>
> From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
>
> 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@xxxxxxxxx>
> Signed-off-by: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>
Reviewed-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
> ---
> 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
