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Date: Mon, 16 Oct 2017 10:01:54 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Linux ACPI <linux-acpi@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Linux PM <linux-pm@...r.kernel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH v2] ACPI / PM: Combine device suspend routines
On 14 October 2017 at 17:43, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> On top of a previous change getting rid of the PM QoS flag
> PM_QOS_FLAG_REMOTE_WAKEUP, combine two ACPI device suspend routines,
> acpi_dev_runtime_suspend() and acpi_dev_suspend_late(), into one,
> acpi_dev_suspend(), to eliminate some code duplication.
>
> It also avoids enabling wakeup for devices handled by the ACPI
> LPSS middle layer on driver removal.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Nice work and cleanup!
Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
>
> -> v2: Drop a previously missed acpi_dev_runtime_suspend() header.
>
> ---
> drivers/acpi/acpi_lpss.c | 6 ++--
> drivers/acpi/device_pm.c | 61 ++++++++++-------------------------------------
> include/linux/acpi.h | 3 --
> 3 files changed, 18 insertions(+), 52 deletions(-)
>
> Index: linux-pm/drivers/acpi/device_pm.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/device_pm.c
> +++ linux-pm/drivers/acpi/device_pm.c
> @@ -847,37 +847,39 @@ static int acpi_dev_pm_full_power(struct
> }
>
> /**
> - * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
> + * acpi_dev_suspend - Put device into a low-power state using ACPI.
> * @dev: Device to put into a low-power state.
> + * @wakeup: Whether or not to enable wakeup for the device.
> *
> - * Put the given device into a runtime low-power state using the standard ACPI
> + * Put the given device into a low-power state using the standard ACPI
> * mechanism. Set up remote wakeup if desired, choose the state to put the
> * device into (this checks if remote wakeup is expected to work too), and set
> * the power state of the device.
> */
> -int acpi_dev_runtime_suspend(struct device *dev)
> +int acpi_dev_suspend(struct device *dev, bool wakeup)
> {
> struct acpi_device *adev = ACPI_COMPANION(dev);
> - bool remote_wakeup;
> + u32 target_state = acpi_target_system_state();
> int error;
>
> if (!adev)
> return 0;
>
> - remote_wakeup = acpi_device_can_wakeup(adev);
> - if (remote_wakeup) {
> - error = acpi_device_wakeup_enable(adev, ACPI_STATE_S0);
> + if (wakeup && acpi_device_can_wakeup(adev)) {
> + error = acpi_device_wakeup_enable(adev, target_state);
> if (error)
> return -EAGAIN;
> + } else {
> + wakeup = false;
> }
>
> - error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
> - if (error && remote_wakeup)
> + error = acpi_dev_pm_low_power(dev, adev, target_state);
> + if (error && wakeup)
> acpi_device_wakeup_disable(adev);
>
> return error;
> }
> -EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend);
> +EXPORT_SYMBOL_GPL(acpi_dev_suspend);
>
> /**
> * acpi_dev_resume - Put device into the full-power state using ACPI.
> @@ -910,7 +912,7 @@ EXPORT_SYMBOL_GPL(acpi_dev_resume);
> int acpi_subsys_runtime_suspend(struct device *dev)
> {
> int ret = pm_generic_runtime_suspend(dev);
> - return ret ? ret : acpi_dev_runtime_suspend(dev);
> + return ret ? ret : acpi_dev_suspend(dev, true);
> }
> EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);
>
> @@ -929,41 +931,6 @@ int acpi_subsys_runtime_resume(struct de
> EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
>
> #ifdef CONFIG_PM_SLEEP
> -/**
> - * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
> - * @dev: Device to put into a low-power state.
> - *
> - * Put the given device into a low-power state during system transition to a
> - * sleep state using the standard ACPI mechanism. Set up system wakeup if
> - * desired, choose the state to put the device into (this checks if system
> - * wakeup is expected to work too), and set the power state of the device.
> - */
> -int acpi_dev_suspend_late(struct device *dev)
> -{
> - struct acpi_device *adev = ACPI_COMPANION(dev);
> - u32 target_state;
> - bool wakeup;
> - int error;
> -
> - if (!adev)
> - return 0;
> -
> - target_state = acpi_target_system_state();
> - wakeup = device_may_wakeup(dev) && acpi_device_can_wakeup(adev);
> - if (wakeup) {
> - error = acpi_device_wakeup_enable(adev, target_state);
> - if (error)
> - return error;
> - }
> -
> - error = acpi_dev_pm_low_power(dev, adev, target_state);
> - if (error && wakeup)
> - acpi_device_wakeup_disable(adev);
> -
> - return error;
> -}
> -EXPORT_SYMBOL_GPL(acpi_dev_suspend_late);
> -
> static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev)
> {
> u32 sys_target = acpi_target_system_state();
> @@ -1046,7 +1013,7 @@ EXPORT_SYMBOL_GPL(acpi_subsys_suspend);
> int acpi_subsys_suspend_late(struct device *dev)
> {
> int ret = pm_generic_suspend_late(dev);
> - return ret ? ret : acpi_dev_suspend_late(dev);
> + return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev));
> }
> EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
>
> Index: linux-pm/drivers/acpi/acpi_lpss.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/acpi_lpss.c
> +++ linux-pm/drivers/acpi/acpi_lpss.c
> @@ -713,7 +713,7 @@ static int acpi_lpss_activate(struct dev
>
> static void acpi_lpss_dismiss(struct device *dev)
> {
> - acpi_dev_runtime_suspend(dev);
> + acpi_dev_suspend(dev, false);
> }
>
> #ifdef CONFIG_PM_SLEEP
> @@ -729,7 +729,7 @@ static int acpi_lpss_suspend_late(struct
> if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
> acpi_lpss_save_ctx(dev, pdata);
>
> - return acpi_dev_suspend_late(dev);
> + return acpi_dev_suspend(dev, device_may_wakeup(dev));
> }
>
> static int acpi_lpss_resume_early(struct device *dev)
> @@ -847,7 +847,7 @@ static int acpi_lpss_runtime_suspend(str
> if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
> acpi_lpss_save_ctx(dev, pdata);
>
> - ret = acpi_dev_runtime_suspend(dev);
> + ret = acpi_dev_suspend(dev, true);
>
> /*
> * This call must be last in the sequence, otherwise PMC will return
> Index: linux-pm/include/linux/acpi.h
> ===================================================================
> --- linux-pm.orig/include/linux/acpi.h
> +++ linux-pm/include/linux/acpi.h
> @@ -864,7 +864,7 @@ static inline void arch_reserve_mem_area
> #endif
>
> #if defined(CONFIG_ACPI) && defined(CONFIG_PM)
> -int acpi_dev_runtime_suspend(struct device *dev);
> +int acpi_dev_suspend(struct device *dev, bool wakeup);
> int acpi_dev_resume(struct device *dev);
> int acpi_subsys_runtime_suspend(struct device *dev);
> int acpi_subsys_runtime_resume(struct device *dev);
> @@ -889,7 +889,6 @@ int acpi_subsys_resume_early(struct devi
> int acpi_subsys_suspend(struct device *dev);
> int acpi_subsys_freeze(struct device *dev);
> #else
> -static inline int acpi_dev_suspend_late(struct device *dev) { return 0; }
> static inline int acpi_dev_resume_early(struct device *dev) { return 0; }
> static inline int acpi_subsys_prepare(struct device *dev) { return 0; }
> static inline void acpi_subsys_complete(struct device *dev) {}
>
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