Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754244AbcJUIWZ (ORCPT ); Fri, 21 Oct 2016 04:22:25 -0400 Received: from mail-qt0-f177.google.com ([209.85.216.177]:35559 "EHLO mail-qt0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754143AbcJUIWW (ORCPT ); Fri, 21 Oct 2016 04:22:22 -0400 MIME-Version: 1.0 In-Reply-To: <20161021064204.10889-1-pramod.gurav@linaro.org> References: <20161021064204.10889-1-pramod.gurav@linaro.org> From: Ulf Hansson Date: Fri, 21 Oct 2016 10:22:20 +0200 Message-ID: Subject: Re: [PATCH v5] mmc: sdhci-msm: Add pm_runtime and system PM support To: Pramod Gurav Cc: Adrian Hunter , linux-mmc , "linux-kernel@vger.kernel.org" , "linux-arm-msm@vger.kernel.org" , "linux-pm@vger.kernel.org" , Harjani Ritesh Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5586 Lines: 164 On 21 October 2016 at 08:42, Pramod Gurav wrote: > Provides runtime PM callbacks to enable and disable clock resources > when idle. Also support system PM callbacks to be called during system > suspend and resume. > > Reviewed-by: Ritesh Harjani > Reviewed-by: Georgi Djakov > Tested-by: Ritesh Harjani > Signed-off-by: Pramod Gurav Thanks, applied for next! Kind regards Uffe > --- > Tested on DB410C. > > Changes in v5: > - Added pm_runtime_mark_last_busy in probe before calling autosuspend > - included clock names in error logs > - Used micro instead of constant for autosuspend delay > - Removed platform_set_drvdata in probe as sdhci_pltfm_init does it. > - Aligned PM ops structure with the parenthesis > > Changes in v4: > - Remove calls to sdhci_runtime_resume_host/sdhci_runtime_suspend_host > from runtime callbacks as sdhc msm controller is capable of restoring > it's register values after clocks are disabled and re-enabled. > > Changes in v3: > - Added CONFIG_PM around runtime pm function. > - Replaced msm suspend/resume with generic function directly > - Use SET_SYSTEM_SLEEP_PM_OPS instead of late version > > Changes in v2: > - Moved pm_rutime enabling before adding host > - Handled pm_rutime in remove > - Changed runtime handling with reference from sdhci-of-at91.c > > drivers/mmc/host/sdhci-msm.c | 68 +++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 67 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > index 8ef44a2a..795f16f 100644 > --- a/drivers/mmc/host/sdhci-msm.c > +++ b/drivers/mmc/host/sdhci-msm.c > @@ -18,6 +18,7 @@ > #include > #include > #include > +#include > #include > > #include "sdhci-pltfm.h" > @@ -68,6 +69,7 @@ > #define CMUX_SHIFT_PHASE_SHIFT 24 > #define CMUX_SHIFT_PHASE_MASK (7 << CMUX_SHIFT_PHASE_SHIFT) > > +#define MSM_MMC_AUTOSUSPEND_DELAY_MS 50 > struct sdhci_msm_host { > struct platform_device *pdev; > void __iomem *core_mem; /* MSM SDCC mapped address */ > @@ -658,12 +660,26 @@ static int sdhci_msm_probe(struct platform_device *pdev) > goto clk_disable; > } > > + pm_runtime_get_noresume(&pdev->dev); > + pm_runtime_set_active(&pdev->dev); > + pm_runtime_enable(&pdev->dev); > + pm_runtime_set_autosuspend_delay(&pdev->dev, > + MSM_MMC_AUTOSUSPEND_DELAY_MS); > + pm_runtime_use_autosuspend(&pdev->dev); > + > ret = sdhci_add_host(host); > if (ret) > - goto clk_disable; > + goto pm_runtime_disable; > + > + pm_runtime_mark_last_busy(&pdev->dev); > + pm_runtime_put_autosuspend(&pdev->dev); > > return 0; > > +pm_runtime_disable: > + pm_runtime_disable(&pdev->dev); > + pm_runtime_set_suspended(&pdev->dev); > + pm_runtime_put_noidle(&pdev->dev); > clk_disable: > clk_disable_unprepare(msm_host->clk); > pclk_disable: > @@ -685,6 +701,11 @@ static int sdhci_msm_remove(struct platform_device *pdev) > 0xffffffff); > > sdhci_remove_host(host, dead); > + > + pm_runtime_get_sync(&pdev->dev); > + pm_runtime_disable(&pdev->dev); > + pm_runtime_put_noidle(&pdev->dev); > + > clk_disable_unprepare(msm_host->clk); > clk_disable_unprepare(msm_host->pclk); > if (!IS_ERR(msm_host->bus_clk)) > @@ -693,12 +714,57 @@ static int sdhci_msm_remove(struct platform_device *pdev) > return 0; > } > > +#ifdef CONFIG_PM > +static int sdhci_msm_runtime_suspend(struct device *dev) > +{ > + struct sdhci_host *host = dev_get_drvdata(dev); > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); > + > + clk_disable_unprepare(msm_host->clk); > + clk_disable_unprepare(msm_host->pclk); > + > + return 0; > +} > + > +static int sdhci_msm_runtime_resume(struct device *dev) > +{ > + struct sdhci_host *host = dev_get_drvdata(dev); > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); > + int ret; > + > + ret = clk_prepare_enable(msm_host->clk); > + if (ret) { > + dev_err(dev, "clk_enable failed for core_clk: %d\n", ret); > + return ret; > + } > + ret = clk_prepare_enable(msm_host->pclk); > + if (ret) { > + dev_err(dev, "clk_enable failed for iface_clk: %d\n", ret); > + clk_disable_unprepare(msm_host->clk); > + return ret; > + } > + > + return 0; > +} > +#endif > + > +static const struct dev_pm_ops sdhci_msm_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, > + pm_runtime_force_resume) > + SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend, > + sdhci_msm_runtime_resume, > + NULL) > +}; > + > static struct platform_driver sdhci_msm_driver = { > .probe = sdhci_msm_probe, > .remove = sdhci_msm_remove, > .driver = { > .name = "sdhci_msm", > .of_match_table = sdhci_msm_dt_match, > + .pm = &sdhci_msm_pm_ops, > }, > }; > > -- > 2.9.3 >