From patchwork Mon Nov 14 09:27:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: wuliangfeng X-Patchwork-Id: 9426923 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7028E60476 for ; Mon, 14 Nov 2016 09:31:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E1F728934 for ; Mon, 14 Nov 2016 09:31:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 62A432893C; Mon, 14 Nov 2016 09:31:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 039C928934 for ; Mon, 14 Nov 2016 09:31:02 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1c6DaA-0006fW-1k; Mon, 14 Nov 2016 09:29:42 +0000 Received: from regular1.263xmail.com ([211.150.99.138]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1c6DZZ-0006QD-8f; Mon, 14 Nov 2016 09:29:06 +0000 Received: from wulf?rock-chips.com (unknown [192.168.167.228]) by regular1.263xmail.com (Postfix) with ESMTP id 8D8317989; Mon, 14 Nov 2016 17:28:37 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-KSVirus-check: 0 X-ABS-CHECKED: 4 Received: from localhost.localdomain (localhost [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id 2FDA23BA; Mon, 14 Nov 2016 17:28:33 +0800 (CST) 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-SENDER: wulf@rock-chips.com X-DNS-TYPE: 0 Received: from unknown (unknown [58.22.7.114]) by smtp.263.net (Postfix) whith SMTP id 526621UO9; Mon, 14 Nov 2016 17:28:38 +0800 (CST) From: William Wu To: kishon@ti.com, heiko@sntech.de 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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161114_012905_749205_08103E23 X-CRM114-Status: UNSURE ( 8.86 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: huangtao@rock-chips.com, devicetree@vger.kernel.org, groeck@google.com, frank.wang@rock-chips.com, linux-kernel@vger.kernel.org, dianders@google.com, linux-rockchip@lists.infradead.org, robh+dt@kernel.org, wulf@rock-chips.com, briannorris@google.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Douglas Anderson --- 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;