linux-kernel - Re: [PATCH V3] mmc: sdhci-msm: Update system suspend/resume callbacks of sdhci-msm platform driver

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Message-ID: <e4424388-2c6c-7736-da45-7b3b20b9ebbd@intel.com>
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)
>