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[PATCH 14/22] openrisc: Initial support for the idle state

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From: Sebastian Macke <sebastian@macke.de>

This patch adds basic support for the idle state of the cpu.
The patch overrides the regular idle function, enables the interupts,
checks for the power management unit and enables the cpu doze mode
if available.

Signed-off-by: Sebastian Macke <sebastian@macke.de>
[shorne@gmail.com: Fixed checkpatch, blankline after declarations]
Signed-off-by: Stafford Horne <shorne@gmail.com>
---
 arch/openrisc/kernel/process.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c
index c49350b..ffde77f 100644
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -75,6 +75,20 @@ void machine_power_off(void)
 	__asm__("l.nop 1");
 }
 
+/*
+ * Send the doze signal to the cpu if available.
+ * Make sure, that all interrupts are enabled
+ */
+void arch_cpu_idle(void)
+{
+	unsigned long upr;
+
+	local_irq_enable();
+	upr = mfspr(SPR_UPR);
+	if (upr & SPR_UPR_PMP)
+		mtspr(SPR_PMR, mfspr(SPR_PMR) | SPR_PMR_DME);
+}
+
 void (*pm_power_off) (void) = machine_power_off;
 
 /*
-- 
2.9.3

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[PATCH 00/22] Openrisc patchees from backlog for 4.11 Stafford Horne <shorne@gmail.com> - 2017-01-15 00:10 +0100
  [PATCH 19/22] scripts/checkstack.pl: Add openrisc support Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 16/22] openrisc: Add optimized memcpy routine Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 12/22] openrisc: remove unnecessary stddef.h include Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 21/22] openrisc: entry: Fix delay slot detection Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 14/22] openrisc: Initial support for the idle state Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 15/22] openrisc: Add optimized memset Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 10/22] openrisc: add spinlock implementation Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 11/22] openrisc: add futex_atomic_* implementations Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 03/22] openrisc: tlb miss handler optimizations Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 17/22] openrisc: Add .gitignore Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 13/22] openrisc: Fix the bitmask for the unit present register Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 22/22] openrisc: head: Move init strings to rodata section Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 07/22] openrisc: add atomic bitops Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
    Re: [PATCH 07/22] openrisc: add atomic bitops kbuild test robot <lkp@intel.com> - 2017-01-15 06:40 +0100
      Re: [PATCH 07/22] openrisc: add atomic bitops Stafford Horne <shorne@gmail.com> - 2017-01-15 09:30 +0100
  [PATCH 09/22] openrisc: add optimized atomic operations Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 18/22] MAINTAINERS: Add the openrisc official repository Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  [PATCH 20/22] openrisc: entry: Whitespace and comment cleanups Stafford Horne <shorne@gmail.com> - 2017-01-15 00:20 +0100
  Re: [PATCH 00/22] Openrisc patchees from backlog for 4.11 Guenter Roeck <linux@roeck-us.net> - 2017-01-15 06:20 +0100
    Re: [PATCH 00/22] Openrisc patchees from backlog for 4.11 Stafford Horne <shorne@gmail.com> - 2017-01-15 09:40 +0100
    Re: [PATCH 00/22] Openrisc patchees from backlog for 4.11 Stafford Horne <shorne@gmail.com> - 2017-01-16 13:00 +0100

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