From: Pratik Rajesh Sampat Date: Wed, 26 Aug 2020 08:29:18 +0000 (+0530) Subject: Revert "powerpc/powernv/idle: Replace CPU feature check with PVR check" X-Git-Tag: v5.15~2993^2~1 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=16d83a540ca4e7f1ebb2b3756869b77451d31414;p=mirror_ubuntu-kernels.git Revert "powerpc/powernv/idle: Replace CPU feature check with PVR check" 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 8747bf36f312356f8a295a0c39ff092d65ce75ae. Fixes: 8747bf36f312 ("powerpc/powernv/idle: Replace CPU feature check with PVR check") Signed-off-by: Pratik Rajesh Sampat Reviewed-by: Vaidyanathan Srinivasan Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200826082918.89306-1-psampat@linux.ibm.com --- diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c index 77513a80cef9..345ab062b21a 100644 --- a/arch/powerpc/platforms/powernv/idle.c +++ b/arch/powerpc/platforms/powernv/idle.c @@ -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++)