运行LINUX系统,使能A7核心进入低功耗,使用echo mem >/sys/power/state命令,显示 PM: suspend entry (deep) Filesystems sync: 0.023 seconds Freezing user space processes ... (elapsed 0.002 seconds) done. OOM killer disabled. Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done. printk: Suspending console(s) (use no_console_suspend to debug) PM: dpm_run_callback(): platform_pm_suspend+0x0/0x48 returns -16 PM: Device 40017000.dac:dac@1 failed to suspend: error -16 PM: Some devices failed to suspend, or early wake event detected OOM killer enabled. Restarting tasks ... done. PM: suspend exit sh: write error: Device or resource busy 提示DAC没有进入syspend,导致休眠失败。 查看休眠结果cat /sys/kernel/debug/suspend_stats success: 0 fail: 16 failed_freeze: 0 failed_prepare: 0 failed_suspend: 16 failed_suspend_late: 0 failed_suspend_noirq: 0 failed_resume: 0 failed_resume_early: 0 failed_resume_noirq: 0、 failures: last_failed_dev: 40017000.dac:dac@1 40017000.dac:dac@1 last_failed_errno: -16 -16 last_failed_step: suspend suspend DAC驱动使用的是ST原生驱动,想问一下如何解决,这块问题导致现在系统无法休眠 |
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