powerpc/64s: Fix DT CPU features Power9 DD2.1 logic

In the device tree CPU features quirk code we want to set
CPU_FTR_POWER9_DD2_1 on all Power9s that aren't DD2.0 or earlier. But
we got the logic wrong and instead set it on all CPUs that aren't
Power9 DD2.0 or earlier, ie. including Power8.

Fix it by making sure we're on a Power9. This isn't a bug in practice
because the only code that checks the feature is Power9 only to begin
with. But we'll backport it anyway to avoid confusion.

Fixes: 9e9626ed3a4a ("powerpc/64s: Fix POWER9 DD2.2 and above in DT CPU features")
Cc: stable@vger.kernel.org # v4.17+
Reported-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 4be1c0de9406b159eede5503b3a8044645dac7fa..96dd3d871986428dadcbc9bb350c1b876fde8ab4 100644 (file)
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -711,7 +711,8 @@ static __init void cpufeatures_cpu_quirks(void)
                cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_HV_ASSIST;
                cur_cpu_spec->cpu_features |= CPU_FTR_P9_TM_XER_SO_BUG;
                cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
-       } else /* DD2.1 and up have DD2_1 */
+       } else if ((version & 0xffff0000) == 0x004e0000)
+               /* DD2.1 and up have DD2_1 */
                cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
 
        if ((version & 0xffff0000) == 0x004e0000) {