powernv: Clear SPRN_PSSCR when a POWER9 CPU comes online

Ensure that PSSCR is set to a safe value corresponding to no
state-loss each time a POWER9 CPU comes online.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Acked-By: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
index bdfc1c67eb38af30c34b57fe70ac85c4b65001fe..fe35ef2efc280c8deaf83ac8197139e424770950 100644 (file)
--- a/arch/powerpc/kernel/cpu_setup_power.S
+++ b/arch/powerpc/kernel/cpu_setup_power.S
@@ -96,6 +96,7 @@ _GLOBAL(__setup_cpu_power9)
        mtlr    r11
        beqlr
        li      r0,0
+       mtspr   SPRN_PSSCR,r0
        mtspr   SPRN_LPID,r0
        mfspr   r3,SPRN_LPCR
        ori     r3, r3, LPCR_PECEDH
@@ -116,6 +117,7 @@ _GLOBAL(__restore_cpu_power9)
        mtlr    r11
        beqlr
        li      r0,0
+       mtspr   SPRN_PSSCR,r0
        mtspr   SPRN_LPID,r0
        mfspr   r3,SPRN_LPCR
        ori     r3, r3, LPCR_PECEDH