diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/idle_book3s.S | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S index f6518c768d2a..5adb390e773b 100644 --- a/arch/powerpc/kernel/idle_book3s.S +++ b/arch/powerpc/kernel/idle_book3s.S @@ -256,6 +256,19 @@ power_enter_stop: bne .Lhandle_esl_ec_set IDLE_STATE_ENTER_SEQ(PPC_STOP) li r3,0 /* Since we didn't lose state, return 0 */ + + /* + * pnv_wakeup_noloss() expects r12 to contain the SRR1 value so + * it can determine if the wakeup reason is an HMI in + * CHECK_HMI_INTERRUPT. + * + * However, when we wakeup with ESL=0, SRR1 will not contain the wakeup + * reason, so there is no point setting r12 to SRR1. + * + * Further, we clear r12 here, so that we don't accidentally enter the + * HMI in pnv_wakeup_noloss() if the value of r12[42:45] == WAKE_HMI. + */ + li r12, 0 b pnv_wakeup_noloss .Lhandle_esl_ec_set: |