diff options
| author | Anson Huang <b20788@freescale.com> | 2014-06-23 16:42:44 +0800 |
|---|---|---|
| committer | Shawn Guo <shawn.guo@freescale.com> | 2014-07-18 16:11:30 +0800 |
| commit | 80c0ecdce802bd642dc7127cc77cea04e0a71bf5 (patch) | |
| tree | d132b17db6e55bbf0539aa78ce137bbc44890273 | |
| parent | dfea953ae221111c14d2fcfebad7b1973a0f49bd (diff) | |
| download | op-kernel-dev-80c0ecdce802bd642dc7127cc77cea04e0a71bf5.zip op-kernel-dev-80c0ecdce802bd642dc7127cc77cea04e0a71bf5.tar.gz | |
ARM: imx: add standby mode support for suspend
Add standby mode support for suspend, to enter standby mode:
echo standby > /sys/power/state;
Use UART or RTC alarm to wake up system, when system enters
standby mode, SOC will enter STOP mode with ARM core kept
power on and 24M XTAL on.
Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
| -rw-r--r-- | arch/arm/mach-imx/common.h | 2 | ||||
| -rw-r--r-- | arch/arm/mach-imx/gpc.c | 5 | ||||
| -rw-r--r-- | arch/arm/mach-imx/pm-imx6.c | 30 |
3 files changed, 32 insertions, 5 deletions
diff --git a/arch/arm/mach-imx/common.h b/arch/arm/mach-imx/common.h index 13a6e1f..d205f36 100644 --- a/arch/arm/mach-imx/common.h +++ b/arch/arm/mach-imx/common.h @@ -106,7 +106,7 @@ static inline void imx_scu_standby_enable(void) {} #endif void imx_src_init(void); void imx_gpc_init(void); -void imx_gpc_pre_suspend(void); +void imx_gpc_pre_suspend(bool arm_power_off); void imx_gpc_post_resume(void); void imx_gpc_mask_all(void); void imx_gpc_restore_all(void); diff --git a/arch/arm/mach-imx/gpc.c b/arch/arm/mach-imx/gpc.c index 586e017..82ea74e 100644 --- a/arch/arm/mach-imx/gpc.c +++ b/arch/arm/mach-imx/gpc.c @@ -27,13 +27,14 @@ static void __iomem *gpc_base; static u32 gpc_wake_irqs[IMR_NUM]; static u32 gpc_saved_imrs[IMR_NUM]; -void imx_gpc_pre_suspend(void) +void imx_gpc_pre_suspend(bool arm_power_off) { void __iomem *reg_imr1 = gpc_base + GPC_IMR1; int i; /* Tell GPC to power off ARM core when suspend */ - writel_relaxed(0x1, gpc_base + GPC_PGC_CPU_PDN); + if (arm_power_off) + writel_relaxed(0x1, gpc_base + GPC_PGC_CPU_PDN); for (i = 0; i < IMR_NUM; i++) { gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4); diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c index b3c770d..5c3af8f 100644 --- a/arch/arm/mach-imx/pm-imx6.c +++ b/arch/arm/mach-imx/pm-imx6.c @@ -274,6 +274,14 @@ int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode) break; case STOP_POWER_ON: val |= 0x2 << BP_CLPCR_LPM; + val &= ~BM_CLPCR_VSTBY; + val &= ~BM_CLPCR_SBYOS; + if (cpu_is_imx6sl()) + val |= BM_CLPCR_BYPASS_PMIC_READY; + if (cpu_is_imx6sl() || cpu_is_imx6sx()) + val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS; + else + val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS; break; case WAIT_UNCLOCKED_POWER_OFF: val |= 0x1 << BP_CLPCR_LPM; @@ -334,6 +342,19 @@ static int imx6q_suspend_finish(unsigned long val) static int imx6q_pm_enter(suspend_state_t state) { switch (state) { + case PM_SUSPEND_STANDBY: + imx6q_set_lpm(STOP_POWER_ON); + imx6q_set_int_mem_clk_lpm(true); + imx_gpc_pre_suspend(false); + if (cpu_is_imx6sl()) + imx6sl_set_wait_clk(true); + /* Zzz ... */ + cpu_do_idle(); + if (cpu_is_imx6sl()) + imx6sl_set_wait_clk(false); + imx_gpc_post_resume(); + imx6q_set_lpm(WAIT_CLOCKED); + break; case PM_SUSPEND_MEM: imx6q_set_lpm(STOP_POWER_OFF); imx6q_set_int_mem_clk_lpm(false); @@ -344,7 +365,7 @@ static int imx6q_pm_enter(suspend_state_t state) */ if (!imx6_suspend_in_ocram_fn) imx6q_enable_rbc(true); - imx_gpc_pre_suspend(); + imx_gpc_pre_suspend(true); imx_anatop_pre_suspend(); imx_set_cpu_jump(0, v7_cpu_resume); /* Zzz ... */ @@ -365,9 +386,14 @@ static int imx6q_pm_enter(suspend_state_t state) return 0; } +static int imx6q_pm_valid(suspend_state_t state) +{ + return (state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM); +} + static const struct platform_suspend_ops imx6q_pm_ops = { .enter = imx6q_pm_enter, - .valid = suspend_valid_only_mem, + .valid = imx6q_pm_valid, }; void __init imx6q_pm_set_ccm_base(void __iomem *base) |
