• Viresh Kumar's avatar
    cpufreq: longhaul: Revert transition_delay_us to 200 ms · 1d0d0643
    Viresh Kumar authored
    The commit e948bc8f ("cpufreq: Cap the default transition delay
    value to 10 ms") caused a regression on EPIA-M min-ITX computer where
    shutdown or reboot hangs occasionally with a print message like:
    
    longhaul: Warning: Timeout while waiting for idle PCI bus
    cpufreq: __target_index: Failed to change cpu frequency: -16
    
    This probably happens because the cpufreq governor tries to change the
    frequency of the CPU faster than allowed by the hardware.
    
    Before the above commit, the default transition delay was set to 200 ms
    for a transition_latency of 200000 ns. Lets revert back to that
    transition delay value to fix it. Note that several other transition
    delay values were tested like 20 ms and 30 ms and none of them have
    resolved system hang issue completely.
    
    Fixes: e948bc8f (cpufreq: Cap the default transition delay value to 10 ms)
    Reported-by: default avatarMeelis Roos <mroos@linux.ee>
    Suggested-by: default avatarRafael J. Wysocki <rjw@rjwysocki.net>
    Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    1d0d0643
longhaul.c 25.3 KB