From patchwork Tue Mar 17 03:13:53 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chaotian Jing X-Patchwork-Id: 6027201 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 57C8A9F6E8 for ; Tue, 17 Mar 2015 03:18:10 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4776F20458 for ; Tue, 17 Mar 2015 03:18:08 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2E6372045A for ; Tue, 17 Mar 2015 03:18:07 +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 1YXhz0-0004go-2X; Tue, 17 Mar 2015 03:15:54 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YXhy6-0002mx-2X; Tue, 17 Mar 2015 03:15:00 +0000 X-Listener-Flag: 11101 Received: from mtkhts09.mediatek.inc [(172.21.101.70)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 409792292; Tue, 17 Mar 2015 11:14:36 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkhts09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.181.6; Tue, 17 Mar 2015 11:14:34 +0800 From: Chaotian Jing To: Rob Herring , Matthias Brugger , Chris Ball , Ulf Hansson Subject: [PATCH v2 3/5] mmc: mediatek: Add PM support for MMC driver Date: Tue, 17 Mar 2015 11:13:53 +0800 Message-ID: <1426562035-16709-4-git-send-email-chaotian.jing@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1426562035-16709-1-git-send-email-chaotian.jing@mediatek.com> References: <1426562035-16709-1-git-send-email-chaotian.jing@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150316_201458_581043_001AA5CF X-CRM114-Status: GOOD ( 14.17 ) X-Spam-Score: 1.3 (+) Cc: Mark Rutland , James Liao , srv_heupstream@mediatek.com, Arnd Bergmann , devicetree@vger.kernel.org, Hongzhou Yang , Catalin Marinas , bin.zhang@mediatek.com, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Will Deacon , linux-gpio@vger.kernel.org, linux-mediatek@lists.infradead.org, Chaotian Jing , Sascha Hauer , "Joe.C" , Eddie Huang , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_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 PM support for Mediatek MMC driver Signed-off-by: Chaotian Jing --- drivers/mmc/host/mtk-sd.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 93 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c index 86c999b..e02f6a6 100644 --- a/drivers/mmc/host/mtk-sd.c +++ b/drivers/mmc/host/mtk-sd.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -223,6 +224,7 @@ #define MSDC_OCR_AVAIL (MMC_VDD_28_29 | MMC_VDD_29_30 \ | MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33) +#define MTK_MMC_AUTOSUSPEND_DELAY 500 #define CMD_TIMEOUT (HZ/10 * 5) /* 100ms x5 */ #define DAT_TIMEOUT (HZ * 5) /* 1000ms x5 */ @@ -535,6 +537,38 @@ static void msdc_set_mclk(struct msdc_host *host, int ddr, u32 hz) dev_dbg(host->dev, "sclk: %d, ddr: %d\n", host->sclk, ddr); } +#ifdef CONFIG_PM +static int msdc_gate_clock(struct msdc_host *host) +{ + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + /* disable SD/MMC/SDIO bus clock */ + sdr_set_field(host->base + MSDC_CFG, MSDC_CFG_MODE, MSDC_MS); + /* turn off SDHC functional clock */ + clk_disable(host->src_clk); + spin_unlock_irqrestore(&host->lock, flags); + return ret; +} + +static void msdc_ungate_clock(struct msdc_host *host) +{ + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + clk_enable(host->src_clk); + /* enable SD/MMC/SDIO bus clock: + * it will be automatically gated when the bus is idle + * (set MSDC_CFG_CKPDN bit to have it always on) + */ + sdr_set_field(host->base + MSDC_CFG, MSDC_CFG_MODE, MSDC_SDMMC); + while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB)) + cpu_relax(); + spin_unlock_irqrestore(&host->lock, flags); +} +#endif + static inline u32 msdc_cmd_find_resp(struct msdc_host *host, struct mmc_request *mrq, struct mmc_command *cmd) { @@ -702,6 +736,9 @@ static void msdc_request_done(struct msdc_host *host, struct mmc_request *mrq) if (mrq->data) msdc_unprepare_data(host, mrq); mmc_request_done(host->mmc, mrq); + + pm_runtime_mark_last_busy(host->dev); + pm_runtime_put_autosuspend(host->dev); } /* returns