Commit c716483c authored Jul 31, 2014 by Shawn Guo Committed by Russell King Aug 02, 2014

ARM: 8122/1: smp_scu: enable SCU standby support



With SCU standby enabled, SCU CLK will be turned off when all processors
are in WFI mode.  And the clock will be turned on when any processor
leaves WFI mode.

This behavior should be preferable in terms of power efficiency of
system idle.  So let's set the SCU standby bit to enable the support in
function scu_enable().

Cortex-A9 earlier than r2p0 has no standby bit in SCU, so we need to
skip setting the bit for those.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Acked-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent f8f3d4ed

arch/arm/kernel/smp_scu.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@

		#define SCU_CTRL 0x00
		#define SCU_ENABLE (1 << 0)
		#define SCU_STANDBY_ENABLE (1 << 5)
		#define SCU_CONFIG 0x04
		#define SCU_CPU_STATUS 0x08
		#define SCU_INVALIDATE 0x0c
		@@ -55,6 +56,12 @@ void scu_enable(void __iomem *scu_base)
		return;

		scu_ctrl \|= SCU_ENABLE;

		/* Cortex-A9 earlier than r2p0 has no standby bit in SCU */
		if ((read_cpuid_id() & 0xff0ffff0) == 0x410fc090 &&
		(read_cpuid_id() & 0x00f0000f) >= 0x00200000)
		scu_ctrl \|= SCU_STANDBY_ENABLE;

		writel_relaxed(scu_ctrl, scu_base + SCU_CTRL);

		/*