[PATCH 3/5] powerpc/microwatt: Define an idle power-save function
From: Paul Mackerras <hidden>
Date: 2025-01-28 22:58:15
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
This uses the 'wait' instruction to pause instruction execution when idle until an interrupt occurs. Signed-off-by: Paul Mackerras <redacted> --- arch/powerpc/platforms/microwatt/setup.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/platforms/microwatt/setup.c b/arch/powerpc/platforms/microwatt/setup.c
index 5e1c0997170d..97828a99780d 100644
--- a/arch/powerpc/platforms/microwatt/setup.c
+++ b/arch/powerpc/platforms/microwatt/setup.c@@ -34,10 +34,19 @@ static void __init microwatt_setup_arch(void) microwatt_rng_init(); } +static void microwatt_idle(void) +{ + if (!prep_irq_for_idle()) + 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, };
--
2.47.1