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authorNishanth Menon <nm@ti.com>2013-03-16 10:16:45 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-26 00:18:12 +0400
commit2553e32ae200210801dd3e3f58dd23169356c9d6 (patch)
treeb84915101262d218200e7af99e61f8a61a8d9bc8 /drivers/memory
parentf91a595d0b813c3a2f3b848c165e865ca4c5b8cc (diff)
downloadlinux-2553e32ae200210801dd3e3f58dd23169356c9d6.tar.xz
memory: emif: use restart if power_off not present when out of spec
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 <nm@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/memory')
-rw-r--r--drivers/memory/emif.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c
index 96add5b9ce5d..b2bb27261c73 100644
--- a/drivers/memory/emif.c
+++ b/drivers/memory/emif.c
@@ -25,6 +25,7 @@
#include <linux/module.h>
#include <linux/list.h>
#include <linux/spinlock.h>
+#include <linux/pm.h>
#include <memory/jedec_ddr.h>
#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;
}