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cpuidle: qcom-spm: Check if any CPU is managed by SPM 

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
This commit is contained in:
Stephan Gerhold 2021-12-01 14:05:02 +01:00 committed by Bjorn Andersson
parent 5cef9b4845
commit 0ee30ace67
1 changed files with 20 additions and 0 deletions
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20
drivers/cpuidle/cpuidle-qcom-spm.c
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@ -155,6 +155,22 @@ static struct platform_driver spm_cpuidle_driver = {
},
};
static bool __init qcom_spm_find_any_cpu(void)
{
struct device_node *cpu_node, *saw_node;
for_each_of_cpu_node(cpu_node) {
saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
if (of_device_is_available(saw_node)) {
of_node_put(saw_node);
of_node_put(cpu_node);
return true;
}
of_node_put(saw_node);
}
return false;
}
static int __init qcom_spm_cpuidle_init(void)
{
struct platform_device *pdev;
@ -164,6 +180,10 @@ static int __init qcom_spm_cpuidle_init(void)
if (ret)
return ret;
/* Make sure there is actually any CPU managed by the SPM */
if (!qcom_spm_find_any_cpu())
return 0;
pdev = platform_device_register_simple("qcom-spm-cpuidle",
-1, NULL, 0);
if (IS_ERR(pdev)) {