linux-kernel - Re: [PATCH] bus: ti-sysc: Fix am335x resume hang for usb otg module

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Date:   Tue, 18 May 2021 09:50:22 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     linux-omap@...r.kernel.org
Cc:     Dave Gerlach <d-gerlach@...com>, Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Keerthy <j-keerthy@...com>, Nishanth Menon <nm@...com>,
        Suman Anna <s-anna@...com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] bus: ti-sysc: Fix am335x resume hang for usb otg module

* Tony Lindgren <tony@...mide.com> [210429 10:45]:
> --- a/drivers/bus/ti-sysc.c
> +++ b/drivers/bus/ti-sysc.c
> @@ -1308,7 +1314,23 @@ static int __maybe_unused sysc_noirq_resume(struct device *dev)
>  	    (SYSC_QUIRK_LEGACY_IDLE | SYSC_QUIRK_NO_IDLE))
>  		return 0;
>  
> -	return pm_runtime_force_resume(dev);
> +	/* Only enable module if it was on, or needs to be reinitialized */
> +	if (ddata->needs_resume ||
> +	    ddata->cfg.quirks & SYSC_QUIRK_REINIT_ON_RESUME) {
> +		error = sysc_runtime_resume(dev);
> +		if (error)
> +			dev_warn(dev, "noirq_resume failed: %i\n", error);
> +	}
> +
> +	/* Idle quirky module again if it was not on before suspend */
> +	if (ddata->cfg.quirks & SYSC_QUIRK_REINIT_ON_RESUME &&
> +	    !ddata->needs_resume) {
> +		error = sysc_runtime_suspend(dev);
> +	}
> +
> +	ddata->needs_resume = 0;
> +
> +	return error;
>  }

Best to set this up as a separate function, otherwise cpu_pm won't
be able to use it eventually. I'll send out v2.

Regards,

Tony