linux-kernel - [PATCH v2 4/6] cpuidle: tegra: Support CPU cluster power-down on Tegra30

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 11 Jul 2019 06:13:10 +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 v2 4/6] cpuidle: tegra: Support CPU cluster power-down on Tegra30

The new CPU Idle driver has all necessary features in order to allow
the deepest idling state on Tegra30 SoC where the whole CPU cluster is
power-gated using the coupled idle state.

Note that outer_disable() now need to be invoked directly since it
produces erroneous warning message about secondary CPUs being online
because it doesn't know that secondaries are turned off at that point
by the cpuidle driver.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/mach-tegra/pm.c        | 4 ++--
 drivers/cpuidle/cpuidle-tegra.c | 1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index f9c9bce9e15d..cc941b0c97e8 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -146,8 +146,8 @@ static int tegra_sleep_cpu(unsigned long v2p)
 	 * if any of secondary CPU's is online and this is the LP2-idle
 	 * code-path only for Tegra20/30.
 	 */
-	if (trusted_foundations_registered())
-		outer_disable();
+	if (trusted_foundations_registered() && outer_cache.disable)
+		outer_cache.disable();
 
 	/*
 	 * Note that besides of setting up CPU reset vector this firmware
diff --git a/drivers/cpuidle/cpuidle-tegra.c b/drivers/cpuidle/cpuidle-tegra.c
index 54974cd2255f..1412c4b0f6ee 100644
--- a/drivers/cpuidle/cpuidle-tegra.c
+++ b/drivers/cpuidle/cpuidle-tegra.c
@@ -278,7 +278,6 @@ static int tegra_cpuidle_probe(struct platform_device *pdev)
 		tegra_idle_driver.states[TEGRA_C7].disabled = true;
 		break;
 	case TEGRA30:
-		tegra_idle_driver.states[TEGRA_CC6].disabled = true;
 		break;
 	case TEGRA114:
 	case TEGRA124:
-- 
2.22.0