[regression] mhi: ath11k resume fails on some devices

[Kalle Valo]

Manivannan Sadhasivam <manivannan.sadhasivam at linaro.org> writes:

> For aid debugging, please see the state the device is in during mhi_pm_resume().
> You can use below diff:
>
> diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
> index fb99e3727155..482d55dd209e 100644
> --- a/drivers/bus/mhi/core/pm.c
> +++ b/drivers/bus/mhi/core/pm.c
> @@ -898,6 +898,9 @@ int mhi_pm_resume(struct mhi_controller *mhi_cntrl)
>         if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state))
>                 return -EIO;
>  
> +       dev_info(dev, "Device state: %s\n",
> +                TO_MHI_STATE_STR(mhi_get_mhi_state(mhi_cntrl)));
> +
>         if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3)
>                 return -EINVAL;

This is what I get with my NUC testbox:

[  970.488202] ACPI: EC: event unblocked
[  970.492484] hpet: Lost 1587 RTC interrupts
[  970.492749] mhi mhi0: Device state: RESET
[  970.492805] ath11k_pci 0000:06:00.0: failed to set mhi state: RESUME(6)

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