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cpuidle: tegra: Check whether PMC is ready

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Check whether PMC is ready before proceeding with the cpuidle registration.
This fixes racing with the PMC driver probe order, which results in a
disabled deepest CC6 idling state if cpuidle driver is probed before the
PMC.

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2021-09-12 23:29:07 +03:00 committed by Thierry Reding
parent faae6c9f2e
commit bdb1ffdad3
1 changed files with 3 additions and 0 deletions
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3
drivers/cpuidle/cpuidle-tegra.c
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@ -337,6 +337,9 @@ static void tegra_cpuidle_setup_tegra114_c7_state(void)
static int tegra_cpuidle_probe(struct platform_device *pdev)
{
if (tegra_pmc_get_suspend_mode() == TEGRA_SUSPEND_NOT_READY)
return -EPROBE_DEFER;
/* LP2 could be disabled in device-tree */
if (tegra_pmc_get_suspend_mode() < TEGRA_SUSPEND_LP2)
tegra_cpuidle_disable_state(TEGRA_CC6);