From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bastian Hecht Date: Wed, 05 Dec 2012 12:13:07 +0000 Subject: [PATCH 2/2] ARM: shmobile: r8a7740: Add CPU sleep suspend Message-Id: <1354709587-25288-2-git-send-email-hechtb+renesas@gmail.com> List-Id: References: <1354709587-25288-1-git-send-email-hechtb+renesas@gmail.com> In-Reply-To: <1354709587-25288-1-git-send-email-hechtb+renesas@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org From: Bastian Hecht Add the lighest possible sleep mode on Cortex-A9 cores: CPU sleep. It is entered by a simple dsb and wfi instruction via cpu_do_idle(). As just clocks are stopped there is no need to save or restore any state of the system. Signed-off-by: Bastian Hecht --- arch/arm/mach-shmobile/board-armadillo800eva.c | 2 ++ arch/arm/mach-shmobile/include/mach/common.h | 1 + arch/arm/mach-shmobile/pm-r8a7740.c | 20 ++++++++++++++++++++ 3 files changed, 23 insertions(+) diff --git a/arch/arm/mach-shmobile/board-armadillo800eva.c b/arch/arm/mach-shmobile/board-armadillo800eva.c index 3cc8b1c..48847f6 100644 --- a/arch/arm/mach-shmobile/board-armadillo800eva.c +++ b/arch/arm/mach-shmobile/board-armadillo800eva.c @@ -1213,6 +1213,8 @@ static void __init eva_init(void) rmobile_add_device_to_domain("A4LC", &hdmi_lcdc_device); if (usb) rmobile_add_device_to_domain("A3SP", usb); + + r8a7740_pm_init(); } static void __init eva_earlytimer_init(void) diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h index 318551b3..ebcd28d 100644 --- a/arch/arm/mach-shmobile/include/mach/common.h +++ b/arch/arm/mach-shmobile/include/mach/common.h @@ -66,6 +66,7 @@ extern void r8a7740_add_early_devices(void); extern void r8a7740_add_standard_devices(void); extern void r8a7740_clock_init(u8 md_ck); extern void r8a7740_pinmux_init(void); +extern void r8a7740_pm_init(void); extern void r8a7779_init_irq(void); extern void r8a7779_map_io(void); diff --git a/arch/arm/mach-shmobile/pm-r8a7740.c b/arch/arm/mach-shmobile/pm-r8a7740.c index 21e5316d..8cfb5bc 100644 --- a/arch/arm/mach-shmobile/pm-r8a7740.c +++ b/arch/arm/mach-shmobile/pm-r8a7740.c @@ -58,3 +58,23 @@ void __init r8a7740_init_pm_domains(void) } #endif /* CONFIG_PM */ + +#ifdef CONFIG_SUSPEND +static int r8a7740_enter_suspend(suspend_state_t suspend_state) +{ + cpu_do_idle(); + return 0; +} + +static void r8a7740_suspend_init(void) +{ + shmobile_suspend_ops.enter = r8a7740_enter_suspend; +} +#else +static void r8a7740_suspend_init(void) {} +#endif + +void __init r8a7740_pm_init(void) +{ + r8a7740_suspend_init(); +} -- 1.7.9.5