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    i2c: omap: Fix PM regression with deferred probe for pm_runtime_reinit · e6244dee
    Tony Lindgren 提交于
    Commit 5de85b9d ("PM / runtime: Re-init runtime PM states at probe
    error and driver unbind") introduced pm_runtime_reinit() that is used
    to reinitialize PM runtime after -EPROBE_DEFER. This allows shutting
    down the device after a failed probe.
    
    However, for drivers using pm_runtime_use_autosuspend() this can cause
    a state where suspend callback is never called after -EPROBE_DEFER.
    On the following device driver probe, hardware state is different from
    the PM runtime state causing omap_device to produce the following
    error:
    
    omap_device_enable() called from invalid state 1
    
    And with omap_device and omap hardware being picky for PM, this will
    block any deeper idle states in hardware.
    
    The solution is to fix the drivers to follow the PM runtime documentation:
    
    1. For sections of code that needs the device disabled, use
       pm_runtime_put_sync_suspend() if pm_runtime_set_autosuspend() has
       been set.
    
    2. For driver exit code, use pm_runtime_dont_use_autosuspend() before
       pm_runtime_put_sync() if pm_runtime_use_autosuspend() has been
       set.
    
    Fixes: 5de85b9d ("PM / runtime: Re-init runtime PM states at probe
    error and driver unbind")
    Signed-off-by: NTony Lindgren <tony@atomide.com>
    Acked-by: NUlf Hansson <ulf.hansson@linaro.org>
    Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
    e6244dee
i2c-omap.c 40.8 KB