From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Trimarchi Subject: [PATCH] mmc: sdhci-esdhc-imx: Enable/Disable mmc clock during runtime suspend Date: Thu, 21 Dec 2017 14:22:26 +0100 Message-ID: <1513862546-20221-1-git-send-email-michael@amarulasolutions.com> Return-path: Received: from mail-wr0-f195.google.com ([209.85.128.195]:42833 "EHLO mail-wr0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752407AbdLUNWb (ORCPT ); Thu, 21 Dec 2017 08:22:31 -0500 Received: by mail-wr0-f195.google.com with SMTP id s66so25149823wrc.9 for ; Thu, 21 Dec 2017 05:22:30 -0800 (PST) Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Adrian Hunter Cc: Ulf Hansson , linux-mmc@vger.kernel.org mmc clock can be stopped during runtime suspend and restart during runtime resume. This let us know to not have any clock running and this reduce the EMI of the device when the bus is not in use Signed-off-by: Michael Trimarchi --- drivers/mmc/host/sdhci-esdhc-imx.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 7123ef9..9a5e96f 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -196,6 +196,7 @@ struct pltfm_imx_data { struct clk *clk_ipg; struct clk *clk_ahb; struct clk *clk_per; + unsigned int actual_clock; enum { NO_CMD_PENDING, /* no multiblock command pending*/ MULTIBLK_IN_PROCESS, /* exact multiblock cmd in process */ @@ -1346,6 +1347,9 @@ static int sdhci_esdhc_runtime_suspend(struct device *dev) ret = sdhci_runtime_suspend_host(host); + imx_data->actual_clock = host->mmc->actual_clock; + esdhc_pltfm_set_clock(host, 0); + if (!sdhci_sdio_irq_enabled(host)) { clk_disable_unprepare(imx_data->clk_per); clk_disable_unprepare(imx_data->clk_ipg); @@ -1366,6 +1370,7 @@ static int sdhci_esdhc_runtime_resume(struct device *dev) clk_prepare_enable(imx_data->clk_ipg); } clk_prepare_enable(imx_data->clk_ahb); + esdhc_pltfm_set_clock(host, imx_data->actual_clock); return sdhci_runtime_resume_host(host); } -- 2.7.4