linux-kernel - [PATCH v9 04/17] ARM: tegra: Change tegra_set_cpu_in

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Message-Id: <20200212235134.12638-5-digetx@gmail.com>
Date:   Thu, 13 Feb 2020 02:51:21 +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>
Cc:     linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v9 04/17] ARM: tegra: Change tegra_set_cpu_in_lp2() type to void

The Tegra30 CPUIDLE driver has intention to check whether primary CPU was
the last CPU that entered LP2 (CC6) idle-state, but that functionality
never got utilized because driver never supported the CC6 state for the
case where any secondary CPU is online. The new cpuidle driver will
properly support CC6 on Tegra30, including the case where secondary CPUs
are online, and that knowledge about what CPUs entered into CC6 won't be
needed at all because new driver will use different approach by making use
of the coupled idle-state and explicitly parking secondary CPUs before
entering into CC6. Thus this patch is just a minor cleanup change.

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>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/mach-tegra/cpuidle-tegra30.c | 14 ++++----------
 arch/arm/mach-tegra/pm.c              |  8 +-------
 arch/arm/mach-tegra/pm.h              |  2 +-
 3 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/arch/arm/mach-tegra/cpuidle-tegra30.c b/arch/arm/mach-tegra/cpuidle-tegra30.c
index c6128526877d..a3ce8dabfe18 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra30.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra30.c
@@ -98,22 +98,16 @@ static int tegra30_idle_lp2(struct cpuidle_device *dev,
 			    int index)
 {
 	bool entered_lp2 = false;
-	bool last_cpu;
 
 	local_fiq_disable();
 
-	last_cpu = tegra_set_cpu_in_lp2();
+	tegra_set_cpu_in_lp2();
 	cpu_pm_enter();
 
-	if (dev->cpu == 0) {
-		if (last_cpu)
-			entered_lp2 = tegra30_cpu_cluster_power_down(dev, drv,
-								     index);
-		else
-			cpu_do_idle();
-	} else {
+	if (dev->cpu == 0)
+		entered_lp2 = tegra30_cpu_cluster_power_down(dev, drv, index);
+	else
 		entered_lp2 = tegra30_cpu_core_power_down(dev, drv, index);
-	}
 
 	cpu_pm_exit();
 	tegra_clear_cpu_in_lp2();
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index 1ff499068bb1..a72f9a2d3cb7 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -123,11 +123,9 @@ void tegra_clear_cpu_in_lp2(void)
 	spin_unlock(&tegra_lp2_lock);
 }
 
-bool tegra_set_cpu_in_lp2(void)
+void tegra_set_cpu_in_lp2(void)
 {
 	int phy_cpu_id = cpu_logical_map(smp_processor_id());
-	bool last_cpu = false;
-	cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask;
 	u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;
 
 	spin_lock(&tegra_lp2_lock);
@@ -135,11 +133,7 @@ bool tegra_set_cpu_in_lp2(void)
 	BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id)));
 	*cpu_in_lp2 |= BIT(phy_cpu_id);
 
-	if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask))
-		last_cpu = true;
-
 	spin_unlock(&tegra_lp2_lock);
-	return last_cpu;
 }
 
 static int tegra_sleep_cpu(unsigned long v2p)
diff --git a/arch/arm/mach-tegra/pm.h b/arch/arm/mach-tegra/pm.h
index b9cc12222bb1..2c294f6365c0 100644
--- a/arch/arm/mach-tegra/pm.h
+++ b/arch/arm/mach-tegra/pm.h
@@ -24,7 +24,7 @@ void tegra30_lp1_iram_hook(void);
 void tegra30_sleep_core_init(void);
 
 void tegra_clear_cpu_in_lp2(void);
-bool tegra_set_cpu_in_lp2(void);
+void tegra_set_cpu_in_lp2(void);
 void tegra_idle_lp2_last(void);
 extern void (*tegra_tear_down_cpu)(void);
 
-- 
2.24.0