true if command is fully handled; returns false otherwise */ @@ -863,6 +900,8 @@ static void msdc_ops_request(struct mmc_host *mmc, struct mmc_request *mrq) } spin_unlock_irqrestore(&host->lock, flags); + pm_runtime_get_sync(host->dev); + if (mrq->data) msdc_prepare_data(host, mrq); @@ -1003,6 +1042,8 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios) if (!IS_ERR(mmc->supply.vqmmc)) { + pm_runtime_get_sync(host->dev); + if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330) { min_uv = 3300000; max_uv = 3300000; @@ -1011,6 +1052,9 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios) max_uv = 1800000; } else { dev_err(host->dev, "Unsupported signal voltage!\n"); + + pm_runtime_mark_last_busy(host->dev); + pm_runtime_put_autosuspend(host->dev); return -EINVAL; } @@ -1022,6 +1066,8 @@ static int msdc_ops_switch_volt(struct mmc_host *mmc, struct mmc_ios *ios) } } + pm_runtime_mark_last_busy(host->dev); + pm_runtime_put_autosuspend(host->dev); return ret; } @@ -1186,6 +1232,8 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) int ret; u32 ddr = 0; + pm_runtime_get_sync(host->dev); + if (ios->timing == MMC_TIMING_UHS_DDR50) ddr = 1; @@ -1230,6 +1278,9 @@ static void msdc_ops_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) if (host->mclk != ios->clock || host->ddr != ddr) msdc_set_mclk(host, ddr, ios->clock); + + pm_runtime_mark_last_busy(host->dev); + pm_runtime_put_autosuspend(host->dev); } static struct mmc_host_ops mt_msdc_ops = { @@ -1341,6 +1392,11 @@ static int msdc_drv_probe(struct platform_device *pdev) platform_set_drvdata(pdev, mmc); clk_prepare(host->src_clk); + pm_runtime_enable(host->dev); + pm_runtime_get_sync(host->dev); + pm_runtime_set_autosuspend_delay(host->dev, MTK_MMC_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(host->dev); + ret = devm_request_irq(&pdev->dev, (unsigned int) host->irq, msdc_irq, IRQF_TRIGGER_LOW | IRQF_ONESHOT, pdev->name, host); if (ret) @@ -1348,10 +1404,15 @@ static int msdc_drv_probe(struct platform_device *pdev) ret = mmc_add_host(mmc); if (ret) - goto release; + goto end; + pm_runtime_mark_last_busy(host->dev); + pm_runtime_put_autosuspend(host->dev); return 0; +end: + pm_runtime_put_sync(host->dev); + pm_runtime_disable(host->dev); release: platform_set_drvdata(pdev, NULL); msdc_deinit_hw(host); @@ -1364,6 +1425,7 @@ release_mem: dma_free_coherent(&pdev->dev, MAX_BD_NUM * sizeof(struct mt_bdma_desc), host->dma.bd, host->dma.bd_addr); + host_free: mmc_free_host(mmc); @@ -1378,10 +1440,14 @@ static int msdc_drv_remove(struct platform_device *pdev) mmc = platform_get_drvdata(pdev); host = mmc_priv(mmc); + pm_runtime_get_sync(host->dev); + platform_set_drvdata(pdev, NULL); mmc_remove_host(host->mmc); msdc_deinit_hw(host); + pm_runtime_put_sync(host->dev); + pm_runtime_disable(host->dev); dma_free_coherent(&pdev->dev, MAX_GPD_NUM * sizeof(struct mt_gpdma_desc), host->dma.gpd, host->dma.gpd_addr); @@ -1393,6 +1459,31 @@ static int msdc_drv_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM +static int msdc_runtime_suspend(struct device *dev) +{ + int ret = 0; + struct mmc_host *mmc = dev_get_drvdata(dev); + struct msdc_host *host = mmc_priv(mmc); + + ret = msdc_gate_clock(host); + return ret; +} + +static int msdc_runtime_resume(struct device *dev) +{ + struct mmc_host *mmc = dev_get_drvdata(dev); + struct msdc_host *host = mmc_priv(mmc); + + msdc_ungate_clock(host); + return 0; +} +#endif + +static const struct dev_pm_ops msdc_dev_pm_ops = { + SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume, NULL) +}; + static const struct of_device_id msdc_of_ids[] = { { .compatible = "mediatek,mt8135-mmc", }, {} @@ -1404,6 +1495,7 @@ static struct platform_driver mt_msdc_driver = { .driver = { .name = "mtk-msdc", .of_match_table = msdc_of_ids, + .pm = &msdc_dev_pm_ops, }, };