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SubjectRe: [PATCH V3] mmc: tegra: add sdhci tegra suspend and resume
On Wed, 3 Apr 2019 at 17:39, Sowjanya Komatineni <skomatineni@nvidia.com> wrote:
>
> This patch adds suspend and resume PM ops for tegra SDHCI.
>
> Acked-by: Thierry Reding <treding@nvidia.com>
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
> drivers/mmc/host/sdhci-tegra.c | 56 +++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 55 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index eafaaefab4a6..5ec304166566 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -1611,11 +1611,65 @@ static int sdhci_tegra_remove(struct platform_device *pdev)
> return 0;
> }
>

sdhci_suspend_host() exists only if CONFIG_PM is set. Therefore, I
think it's better to add explicit check for that. So add the ifdef
like below, and a corresponding #endif, after the implementation of
sdhci_tegra_resume().

#ifdef CONFIG_PM_SLEEP

> +static int __maybe_unused 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) {
> + cqhci_resume(host->mmc);
> + return ret;
> + }
> +
> + clk_disable_unprepare(pltfm_host->clk);
> + return 0;
> +}
> +
> +static int __maybe_unused 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;
> +
> + ret = clk_prepare_enable(pltfm_host->clk);
> + if (ret)
> + return ret;
> +
> + ret = sdhci_resume_host(host);
> + if (ret)
> + goto disable_clk;
> +
> + if (host->mmc->caps2 & MMC_CAP2_CQE) {
> + ret = cqhci_resume(host->mmc);
> + if (ret)
> + goto suspend_host;
> + }
> +
> + return 0;
> +
> +suspend_host:
> + sdhci_suspend_host(host);
> +disable_clk:
> + clk_disable_unprepare(pltfm_host->clk);
> + return ret;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(sdhci_tegra_dev_pm_ops, sdhci_tegra_suspend,
> + sdhci_tegra_resume);
> +
> static struct platform_driver sdhci_tegra_driver = {
> .driver = {
> .name = "sdhci-tegra",
> .of_match_table = sdhci_tegra_dt_match,
> - .pm = &sdhci_pltfm_pmops,
> + .pm = &sdhci_tegra_dev_pm_ops,
> },
> .probe = sdhci_tegra_probe,
> .remove = sdhci_tegra_remove,
> --
> 2.7.4
>

Otherwise this looks good to me.

Kind regards
Uffe

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