* [PATCH] powerpc/64s/idle: POWER9 restore AMOR after deep sleep
@ 2018-04-05 6:10 Nicholas Piggin
2018-04-05 14:42 ` Michael Ellerman
0 siblings, 1 reply; 2+ messages in thread
From: Nicholas Piggin @ 2018-04-05 6:10 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Nicholas Piggin, Vaidyanathan Srinivasan
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.
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
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(+)
diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S
index bc4e391d031e..e72e385a4973 100644
--- a/arch/powerpc/kernel/idle_book3s.S
+++ b/arch/powerpc/kernel/idle_book3s.S
@@ -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
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2018-04-05 6:10 [PATCH] powerpc/64s/idle: POWER9 restore AMOR after deep sleep Nicholas Piggin
2018-04-05 14:42 ` Michael Ellerman
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