lkml.org 
[lkml]   [2019]   [Jun]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 08/17] riscv: improve the default power off implementation
Date
Only call the SBI code if we are not running in M mode, and if we didn't
do the SBI call, or it didn't succeed call wfi in a loop to at least
save some power.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/riscv/kernel/reset.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/reset.c b/arch/riscv/kernel/reset.c
index d0fe623bfb8f..2f5ca379747e 100644
--- a/arch/riscv/kernel/reset.c
+++ b/arch/riscv/kernel/reset.c
@@ -8,8 +8,11 @@

static void default_power_off(void)
{
+#ifndef CONFIG_M_MODE
sbi_shutdown();
- while (1);
+#endif
+ while (1)
+ wait_for_interrupt();
}

void (*pm_power_off)(void) = default_power_off;
--
2.20.1
\
 
 \ /
  Last update: 2019-06-24 07:45    [W:0.223 / U:6.576 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site