From patchwork Thu Aug 22 16:19:06 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 2848329 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 B22849F2F6 for ; Thu, 22 Aug 2013 16:20:44 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EAD9D201E0 for ; Thu, 22 Aug 2013 16:20:39 +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 129C3201D6 for ; Thu, 22 Aug 2013 16:20:35 +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 1VCXcN-0000cb-KH; Thu, 22 Aug 2013 16:20:15 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VCXcF-0004St-C6; Thu, 22 Aug 2013 16:20:07 +0000 Received: from mail-qa0-f74.google.com ([209.85.216.74]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VCXbs-0004PV-53 for linux-arm-kernel@lists.infradead.org; Thu, 22 Aug 2013 16:19:46 +0000 Received: by mail-qa0-f74.google.com with SMTP id hu14so77954qab.5 for ; Thu, 22 Aug 2013 09:19:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=roaj6FKgC3W/hWfYapQOUEXbf+YLaLqEdC7cZl0cK60=; b=g3Xly1kOSvm85/A0k1J/9ULZ1g2mnR4Vfed8Y3nZ5PPaLTPd0z5QpvKxGhTUlkb2bF UAJa3WDDUm+nYtVdnrG1+mejIX45+mmG/HRxE5Be+8dBX2qBcQdOr1e8MnC7xVqsM48Z aFm9oFT9opLoMqCjwv7HOgI63E2WJghP1sJj1KpFAS6YHXYbQyLIfyM86iVzPDfrPt3X b0Uu2YaFtt6npuvWsW+GTwH19057aMGq5TDFEgWhgRZtnulMEvmAaOExg/qphdNqWcNy 3DJ8wrY/3bgC8hxueUySFa4ojy63ra01QIkZNPiRU03YBLuu6MMC5KAk0qmt64yo1BZ1 Ijsg== X-Gm-Message-State: ALoCoQlOq5MJDrK7g7HZMt8meOf7SQ4Aiz8iMw4u62u4ScIEPtVhLoWyFNd3vK3Qz8SqU2fbyD+7IDPloYAcqC1gF2g2TRQnY0l900R3lI4OrfvM48h0xaml9nGeE6aMm8ZLRpantRDBONO/cjXCkdiloP0LLXQ7Byx57qLGshwjKSd8YtgysBtwvJnVRKeNfmfkq07UiW9lvKmfXidwIz6WcttyqR8ABQ== X-Received: by 10.236.115.198 with SMTP id e46mr5014989yhh.33.1377188359642; Thu, 22 Aug 2013 09:19:19 -0700 (PDT) Received: from corp2gmr1-2.hot.corp.google.com (corp2gmr1-2.hot.corp.google.com [172.24.189.93]) by gmr-mx.google.com with ESMTPS id h70si897521yhk.2.1969.12.31.16.00.00 (version=TLSv1.1 cipher=AES128-SHA bits=128/128); Thu, 22 Aug 2013 09:19:19 -0700 (PDT) Received: from tictac.mtv.corp.google.com (tictac.mtv.corp.google.com [172.22.162.34]) by corp2gmr1-2.hot.corp.google.com (Postfix) with ESMTP id 5325A5A421F; Thu, 22 Aug 2013 09:19:19 -0700 (PDT) Received: by tictac.mtv.corp.google.com (Postfix, from userid 121310) id ED46B80912; Thu, 22 Aug 2013 09:19:18 -0700 (PDT) From: Doug Anderson To: Chris Ball Subject: [PATCH v6 1/3] mmc: dw_mmc: Add exynos resume_noirq callback to clear WAKEUP_INT Date: Thu, 22 Aug 2013 09:19:06 -0700 Message-Id: <1377188348-3418-2-git-send-email-dianders@chromium.org> X-Mailer: git-send-email 1.8.3 In-Reply-To: <1377188348-3418-1-git-send-email-dianders@chromium.org> References: <1377188348-3418-1-git-send-email-dianders@chromium.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130822_121944_313339_42925880 X-CRM114-Status: GOOD ( 17.06 ) X-Spam-Score: -5.4 (-----) Cc: linux-samsung-soc@vger.kernel.org, James Hogan , Seungwon Jeon , linux-kernel@vger.kernel.org, Olof Johansson , linux-mmc@vger.kernel.org, Tomasz Figa , Doug Anderson , Jaehoon Chung , Grant Grundler , Kukjin Kim , Alim Akhtar , Abhilash Kesavan , 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: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, 