powerpc/64s/idle: POWER9 restore AMOR after deep sleep

POWER8 restores AMOR when waking from deep sleep, but POWER9 does not, because it does not go through the subcore restore.

Have POWER9 restore it in core restore.

---

Do we need this guy after waking from deep sleep?

This code is a little messy at the moment, it can be a bit tricky to see exactly what we've restored. I'm doing a bit of work to tidy it up and make it clearer, but that's not going to make 4.17 or backports.

 arch/powerpc/kernel/idle_book3s.S | 2 ++
 1 file changed, 2 insertions(+)

index bc4e391d031e..e72e385a4973 100644
@@ -857,6 +857,8 @@ BEGIN_FTR_SECTION
 	mtspr	SPRN_PTCR,r4
 	ld	r4,_RPR(r1)
 	mtspr	SPRN_RPR,r4
+	ld	r4,_AMOR(r1)
+	mtspr	SPRN_AMOR,r4
 END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
 
 	ld	r4,_TSCR(r1)

2.16.3

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c1b25a17d24925b0961c319cfc3fd7

cheers