linux-kernel - [PATCH v3 07/13] ARM: tegra: Add tegra_pm_park_secondary

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Message-Id: <20190715172629.4437-8-digetx@gmail.com>
Date:   Mon, 15 Jul 2019 20:26:23 +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>
Cc:     linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 07/13] ARM: tegra: Add tegra_pm_park_secondary_cpu()

This function resembles tegra_cpu_die() of the hotplug code, but
this variant is more suitable to be used for CPU PM because it's made
specifically to be used by cpu_suspend(). In short this function puts
secondary CPU offline, it will be used by the new CPUIDLE driver.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/mach-tegra/pm.c | 14 ++++++++++++++
 include/soc/tegra/pm.h   |  6 ++++++
 2 files changed, 20 insertions(+)

diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index 4cc64a135a3e..7d9ef26e52a7 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -427,4 +427,18 @@ void __init tegra_init_suspend(void)
 
 	suspend_set_ops(&tegra_suspend_ops);
 }
+
+int tegra_pm_park_secondary_cpu(unsigned long cpu)
+{
+	if (cpu > 0) {
+		tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);
+
+		if (tegra_get_chip_id() == TEGRA20)
+			tegra20_hotplug_shutdown();
+		else
+			tegra30_hotplug_shutdown();
+	}
+
+	return -EINVAL;
+}
 #endif
diff --git a/include/soc/tegra/pm.h b/include/soc/tegra/pm.h
index 2fbee9efda21..08477d7bfab9 100644
--- a/include/soc/tegra/pm.h
+++ b/include/soc/tegra/pm.h
@@ -27,6 +27,7 @@ int tegra30_pm_secondary_cpu_suspend(unsigned long arg);
 void tegra_pm_clear_cpu_in_lp2(void);
 void tegra_pm_set_cpu_in_lp2(void);
 int tegra_pm_enter_lp2(void);
+int tegra_pm_park_secondary_cpu(unsigned long cpu);
 #else
 static inline enum tegra_suspend_mode
 tegra_pm_validate_suspend_mode(enum tegra_suspend_mode mode)
@@ -55,6 +56,11 @@ static inline int tegra_pm_enter_lp2(void)
 {
 	return -ENOTSUPP;
 }
+
+static inline int tegra_pm_park_secondary_cpu(unsigned long cpu)
+{
+	return -ENOTSUPP;
+}
 #endif /* CONFIG_PM_SLEEP */
 
 #endif /* __SOC_TEGRA_PM_H__ */
-- 
2.22.0