| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.14 47/75] cpuidle: tegra: Check whether PMC is ready | Date | Tue, 9 Nov 2021 17:18:37 -0500 |
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From: Dmitry Osipenko <digetx@gmail.com>
[ Upstream commit bdb1ffdad3b73e4d0538098fc02e2ea87a6b27cd ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/cpuidle/cpuidle-tegra.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c index 508bd9f237929..9845629aeb6d4 100644 --- a/drivers/cpuidle/cpuidle-tegra.c +++ b/drivers/cpuidle/cpuidle-tegra.c @@ -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); -- 2.33.0
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