From patchwork Thu Mar 5 15:12:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Faiz Abbas X-Patchwork-Id: 11422061 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 95F8D92A for ; Thu, 5 Mar 2020 15:10:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6737D2073D for ; Thu, 5 Mar 2020 15:10:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="dAuliF8Y" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726233AbgCEPKo (ORCPT ); Thu, 5 Mar 2020 10:10:44 -0500 Received: from lelv0143.ext.ti.com ([198.47.23.248]:36108 "EHLO lelv0143.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726131AbgCEPKn (ORCPT ); Thu, 5 Mar 2020 10:10:43 -0500 Received: from lelv0266.itg.ti.com ([10.180.67.225]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 025FAbls002251; Thu, 5 Mar 2020 09:10:37 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1583421037; bh=Ngro9zW0SsWLavCdH7X0E50umfW1jc4G742BvyvMTW8=; h=From:To:CC:Subject:Date; b=dAuliF8YGjjOIPKNYP59YdJ5jPdWIXQ4FoLt3M4L5sJ137gz53xW+VM0AQrhLA4Jd 0EUYrQXdcdrL/EY257ur8k2kWfitG7hFpNeHZI0W3Bai8KPEWuzyvUS4IV4xZwPQBX AhHrUoYqwgz0aBDnc0+EpdhkiQFhu9HjFlgzUcl4= Received: from DLEE109.ent.ti.com (dlee109.ent.ti.com [157.170.170.41]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 025FAbrI082863 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 5 Mar 2020 09:10:37 -0600 Received: from DLEE109.ent.ti.com (157.170.170.41) by DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Thu, 5 Mar 2020 09:10:36 -0600 Received: from localhost.localdomain (10.64.41.19) by DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Thu, 5 Mar 2020 09:10:36 -0600 Received: from a0230074-OptiPlex-7010.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by localhost.localdomain (8.15.2/8.15.2) with ESMTP id 025FAY45114541; Thu, 5 Mar 2020 09:10:34 -0600 From: Faiz Abbas To: , CC: , , , , Subject: [PATCH v2] mmc: sdhci-omap: Add Support for Suspend/Resume Date: Thu, 5 Mar 2020 20:42:28 +0530 Message-ID: <20200305151228.24692-1-faiz_abbas@ti.com> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org Add power management ops which save and restore the driver context and facilitate a system suspend and resume. Signed-off-by: Faiz Abbas --- v2: 1. Save and restore only those registers which are not written to by core 2. Use force_suspend()/resume() APIs instead of runtime_resume()/suspend() as the driver has no runtime PM support. drivers/mmc/host/sdhci-omap.c | 57 +++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c index 882053151a47..989133ec74d6 100644 --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -108,6 +108,11 @@ struct sdhci_omap_host { struct pinctrl *pinctrl; struct pinctrl_state **pinctrl_state; bool is_tuning; + /* Omap specific context save */ + u32 con; + u32 hctl; + u32 sysctl; + u32 capa; }; static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host); @@ -1232,12 +1237,64 @@ static int sdhci_omap_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP +static void sdhci_omap_context_save(struct sdhci_omap_host *omap_host) +{ + omap_host->con = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON); + omap_host->hctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL); + omap_host->capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA); +} + +static void sdhci_omap_context_restore(struct sdhci_omap_host *omap_host) +{ + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con); + sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl); + sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, omap_host->capa); +} + +static int __maybe_unused sdhci_omap_suspend(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); + + sdhci_suspend_host(host); + + sdhci_omap_context_save(omap_host); + + pinctrl_pm_select_idle_state(dev); + + pm_runtime_force_suspend(dev); + + return 0; +} + +static int __maybe_unused sdhci_omap_resume(struct device *dev) +{ + struct sdhci_host *host = dev_get_drvdata(dev); + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host); + + pm_runtime_force_resume(dev); + + pinctrl_pm_select_default_state(dev); + + sdhci_omap_context_restore(omap_host); + + sdhci_resume_host(host); + + return 0; +} +#endif +static SIMPLE_DEV_PM_OPS(sdhci_omap_dev_pm_ops, sdhci_omap_suspend, + sdhci_omap_resume); static struct platform_driver sdhci_omap_driver = { .probe = sdhci_omap_probe, .remove = sdhci_omap_remove, .driver = { .name = "sdhci-omap", + .pm = &sdhci_omap_dev_pm_ops, .of_match_table = omap_sdhci_match, }, };