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Date: Tue, 18 Feb 2020 11:12:20 +0200 From: Adrian Hunter <adrian.hunter@...el.com> To: Shaik Sajida Bhanu <sbhanu@...eaurora.org>, ulf.hansson@...aro.org, robh+dt@...nel.org, mka@...omium.org Cc: asutoshd@...eaurora.org, swboyd@...gle.com, stummala@...eaurora.org, sayalil@...eaurora.org, cang@...eaurora.org, vbadigan@...eaurora.org, rampraka@...eaurora.org, linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, agross@...nel.org, bjorn.andersson@...aro.org Subject: Re: [PATCH V3] mmc: sdhci-msm: Update system suspend/resume callbacks of sdhci-msm platform driver On 12/02/20 9:31 am, Shaik Sajida Bhanu wrote: > The existing suspend/resume callbacks of sdhci-msm driver are just > gating/un-gating the clocks. During suspend cycle more can be done > like disabling controller, disabling card detection, enabling wake-up events. > > So updating the system pm callbacks for performing these extra > actions besides controlling the clocks. > > Signed-off-by: Shaik Sajida Bhanu <sbhanu@...eaurora.org> > > Changes since V2: > Removed disabling/enabling pwr-irq from system pm ops. > > Changes since V1: > Invoking pm_runtime_force_suspend/resume instead of > sdhci_msm_runtime_suepend/resume. > --- > drivers/mmc/host/sdhci-msm.c | 41 +++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 39 insertions(+), 2 deletions(-) > > diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c > index c3a160c..fcff3e8 100644 > --- a/drivers/mmc/host/sdhci-msm.c > +++ b/drivers/mmc/host/sdhci-msm.c > @@ -2159,9 +2159,46 @@ static __maybe_unused int sdhci_msm_runtime_resume(struct device *dev) > return 0; > } > > +static int sdhci_msm_suspend(struct device *dev) > +{ > + struct sdhci_host *host = dev_get_drvdata(dev); > + int ret; > + > + if (host->mmc->caps2 & MMC_CAP2_CQE) { > + ret = cqhci_suspend(host->mmc); > + if (ret) > + return ret; > + } > + > + ret = sdhci_suspend_host(host); > + if (ret) > + return ret; goto resume_cqhci; > + > + return pm_runtime_force_suspend(dev); Ideally there should be an error path e.g. ret = pm_runtime_force_suspend(dev); if (!ret) return ret; sdhci_resume_host() resume_cqhci: cqhci_resume() return ret; > +} > + > +static int sdhci_msm_resume(struct device *dev) > +{ > + struct sdhci_host *host = dev_get_drvdata(dev); > + int ret; > + > + ret = pm_runtime_force_resume(dev); > + if (ret) > + return ret; > + > + ret = sdhci_resume_host(host); > + if (ret < 0) > + return ret; > + > + if (host->mmc->caps2 & MMC_CAP2_CQE) > + ret = cqhci_resume(host->mmc); > + > + return ret; > +} > + > static const struct dev_pm_ops sdhci_msm_pm_ops = { > - SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, > - pm_runtime_force_resume) > + SET_SYSTEM_SLEEP_PM_OPS(sdhci_msm_suspend, > + sdhci_msm_resume) > SET_RUNTIME_PM_OPS(sdhci_msm_runtime_suspend, > sdhci_msm_runtime_resume, > NULL) >
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