Re: [PATCH] powernv: Properly mask POWER9 DD1 PVR for different chip types
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2017-06-07 07:24:42
Michael Neuling [off-list ref] writes:
Bits 48:51 in the PVR for POWER9 represent different chip types (scale up vs out and 12 vs 24 core). Current chips have 0 here, but could be non-zero in the future. This changes the POWER9 DD1 mask to correctly ignore these bits 48:51. Signed-off-by: Michael Neuling <redacted> --- arch/powerpc/kernel/cputable.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
Presumably we should backport this? cheers
quoted hunk ↗ jump to hunk
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c index 9b3e88b1a9..89dcd94237 100644 --- a/arch/powerpc/kernel/cputable.c +++ b/arch/powerpc/kernel/cputable.c@@ -526,8 +526,8 @@ static struct cpu_spec __initdata cpu_specs[] = { .machine_check_early = __machine_check_early_realmode_p8, .platform = "power8", }, - { /* Power9 DD1*/ - .pvr_mask = 0xffffff00, + { /* Power9 DD1. Bits 48:51 represent chip type so mask these */ + .pvr_mask = 0xffff0f00, .pvr_value = 0x004e0100, .cpu_name = "POWER9 (raw)", .cpu_features = CPU_FTRS_POWER9_DD1,-- 2.11.0