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powerpc/powernv/idle: Fix restore of SPRN_LDBAR for POWER9 stop state. 

commit 10d91611f4 ("powerpc/64s: Reimplement book3s idle code in C")
reimplemented book3S code to pltform/powernv/idle.c. But when doing so
missed to add the per-thread LDBAR update in the core_woken path of
the power9_idle_stop(). Patch fixes the same.

Fixes: 10d91611f4 ("powerpc/64s: Reimplement book3s idle code in C")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190702105836.26695-1-maddy@linux.vnet.ibm.com
This commit is contained in:
Athira Rajeev 2019-07-02 16:28:36 +05:30 committed by Michael Ellerman
parent 3343962068
commit f5a9e488d6
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/platforms/powernv/idle.c
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@ -762,7 +762,6 @@ static unsigned long power9_idle_stop(unsigned long psscr, bool mmu_on)
mtspr(SPRN_PTCR, sprs.ptcr);
mtspr(SPRN_RPR, sprs.rpr);
mtspr(SPRN_TSCR, sprs.tscr);
mtspr(SPRN_LDBAR, sprs.ldbar);
if (pls >= pnv_first_tb_loss_level) {
/* TB loss */
@ -794,6 +793,7 @@ core_woken:
mtspr(SPRN_MMCR0, sprs.mmcr0);
mtspr(SPRN_MMCR1, sprs.mmcr1);
mtspr(SPRN_MMCR2, sprs.mmcr2);
mtspr(SPRN_LDBAR, sprs.ldbar);
mtspr(SPRN_SPRG3, local_paca->sprg_vdso);