[PATCH v5 1/6] mei: mei-me: resume device in prepare

[Winkler, Tomas]

> 
> From: Alexander Usyskin <alexander.usyskin at intel.com>
> 
> Asynchronous runtime resume is not possible while the system is
> suspending.
> The power management subsystem resumes the device only in the suspend
> phase, not in the prepare phase.
> Force resume device in prepare to allow drivers on mei bus to communicate
> in their prepare callbacks.
> 
> Signed-off-by: Alexander Usyskin <alexander.usyskin at intel.com>
> Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
Reviewed-by: Tomas Winkler <tomas.winkler at intel.com>
> ---
>  drivers/misc/mei/pci-me.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c index
> 704cd0caa172..9f6ff06a94fd 100644
> --- a/drivers/misc/mei/pci-me.c
> +++ b/drivers/misc/mei/pci-me.c
> @@ -340,6 +340,12 @@ static void mei_me_remove(struct pci_dev *pdev)  }
> 
>  #ifdef CONFIG_PM_SLEEP
> +static int mei_me_pci_prepare(struct device *device) {
> +	pm_runtime_resume(device);
> +	return 0;
> +}
> +
>  static int mei_me_pci_suspend(struct device *device)  {
>  	struct pci_dev *pdev = to_pci_dev(device); @@ -396,7 +402,17 @@
> static int mei_me_pci_resume(struct device *device)
> 
>  	return 0;
>  }
> -#endif /* CONFIG_PM_SLEEP */
> +
> +static void mei_me_pci_complete(struct device *device) {
> +	pm_runtime_suspend(device);
> +}
> +#else /* CONFIG_PM_SLEEP */
> +
> +#define mei_me_pci_prepare NULL
> +#define mei_me_pci_complete NULL
> +
> +#endif /* !CONFIG_PM_SLEEP */
> 
>  #ifdef CONFIG_PM
>  static int mei_me_pm_runtime_idle(struct device *device) @@ -499,6
> +515,8 @@ static inline void mei_me_unset_pm_domain(struct mei_device
> *dev)  }
> 
>  static const struct dev_pm_ops mei_me_pm_ops = {
> +	.prepare = mei_me_pci_prepare,
> +	.complete = mei_me_pci_complete,
>  	SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
>  				mei_me_pci_resume)
>  	SET_RUNTIME_PM_OPS(
> --
> 2.39.0