From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Trimarchi Subject: [PATCH 3/3] mmc: sdhci-esdhc-imx: Enable/Disable mmc clock during runtime suspend Date: Thu, 4 Jan 2018 16:30:59 +0100 Message-ID: <1515079859-18401-3-git-send-email-michael@amarulasolutions.com> References: <1515079859-18401-1-git-send-email-michael@amarulasolutions.com> Return-path: Received: from mail-wr0-f195.google.com ([209.85.128.195]:33525 "EHLO mail-wr0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753120AbeADPbG (ORCPT ); Thu, 4 Jan 2018 10:31:06 -0500 Received: by mail-wr0-f195.google.com with SMTP id p6so1810468wrd.0 for ; Thu, 04 Jan 2018 07:31:05 -0800 (PST) In-Reply-To: <1515079859-18401-1-git-send-email-michael@amarulasolutions.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Ulf Hansson Cc: Michael Trimarchi , linux-mmc@vger.kernel.org, Adrian Hunter mmc clock can be stopped during runtime suspend and restart during runtime resume if the sdio irq is not enabled. Stop sdio clock reduce EMI of the device when the bus is not in use. Signed-off-by: Michael Trimarchi --- Changes V2->V3: - move clock re-order on a separated patch Changes V1->V2: - rebase to latest linux - address sdio irq wakeup - move the clock enable clk_ahb up to be balance with the runtime suspend function and to make function more clean by the end without two if condition --- drivers/mmc/host/sdhci-esdhc-imx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 6d4e323..53cc1b6 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -193,6 +193,7 @@ 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 */ @@ -1396,6 +1397,8 @@ static int sdhci_esdhc_runtime_suspend(struct device *dev) mmc_retune_needed(host->mmc); if (!sdhci_sdio_irq_enabled(host)) { + imx_data->actual_clock = host->mmc->actual_clock; + esdhc_pltfm_set_clock(host, 0); clk_disable_unprepare(imx_data->clk_per); clk_disable_unprepare(imx_data->clk_ipg); } @@ -1422,6 +1425,7 @@ static int sdhci_esdhc_runtime_resume(struct device *dev) err = clk_prepare_enable(imx_data->clk_ipg); if (err) goto disable_per_clk; + esdhc_pltfm_set_clock(host, imx_data->actual_clock); } err = sdhci_runtime_resume_host(host); -- 2.7.4