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Message-ID: <CAHp75VdV-PTfG8Cy673W4r1fFn5h=DQzZe2kHH5_y+HfrA8j6A@mail.gmail.com>
Date:   Fri, 26 Jul 2019 13:40:16 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH 1/4] ACPI: PM: Set up EC GPE for system wakeup from
 drivers that need it

On Fri, Jul 26, 2019 at 1:57 AM Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The EC GPE needs to be set up for system wakeup only if there is a
> driver depending on it, either intel-hid or intel-vbtn, bound to a
> button device that is expected to wake up the system from sleep (such
> as the power button on some Dell systems, like the XPS13 9360).  It
> doesn't need to be set up for waking up the system from sleep in any
> other cases and whether or not it is expected to wake up the system
> from sleep doesn't depend on whether or not the LPS0 device is
> present in the ACPI namespace.
>
> For this reason, rearrange the ACPI suspend-to-idle code to make the
> drivers depending on the EC GPE wakeup take care of setting it up and
> decouple that from the LPS0 device handling.
>
> While at it, make intel-hid and intel-vbtn prepare for system wakeup
> only if they are allowed to wake up the system from sleep by user
> space (via sysfs).
>
> [Note that acpi_ec_mark_gpe_for_wake() and acpi_ec_set_gpe_wake_mask()
>  are there to prevent the EC GPE from being disabled by the
>  acpi_enable_all_wakeup_gpes() call in acpi_s2idle_prepare(), so on
>  systems with either intel-hid or intel-vbtn this change doesn't
>  affect any interactions with the hardware or platform firmware.]
>

