研發干貨丨關于RK3399 開發板休眠、關機功能簡析
原創
2021-01-15 11:09:00
RK3399
文章目錄
Power按鍵
~短按休眠和長按關機
關機命令
~poweroff命令關機
OK3399-C平臺采用RK3399 主CPU芯片設計，支持底板Power按鍵休眠喚醒以及關機功能，Linux命令行也可以通過命令進行關機，下面對這兩種方式進行簡單的解析。
Power按鍵
Power按鍵的休眠喚醒功能一般是與PMIC芯片和CPU相關的，硬件上該按鍵會連接到PMIC的PWRON引腳和CPU對應的引腳上。
先來看power按鍵在PMIC側的響應機制，POWER鍵按下以后，經過TdbPWRONF時間以后，INT引腳變為低電平，觸發中斷。內核驅動響應中斷，執行休眠程序。
如果PWRON繼續保持低電平超過TdPWRONLP，PMIC就會響應，RK3399板卡將進行關機。
短按休眠和長按關機
Log信息：
[ 10.250531] PM: Syncing filesystems ... done. [ 10.255148] test message. //加入的測試信息 [ 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
涉及驅動文件
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;
}
通過代碼可知，Power按鍵觸發的休眠和關機會執行sys_sync函數，進行系統數據的保存，這與突然掉電導致的異常關機是有很大區別的。
關機命令
RK3399 平臺Linux下的關機命令有shutdown、halt、poweroff命令等.
Poweroff命令關機
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 //加入的測試信息
[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命令做的事可以從打印信息上看出來，其實可以分為兩部分，一是配置系統，停止當前的服務，進行數據保存。二是調用電源管理驅動對應的接口，完成電源配置，RK3399 主板進行關機。
涉及驅動文件
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;
}
最終調用的的rk808shutdown接口函數，對RK808DEVCTRLREG寄存器寫入DEVOFF_RST，觸發RK3399主板關機。
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