linux-kernel - [PATCH v11 05/17] ARM: tegra: Propagate error from tegra_idle_lp2

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Date:   Tue, 25 Feb 2020 01:40:45 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Jasper Korten <jja2000@...il.com>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>
Cc:     linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v11 05/17] ARM: tegra: Propagate error from tegra_idle_lp2_last()

Technically cpu_suspend() may fail and it's never good to lose information
about failure. For example things like cpuidle core could correctly sample
idling time in the case of failure.

Acked-by: Peter De Schrijver <pdeschrijver@...dia.com>
Tested-by: Peter Geis <pgwipeout@...il.com>
Tested-by: Jasper Korten <jja2000@...il.com>
Tested-by: David Heidelberg <david@...t.cz>
Tested-by: Nicolas Chauvet <kwizart@...il.com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/mach-tegra/cpuidle-tegra20.c | 6 ++++--
 arch/arm/mach-tegra/cpuidle-tegra30.c | 4 +---
 arch/arm/mach-tegra/pm.c              | 8 ++++++--
 arch/arm/mach-tegra/pm.h              | 2 +-
 4 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/arm/mach-tegra/cpuidle-tegra20.c b/arch/arm/mach-tegra/cpuidle-tegra20.c
index 78c20025dcfe..b3087ece9421 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra20.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra20.c
@@ -86,15 +86,17 @@ static bool tegra20_cpu_cluster_power_down(struct cpuidle_device *dev,
 					   struct cpuidle_driver *drv,
 					   int index)
 {
+	bool ret;
+
 	while (!tegra_cpu_rail_off_ready())
 		cpu_relax();
 
-	tegra_idle_lp2_last();
+	ret = !tegra_idle_lp2_last();
 
 	if (cpu_online(1))
 		tegra20_wake_cpu1_from_reset();
 
-	return true;
+	return ret;
 }
 
 #ifdef CONFIG_SMP
diff --git a/arch/arm/mach-tegra/cpuidle-tegra30.c b/arch/arm/mach-tegra/cpuidle-tegra30.c
index a3ce8dabfe18..17cbd118abee 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra30.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra30.c
@@ -68,9 +68,7 @@ static bool tegra30_cpu_cluster_power_down(struct cpuidle_device *dev,
 		return false;
 	}
 
-	tegra_idle_lp2_last();
-
-	return true;
+	return !tegra_idle_lp2_last();
 }
 
 #ifdef CONFIG_SMP
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index a72f9a2d3cb7..a094acaca307 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -189,14 +189,16 @@ static void tegra_pm_set(enum tegra_suspend_mode mode)
 	tegra_pmc_enter_suspend_mode(mode);
 }
 
-void tegra_idle_lp2_last(void)
+int tegra_idle_lp2_last(void)
 {
+	int err;
+
 	tegra_pm_set(TEGRA_SUSPEND_LP2);
 
 	cpu_cluster_pm_enter();
 	suspend_cpu_complex();
 
-	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
+	err = cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
 
 	/*
 	 * Resume L2 cache if it wasn't re-enabled early during resume,
@@ -208,6 +210,8 @@ void tegra_idle_lp2_last(void)
 
 	restore_cpu_complex();
 	cpu_cluster_pm_exit();
+
+	return err;
 }
 
 enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
diff --git a/arch/arm/mach-tegra/pm.h b/arch/arm/mach-tegra/pm.h
index 2c294f6365c0..7d72f31dee77 100644
--- a/arch/arm/mach-tegra/pm.h
+++ b/arch/arm/mach-tegra/pm.h
@@ -25,7 +25,7 @@ void tegra30_sleep_core_init(void);
 
 void tegra_clear_cpu_in_lp2(void);
 void tegra_set_cpu_in_lp2(void);
-void tegra_idle_lp2_last(void);
+int tegra_idle_lp2_last(void);
 extern void (*tegra_tear_down_cpu)(void);
 
 #ifdef CONFIG_PM_SLEEP
-- 
2.24.0