Re: [PATCH] ACPI: PM: s2idle: Always set up EC GPE for system wakeup

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Wed, Aug 21, 2019 at 10:06:09AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Commit 10a08fd65ec1 ("ACPI: PM: Set up EC GPE for system wakeup from
> drivers that need it") assumed that the EC GPE would only need to be
> set up for system wakeup if either the intel-hid or the intel-vbtn
> driver was in use, but that turns out to be incorrect.  In particular,
> on ASUS Zenbook UX430UNR/i7-8550U, if the EC GPE is not enabled while
> suspended, the system cannot be woken up by opening the lid or
> pressing a key, and that machine doesn't use any of the drivers
> mentioned above.
> 
> For this reason, always set up the EC GPE for system wakeup from
> suspend-to-idle by setting and clearing its wake mask in the ACPI
> suspend-to-idle callbacks.

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Couple of minor comments below.

> Fixes: 10a08fd65ec1 ("ACPI: PM: Set up EC GPE for system wakeup from drivers that need it")
> Reported-by: Kristian Klausen <kristian@klausen.dk>
> Tested-by: Kristian Klausen <kristian@klausen.dk>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
> 
> Commit 10a08fd65ec1 is present in linux-next.
> 
> ---
>  drivers/acpi/ec.c                 |    1 -
>  drivers/acpi/sleep.c              |   15 +++++++++++++--
>  drivers/platform/x86/intel-hid.c  |    5 +----
>  drivers/platform/x86/intel-vbtn.c |    5 +----
>  4 files changed, 15 insertions(+), 11 deletions(-)
> 
> Index: linux-pm/drivers/acpi/sleep.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/sleep.c
> +++ linux-pm/drivers/acpi/sleep.c
> @@ -938,6 +938,13 @@ static int lps0_device_attach(struct acp
>  	if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
>  		mem_sleep_current = PM_SUSPEND_TO_IDLE;
>  
> +	/*
> +	 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
> +	 * EC GPE to be enabled while suspended for certain wakeup devices to
> +	 * work, so mark it as wakeup-capable.
> +	 */
> +	acpi_ec_mark_gpe_for_wake();
> +
>  	return 0;
>  }
>  
> @@ -954,8 +961,10 @@ static int acpi_s2idle_begin(void)
>  
>  static int acpi_s2idle_prepare(void)
>  {
> -	if (acpi_sci_irq_valid())
> +	if (acpi_sci_irq_valid()) {
>  		enable_irq_wake(acpi_sci_irq);
> +		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
> +	}
>  
>  	acpi_enable_wakeup_devices(ACPI_STATE_S0);
>  
> @@ -1034,8 +1043,10 @@ static void acpi_s2idle_restore(void)
>  
>  	acpi_disable_wakeup_devices(ACPI_STATE_S0);
>  
> -	if (acpi_sci_irq_valid())
> +	if (acpi_sci_irq_valid()) {
> +		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
>  		disable_irq_wake(acpi_sci_irq);
> +	}
>  }
>  
>  static void acpi_s2idle_end(void)
> Index: linux-pm/drivers/platform/x86/intel-hid.c
> ===================================================================
> --- linux-pm.orig/drivers/platform/x86/intel-hid.c
> +++ linux-pm/drivers/platform/x86/intel-hid.c
> @@ -257,7 +257,6 @@ static int intel_hid_pm_prepare(struct d
>  		struct intel_hid_priv *priv = dev_get_drvdata(device);
>  
>  		priv->wakeup_mode = true;
> -		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
>  	}
>  	return 0;
>  }
> @@ -266,10 +265,8 @@ static void intel_hid_pm_complete(struct
>  {
>  	struct intel_hid_priv *priv = dev_get_drvdata(device);
>  
> -	if (priv->wakeup_mode) {
> -		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);

> +	if (priv->wakeup_mode)

But this now seems does not add any value and we can assign unconditionally.

>  		priv->wakeup_mode = false;
> -	}
>  }
>  
>  static int intel_hid_pl_suspend_handler(struct device *device)
> Index: linux-pm/drivers/platform/x86/intel-vbtn.c
> ===================================================================
> --- linux-pm.orig/drivers/platform/x86/intel-vbtn.c
> +++ linux-pm/drivers/platform/x86/intel-vbtn.c
> @@ -205,7 +205,6 @@ static int intel_vbtn_pm_prepare(struct
>  		struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
>  
>  		priv->wakeup_mode = true;
> -		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
>  	}
>  	return 0;
>  }
> @@ -214,10 +213,8 @@ static void intel_vbtn_pm_complete(struc
>  {
>  	struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
>  
> -	if (priv->wakeup_mode) {
> -		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);

> +	if (priv->wakeup_mode)

Ditto.

>  		priv->wakeup_mode = false;
> -	}
>  }
>  
>  static int intel_vbtn_pm_resume(struct device *dev)
> Index: linux-pm/drivers/acpi/ec.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/ec.c
> +++ linux-pm/drivers/acpi/ec.c
> @@ -1970,7 +1970,6 @@ void acpi_ec_set_gpe_wake_mask(u8 action
>  	if (pm_suspend_no_platform() && first_ec && !ec_no_wakeup)
>  		acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);
>  }
> -EXPORT_SYMBOL_GPL(acpi_ec_set_gpe_wake_mask);
>  
>  bool acpi_ec_dispatch_gpe(void)
>  {

-- 
With Best Regards,
Andy Shevchenko