Re: [PATCH v2 4/5] mmc: sdhci-esdhc-imx: disable irq during suspend to fix unhandled interrupt

[Frank Li <Frank.li@oss.nxp.com>]

On Thu, Jun 25, 2026 at 06:59:33PM +0800, ziniu.wang_1@oss.nxp.com wrote:
> From: Luke Wang <ziniu.wang_1@nxp.com>
>
> When using WIFI out-of-band wakeup, an "irq xxx: nobody cared" warning
> occurs. This happens because the usdhc interrupt is not disabled during
> system suspend when device_may_wakeup() returns false.
>
> The sequence of events leading to this issue:
> 1. System enters suspend without disabling usdhc interrupt
> (because device_may_wakeup() returns false for usdhc device)
> 2. WIFI out-of-band wakeup triggers system resume via GPIO interrupt
> 3. WIFI sends a Card interrupt before usdhc has fully resumed
> 4. usdhc is still in runtime suspend state and cannot handle the
> interrupt properly
> 5. The unhandled interrupt triggers "nobody cared" warning
>
> Fix this by unconditionally disabling the usdhc interrupt during suspend
> and re-enabling it during resume, regardless of the wakeup capability.
> This ensures no interrupts are processed during the suspend/resume
> transition.

Does it impact the case if WIFI don't use out-of-band wakeup?

Frank
>
> Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
> Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 7fcaecdd4ec6..c4a22e42628e 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -2076,9 +2076,10 @@ static int sdhci_esdhc_suspend(struct device *dev)
>  	if (mmc_card_keep_power(host->mmc) && esdhc_is_usdhc(imx_data))
>  		sdhc_esdhc_tuning_save(host);
>
> +	/* The irqs of imx are not shared. It is safe to disable */
> +	disable_irq(host->irq);
> +
>  	if (device_may_wakeup(dev)) {
> -		/* The irqs of imx are not shared. It is safe to disable */
> -		disable_irq(host->irq);
>  		ret = sdhci_enable_irq_wakeups(host);
>  		if (!ret)
>  			dev_warn(dev, "Failed to enable irq wakeup\n");
> @@ -2129,10 +2130,10 @@ static int sdhci_esdhc_resume(struct device *dev)
>  	/* re-initialize hw state in case it's lost in low power mode */
>  	sdhci_esdhc_imx_hwinit(host);
>
> -	if (host->irq_wake_enabled) {
> +	if (host->irq_wake_enabled)
>  		sdhci_disable_irq_wakeups(host);
> -		enable_irq(host->irq);
> -	}
> +
> +	enable_irq(host->irq);
>
>  	/*
>  	 * restore the saved tuning delay value for the device which keep
> --
> 2.34.1
>
>