The flow controller would take care the power sequence when CPU idle in powered-down mode. It powered gate the CPU when CPU runs into WFI instruction. And wake up the CPU when event be triggered. The sequence is below. * setting wfi bitmap for the CPU as the halt event in the FLOW_CTRL_CPU_HALT_REG to monitor the CPU running into WFI,then power gate it * setting IRQ and FIQ as wake up event to wake up CPU when event triggered Signed-off-by: Joseph Lo <josephl@xxxxxxxxxx> --- V4: * no change V3: * no change V2: * no change --- arch/arm/mach-tegra/flowctrl.h | 2 ++ arch/arm/mach-tegra/sleep-tegra30.S | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/arm/mach-tegra/flowctrl.h b/arch/arm/mach-tegra/flowctrl.h index 7a29bae..e56a950 100644 --- a/arch/arm/mach-tegra/flowctrl.h +++ b/arch/arm/mach-tegra/flowctrl.h @@ -28,6 +28,8 @@ #define FLOW_CTRL_SCLK_RESUME (1 << 27) #define FLOW_CTRL_HALT_CPU_IRQ (1 << 10) #define FLOW_CTRL_HALT_CPU_FIQ (1 << 8) +#define FLOW_CTRL_HALT_GIC_IRQ (1 << 9) +#define FLOW_CTRL_HALT_GIC_FIQ (1 << 8) #define FLOW_CTRL_CPU0_CSR 0x8 #define FLOW_CTRL_CSR_INTR_FLAG (1 << 15) #define FLOW_CTRL_CSR_EVENT_FLAG (1 << 14) diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S index ada8821..5877f26 100644 --- a/arch/arm/mach-tegra/sleep-tegra30.S +++ b/arch/arm/mach-tegra/sleep-tegra30.S @@ -99,6 +99,8 @@ flow_ctrl_setting_for_lp2: cmp r10, #TEGRA30 moveq r3, #FLOW_CTRL_WAIT_FOR_INTERRUPT @ For LP2 movne r3, #FLOW_CTRL_WAITEVENT + orrne r3, r3, #FLOW_CTRL_HALT_GIC_IRQ + orrne r3, r3, #FLOW_CTRL_HALT_GIC_FIQ flow_ctrl_done: cmp r10, #TEGRA30 str r3, [r2] -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
