[PATCH 5/8] memory: emif: use restart if power_off not present when out of spec
From: Lokesh Vutla <hidden>
Date: 2013-03-11 05:06:37
Also in:
linux-omap, lkml
Subsystem:
arm/texas instrument aemif/emif drivers, memory controller drivers, the rest · Maintainers:
Santosh Shilimkar, Krzysztof Kozlowski, Linus Torvalds
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 <redacted> --- 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(); + /* 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