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powerpc: Fix /proc/cpuinfo revision for POWER9 DD2 

The P9 PVR bits 12-15 don't indicate a revision but instead different
chip configurations.  From BookIV we have:
   Bits      Configuration
    0 :    Scale out 12 cores
    1 :    Scale out 24 cores
    2 :    Scale up  12 cores
    3 :    Scale up  24 cores

DD1 doesn't use this but DD2 does. Linux will mostly use the "Scale
out 24 core" configuration (ie. SMT4 not SMT8) which results in a PVR
of 0x004e1200. The reported revision in /proc/cpuinfo is hence
reported incorrectly as "18.0".

This patch fixes this to mask off only the relevant bits for the major
revision (ie. bits 8-11) for POWER9.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Michael Neuling 2017-06-15 11:53:16 +10:00 committed by Michael Ellerman
parent 0428491cba
commit 64ebb9a208
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/kernel/setup-common.c
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@ -335,6 +335,10 @@ static int show_cpuinfo(struct seq_file *m, void *v)
maj = ((pvr >> 8) & 0xFF) - 1;
min = pvr & 0xFF;
break;
case 0x004e: /* POWER9 bits 12-15 give chip type */
maj = (pvr >> 8) & 0x0F;
min = pvr & 0xFF;
break;
default:
maj = (pvr >> 8) & 0xFF;
min = pvr & 0xFF;