linux-kernel - [PATCH AUTOSEL 5.14 47/75] cpuidle: tegra: Check whether PMC is ready

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Message-Id: <20211109221905.1234094-47-sashal@kernel.org>
Date:   Tue,  9 Nov 2021 17:18:37 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dmitry Osipenko <digetx@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thierry Reding <treding@...dia.com>,
        Sasha Levin <sashal@...nel.org>, rjw@...ysocki.net,
        swarren@...dotorg.org, thierry.reding@...il.com, gnurou@...il.com,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: [PATCH AUTOSEL 5.14 47/75] cpuidle: tegra: Check whether PMC is ready

From: Dmitry Osipenko <digetx@...il.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@...aro.org>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.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