From patchwork Fri Aug 2 08:34:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Chen X-Patchwork-Id: 2837582 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 5B5629F479 for ; Fri, 2 Aug 2013 08:52:44 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 53ED620251 for ; Fri, 2 Aug 2013 08:52:43 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 454E82023F for ; Fri, 2 Aug 2013 08:52:42 +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 1V5Aqi-0004ER-7r; Fri, 02 Aug 2013 08:36:37 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V5Apv-0000wC-9i; Fri, 02 Aug 2013 08:35:47 +0000 Received: from mail-db9lp0250.outbound.messaging.microsoft.com ([213.199.154.250] helo=db9outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V5ApU-0000pb-2m for linux-arm-kernel@lists.infradead.org; Fri, 02 Aug 2013 08:35:23 +0000 Received: from mail218-db9-R.bigfish.com (10.174.16.234) by DB9EHSOBE035.bigfish.com (10.174.14.98) with Microsoft SMTP Server id 14.1.225.22; Fri, 2 Aug 2013 08:35:02 +0000 Received: from mail218-db9 (localhost [127.0.0.1]) by mail218-db9-R.bigfish.com (Postfix) with ESMTP id A7C9820182; Fri, 2 Aug 2013 08:35:01 +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(zzzz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6hzz1de098h8275bh1de097hz2dh2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h1354h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1b2fh1fb3h1d0ch1d2eh1d3fh1dfeh1dffh1e23h1155h) Received: from mail218-db9 (localhost.localdomain [127.0.0.1]) by mail218-db9 (MessageSwitch) id 1375432499286607_27572; Fri, 2 Aug 2013 08:34:59 +0000 (UTC) Received: from DB9EHSMHS006.bigfish.com (unknown [10.174.16.236]) by mail218-db9.bigfish.com (Postfix) with ESMTP id 387022A0044; Fri, 2 Aug 2013 08:34:59 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by DB9EHSMHS006.bigfish.com (10.174.14.16) with Microsoft SMTP Server (TLS) id 14.16.227.3; Fri, 2 Aug 2013 08:34:58 +0000 Received: from az84smr01.freescale.net (10.64.34.197) by 039-SN1MMR1-001.039d.mgd.msft.net (10.84.1.13) with Microsoft SMTP Server (TLS) id 14.3.136.1; Fri, 2 Aug 2013 08:34:56 +0000 Received: from localhost.localdomain (nchen-desktop.ap.freescale.net [10.192.242.40]) by az84smr01.freescale.net (8.14.3/8.14.0) with ESMTP id r728Y6hh007485; Fri, 2 Aug 2013 01:34:52 -0700 From: Peter Chen To: , Subject: [PATCH v14 10/12] usb: chipidea: add wait vbus lower than OTGSC_BSV before role starts Date: Fri, 2 Aug 2013 16:34:03 +0800 Message-ID: <1375432445-31918-11-git-send-email-peter.chen@freescale.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1375432445-31918-1-git-send-email-peter.chen@freescale.com> References: <1375432445-31918-1-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-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130802_043520_484837_48122CFC X-CRM114-Status: GOOD ( 16.69 ) X-Spam-Score: -1.9 (-) Cc: marex@denx.de, m.grzeschik@pengutronix.de, frank.li@freescale.com, linux-usb@vger.kernel.org, mkl@pengutronix.de, peter.chen@freescale.com, kernel@pengutronix.de, maxime.ripard@free-electrons.com, shawn.guo@linaro.org, festevam@gmail.com, linux-arm-kernel@lists.infradead.org, LW@KARO-electronics.de 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=-5.6 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 When the gadget role starts, we need to make sure the vbus is lower than OTGSC_BSV, or there will be an vbus interrupt since we use B_SESSION_VALID as vbus interrupt to indicate connect and disconnect. When the host role starts, it may not be useful to wait vbus to lower than OTGSC_BSV, but it can indicate some hardware problems like the vbus is still higher than OTGSC_BSV after we disconnect to host some time later (5000 milliseconds currently), which is obvious not correct. Tested-by: Marek Vasut Signed-off-by: Peter Chen --- drivers/usb/chipidea/ci.h | 3 +++ drivers/usb/chipidea/core.c | 32 ++++++++++++++++++++++++++++++++ drivers/usb/chipidea/otg.c | 4 ++++ 3 files changed, 39 insertions(+), 0 deletions(-) diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h index 3160363..1c94fc5 100644 --- a/drivers/usb/chipidea/ci.h +++ b/drivers/usb/chipidea/ci.h @@ -308,4 +308,7 @@ int hw_port_test_set(struct ci_hdrc *ci, u8 mode); u8 hw_port_test_get(struct ci_hdrc *ci); +int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask, + u32 value, unsigned int timeout_ms); + #endif /* __DRIVERS_USB_CHIPIDEA_CI_H */ diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index 0e69282..f09b4db 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -294,6 +294,38 @@ int hw_device_reset(struct ci_hdrc *ci, u32 mode) return 0; } +/** + * hw_wait_reg: wait the register value + * + * Sometimes, it needs to wait register value before going on. + * Eg, when switch to device mode, the vbus value should be lower + * than OTGSC_BSV before connects to host. + * + * @ci: the controller + * @reg: register index + * @mask: mast bit + * @value: the bit value to wait + * @timeout_ms: timeout in millisecond + * + * This function returns an error code if timeout + */ +int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask, + u32 value, unsigned int timeout_ms) +{ + unsigned long elapse = jiffies + msecs_to_jiffies(timeout_ms); + + while (hw_read(ci, reg, mask) != value) { + if (time_after(jiffies, elapse)) { + dev_err(ci->dev, "timeout waiting for %08x in %d\n", + mask, reg); + return -ETIMEDOUT; + } + msleep(20); + } + + return 0; +} + static irqreturn_t ci_irq(int irq, void *data) { struct ci_hdrc *ci = data; diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c index c74194d..d39cce8 100644 --- a/drivers/usb/chipidea/otg.c +++ b/drivers/usb/chipidea/otg.c @@ -67,6 +67,7 @@ void ci_handle_vbus_change(struct ci_hdrc *ci) usb_gadget_vbus_disconnect(&ci->gadget); } +#define CI_VBUS_STABLE_TIMEOUT_MS 5000 static void ci_handle_id_switch(struct ci_hdrc *ci) { enum ci_role role = ci_otg_role(ci); @@ -76,6 +77,9 @@ static void ci_handle_id_switch(struct ci_hdrc *ci) ci_role(ci)->name, ci->roles[role]->name); ci_role_stop(ci); + /* wait vbus lower than OTGSC_BSV */ + hw_wait_reg(ci, OP_OTGSC, OTGSC_BSV, 0, + CI_VBUS_STABLE_TIMEOUT_MS); ci_role_start(ci, role); } }