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SubjectRe: [PATCH] cpufreq: qcom-hw: Don't do lmh things without a throttle interrupt
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On 6/17/22 01:45, Stephen Boyd wrote:
> 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>
> ---
> 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);
> }
>
>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>

--
Best wishes,
Vladimir

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