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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 08bc4f42-f8ab-45c7-7ab0-08d67557f122 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jan 2019 10:56:29.0176 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3f4057f3-b418-4d4e-ba84-d55b4e897d88 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR11MB1399 X-OriginatorOrg: microchip.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Claudiu Beznea Add support to check if platform's power will be cut off in suspend. This will help drivers shared by multiple platforms to take only the necessary actions while suspending/resuming (some platform may not need to save/restore all the registers if platforms remains powered while suspended). In this way suspend/resume time could be improved. Signed-off-by: Claudiu Beznea --- include/linux/suspend.h | 6 ++++++ kernel/power/suspend.c | 13 +++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 3f529ad9a9d2..21f19b167fe2 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -173,6 +173,9 @@ static inline void dpm_save_failed_step(enum suspend_st= at_step step) * Called by the PM core if the suspending of devices fails. * This callback is optional and should only be implemented by platforms * which require special recovery actions in that situation. + * + * @off_in_suspend: Returns wether the platform's power will be cut off at + * the end of suspend procedure or not. */ struct platform_suspend_ops { int (*valid)(suspend_state_t state); @@ -185,6 +188,7 @@ struct platform_suspend_ops { bool (*suspend_again)(void); void (*end)(void); void (*recover)(void); + bool (*off_in_suspend)(suspend_state_t state); }; =20 struct platform_s2idle_ops { @@ -275,6 +279,7 @@ extern void arch_suspend_disable_irqs(void); extern void arch_suspend_enable_irqs(void); =20 extern int pm_suspend(suspend_state_t state); +extern bool platform_off_in_suspend(suspend_state_t state); #else /* !CONFIG_SUSPEND */ #define suspend_valid_only_mem NULL =20 @@ -287,6 +292,7 @@ static inline bool pm_suspend_via_s2idle(void) { return= false; } =20 static inline void suspend_set_ops(const struct platform_suspend_ops *ops)= {} static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; } +static inline bool platform_off_in_suspend(suspend_state_t state) { return= false; } static inline bool idle_should_enter_s2idle(void) { return false; } static inline void __init pm_states_init(void) {} static inline void s2idle_set_ops(const struct platform_s2idle_ops *ops) {= } diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 0bd595a0b610..e1f60c8a17b9 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -319,6 +319,19 @@ static bool platform_suspend_again(suspend_state_t sta= te) suspend_ops->suspend_again() : false; } =20 +/** + * platform_off_in_suspend() - specifies if SoC's power will pe cut off at= the + * end of suspend procedure. + */ +bool platform_off_in_suspend(suspend_state_t state) +{ + if (!suspend_ops || !suspend_ops->off_in_suspend) + return false; + + return suspend_ops->off_in_suspend(state); +} +EXPORT_SYMBOL_GPL(platform_off_in_suspend); + #ifdef CONFIG_PM_DEBUG static unsigned int pm_test_delay =3D 5; module_param(pm_test_delay, uint, 0644); --=20 2.7.4