ~ 2ms to wait for utmi_clk which used for USB controller to become stable. Signed-off-by: William Wu Signed-off-by: Frank Wang --- drivers/phy/phy-rockchip-inno-usb2.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c index 8efe78a..f12dc8d 100644 --- a/drivers/phy/phy-rockchip-inno-usb2.c +++ b/drivers/phy/phy-rockchip-inno-usb2.c @@ -463,6 +463,9 @@ static int rockchip_usb2phy_power_on(struct phy *phy) if (ret) return ret; + /* waiting for the utmi_clk to become stable */ + usleep_range(1500, 2000); + rport->suspended = false; return 0; } -- 2.0.0