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

[Tony Lindgren]

* Tony Lindgren <tony at atomide.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