From: Stephen Boyd swboyd@chromium.org
commit 668a7a12ded7077d4fd7ad1305667e559907e5bb upstream.
Offlining cpu6 and cpu7 and then onlining cpu6 hangs on sc7180-trogdor-lazor because the throttle interrupt doesn't exist. Similarly, things go sideways when suspend/resume runs. That's because the qcom_cpufreq_hw_cpu_online() and qcom_cpufreq_hw_lmh_exit() functions are calling genirq APIs with an interrupt value of '-6', i.e. -ENXIO, and that isn't good.
Check the value of the throttle interrupt like we already do in other functions in this file and bail out early from lmh code to fix the hang.
Reported-by: Rob Clark robdclark@chromium.org Cc: Vladimir Zapolskiy vladimir.zapolskiy@linaro.org Cc: Bjorn Andersson bjorn.andersson@linaro.org Cc: Dmitry Baryshkov dmitry.baryshkov@linaro.org Fixes: a1eb080a0447 ("cpufreq: qcom-hw: provide online/offline operations") Signed-off-by: Stephen Boyd swboyd@chromium.org Reviewed-by: Vladimir Zapolskiy vladimir.zapolskiy@linaro.org Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/cpufreq/qcom-cpufreq-hw.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c index 0253731d6d25..36c79580fba2 100644 --- a/drivers/cpufreq/qcom-cpufreq-hw.c +++ b/drivers/cpufreq/qcom-cpufreq-hw.c @@ -442,6 +442,9 @@ static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy) struct platform_device *pdev = cpufreq_get_driver_data(); int ret;
+ if (data->throttle_irq <= 0) + return 0; + ret = irq_set_affinity_hint(data->throttle_irq, policy->cpus); if (ret) dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n", @@ -469,6 +472,9 @@ static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy)
static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data) { + if (data->throttle_irq <= 0) + return; + free_irq(data->throttle_irq, data); }