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: 2848333 Return-Path: X-Original-To: patchwork-linux-samsung-soc@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 752B1BF546 for ; Thu, 22 Aug 2013 16:25:06 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B438D204EA for ; Thu, 22 Aug 2013 16:25:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 47E5D20421 for ; Thu, 22 Aug 2013 16:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753138Ab3HVQY7 (ORCPT ); Thu, 22 Aug 2013 12:24:59 -0400 Received: from mail-qa0-f73.google.com ([209.85.216.73]:39726 "EHLO mail-qa0-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753026Ab3HVQY7 (ORCPT ); Thu, 22 Aug 2013 12:24:59 -0400 Received: by mail-qa0-f73.google.com with SMTP id o13so79166qaj.0 for ; Thu, 22 Aug 2013 09:24:58 -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=fG8sAKDdUWW/U/MdB6NqWSJ4IrJOY0ed2hGyn6rMJ5KuWw7hiC41PdRRQMAyyaKTuZ wl2lQHRVnkDz5Auo1SDAeaT8dykgmKKrY2+fd1QsFR6Z/5ttsEbw1xcY0RGwFgz08s7e syeGSDo8TFEEatQbjzJ4zBxuGbmE/8ZzX+8PLl5dD2qO23qw+jT3KcJvJIByuXH/NqW8 Ka3wWdx3ArLa3ZjhgUi9mlTQmEtZnitEs/tyP2muvjpMvQd1g+vU7P/IRNE9vG1aUMtX 0TkDb6nkECjNIzRT20b/IDURUQW43juqvQtlZU5ZcPApfuSIUMt38Htog4llBw95oHdd +DdA== X-Gm-Message-State: ALoCoQl3czxi9oL/8wH7+4il+JTj9ct3HkdTnLPrNoml0WR11VdMq/DVUj22JAojfJyE6EqaWg5fC/YQQ+2bYka/noiZz1dEZgGZhP20viiUU/UlNCfJgg2EkA5MypoFHt7hnK5djitg7VjPWEf5mn3rDf4xzCLH6bf+2iqNs4nQHe1K7AAW6vYRDn0ThQLQ9CszI98TDdbUNZ8lVR6IG1/5C0NyBzWMyA== 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 Cc: Jaehoon Chung , Seungwon Jeon , James Hogan , Grant Grundler , Alim Akhtar , Abhilash Kesavan , Tomasz Figa , Olof Johansson , Doug Anderson , Kukjin Kim , linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org 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> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-9.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, 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, }, };