研发干货丨关于RK3399 开发板休眠、关机功能简析
原创
2021-01-15 11:09:00
RK3399
文章目录
Power按键
~短按休眠和长按关机
关机命令
~poweroff命令关机
OK3399-C平台采用RK3399 主CPU芯片设计，支持底板Power按键休眠唤醒以及关机功能，Linux命令行也可以通过命令进行关机，下面对这两种方式进行简单的解析。
Power按键
Power按键的休眠唤醒功能一般是与PMIC芯片和CPU相关的，硬件上该按键会连接到PMIC的PWRON引脚和CPU对应的引脚上。
先来看power按键在PMIC侧的响应机制，POWER键按下以后，经过TdbPWRONF时间以后，INT引脚变为低电平，触发中断。内核驱动响应中断，执行休眠程序。
如果PWRON继续保持低电平超过TdPWRONLP，PMIC就会响应，RK3399板卡将进行关机。
短按休眠和长按关机
Log信息：
[ 10.250531] PM: Syncing filesystems ... done. [ 10.255148] test message. //加入的测试信息 [ 10.256842] Freezing user space processes ... (elapsed 0.003 seconds) done. [ 10.260770] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done. [ 10.263308] Suspending console(s) (use no_console_suspend to debug) INFO: sleep mode config[0xde]: INFO: AP_PWROFF INFO: SLP_ARMPD INFO: SLP_PLLPD INFO: DDR_RET INFO: SLP_CENTER_PD INFO: wakeup source config[0x804]: INFO: GPIO interrupt can wakeup system INFO: PWM interrupt can wakeup system INFO: PWM CONFIG[0x4]: INFO: PWM: PWM2D_REGULATOR_EN INFO: APIOS info[0x0]: INFO: not config INFO: GPIO POWER INFO: INFO: GPIO1_C1 INFO: GPIO1_B6 INFO: PMU_MODE_CONG: 0x1477bf51
涉及驱动文件
kernel/kernel/power/suspend.c
/**
* enter_state - Do common work needed to enter system sleep state.
* @state: System sleep state to enter.
*
* Make sure that no one else is trying to put the system into a sleep state.
* Fail if that's not the case. Otherwise, prepare for system suspend, make the
* system enter the given sleep state and clean up after wakeup.
*/
static int enter_state(suspend_state_t state)
{
int error;
trace_suspend_resume(TPS("suspend_enter"), state, true);
if (state == PM_SUSPEND_FREEZE) {
#ifdef CONFIG_PM_DEBUG
if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) {
pr_warning("PM: Unsupported test mode for suspend to idle,"
"please choose none/freezer/devices/platform.\n");
return -EAGAIN;
}
#endif
} else if (!valid_state(state)) {
return -EINVAL;
}
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
if (state == PM_SUSPEND_FREEZE)
freeze_begin();
#ifndef CONFIG_SUSPEND_SKIP_SYNC
trace_suspend_resume(TPS("sync_filesystems"), 0, true);
printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
trace_suspend_resume(TPS("sync_filesystems"), 0, false);
#endif
pr_debug("PM: Preparing system for sleep (%s)\n", pm_states[state]);
pm_suspend_clear_flags();
error = suspend_prepare(state);
if (error)
goto Unlock;
if (suspend_test(TEST_FREEZER))
goto Finish;
trace_suspend_resume(TPS("suspend_enter"), state, false);
pr_debug("PM: Suspending system (%s)\n", pm_states[state]);
pm_restrict_gfp_mask();
error = suspend_devices_and_enter(state);
pm_restore_gfp_mask();
Finish:
pr_debug("PM: Finishing wakeup.\n");
suspend_finish();
Unlock:
mutex_unlock(&pm_mutex);
return error;
}
通过代码可知，Power按键触发的休眠和关机会执行sys_sync函数，进行系统数据的保存，这与突然掉电导致的异常关机是有很大区别的。
关机命令
RK3399 平台Linux下的关机命令有shutdown、halt、poweroff命令等.
