From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755381Ab3CPGSL (ORCPT ); Sat, 16 Mar 2013 02:18:11 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:55616 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753379Ab3CPGRJ (ORCPT ); Sat, 16 Mar 2013 02:17:09 -0400 From: Lokesh Vutla To: CC: , , , , , Nishanth Menon Subject: [PATCH V2 5/8] memory: emif: use restart if power_off not present when out of spec Date: Sat, 16 Mar 2013 11:46:45 +0530 Message-ID: <1363414608-7448-6-git-send-email-lokeshvutla@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1363414608-7448-1-git-send-email-lokeshvutla@ti.com> References: <1363414608-7448-1-git-send-email-lokeshvutla@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nishanth Menon Some machine or kernel variants might have missed implementation of power off handlers. We DONOT want to let the system be in "out of spec" state in this condition. So, WARN and attempt a machine restart in the hopes of clearing the out-of-spec temperature condition. NOTE: This is not the safest option, but safer than leaving the system in unstable conditions. Signed-off-by: Nishanth Menon Signed-off-by: Lokesh Vutla Acked-by: Santosh Shilimkar --- Changes since V1: Added a new extra line before if condition. drivers/memory/emif.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c index 827eb3b..8db74e4 100644 --- a/drivers/memory/emif.c +++ b/drivers/memory/emif.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include "emif.h" #include "of_memory.h" @@ -1015,7 +1016,14 @@ static irqreturn_t emif_threaded_isr(int irq, void *dev_id) if (emif->temperature_level == SDRAM_TEMP_VERY_HIGH_SHUTDOWN) { dev_emerg(emif->dev, "SDRAM temperature exceeds operating limit.. Needs shut down!!!\n"); - kernel_power_off(); + + /* If we have Power OFF ability, use it, else try restarting */ + if (pm_power_off) { + kernel_power_off(); + } else { + WARN(1, "FIXME: NO pm_power_off!!! trying restart\n"); + kernel_restart("SDRAM Over-temp Emergency restart"); + } return IRQ_HANDLED; } -- 1.7.9.5