linux-kernel - [PATCH 3/9] arm: add call to CPU idle quirks handler

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Message-Id: <1435094387-20146-4-git-send-email-pawelo@king.net.pl>
Date:	Tue, 23 Jun 2015 23:19:41 +0200
From:	Paul Osmialowski <pawelo@...g.net.pl>
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Cc:	Paul Osmialowski <pawelo@...g.net.pl>,
	Yuri Tikhonov <yur@...raft.com>,
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Subject: [PATCH 3/9] arm: add call to CPU idle quirks handler

Some SoCs need additional actions to be performed after arch idle,
e.g. Kinetis requires invalidation of the I/D bus cache.

Such handler could be held in provided <mach/idle.h> header file.

Signed-off-by: Paul Osmialowski <pawelo@...g.net.pl>
---
 arch/arm/Kconfig          | 7 +++++++
 arch/arm/kernel/process.c | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 8e3a833..8ef8f8f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -98,6 +98,13 @@ config ARM_HAS_SG_CHAIN
 config NEED_SG_DMA_LENGTH
 	bool
 
+config NEED_MACH_IDLE_H
+	bool
+
+config ARM_CPU_IDLE_QUIRKS
+	bool
+	select NEED_MACH_IDLE_H
+
 config ARM_DMA_USE_IOMMU
 	bool
 	select ARM_HAS_SG_CHAIN
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index f192a2a..0033460 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -37,6 +37,10 @@
 #include <asm/tls.h>
 #include <asm/vdso.h>
 
+#ifdef CONFIG_NEED_MACH_IDLE_H
+#include <mach/idle.h>
+#endif
+
 #ifdef CONFIG_CC_STACKPROTECTOR
 #include <linux/stackprotector.h>
 unsigned long __stack_chk_guard __read_mostly;
@@ -70,6 +74,9 @@ void arch_cpu_idle(void)
 		arm_pm_idle();
 	else
 		cpu_do_idle();
+#ifdef CONFIG_ARM_CPU_IDLE_QUIRKS
+	handle_cpu_idle_quirks();
+#endif
 	local_irq_enable();
 }
 
-- 
2.3.6

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