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 If the WAKEUP_INT is asserted at wakeup and not cleared, we'll end up looping around forever. This has been seen to happen on exynos5420 silicon despite the fact that we haven't enabled any wakeup events due to a silicon errata. It is safe to do on all exynos variants. Signed-off-by: Doug Anderson --- Changes in v6: - Took out TODO comment copied from main platform code. Changes in v5: - Cleaned up dw_mci_exynos_resume_noirq() comment as per Seungwon. - Don't memcpy dev_pm_ops structure, define a new one. Changes in v4: - Take Seungwon's suggestion and don't add any dw_mmc-pltfm code. Changes in v3: - Add freeze/thaw and poweroff/restore noirq entries. Changes in v2: - Use suspend_noirq as per James Hogan. drivers/mmc/host/dw_mmc-exynos.c | 53 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c index 866edef..e8c6cc9 100644 --- a/drivers/mmc/host/dw_mmc-exynos.c +++ b/drivers/mmc/host/dw_mmc-exynos.c @@ -30,6 +30,7 @@ #define SDMMC_CLKSEL_TIMING(x, y, z) (SDMMC_CLKSEL_CCLK_SAMPLE(x) | \ SDMMC_CLKSEL_CCLK_DRIVE(y) | \ SDMMC_CLKSEL_CCLK_DIVIDER(z)) +#define SDMMC_CLKSEL_WAKEUP_INT BIT(11) #define EXYNOS4210_FIXED_CIU_CLK_DIV 2 #define EXYNOS4412_FIXED_CIU_CLK_DIV 4 @@ -100,6 +101,49 @@ static int dw_mci_exynos_setup_clock(struct dw_mci *host) return 0; } +#ifdef CONFIG_PM_SLEEP +static int dw_mci_exynos_suspend(struct device *dev) +{ + struct dw_mci *host = dev_get_drvdata(dev); + + return dw_mci_suspend(host); +} + +static int dw_mci_exynos_resume(struct device *dev) +{ + struct dw_mci *host = dev_get_drvdata(dev); + + return dw_mci_resume(host); +} + +/** + * dw_mci_exynos_resume_noirq - Exynos-specific resume code + * + * On exynos5420 there is a silicon errata that will sometimes leave the + * WAKEUP_INT bit in the CLKSEL register asserted. This bit is 1 to indicate + * that it fired and we can clear it by writing a 1 back. Clear it to prevent + * interrupts from going off constantly. + * + * We run this code on all exynos variants because it doesn't hurt. + */ + +static int dw_mci_exynos_resume_noirq(struct device *dev) +{ + struct dw_mci *host = dev_get_drvdata(dev); + u32 clksel; + + clksel = mci_readl(host, CLKSEL); + if (clksel & SDMMC_CLKSEL_WAKEUP_INT) + mci_writel(host, CLKSEL, clksel); + + return 0; +} +#else +#define dw_mci_exynos_suspend NULL +#define dw_mci_exynos_resume NULL +#define dw_mci_exynos_resume_noirq NULL +#endif /* CONFIG_PM_SLEEP */ + static void dw_mci_exynos_prepare_command(struct dw_mci *host, u32 *cmdr) { /* @@ -187,13 +231,20 @@ static int dw_mci_exynos_probe(struct platform_device *pdev) return dw_mci_pltfm_register(pdev, drv_data); } +const struct dev_pm_ops dw_mci_exynos_pmops = { + SET_SYSTEM_SLEEP_PM_OPS(dw_mci_exynos_suspend, dw_mci_exynos_resume) + .resume_noirq = dw_mci_exynos_resume_noirq, + .thaw_noirq = dw_mci_exynos_resume_noirq, + .restore_noirq = dw_mci_exynos_resume_noirq, +}; + static struct platform_driver dw_mci_exynos_pltfm_driver = { .probe = dw_mci_exynos_probe, .remove = __exit_p(dw_mci_pltfm_remove), .driver = { .name = "dwmmc_exynos", .of_match_table = dw_mci_exynos_match, - .pm = &dw_mci_pltfm_pmops, + .pm = &dw_mci_exynos_pmops, }, };