Thank you!
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/acpi/ec.c                 |    5 ++++-
>  drivers/acpi/internal.h           |    2 --
>  drivers/acpi/sleep.c              |   11 +----------
>  drivers/platform/x86/intel-hid.c  |   20 ++++++++++++++++----
>  drivers/platform/x86/intel-vbtn.c |   20 ++++++++++++++++----
>  include/linux/acpi.h              |    4 ++++
>  6 files changed, 41 insertions(+), 21 deletions(-)
>
> Index: linux-pm/drivers/acpi/internal.h
> ===================================================================
> --- linux-pm.orig/drivers/acpi/internal.h
> +++ linux-pm/drivers/acpi/internal.h
> @@ -194,8 +194,6 @@ void acpi_ec_ecdt_probe(void);
>  void acpi_ec_dsdt_probe(void);
>  void acpi_ec_block_transactions(void);
>  void acpi_ec_unblock_transactions(void);
> -void acpi_ec_mark_gpe_for_wake(void);
> -void acpi_ec_set_gpe_wake_mask(u8 action);
>  bool acpi_ec_dispatch_gpe(void);
>  int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
>                               acpi_handle handle, acpi_ec_query_func func,
> 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
> @@ -253,9 +253,12 @@ static void intel_button_array_enable(st
>
>  static int intel_hid_pm_prepare(struct device *device)
>  {
> -       struct intel_hid_priv *priv = dev_get_drvdata(device);
> +       if (device_may_wakeup(device)) {
> +               struct intel_hid_priv *priv = dev_get_drvdata(device);
>
> -       priv->wakeup_mode = true;
> +               priv->wakeup_mode = true;
> +               acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
> +       }
>         return 0;
>  }
>
> @@ -270,9 +273,12 @@ static int intel_hid_pl_suspend_handler(
>
>  static int intel_hid_pl_resume_handler(struct device *device)
>  {
> -       struct intel_hid_priv *priv = dev_get_drvdata(device);
> +       if (device_may_wakeup(device)) {
> +               struct intel_hid_priv *priv = dev_get_drvdata(device);
>
> -       priv->wakeup_mode = false;
> +               acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
> +               priv->wakeup_mode = false;
> +       }
>         if (pm_resume_via_firmware()) {
>                 intel_hid_set_enable(device, true);
>                 intel_button_array_enable(device, true);
> @@ -491,6 +497,12 @@ static int intel_hid_probe(struct platfo
>         }
>
>         device_init_wakeup(&device->dev, true);
> +       /*
> +        * In order for system wakeup to work, the EC GPE has to be marked as
> +        * a wakeup one, so do that here (this setting will persist, but it has
> +        * no effect until the wakeup mask is set for the EC GPE).
> +        */
> +       acpi_ec_mark_gpe_for_wake();
>         return 0;
>
>  err_remove_notify:
> 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
> @@ -176,6 +176,12 @@ static int intel_vbtn_probe(struct platf
>                 return -EBUSY;
>
>         device_init_wakeup(&device->dev, true);
> +       /*
> +        * In order for system wakeup to work, the EC GPE has to be marked as
> +        * a wakeup one, so do that here (this setting will persist, but it has
> +        * no effect until the wakeup mask is set for the EC GPE).
> +        */
> +       acpi_ec_mark_gpe_for_wake();
>         return 0;
>  }
>
> @@ -195,17 +201,23 @@ static int intel_vbtn_remove(struct plat
>
>  static int intel_vbtn_pm_prepare(struct device *dev)
>  {
> -       struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
> +       if (device_may_wakeup(dev)) {
> +               struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
>
> -       priv->wakeup_mode = true;
> +               priv->wakeup_mode = true;
> +               acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
> +       }
>         return 0;
>  }
>
>  static int intel_vbtn_pm_resume(struct device *dev)
>  {
> -       struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
> +       if (device_may_wakeup(dev)) {
> +               struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
>
> -       priv->wakeup_mode = false;
> +               acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
> +               priv->wakeup_mode = false;
> +       }
>         return 0;
>  }
>
> Index: linux-pm/include/linux/acpi.h
> ===================================================================
> --- linux-pm.orig/include/linux/acpi.h
> +++ linux-pm/include/linux/acpi.h
> @@ -931,6 +931,8 @@ int acpi_subsys_suspend_noirq(struct dev
>  int acpi_subsys_suspend(struct device *dev);
>  int acpi_subsys_freeze(struct device *dev);
>  int acpi_subsys_poweroff(struct device *dev);
> +void acpi_ec_mark_gpe_for_wake(void);
> +void acpi_ec_set_gpe_wake_mask(u8 action);
>  #else
>  static inline int acpi_subsys_prepare(struct device *dev) { return 0; }
>  static inline void acpi_subsys_complete(struct device *dev) {}
> @@ -939,6 +941,8 @@ static inline int acpi_subsys_suspend_no
>  static inline int acpi_subsys_suspend(struct device *dev) { return 0; }
>  static inline int acpi_subsys_freeze(struct device *dev) { return 0; }
>  static inline int acpi_subsys_poweroff(struct device *dev) { return 0; }
> +static inline void acpi_ec_mark_gpe_for_wake(void) {}
> +static inline void acpi_ec_set_gpe_wake_mask(u8 action) {}
>  #endif
>
>  #ifdef CONFIG_ACPI
> Index: linux-pm/drivers/acpi/ec.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/ec.c
> +++ linux-pm/drivers/acpi/ec.c
> @@ -25,6 +25,7 @@
>  #include <linux/list.h>
>  #include <linux/spinlock.h>
>  #include <linux/slab.h>
> +#include <linux/suspend.h>
>  #include <linux/acpi.h>
>  #include <linux/dmi.h>
>  #include <asm/io.h>
> @@ -1053,12 +1054,14 @@ void acpi_ec_mark_gpe_for_wake(void)
>         if (first_ec && !ec_no_wakeup)
>                 acpi_mark_gpe_for_wake(NULL, first_ec->gpe);
>  }
> +EXPORT_SYMBOL_GPL(acpi_ec_mark_gpe_for_wake);
>
>  void acpi_ec_set_gpe_wake_mask(u8 action)
>  {
> -       if (first_ec && !ec_no_wakeup)
> +       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)
>  {
> Index: linux-pm/drivers/acpi/sleep.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/sleep.c
> +++ linux-pm/drivers/acpi/sleep.c
> @@ -930,8 +930,6 @@ static int lps0_device_attach(struct acp
>
>                 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
>                                   bitmask);
> -
> -               acpi_ec_mark_gpe_for_wake();
>         } else {
>                 acpi_handle_debug(adev->handle,
>                                   "_DSM function 0 evaluation failed\n");
> @@ -960,8 +958,6 @@ static int acpi_s2idle_prepare(void)
>         if (lps0_device_handle) {
>                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
>                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
> -
> -               acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
>         }
>
>         if (acpi_sci_irq_valid())
> @@ -979,10 +975,7 @@ static int acpi_s2idle_prepare(void)
>
>  static void acpi_s2idle_wake(void)
>  {
> -       if (!lps0_device_handle)
> -               return;
> -
> -       if (pm_debug_messages_on)
> +       if (lps0_device_handle && pm_debug_messages_on)
>                 lpi_check_constraints();
>
>         /*
> @@ -1031,8 +1024,6 @@ static void acpi_s2idle_restore(void)
>                 disable_irq_wake(acpi_sci_irq);
>
>         if (lps0_device_handle) {
> -               acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
> -
>                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
>                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
>         }
>
>
>


-- 
With Best Regards,
Andy Shevchenko

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