From patchwork Wed Nov 11 18:11:48 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ludovic Desroches X-Patchwork-Id: 7597101 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 [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3063A9F2F7 for ; Wed, 11 Nov 2015 18:13:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DF71E206FA for ; Wed, 11 Nov 2015 18:13:53 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0469A2061C for ; Wed, 11 Nov 2015 18:13:53 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZwZsA-0002hO-No; Wed, 11 Nov 2015 18:11:54 +0000 Received: from eusmtp01.atmel.com ([212.144.249.243]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZwZs6-0002Vk-Ea for linux-arm-kernel@lists.infradead.org; Wed, 11 Nov 2015 18:11:51 +0000 Received: from ibiza.corp.atmel.com (10.161.101.13) by eusmtp01.atmel.com (10.161.101.31) with Microsoft SMTP Server id 14.3.235.1; Wed, 11 Nov 2015 19:11:23 +0100 From: Ludovic Desroches To: Subject: [PATCH v4] mmc: sdhci at91: add PM support Date: Wed, 11 Nov 2015 19:11:48 +0100 Message-ID: <1447265508-8583-1-git-send-email-ludovic.desroches@atmel.com> X-Mailer: git-send-email 2.5.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151111_101150_893884_0955B027 X-CRM114-Status: GOOD ( 12.27 ) X-Spam-Score: -4.5 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nicolas.ferre@atmel.com, Ludovic Desroches , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.5 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 Add runtime PM support and use runtime_force_suspend|resume() for system PM. Signed-off-by: Ludovic Desroches --- Changes: - from v3: add error handling of runtime PM - from v2: cleanup thanks to Ulf feedback - from v1: take a runtime PM centric approach drivers/mmc/host/sdhci-of-at91.c | 72 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 70 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c index 06d0b50..81ab9db 100644 --- a/drivers/mmc/host/sdhci-of-at91.c +++ b/drivers/mmc/host/sdhci-of-at91.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include #include "sdhci-pltfm.h" @@ -51,6 +53,60 @@ static const struct of_device_id sdhci_at91_dt_match[] = { {} }; +#ifdef CONFIG_PM +static int sdhci_at91_runtime_suspend(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_at91_priv *priv = pltfm_host->priv; + int ret; + + ret = sdhci_runtime_suspend_host(host); + + clk_disable_unprepare(priv->gck); + clk_disable_unprepare(priv->hclock); + clk_disable_unprepare(priv->mainck); + + return ret; +} + +static int sdhci_at91_runtime_resume(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_at91_priv *priv = pltfm_host->priv; + int ret; + + ret = clk_prepare_enable(priv->mainck); + if (ret) { + dev_err(dev, "can't enable mainck\n"); + return ret; + } + + ret = clk_prepare_enable(priv->hclock); + if (ret) { + dev_err(dev, "can't enable hclock\n"); + return ret; + } + + ret = clk_prepare_enable(priv->gck); + if (ret) { + dev_err(dev, "can't enable gck\n"); + return ret; + } + + return sdhci_runtime_resume_host(host); +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops sdhci_at91_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(sdhci_at91_runtime_suspend, + sdhci_at91_runtime_resume, + NULL) +}; + static int sdhci_at91_probe(struct platform_device *pdev) { const struct of_device_id *match; @@ -144,12 +200,20 @@ static int sdhci_at91_probe(struct platform_device *pdev) sdhci_get_of_property(pdev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, 50); + pm_runtime_use_autosuspend(&pdev->dev); + ret = sdhci_add_host(host); if (ret) - goto clocks_disable_unprepare; + goto pm_runtime_disable; return 0; +pm_runtime_disable: + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); clocks_disable_unprepare: clk_disable_unprepare(priv->gck); clk_disable_unprepare(priv->mainck); @@ -165,6 +229,10 @@ static int sdhci_at91_remove(struct platform_device *pdev) struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_at91_priv *priv = pltfm_host->priv; + pm_runtime_get_sync(&pdev->dev); + pm_runtime_disable(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); + sdhci_pltfm_unregister(pdev); clk_disable_unprepare(priv->gck); @@ -178,7 +246,7 @@ static struct platform_driver sdhci_at91_driver = { .driver = { .name = "sdhci-at91", .of_match_table = sdhci_at91_dt_match, - .pm = SDHCI_PLTFM_PMOPS, + .pm = &sdhci_at91_dev_pm_ops, }, .probe = sdhci_at91_probe, .remove = sdhci_at91_remove,