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authorMathieu Poirier <mathieu.poirier@linaro.org>2016-08-25 15:19:02 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-08-31 13:05:42 +0200
commitcd9e3474bb793dc93fbe0985f822ad4b2605e847 (patch)
treec26eae33b81de772287eba0fdc73bd7cd1245ba0 /drivers/hwtracing
parent62d39ac934daaaecc716d651809b18da8ac255b0 (diff)
downloadlinux-cd9e3474bb793dc93fbe0985f822ad4b2605e847.tar.bz2
coresight: add PM runtime calls to coresight_simple_func()
It is mandatory to enable a coresight block's power domain before trying to access management registers. Otherwise the transaction simply stalls, leading to a system hang. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-priv.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index ad975c58080d..decfd52b5dc3 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -16,6 +16,7 @@
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/coresight.h>
+#include <linux/pm_runtime.h>
/*
* Coresight management registers (0xf00-0xfcc)
@@ -42,8 +43,11 @@ static ssize_t name##_show(struct device *_dev, \
struct device_attribute *attr, char *buf) \
{ \
type *drvdata = dev_get_drvdata(_dev->parent); \
- return scnprintf(buf, PAGE_SIZE, "0x%x\n", \
- readl_relaxed(drvdata->base + offset)); \
+ u32 val; \
+ pm_runtime_get_sync(_dev->parent); \
+ val = readl_relaxed(drvdata->base + offset); \
+ pm_runtime_put_sync(_dev->parent); \
+ return scnprintf(buf, PAGE_SIZE, "0x%x\n", val); \
} \
static DEVICE_ATTR_RO(name)