From patchwork Tue Dec 24 03:58:56 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Chen X-Patchwork-Id: 3400181 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id AC815C0D4A for ; Tue, 24 Dec 2013 05:00:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 201D22073E for ; Tue, 24 Dec 2013 05:00:09 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0B491205F3 for ; Tue, 24 Dec 2013 05:00:08 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VvJkR-0005bw-C2; Tue, 24 Dec 2013 04:37:40 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VvJjg-0006GC-CT; Tue, 24 Dec 2013 04:36:52 +0000 Received: from mail-db8lp0186.outbound.messaging.microsoft.com ([213.199.154.186] helo=db8outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VvJiW-00067K-9r for linux-arm-kernel@lists.infradead.org; Tue, 24 Dec 2013 04:35:42 +0000 Received: from mail76-db8-R.bigfish.com (10.174.8.239) by DB8EHSOBE002.bigfish.com (10.174.4.65) with Microsoft SMTP Server id 14.1.225.22; Tue, 24 Dec 2013 04:35:21 +0000 Received: from mail76-db8 (localhost [127.0.0.1]) by mail76-db8-R.bigfish.com (Postfix) with ESMTP id 691C0740202; Tue, 24 Dec 2013 04:35:21 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 0 X-BigFish: VS0(zzzz1f42h2148h208ch1ee6h1de0h1fdah2073h2146h1202h1e76h2189h1d1ah1d2ah1fc6hzz1de098h8275bh1de097hz2dh2a8h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh2222h224fh1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1fe8h1ff5h2218h2216h226dh22d0h2327h2336h1155h) Received: from mail76-db8 (localhost.localdomain [127.0.0.1]) by mail76-db8 (MessageSwitch) id 1387859719254132_10901; Tue, 24 Dec 2013 04:35:19 +0000 (UTC) Received: from DB8EHSMHS009.bigfish.com (unknown [10.174.8.244]) by mail76-db8.bigfish.com (Postfix) with ESMTP id 3490AC004E; Tue, 24 Dec 2013 04:35:19 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by DB8EHSMHS009.bigfish.com (10.174.4.19) with Microsoft SMTP Server (TLS) id 14.16.227.3; Tue, 24 Dec 2013 04:35:19 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-003.039d.mgd.msft.net (10.84.1.16) with Microsoft SMTP Server (TLS) id 14.3.158.2; Tue, 24 Dec 2013 04:35:17 +0000 Received: from shlinux1.ap.freescale.net (shlinux1.ap.freescale.net [10.192.225.216]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id rBO4YBUP027583; Mon, 23 Dec 2013 21:35:13 -0700 From: Peter Chen To: , , , Subject: [PATCH v8 12/12] usb: phy-mxs: Add sync time after controller clear phcd Date: Tue, 24 Dec 2013 11:58:56 +0800 Message-ID: <1387857536-4996-13-git-send-email-peter.chen@freescale.com> X-Mailer: git-send-email 1.7.8 In-Reply-To: <1387857536-4996-1-git-send-email-peter.chen@freescale.com> References: <1387857536-4996-1-git-send-email-peter.chen@freescale.com> MIME-Version: 1.0 X-OriginatorOrg: freescale.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% X-FOPE-CONNECTOR: Id%0$Dn%FREESCALE.MAIL.ONMICROSOFT.COM$RO%1$TLS%0$FQDN%$TlsDn% X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131223_233540_619611_EEDFD15D X-CRM114-Status: UNSURE ( 9.41 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.6 (/) Cc: marex@denx.de, devicetree@vger.kernel.org, m.grzeschik@pengutronix.de, frank.li@freescale.com, linux-doc@vger.kernel.org, alexander.shishkin@linux.intel.com, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, peter.chen@freescale.com, kernel@pengutronix.de, festevam@gmail.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-3.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD,UNPARSEABLE_RELAY,UNRESOLVED_TEMPLATE autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP After clear portsc.phcd, PHY needs 200us stable time for switch 32K clock to AHB clock. Signed-off-by: Peter Chen --- drivers/usb/phy/phy-mxs-usb.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c index 2722a86..ea41bb4 100644 --- a/drivers/usb/phy/phy-mxs-usb.c +++ b/drivers/usb/phy/phy-mxs-usb.c @@ -151,6 +151,15 @@ static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy) return mxs_phy->data == &imx6sl_phy_data; } +/* + * PHY needs some 32K cycles to switch from 32K clock to + * bus (such as AHB/AXI, etc) clock. + */ +static void mxs_phy_clock_switch_delay(void) +{ + usleep_range(300, 400); +} + static int mxs_phy_hw_init(struct mxs_phy *mxs_phy) { int ret; @@ -276,6 +285,7 @@ static int mxs_phy_init(struct usb_phy *phy) { struct mxs_phy *mxs_phy = to_mxs_phy(phy); + mxs_phy_clock_switch_delay(); clk_prepare_enable(mxs_phy->clk); return mxs_phy_hw_init(mxs_phy); } @@ -300,6 +310,7 @@ static int mxs_phy_suspend(struct usb_phy *x, int suspend) x->io_priv + HW_USBPHY_CTRL_SET); clk_disable_unprepare(mxs_phy->clk); } else { + mxs_phy_clock_switch_delay(); clk_prepare_enable(mxs_phy->clk); writel(BM_USBPHY_CTRL_CLKGATE, x->io_priv + HW_USBPHY_CTRL_CLR);