Commit 2b0a438d authored by Paul Mackerras's avatar Paul Mackerras Committed by Madhavan Srinivasan
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powerpc/microwatt: Define an idle power-save function 



This uses the 'wait' instruction to pause instruction execution when
idle until an interrupt occurs.

Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
Signed-off-by: default avatarMadhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/Z5xtl1m_Gqc-HLjY@thinks.paulus.ozlabs.org
parent 78099fe1

arch/powerpc/platforms/microwatt/setup.c

+9 −0
Original line number Diff line number Diff line
@@ -34,10 +34,19 @@ static void __init microwatt_setup_arch(void) 
	microwatt_rng_init();

}



static void microwatt_idle(void)

{

	if (!prep_irq_for_idle_irqsoff())

		return;



	__asm__ __volatile__ ("wait");

}



define_machine(microwatt) {

	.name			= "microwatt",

	.compatible		= "microwatt-soc",

	.init_IRQ		= microwatt_init_IRQ,

	.setup_arch		= microwatt_setup_arch,

	.progress		= udbg_progress,

	.power_save		= microwatt_idle,

};