Poweroff命令关机
Log信息：
[root@rk3399:/]# poweroff [root@rk3399:/]# stop finishedStopping input-event-daemon: done stop auto-reboot finished Stopping dnsmasq: OK Stopping vsftpd: stopped vsftpd (pid 1072) OK [ 20.099392] [BT_RFKILL]: bt shut off power [ 20.132245] configfs-gadget gadget: unbind function 'Function FS Gadget'/ffffffc07b025a38 Stopping sshd: OK Stopping lighttpd: OK Gracefully shutting down php-fpm . done Stopping dhcpcd... stopped /sbin/dhcpcd (pid 924) killall: rkisp_3A_server: no process killed Stopping network: OK stop finishedStopping system message bus: done Saving random seed... done. Stopping logging: OK umount: can't remount adb read-only umount: devtmpfs busy - remounted read-only [ 21.589884] EXT4-fs (mmcblk2p8): re-mounted. Opts: (null) The system is going down NOW! Sent SIGTERM to all processes Sent SIGKILL to all processes Requesting system poweroff [ 23.597578] cpu cpu4: min=816000, max=816000 [ 23.598572] cpu cpu0: min=816000, max=816000 [ 23.669985] I : [File] : drivers/gpu/arm/midgard_for_linux/platform/rk/mali_kbase_config_rk.c; [Line] : 274; [Func] : kbase_platform_rk_shutdown(); to make vdd_gpu enabled for turning off pd_gpu in pm_framework. [ 23.671701] rk-vcodec ff660000.rkvdec: shutdown [ 23.672132] rk-vcodec ff650000.vpu_service: shutdown [ 23.673046] rk808 0-001b: System power off [ 23.673419] rk808 0-001b: test message //加入的测试信息
[root@rk3399:/]# poweroff --help
BusyBox v1.27.2 (2020-03-19 09:39:13 UTC) multi-call binary.
Usage: poweroff [-d DELAY] [-n] [-f]
Halt and shut off power
-d SEC Delay interval
-n Do not sync
-f Force (don't go through init)
Poweroff命令做的事可以从打印信息上看出来，其实可以分为两部分，一是配置系统，停止当前的服务，进行数据保存。二是调用电源管理驱动对应的接口，完成电源配置，RK3399 主板进行关机。
涉及驱动文件
kernel/drivers/mfd/rk808.c
static void rk808_syscore_shutdown(void)
{
int ret;
struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
if (!rk808) {
dev_warn(&rk808_i2c_client->dev,
"have no rk808, so do nothing here\n");
return;
}
/* close rtc int when power off */
regmap_update_bits(rk808->regmap,
RK808_INT_STS_MSK_REG1,
(0x3 << 5), (0x3 << 5));
regmap_update_bits(rk808->regmap,
RK808_RTC_INT_REG,
(0x3 << 2), (0x0 << 2));
/*
* For PMIC that power off supplies by write register via i2c bus,
* it's better to do power off at syscore shutdown here.
*
* Because when run to kernel's "pm_power_off" call, i2c may has
* been stopped or PMIC may not be able to get i2c transfer while
* there are too many devices are competiting.
*/
if (system_state == SYSTEM_POWER_OFF) {
/* power off supplies ! */
if (pm_shutdown) {
dev_info(&rk808_i2c_client->dev, "System power off\n");
ret = pm_shutdown(rk808->regmap);
if (ret)
dev_err(&rk808_i2c_client->dev,
"System power off error!\n");
mdelay(10);
dev_info(&rk808_i2c_client->dev,
"Cpu should never reach here, stop!\n");
while (1)
;
}
}
}
#define DEV_OFF_RST BIT(3)
static int rk808_shutdown(struct regmap *regmap)
{
int ret;
ret = regmap_update_bits(regmap,
RK808_DEVCTRL_REG,
DEV_OFF_RST, DEV_OFF_RST);
return ret;
}
最终调用的的rk808shutdown接口函数，对RK808DEVCTRLREG寄存器写入DEVOFF_RST，触发RK3399主板关机。
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