mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-20 01:20:54 +00:00
Code Issues Releases Wiki Activity

Revert "powerpc/powernv/idle: Replace CPU feature check with PVR check"

Browse source 
cpuidle stop state implementation has minor optimizations for P10
where hardware preserves more SPR registers compared to P9. The
current P9 driver works for P10, although does few extra
save-restores. P9 driver can provide the required power management
features like SMT thread folding and core level power savings on a P10
platform.

Until the P10 stop driver is available, revert the commit which allows
for only P9 systems to utilize cpuidle and blocks all idle stop states
for P10. CPU idle states are enabled and tested on the P10 platform
with this fix.

This reverts commit 8747bf36f3.

Fixes: 8747bf36f3 ("powerpc/powernv/idle: Replace CPU feature check with PVR check")
Signed-off-by: Pratik Rajesh Sampat <psampat@linux.ibm.com>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200826082918.89306-1-psampat@linux.ibm.com
This commit is contained in:
Pratik Rajesh Sampat 2020-08-26 13:59:18 +05:30 committed by Michael Ellerman
parent 82715a0f33
commit 16d83a540c
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/powerpc/platforms/powernv/idle.c
View file

@ -1223,7 +1223,7 @@ static void __init pnv_probe_idle_states(void)
return;
}
if (pvr_version_is(PVR_POWER9))
if (cpu_has_feature(CPU_FTR_ARCH_300))
pnv_power9_idle_init();
for (i = 0; i < nr_pnv_idle_states; i++)