linux-kernel - Re: [PATCH V1] mmc: sdhci-msm: Add system suspend/resume callbacks

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Date:   Tue, 21 Jan 2020 15:25:58 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Shaik Sajida Bhanu <sbhanu@...eaurora.org>
Cc:     ulf.hansson@...aro.org, adrian.hunter@...el.com,
        asutoshd@...eaurora.org, stummala@...eaurora.org,
        vbadigan@...eaurora.org, sayalil@...eaurora.org,
        cang@...eaurora.org, rampraka@...eaurora.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, agross@...nel.org,
        bjorn.andersson@...aro.org
Subject: Re: [PATCH V1] mmc: sdhci-msm: Add system suspend/resume callbacks

Hi Shaik,

On Tue, Jan 21, 2020 at 08:00:22PM +0530, Shaik Sajida Bhanu wrote:
> Add system suspend/resume callbacks to sdhci-msm platform driver.
> 
> Signed-off-by: Shaik Sajida Bhanu <sbhanu@...eaurora.org>
> ---
>  drivers/mmc/host/sdhci-msm.c | 47 ++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 45 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 71f29ba..4984857 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -2028,9 +2028,52 @@ 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);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> +	int ret = 0;

initialization is not needed.

> +
> +	if (host->mmc->caps2 & MMC_CAP2_CQE) {
> +		ret = cqhci_suspend(host->mmc);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	disable_irq(msm_host->pwr_irq);
> +	ret = sdhci_suspend_host(host);
> +	if (ret)
> +		return ret;
> +
> +	return sdhci_msm_runtime_suspend(dev);
> +}
> +
> +static int sdhci_msm_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 = 0;

initialization is not needed.

> +	ret = sdhci_msm_runtime_resume(dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = sdhci_resume_host(host);
> +	if (ret < 0)
> +		return ret;
> +	enable_irq(msm_host->pwr_irq);
> +
> +	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)