linux-kernel - [PATCH v4 1/3] powerpc/powernv/idle: Replace CPU features check with PVR check

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Date:   Tue, 21 Jul 2020 21:07:06 +0530
From:   Pratik Rajesh Sampat <psampat@...ux.ibm.com>
To:     mpe@...erman.id.au, npiggin@...il.com, benh@...nel.crashing.org,
        paulus@...ba.org, mikey@...ling.org, ego@...ux.vnet.ibm.com,
        svaidy@...ux.ibm.com, psampat@...ux.ibm.com,
        pratik.r.sampat@...il.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/3] powerpc/powernv/idle: Replace CPU features check with PVR check

As the idle framework's architecture is incomplete, hence instead of
checking for just the processor type advertised in the device tree CPU
features; check for the Processor Version Register (PVR) so that finer
granularity can be leveraged while making processor checks.

Hence, making the PVR check on the outer level function, subsequently in
the hierarchy keeping the CPU_FTR_ARCH_300 check intact as it is a
faster check to do because of static branches

Signed-off-by: Pratik Rajesh Sampat <psampat@...ux.ibm.com>
---
 arch/powerpc/platforms/powernv/idle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
index 2dd467383a88..642abf0b8329 100644
--- a/arch/powerpc/platforms/powernv/idle.c
+++ b/arch/powerpc/platforms/powernv/idle.c
@@ -1205,7 +1205,7 @@ static void __init pnv_probe_idle_states(void)
 		return;
 	}
 
-	if (cpu_has_feature(CPU_FTR_ARCH_300))
+	if (pvr_version_is(PVR_POWER9))
 		pnv_power9_idle_init();
 
 	for (i = 0; i < nr_pnv_idle_states; i++)
-- 
2.25.4