linux-kernel - [PATCH v1 1/2] ARM: tegra: Switch CPU to PLLP before powergating on Tegra30

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Message-Id: <20180830190454.8729-2-digetx@gmail.com>
Date:   Thu, 30 Aug 2018 22:04:53 +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>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/2] ARM: tegra: Switch CPU to PLLP before powergating on Tegra30

PLLX is getting turned by the HW logic when CPU enters powergated state
and there is no enough time for PLLX to re-lock on exiting the low-power
state, this causes memory errors coming from misbehaving CPU and eventual
hanging of the system.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/mach-tegra/sleep-tegra30.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-tegra/sleep-tegra30.S b/arch/arm/mach-tegra/sleep-tegra30.S
index dd4a67dabd91..d572d4b860be 100644
--- a/arch/arm/mach-tegra/sleep-tegra30.S
+++ b/arch/arm/mach-tegra/sleep-tegra30.S
@@ -298,8 +298,8 @@ ENDPROC(tegra30_sleep_cpu_secondary_finish)
  * Switches the CPU to enter sleep.
  */
 ENTRY(tegra30_tear_down_cpu)
+	bl	tegra_switch_cpu_to_pllp
 	mov32	r6, TEGRA_FLOW_CTRL_BASE
-
 	b	tegra30_enter_sleep
 ENDPROC(tegra30_tear_down_cpu)
 
-- 
2.18.0