RK3568 Android12 红外遥控器待机唤醒问题

Platform: RK3568
OS: Android 12
Kernel: v4.19.206
SDK Version：android-12.0-mid-rkr1
Module: suspend

问题

红外遥控器待机后无法唤醒，只能用板载电源键唤醒，但是唤醒后红外遥控不能操作

解决方案

dts中如下配置：

&vdd_logic {regulator-state-mem {regulator-on-in-suspend;};  
};&rockchip_suspend {status = "okay";rockchip,sleep-mode-config = < (0| RKPM_SLP_CENTER_OFF| RKPM_SLP_HW_PLLS_OFF| RKPM_SLP_PMUALIVE_32K| RKPM_SLP_PMIC_LP| RKPM_SLP_32K_PVTM)>;rockchip,wakeup-config = < (0| RKPM_PWM0_WKUP_EN| RKPM_CPU0_WKUP_EN)>;
};

简单分析

用板载电源按键唤醒后，红外遥控操作无效。此时用getevent命令看没有input事件上报，用echo 1 > sys/module/rockchip_pwm_remotectl/parameters/code_print命令看也没有键值打印。怀疑是待机后对应的pwm没有重新上电导致无法工作。
红外遥控待机唤醒功能在box产品中应该是标准功能，但目前我们使用的是非box版本的SDK。参考了box的dtsi，设置&rockchip_suspend 节点属性，但测试发现非但遥控不能唤醒，连板载电源键也不能唤醒了，只能重新上电。
根据rk曾工的指导，要保持休眠时logic不掉电，并修改以下配置，测试待机唤醒功能可用，并且唤醒后红外遥控可以正常工作。

rockchip,sleep-mode-config = <
(0 
| RKPM_SLP_CENTER_OFF 
| RKPM_SLP_HW_PLLS_OFF
)>;rockchip,wakeup-config = <
(0 | RKPM_PWM0_WKUP_EN | RKPM_CPU0_WKUP_EN
)

又经过一些对比验证，发现问题关键是需要设置好&rockchip_suspend节点属性和&vdd_logic节点中的regulator-on-in-suspend使其待机不断电。
相关驱动可见drivers/soc/rockchip/rockchip_pm_config.c

node = of_find_node_by_name(NULL, "rockchip-suspend");if (IS_ERR_OR_NULL(node)) {dev_err(&pdev->dev, "%s dev node err\n",  __func__);return -ENODEV;}   if (of_property_read_u32_array(node,"rockchip,sleep-mode-config",&mode_config, 1)) dev_warn(&pdev->dev, "not set sleep mode config\n");elsesip_smc_set_suspend_mode(SUSPEND_MODE_CONFIG, mode_config, 0); if (of_property_read_u32_array(node,"rockchip,wakeup-config",&wakeup_config, 1)) dev_warn(&pdev->dev, "not set wakeup-config\n");elsesip_smc_set_suspend_mode(WKUP_SOURCE_CONFIG, wakeup_config, 0); if (of_property_read_u32_array(node,"rockchip,pwm-regulator-config",&pwm_regulator_config, 1)) dev_warn(&pdev->dev, "not set pwm-regulator-config\n");
elsesip_smc_set_suspend_mode(PWM_REGULATOR_CONFIG,pwm_regulator_config,0);

其中可以看到从dts中解析到属性值后是通过sip_smc_set_suspend_mode()函数进行设置的。
继续跟下去来到drivers/firmware/rockchip_sip.c

static struct arm_smccc_res __invoke_sip_fn_smc(unsigned long function_id,unsigned long arg0,unsigned long arg1,unsigned long arg2)
{struct arm_smccc_res res;arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);return res;
}……int sip_smc_set_suspend_mode(u32 ctrl, u32 config1, u32 config2)
{struct arm_smccc_res res;res = __invoke_sip_fn_smc(SIP_SUSPEND_MODE, ctrl, config1, config2);return res.a0;
}
EXPORT_SYMBOL_GPL(sip_smc_set_suspend_mode);

这里的arm_smccc_smc定义在 arch/arm64/kernel/smccc-call.S，这是汇编的代码，超出我目前的水平了，还涉及到了ATF（ARM Trusted firmware）的领域。需要再看看参考资料¹²加深理解。

        .macro SMCCC instr.cfi_startproc\instr  #0  ldr     x4, [sp]stp     x0, x1, [x4, #ARM_SMCCC_RES_X0_OFFS]stp     x2, x3, [x4, #ARM_SMCCC_RES_X2_OFFS]ldr     x4, [sp, #8] cbz     x4, 1f /* no quirk structure */ldr     x9, [x4, #ARM_SMCCC_QUIRK_ID_OFFS]cmp     x9, #ARM_SMCCC_QUIRK_QCOM_A6b.ne    1f  str     x6, [x4, ARM_SMCCC_QUIRK_STATE_OFFS]
1:      ret .cfi_endproc.endm/** void arm_smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2,*                unsigned long a3, unsigned long a4, unsigned long a5,*                unsigned long a6, unsigned long a7, struct arm_smccc_res *res,*                struct arm_smccc_quirk *quirk)*/
ENTRY(__arm_smccc_smc)SMCCC   smc 
ENDPROC(__arm_smccc_smc)