From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753843AbcKNJ3R (ORCPT ); Mon, 14 Nov 2016 04:29:17 -0500 Received: from regular1.263xmail.com ([211.150.99.138]:34042 "EHLO regular1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752238AbcKNJ2n (ORCPT ); Mon, 14 Nov 2016 04:28:43 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-RL-SENDER: wulf@rock-chips.com X-FST-TO: kishon@ti.com X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: wulf@rock-chips.com X-UNIQUE-TAG: <2af08be38277aea13a67b56e0192b51c> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: William Wu To: kishon@ti.com, heiko@sntech.de Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, robh+dt@kernel.org, frank.wang@rock-chips.com, huangtao@rock-chips.com, dianders@google.com, briannorris@google.com, groeck@google.com, wulf@rock-chips.com Subject: [PATCH v3 2/2] phy: rockchip-inno-usb2: correct 480MHz output clock stable time Date: Mon, 14 Nov 2016 17:27:11 +0800 Message-Id: <1479115631-20137-3-git-send-email-wulf@rock-chips.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1479115631-20137-1-git-send-email-wulf@rock-chips.com> References: <1479115631-20137-1-git-send-email-wulf@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We found that the system crashed due to 480MHz output clock of USB2 PHY was unstable after clock had been enabled by gpu module. Theoretically, 1 millisecond is a critical value for 480MHz output clock stable time, so we try to change the delay time to 1.2 millisecond to avoid this issue. And the commit ed907fb1d7c3 ("phy: rockchip-inno-usb2: correct clk_ops callback") used prepare callbacks instead of enable callbacks to support gate a clk if the operation may sleep. So we can switch from delay to sleep functions. Signed-off-by: William Wu --- Changes in v3: - fix kbuild test error: too few arguments to function 'usleep_range' Changes in v2: - use usleep_range() function instead of mdelay() drivers/phy/phy-rockchip-inno-usb2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c index 365e077..0e52b25 100644 --- a/drivers/phy/phy-rockchip-inno-usb2.c +++ b/drivers/phy/phy-rockchip-inno-usb2.c @@ -166,7 +166,7 @@ static int rockchip_usb2phy_clk480m_prepare(struct clk_hw *hw) return ret; /* waitting for the clk become stable */ - mdelay(1); + usleep_range(1200, 1300); } return 0; -- 2.0.0