From patchwork Wed Nov 24 22:19:26 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gregory CLEMENT X-Patchwork-Id: 354542 Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id oAOMJut1016706 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 24 Nov 2010 22:20:18 GMT Received: from localhost ([127.0.0.1] helo=sfs-ml-1.v29.ch3.sourceforge.com) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1PLNgr-0000Is-1d; Wed, 24 Nov 2010 22:19:49 +0000 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-1.v29.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1PLNgq-0000Ih-4K for spi-devel-general@lists.sourceforge.net; Wed, 24 Nov 2010 22:19:48 +0000 Received-SPF: pass (sog-mx-2.v43.ch3.sourceforge.com: domain of free-electrons.com designates 88.190.12.23 as permitted sender) client-ip=88.190.12.23; envelope-from=gregory.clement@free-electrons.com; helo=mail.free-electrons.com; Received: from mail.free-electrons.com ([88.190.12.23]) by sog-mx-2.v43.ch3.sourceforge.com with esmtp (Exim 4.69) id 1PLNgo-0002VQ-Bj for spi-devel-general@lists.sourceforge.net; Wed, 24 Nov 2010 22:19:48 +0000 Received: by mail.free-electrons.com (Postfix, from userid 106) id D5C01132; Wed, 24 Nov 2010 23:19:39 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.3.1 Received: from [192.168.49.63] (unknown [213.27.180.194]) by mail.free-electrons.com (Postfix) with ESMTPA id 6DC71138; Wed, 24 Nov 2010 23:19:31 +0100 (CET) Message-ID: <4CED8F6E.3000808@free-electrons.com> Date: Wed, 24 Nov 2010 23:19:26 +0100 From: Gregory CLEMENT User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.15) Gecko/20101027 Lightning/1.0b1 Thunderbird/3.0.10 MIME-Version: 1.0 To: linux-omap , spi-devel-general@lists.sourceforge.net Subject: [PATCH v5 1/1] OMAP2: Spi: Force CS to be in inactive state after off-mode transition X-Enigmail-Version: 1.0.1 X-Spam-Score: -1.5 (-) X-Spam-Report: Spam Filtering performed by mx.sourceforge.net. See http://spamassassin.org/tag/ for more details. -1.5 SPF_CHECK_PASS SPF reports sender host as permitted sender for sender-domain -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.0 SPF_PASS SPF: sender matches SPF record X-Headers-End: 1PLNgo-0002VQ-Bj Cc: Kevin Hilman , David Brownell X-BeenThere: spi-devel-general@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Linux SPI core/device drivers discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: spi-devel-general-bounces@lists.sourceforge.net X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter1.kernel.org [140.211.167.41]); Wed, 24 Nov 2010 22:20:25 +0000 (UTC) diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c index 2a651e6..dcc024a 100644 --- a/drivers/spi/omap2_mcspi.c +++ b/drivers/spi/omap2_mcspi.c @@ -1305,11 +1305,44 @@ static int __exit omap2_mcspi_remove(struct platform_device *pdev) /* work with hotplug and coldplug */ MODULE_ALIAS("platform:omap2_mcspi"); +#ifdef CONFIG_PM +/* When SPI wake up from off-mode, CS is in activate state. If it was in + * unactive state when driver was suspend, then force it to unactive state at + * wake up. + */ +static int omap2_mcspi_resume(struct platform_device *pdev) +{ + struct spi_master *master = dev_get_drvdata(&pdev->dev); + struct omap2_mcspi *mcspi = spi_master_get_devdata(master); + struct omap2_mcspi_cs *cs; + + omap2_mcspi_enable_clocks(mcspi); + list_for_each_entry(cs, &omap2_mcspi_ctx[master->bus_num - 1].cs, + node) { + if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) { + + /* We need to toggle CS state for OMAP take this + * change in account. + */ + MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 1); + __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); + MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 0); + __raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0); + } + } + omap2_mcspi_disable_clocks(mcspi); + return 0; +} +#else +#define omap2_mcspi_resume NULL +#endif + static struct platform_driver omap2_mcspi_driver = { .driver = { .name = "omap2_mcspi", .owner = THIS_MODULE, }, + .resume = omap2_mcspi_resume, .remove = __exit_p(omap2_mcspi_remove), }; -- 1.7.0.4