linux-kernel - [PATCH v2 5/5] powerpc/powernv: Enter deepest supported idle state in offline

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Message-Id: <1412149617-3178-6-git-send-email-shreyas@linux.vnet.ibm.com>
Date:	Wed,  1 Oct 2014 13:16:57 +0530
From:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v2 5/5] powerpc/powernv: Enter deepest supported idle state in offline

Enter winkle during offline if supported, else revert to sleep or nap.

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev@...ts.ozlabs.org
Signed-off-by: Shreyas B. Prabhu <shreyas@...ux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/smp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c
index 3ad31d2..e3fc2c9 100644
--- a/arch/powerpc/platforms/powernv/smp.c
+++ b/arch/powerpc/platforms/powernv/smp.c
@@ -169,8 +169,10 @@ static void pnv_smp_cpu_kill_self(void)
 	while (!generic_check_cpu_restart(cpu)) {
 		ppc64_runlatch_off();
 
-		/* If sleep is supported, go to sleep, instead of nap */
-		if (idle_states & IDLE_USE_SLEEP)
+		/* Go to deepest supported idle state */
+		if (idle_states & IDLE_USE_WINKLE)
+			power7_winkle();
+		else if (idle_states & IDLE_USE_SLEEP)
 			power7_sleep();
 		else
 			power7_nap(1);
-- 
1.9.3

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