linux-kernel - Re: [PATCH V1] mmc: tegra: add sdhci tegra suspend and resume

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Date:   Tue, 2 Apr 2019 16:59:01 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        jonathanh@...dia.com, anrao@...dia.com, talho@...dia.com,
        bbiswas@...dia.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH V1] mmc: tegra: add sdhci tegra suspend and resume

On Mon, Apr 01, 2019 at 10:27:33PM -0700, Sowjanya Komatineni wrote:
> This patch adds suspend and resume PM ops for tegra SDHCI.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  drivers/mmc/host/sdhci-tegra.c | 45 +++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 44 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index eafaaefab4a6..68263ea4a93e 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -1611,11 +1611,54 @@ static int sdhci_tegra_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int sdhci_tegra_suspend(struct device *dev)
> +{
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	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;
> +
> +	clk_disable_unprepare(pltfm_host->clk);
> +	return 0;
> +}
> +
> +static int sdhci_tegra_resume(struct device *dev)
> +{
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	int ret;
> +
> +	clk_prepare_enable(pltfm_host->clk);

You need to check this for errors here.

> +
> +	ret = sdhci_resume_host(host);
> +	if (ret)
> +		return ret;

And clk_disable_unprepare() in case of failure.

> +
> +	if (host->mmc->caps2 & MMC_CAP2_CQE)
> +		return cqhci_resume(host->mmc);

Same here. Also make sure to sdhci_suspend_host() if cqhci_resume()
fails. It's probably best to have a standard error cleanup path for
this.

Thierry

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