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 8ba6bd769280f771f0f817c2776885e5446b7e8c, "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>

diff --git a/arch/sparc/kernel/leon_pmc.c b/arch/sparc/kernel/leon_pmc.c
index bdf53d9a8d460041e9237ebbfd219bb180879a86..b0b3967a2dd2d1e6ca46571d635a43b02e38fa75 100644 (file)
--- 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");
 }