From 56ee52408ed0bd4af400c04ad60f9811c82e5343 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Tue, 29 Aug 2017 21:34:40 +1000 Subject: [PATCH] powerpc/64s: POWER9 can execute stop without a sync sequence We don't need to use IDLE_STATE_ENTER_SEQ_NORET on Power9. Reviewed-by: Gautham R. Shenoy Signed-off-by: Nicholas Piggin [mpe: Split out of larger patch] Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/idle_book3s.S | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index c3cc185..22e616e 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -333,7 +333,7 @@ power_enter_stop: andis. r4,r3,PSSCR_EC_ESL_MASK_SHIFTED clrldi r3,r3,60 /* r3 = Bits[60:63] = Requested Level (RL) */ bne .Lhandle_esl_ec_set - IDLE_STATE_ENTER_SEQ(PPC_STOP) + PPC_STOP li r3,0 /* Since we didn't lose state, return 0 */ /* @@ -366,7 +366,8 @@ power_enter_stop: ld r4,ADDROFF(pnv_first_deep_stop_state)(r5) cmpd r3,r4 bge .Lhandle_deep_stop - IDLE_STATE_ENTER_SEQ_NORET(PPC_STOP) + PPC_STOP /* Does not return (system reset interrupt) */ + .Lhandle_deep_stop: /* * Entering deep idle state. @@ -388,7 +389,7 @@ lwarx_loop_stop: bl save_sprs_to_stack - IDLE_STATE_ENTER_SEQ_NORET(PPC_STOP) + PPC_STOP /* Does not return (system reset interrupt) */ /* * Entered with MSR[EE]=0 and no soft-masked interrupts pending. -- 2.7.4