linux-kernel - Re: [PATCH] mmc: tegra: Enable wake on SD card event

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Date:   Thu, 13 Jan 2022 08:44:08 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Aniruddha Rao <anrao@...dia.com>, ulf.hansson@...aro.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        p.zabel@...gutronix.de
Cc:     linux-mmc@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: tegra: Enable wake on SD card event

On 13/01/2022 07:16, Aniruddha Rao wrote:
> Enable GPIO wake source on SD card detect line.
> Physical card insertion/removal event should wake the system
> from suspend.
> 
> Signed-off-by: Aniruddha Rao <anrao@...dia.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-tegra.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 35ebba0..5c84bd5 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -1673,6 +1673,9 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
>  	/* HW busy detection is supported, but R1B responses are required. */
>  	host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_NEED_RSP_BUSY;
>  
> +	/* GPIO CD can be set as a wakeup source */
> +	host->mmc->caps |= MMC_CAP_CD_WAKE;
> +
>  	tegra_sdhci_parse_dt(host);
>  
>  	tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power",
> @@ -1840,7 +1843,7 @@ static int sdhci_tegra_suspend(struct device *dev)
>  		return ret;
>  	}
>  
> -	return 0;
> +	return mmc_gpio_set_cd_wake(host->mmc, true);
>  }
>  
>  static int sdhci_tegra_resume(struct device *dev)
> @@ -1848,6 +1851,10 @@ static int sdhci_tegra_resume(struct device *dev)
>  	struct sdhci_host *host = dev_get_drvdata(dev);
>  	int ret;
>  
> +	ret = mmc_gpio_set_cd_wake(host->mmc, false);
> +	if (ret)
> +		return ret;
> +
>  	ret = pm_runtime_force_resume(dev);
>  	if (ret)
>  		return ret;
>