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authorAndreas Larsson <andreas@gaisler.com>2013-06-10 08:56:41 +0200
committerDavid S. Miller <davem@davemloft.net>2013-06-19 02:10:29 -0700
commitd72ee6be58b7c99a6e8da6584106c5958dae2bf8 (patch)
tree5d7e6e61607d8532bd41c4255528ba451fa9d7f1 /arch
parent1ffbc51a0d00e52983c70aa7c8dbc7b621d6287d (diff)
downloadlinux-linaro-stable-d72ee6be58b7c99a6e8da6584106c5958dae2bf8.tar.gz
sparc32, leon: Enable interrupts before going idle to avoid getting stuck
This enables interrupts for Leon before having the CPU enter power-down mode. Commit 87fa05aeb3a5e8e21b1a5510eef6983650eff092, "sparc: Use generic idle loop", gets the CPU stuck on idle for Leon systems. On Leon, disabling interrupts and powering down the processor will get the processor stuck waiting for an interrupt that will never be reacted to. Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc/kernel/leon_pmc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/sparc/kernel/leon_pmc.c b/arch/sparc/kernel/leon_pmc.c
index bdf53d9a8d46..b0b3967a2dd2 100644
--- a/arch/sparc/kernel/leon_pmc.c
+++ b/arch/sparc/kernel/leon_pmc.c
@@ -47,6 +47,10 @@ void pmc_leon_idle_fixup(void)
* MMU does not get a TLB miss here by using the MMU BYPASS ASI.
*/
register unsigned int address = (unsigned int)leon3_irqctrl_regs;
+
+ /* Interrupts need to be enabled to not hang the CPU */
+ local_irq_enable();
+
__asm__ __volatile__ (
"wr %%g0, %%asr19\n"
"lda [%0] %1, %%g0\n"
@@ -60,6 +64,9 @@ void pmc_leon_idle_fixup(void)
*/
void pmc_leon_idle(void)
{
+ /* Interrupts need to be enabled to not hang the CPU */
+ local_irq_enable();
+
/* For systems without power-down, this will be no-op */
__asm__ __volatile__ ("wr %g0, %asr19\n\t");
}