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cpuidle: qcom-spm: Check if any CPU is managed by SPM
[ Upstream commit0ee30ace67
] At the moment, the "qcom-spm-cpuidle" platform device is always created, even if none of the CPUs is actually managed by the SPM. On non-qcom platforms this will result in infinite probe-deferral due to the failing qcom_scm_is_available() call. To avoid this, look through the CPU DT nodes and check if there is actually any CPU managed by a SPM (as indicated by the qcom,saw property). It should also be available because e.g. MSM8916 has qcom,saw defined but it's typically not enabled with ARM64/PSCI firmwares. This is needed in preparation of a follow-up change that calls qcom_scm_set_warm_boot_addr() a single time before registering any cpuidle drivers. Otherwise this call might be made even on devices that have this driver enabled but actually make use of PSCI. Fixes:60f3692b5f
("cpuidle: qcom_spm: Detach state machine from main SPM handling") Reported-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/86e3e09f-a8d7-3dff-3fc6-ddd7d30c5d78@samsung.com/ Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20211201130505.257379-2-stephan@gerhold.net Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 20 additions and 0 deletions
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@ -155,6 +155,22 @@ static struct platform_driver spm_cpuidle_driver = {
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},
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};
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static bool __init qcom_spm_find_any_cpu(void)
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{
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struct device_node *cpu_node, *saw_node;
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for_each_of_cpu_node(cpu_node) {
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saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
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if (of_device_is_available(saw_node)) {
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of_node_put(saw_node);
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of_node_put(cpu_node);
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return true;
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}
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of_node_put(saw_node);
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}
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return false;
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}
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static int __init qcom_spm_cpuidle_init(void)
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{
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struct platform_device *pdev;
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@ -164,6 +180,10 @@ static int __init qcom_spm_cpuidle_init(void)
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if (ret)
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return ret;
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/* Make sure there is actually any CPU managed by the SPM */
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if (!qcom_spm_find_any_cpu())
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return 0;
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pdev = platform_device_register_simple("qcom-spm-cpuidle",
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-1, NULL, 0);
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if (IS_ERR(pdev)) {
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