diff mbox

[5/8] memory: emif: use restart if power_off not present when out of spec

Message ID 1362978365-5593-6-git-send-email-lokeshvutla@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Lokesh Vutla March 11, 2013, 5:06 a.m. UTC
From: Nishanth Menon <nm@ti.com>

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>
---
 drivers/memory/emif.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Comments

Santosh Shilimkar March 11, 2013, 5:39 a.m. UTC | #1
On Monday 11 March 2013 10:36 AM, Lokesh Vutla wrote:
> From: Nishanth Menon <nm@ti.com>
> 
> 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>
> ---
>  drivers/memory/emif.c |    9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c
> index 927fb55..02a94fc 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"
> @@ -1011,7 +1012,13 @@ 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();
Extra line here would be good here.
> +		/* 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;
>  	}
>  
Otherwise,
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>

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diff mbox

Patch

diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c
index 927fb55..02a94fc 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"
@@ -1011,7 +1012,13 @@  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;
 	}